PT0E-19411

Portable Gas Monitor
04 Series

Technical Manual(PT0-189)

Contents

Contents
1. Product Overview .........................................................................................................................................................5
1-1. Introduction ...........................................................................................................................................................5
1-2. Intended use .........................................................................................................................................................7
1-3. DANGER, WARNING, CAUTION, and NOTE .....................................................................................................8
1-4. Checking standards and explosion-proof specifications.......................................................................................9
2. Important Safety Information ..................................................................................................................................... 10
2-1. Danger information ............................................................................................................................................ 10
2-2. Warning information ........................................................................................................................................... 13
2-3. Caution information ............................................................................................................................................ 17
2-4. Safety information .............................................................................................................................................. 22
3. Product Configuration ............................................................................................................................................... 25
3-1. Main unit and accessories ................................................................................................................................. 25
3-2. Part names and functions .................................................................................................................................. 27
3-2-1. Main unit .................................................................................................................................................. 27
3-2-2. LCD display ............................................................................................................................................. 29
3-3. Inserting the batteries......................................................................................................................................... 30
4. Alarm Functions ........................................................................................................................................................ 34
4-1. Gas alarm types and alarm setpoints ................................................................................................................ 34
4-2. Gas alarm activation .......................................................................................................................................... 41
4-3. Fault alarm activation ......................................................................................................................................... 43
4-4. Outside operating temperature range warning .................................................................................................. 44
5. Usage Instrucions...................................................................................................................................................... 45
5-1. Usage note ......................................................................................................................................................... 45
5-2. Preparing startup................................................................................................................................................ 45
5-3. Turning on the power ......................................................................................................................................... 46
5-4. Performing air calibration ................................................................................................................................... 52
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Contents
5-5. Measuring gas concentration ............................................................................................................................. 55
5-6. Checking the gas concentration, alarm setpoints, etc. (display mode) ............................................................. 57
5-6-1. Procedure for displaying display mode ................................................................................................... 57
5-6-2. Items displayed in display mode ............................................................................................................. 58
5-7. Turning off the power ......................................................................................................................................... 63
6. User Mode Settings................................................................................................................................................... 64
6-1. User mode setting procedure ............................................................................................................................ 64
6-2. User mode setting items .................................................................................................................................... 67
6-3. Calibration expiration setting (CAL SET) ........................................................................................................... 71
6-3-1. Calibration expiration ON/OFF (CAL.RMDR) ......................................................................................... 72
6-3-2. Calibration expiration date interval (CAL.INT) ......................................................................................... 73
6-3-3. Setting operation after calibration date expires (CAL.EXPD) ................................................................. 74
6-4. Bump test expiration setting (BUMP.SET) ......................................................................................................... 76
6-4-1. Bump test setting (SETTING).................................................................................................................. 77
6-4-2. Bump test expiration ON/OFF (BP.RMDR) ............................................................................................. 81
6-4-3. Bump test expiration date interval setting (BP.INT) ................................................................................. 82
6-4-4. Setting behavior after bump test expiration (BP.EXPD) .......................................................................... 83
6-5. Alarm setpoint setting (ALARM-P) ..................................................................................................................... 85
6-5-1. Alarm setpoint setting (ALARM-P)........................................................................................................... 86
6-5-2. Resetting alarm setpoints (DEF.ALMP)................................................................................................... 93
6-6. Lunch break ON/OFF (LUNCH) ........................................................................................................................ 94
6-7. Confirmation beep setting (BEEP) ..................................................................................................................... 95
6-7-1. Beep operation setting (BEEP.SEL) ........................................................................................................ 96
6-7-2. Beep interval setting (BEEP.INT) ............................................................................................................ 97
6-8. LCD lighting time setting (BL TIME) ................................................................................................................... 98
6-9. Key operation tone ON/OFF (KEY.TONE)......................................................................................................... 99
6-10. Display mode item display ON/OFF (DISP.SET) ........................................................................................... 100
6-11. Quick calibration time setting (E-CAL) ........................................................................................................... 101
6-12. Date and time setting (DATE) ........................................................................................................................ 102
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Contents
6-13. User mode password setting (PASS-W)........................................................................................................ 103
6-14. ROM/SUM display (ROM/SUM) .................................................................................................................... 104
7. Maintenance ............................................................................................................................................................ 105
7-1. Maintenance intervals and maintenance items ............................................................................................... 105
7-2. Performing calibration ...................................................................................................................................... 107
7-2-1. Preparation for calibration ..................................................................................................................... 107
7-2-2. Displaying the calibration (GAS CAL) screen ........................................................................................ 119
7-2-3. Performing air calibration....................................................................................................................... 120
7-2-4. Performing AUTO calibration................................................................................................................. 123
7-3. Performing bump tests ..................................................................................................................................... 132
7-4. Performing alarm tests ..................................................................................................................................... 138
7-5. Cleaning instructions ........................................................................................................................................ 140
7-6. Parts replacement ............................................................................................................................................ 141
7-6-1. Periodic replacement parts.................................................................................................................... 141
7-6-2. Filter replacement .................................................................................................................................. 143
7-6-3. Sensor replacement .............................................................................................................................. 149
8. Storage and Disposal .............................................................................................................................................. 152
8-1. Procedures for storage or when not in use for extended periods .................................................................... 152
8-2. Product disposal............................................................................................................................................... 153
9. Troubleshooting ....................................................................................................................................................... 154
9-1. Product abnormalities ...................................................................................................................................... 154
10. Product Specifications ............................................................................................................................................. 157
10-1. Common specifications .................................................................................................................................. 157
10-2. Specifications by model ................................................................................................................................. 159
11. Appendix ................................................................................................................................................................. 163
11-1. Data logger function ....................................................................................................................................... 163
11-2. Terminology .................................................................................................................................................... 166
11-3. Limited Warranty and Limitation Liability ........................................................................................................ 167

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1. Product Overview

1-1. Introduction

1

Product Overview
1-1. Introduction
Thank you for your purchase of the 04 Series Portable Gas Monitor (“product” hereinafter).
This technical manual describes product operating procedures and specifications. It provides information essential tocorrect use of the product.
Make sure you have read and fully understood the contents of this manual before using the product.
Keep this technical manual on hand to allow ready reference during use.
The contents of this manual are subject to change without notice to allow product improvements. Any duplication or
reproduction of this manual without permission is prohibited, whether in whole or in part.
Riken Keiki accepts no liability for accidents or damage resulting from use of the product, whether within or outside thewarranty period.
Review the warranty policy indicated on the warranty.

<Checks made after purchase>

Before using the product, please confirm that the model of the product you purchased matches the model of the productcovered by this technical manual.

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1. Product Overview

1-1. Introduction

Models covered by this technical manual OX-04G ・ OX-04G ・ OX-04 ・ CO-04 ・ HS-04 ・ CO-04 (C-) ・ CX-04
 SC-04 (SO2, NO2, HCN, PH3, NH3, CL2)<This technical manual>In this technical manual, where descriptions differ according to the model, the following icons are used to indicate eachof the models:
OX-04GOX G

SC-04 (SO2)

SO2

OX-04

OX

SC-04 (NO2)

NO2

CO-04

CO

SC-04 (HCN)

HCN

HS-04

HS

SC-04 (PH3)

PH3

CO-04 (C-)

C-

SC-04 (NH3)

NH3

CX-04

CX

SC-04 (CL2)

CL2Operating procedures and specifications for which no icons appear apply to all models.
In cases without significant differences from model to model, the display examples are taken from the CO-04 (CO)(detection target gas: CO (carbon monoxide)).
Product specifications may be abbreviated in this document as follows.
Japan Ex specification ： Japan specification
ATEX / IECEx specifications ： Export specification

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1. Product Overview

1-2. Intended use

1-2. Intended use
The product is a portable gas monitor for personal use designed to detect gases in the surrounding atmosphere.
It measures concentrations of toxic gases and oxygen in the atmosphere and issues an alarm when gas concentrations
reach preset levels, thereby alerting users to the hazards of gas poisoning and oxygen deficiency.
The detection results are not intended to assure life or safety.
The following models are available to detect various detection target gases.
Check the specifications before use to confirm the correct gases will be detected in accordance with the intended
purpose.
<List of detection target gases by model>
Model
OX-04G

Detection target gas
Oxygen (galvanic cell type)Model
SC-04 (SO2)

Detection target gas
Sulfur dioxide

OX-04

Oxygen (electrochemical type)SC-04 (NO2)

Nitrogen dioxide

CO-04

Carbon monoxide

SC-04 (HCN)

Hydrogen cyanide

HS-04

Hydrogen sulfide

SC-04 (PH3)

Phosphine

CO-04(C-)

Carbon monoxide*

SC-04 (NH3)Ammonia

CX-04

Carbon monoxide, oxygen

SC-04 (CL2)

Chlorine* The carbon monoxide sensor (ESR-A1CP) includes a correction function to reduce hydrogen interference. This function works forhydrogen concentrations up to 2,000 ppm. (However, if used in an environment exceeding 40°C for more than 15 minutes, it may beaffected by hydrogen interference and may indicate a higher carbon monoxide concentration than actual.)

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1. Product Overview

1-3. DANGER, WARNING, CAUTION, and NOTE

1-3. DANGER, WARNING, CAUTION, and NOTEThis technical manual uses the following categories to indicate potential damage/hazards if the user disregards theinformation provided and uses the product incorrectly:

DANGER

This indicates situations in which improper handling may result in
fatal or serious injury or significant property damage.

WARNING

This indicates situations in which improper handling may result inserious injury or significant property damage.

CAUTION

This indicates situations in which improper handling may result inminor injury or minor property damage.

Additionally, usage recommendations are indicated as follows:

NOTE

This indicates items that will be helpful to know when using the
product.

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1. Product Overview

1-4. Checking standards and explosion-proof specifications

1-4. Checking standards and explosion-proof specifications
The product specifications will vary depending on the specific standards and explosion-proof certification.
Check the actual product specifications before use. For CE marking models, refer to the Declaration of Conformity atthe end of this document.
For product specifications, refer to the nameplate attached to the rear of the product.

Type examination
certificate marking

Typical nameplate for models with certificate of conformity
for electrical equipment used in potentially explosive atmospheres(Japanese explosion-proof standard)

Ex mark
CE mark

Typical nameplate for ATEX/IECEx specification

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2. Important Safety Information

2-1. Danger information

2

Important Safety Information
To maintain the performance of the product and to ensure safe use, always observe the following DANGER, WARNING,
and CAUTION instructions.

2-1. Danger information
DANGER
Explosion-proofing Do not modify or alter the circuitry or configuration.
 When using the product in hazardous areas, take the following precautions to safeguard against static electricity
hazards:
・ Wear anti-static clothing and conductive shoes (anti-static work shoes).
・ When using the product indoors, stand on a conductive work floor (with a leakage resistance of 10 MΩ or less).
 Be sure to replace the batteries in a safe place.
 Use the batteries indicated on the certification plate attached to the main unit. The required explosion-proof
performance cannot be assured if batteries other than those specified are used.

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2-1. Danger information

The battery specifications are as follows:<Dry cell specifications>・ The explosion-proof class is Ex ia IIC T4 Ga.
・ The ratings are as follows:・ Japan specification:
Power source: 3 V DC (Toshiba LR03 battery × 2)
Ambient temperature: −40 °C to +60 °C
・ Export specification:
Power source: 3 V DC, 1 mA (Toshiba LR03, Duracell MN2400, or Duracell PC2400 battery × 2)
Ambient temperature: −40 °C to +60 °C
・ Does not accept rechargeable batteries.
<Rechargeable battery specifications>・ The explosion-proof class is Ex ia IIC T3 Ga.
・ The ratings are as follows:
Power source: 2.4 V DC, 1 mA (Panasonic eneloop (BK-4MCC) battery × 2)
Ambient temperature: −40 °C to +60 °C
・ Use two eneloop (BK-4MCC) (Panasonic) batteries. Does not accept dry cell batteries.
・ Use a BQ-CC23 (Panasonic, −Delta Vt control recharging) recharger.
・ The rating for recharging is 1.5 V DC, 550 mA.
・ Recharge the batteries only in nonhazardous locations.
 If the product is used as an explosion-proof device, note that the explosion-proofing rating conditions specify thebattery type to be used.
The battery types are as follows:<Dry cell specifications>・ Japan specification:
Power source: 3 V DC, 1 mA (Toshiba LR03 battery × 2)
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2-1. Danger information

・ Export specification:
Power source: 3 V DC, 1 mA (Toshiba LR03, Duracell MN2400, or Duracell PC2400 battery × 2)
<Rechargeable battery specifications>eneloop (BK-4MCC) (Panasonic) rechargeable battery × 2
 Guidelines<Export spec. (IECEx)><Export spec. (ATEX)> <Japan spec. (JPEx)>
・ IEC 60079-0:2017
・ EN IEC60079-0:2018 ・ JNIOSH-TR-46-1:2015
・ IEC 60079-11:2011
・ EN60079-11:2012
・ JNIOSH-TR-46-6:2015

DANGER OX G

OX

CX

Usage
 When measuring inside manholes or enclosed spaces, never lean over or look into the manhole or enclosed
space.
Such locations may generate and discharge oxygen-deficient air or other gases.

12 / 1682. Important Safety Information

2-2. Warning information

2-2. Warning information
WARNING
Air calibration in the atmosphere When air calibration is performed in the atmosphere, check the atmosphere for freshness before starting.
The presence of interference gases will prevent proper air calibration. The presence of interference gases is also
extremely dangerous because the product may not detect actual gas leaks correctly.
Battery level check Check battery levels before using the product. The batteries may become depleted if not used for extended
periods.
Always replace with new batteries before use.
The battery types are as follows:<Dry cell specifications>・ Japan specification:
Power source: 3 V DC, 1 mA (Toshiba LR03 battery × 2)
・ Export specification:
Power source: 3 V DC, 1 mA (Toshiba LR03, Duracell MN2400, or Duracell PC2400 battery × 2)
<Rechargeable battery specifications>eneloop (BK-4MCC) (Panasonic) rechargeable battery × 2
 If a low battery voltage alarm occurs, gas cannot be detected. If a low battery voltage alarm occurs during use,turn off the power and replace the batteries.
Handling the calibration gas
 The calibration gas is nitrogen and a toxic gas. Inhaling the gas may lead to loss of health or even death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.
13 / 1682. Important Safety Information

2-2. Warning information

 For calibration, use a standard gas consisting of the detection target gas diluted with nitrogen or air.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations will
result in poor sensitivity and inaccurate concentration readings.
Sensor handling Never disassemble the sensor inside the product.
Contact with the electrolyte inside the sensor may result in skin inflammation. Contact with eyes may result inblindness. Contact with clothing may result in discoloration or holes. If contact with electrolyte occurs, rinse thearea immediately with plenty of water.
 Do not use any gas other than nitrogen as the balance gas when calibrating or adjusting the oxygen sensor.
Miscellaneous Do not dispose of the product into fire.
 Do not wash the product, either in a washing machine or an ultrasonic cleaning machine.
 Do not block the buzzer sound opening. Doing so will muffle or silence the audible warning.
 Do not remove the batteries while the power is turned on.

WARNING

CX

Battery replacement, sensor replacement and filter replacement
 An OVER alarm may occur if the power is turned on within 10 minutes of replacing the batteries, the sensor andfilter replacement. This is due to the characteristics of the sensor.
If an OVER alarm occurs in fresh air after replacing the batteries, the sensor and filter replacement, turn off thepower, then turn the power on again after waiting at least 10 minutes.

14 / 1682. Important Safety Information

WARNING

2-2. Warning information

NH3

Battery replacement, sensor replacement and filter replacement
 Immediately after the power is applied, the indication may rise temporarily. This is due to the characteristics ofthe sensor. When replacing the battery or filter before the battery runs out of power, wait at least 10 minutes, andwhen replacing the sensor, replacing the battery due to a dead battery, or removing the battery and not using it
for a long time, wait at least 120 minutes before turning the power back on.

WARNING CL2Battery replacement and sensor replacement
 An OVER alarm may occur if the power is turned on within 10 minutes of replacing the batteries and the sensor
replacement. This is due to the characteristics of the sensor.
If an OVER alarm occurs in fresh air after replacing the batteries and the sensor replacement, turn off the power,
then turn the power on again after waiting at least 10 minutes.

15 / 1682. Important Safety Information

WARNING

2-2. Warning information

C-

Handling the calibration gas
 The carbon monoxide sensor with hydrogen compensation must be calibrated separately for carbon monoxideand hydrogen.
 If hydrogen sensitivity calibration is not performed, carbon monoxide readings may be inaccurate due tohydrogen interference.
 Due to the hydrogen compensation mechanism, carbon monoxide readings may increase temporarily ifhydrogen gas concentrations increase rapidly in the atmosphere being measured.

16 / 1682. Important Safety Information

2-3. Caution information

2-3. Caution information
CAUTION
Do not use the product in locations where it may be exposed to oil, chemicals, or other such substances.
Avoid deliberately submerging the product in water.
 Do not use the product in locations where it may be exposed to oil, chemicals, liquids, or other such substances.
Do not use walkie-talkies near the product.
 The product’s functions may be affected by radio waves emitted from walkie-talkies or other radio transmittersused nearby.
Position any transceivers or other similar devices so that they do not affect the product’s functions.
 Avoid using the product near devices that emit strong electromagnetic radiation (high frequency or high voltage
devices).
Be sure to perform regular maintenance.
 The product is a safety device. Maintain the product regularly to ensure safety.
Continuing to use the product without adequate maintenance will result in sensor sensitivity variations,preventing accurate gas detection.
Maintenance Replace filters every six months.
 Handle filters carefully. Do not use this product with damaged filters.
Do not use the product in locations outside the operating temperature and humidity ranges.
 The operating temperature and humidity ranges for the product are as follows. Avoid using the product attemperatures or humidity levels outside the indicated operating range.
OX-04G：<Continuous use enironment> Temperature: −20 °C to +50 °C Humidity: 10 %RH to 90 %RH
OX-04, HS-04, CO-04, CO-04 (C-), CX-04, SC-04 (SO2, NO2, PH3, CL2):<Continuous use environment> Temperature: −20 °C to +50 °C Humidity: 10 %RH to 90 %RH<Temporary use environment> Temperature: −40 °C to +60 °C Humidity: 0 %RH to 95 %RH

17 / 1682. Important Safety Information

2-3. Caution information

SC-04 (HCN)：<Continuous use environment> Temperature: −20 °C to +50 °C
Humidity: 10 %RH to 90 %RH<Temporary use environment> Temperature: −20 °C to +60 °C
Humidity: 0 %RH to 95 %RH
SC-04 (NH3)：<Continuous use environment> Temperature: −20 °C to +50 °C
Humidity: 10 %RH to 90 %RH<Temporary use environment> Temperature: −30 °C to +50 °C
Humidity: 0 %RH to 95 %RH
 Avoid using for extended periods in locations exposed to direct sunlight.
 Avoid storing the product inside parked vehicles in hot weather.
 Note that humidity may affect readings even when humidity is within the specified range.
Air calibration
 Air calibrate the product using fresh air at pressures, temperatures, and humidity levels similar to the actual
usage environment.
 Wait for the readout to stabilize before performing air calibration.
 If the temperature difference between the storage location and usage location is 15 °C or greater, turn on the
power, allow the product to adjust to ambient conditions similar to those at the usage location for about several
tens of minutes*1, and perform air calibration using fresh air before using the product.
Miscellaneous Pressing buttons unnecessarily may change settings and prevent alarms from activating correctly. Avoid
performing any operations not described in this technical manual.
 Do not drop the product or subject it to impact. Doing so may degrade waterproof and explosion-proof
performance or reduce sensitivity.
 Do not poke the sensor or buzzer sound opening with sharp or pointed items. Doing so may result in
malfunctions or damage to the product, preventing accurate measurements.
 The product is a precision device. Do not subject the product to strong impact or vibration.
 Keep the product away from magnetic fields. Magnetic fields may cause the product to fail or malfunction. If the
product does not operate correctly, use it away from magnetic fields.
Battery replacement
 Replace the batteries promptly (within 10 minutes).
If the product is stored for extended periods with the batteries removed, a [FAIL SENSOR] (sensor abnormality)

18 / 1682. Important Safety Information

2-3. Caution information

alarm may occur in rare cases when the power is turned on. If this occurs, wait several minutes*2 before turning
the power back on.
 Be sure to turn off the power for the product when replacing the batteries.
 Always replace the batteries with new batteries.
 Note the polarity when inserting the batteries. If inserted with the wrong polarity, the screen for setting date andtime will appear the next time the power is turned on.
 Do not use any batteries other than the types specified.
 Be sure to replace the batteries in a safe place.
Storage If the product will not be used for extended periods, store with the batteries removed. Battery leaks may result infire or injury.
*1 OX-04G, SC-04(NH3): 30 minutes/
OX-04, HS-04, CO-04, CO-04 (C-), CX-04, SC-04 (SO2, NO2, HCN, PH3, CL2): 10 minutes*2 OX-04G, HS-04, CO-04, CO-04 (C-), SC-04 (SO2, NO2, HCN, PH3): 5 minutes/
CX-04, SC-04(CL2): 10 minutes/SC-04(NH3): 120 minutes/OX-04: Not applicable

CAUTION

OX

CO

HS

C-

CX

SO2

NO2

HCN

PH3

NH3

CL2

Gas alarm activation
 If the sensor has been exposed to high concentrations of gas (including the detection target gas or interferencegas), it may take several minutes, or even several hours, for the display readout to return to [0 ppm] ([20.9 %] foroxygen). (For example, high concentrations of hydrogen, unsaturated hydrocarbons, alcohol, etc.)

19 / 1682. Important Safety Information

CAUTION

OX

2-3. Caution information

CX

Oxygen sensor
 Do not expose the product to sudden pressure fluctuations. Oxygen readings will fluctuate briefly, preventing
accurate measurement.
 Do not use any gas other than nitrogen as the balance gas. Otherwise, oxygen reading errors will increase,preventing accurate measurement.

CAUTIONC-

Calibration
 Calibration of hydrogen gas may become impossible when the product is used or stored for extended periods in
dry environments.
If [FAIL A-CAL] (calibration abnormality) appears during hydrogen sensitivity calibration, leave the productovernight or longer in a location with sufficient humidity, then perform calibration once again. If it is not possible toperform CO sensitivity calibration, contact Riken Keiki to request sensor replacement.

CAUTIONCX Avoid using the product continuously for extended periods (one day or longer) under a low temperatureenvironment (below −20 C) or storing it under such environment.

20 / 1682. Important Safety Information

CAUTION SO2

2-3. Caution information

NO2

Do not use the product in locations outside the operating temperature and humidity range.
 Due to the filter incorporated into this product, response to gas may slow in high humidity environments.

CAUTION NH3
 There is a possibility of temporary fluctuation of the indication in response to sudden changes in humidity*. Allow
the product to blend in sufficiently under the operating environment before turning it on again. Please reconnect
the power supply.
*e.g., entering a room from outdoors when it's raining, covering the sensor with your hand

21 / 1682. Important Safety Information

2-4. Safety information

2-4. Safety information
This product is a portable single-gas/two-gas monitor to detect gas.
This product uses two AAA alkaline batteries (Toshiba LR03 or Duracell MN2400/PC2400) or two AAA Ni-MH
batteries (Panasonic eneloop (BK-4MCC)) for power supply. Perform battery replacement only in a
non-hazardous area.

<Japanese explosion-proof specifications>
Explosion-proof Intrinsically safe explosion-proof construction
construction
Explosion-proof Ex ia IIC T4 Ga (Dry cell specifications)class
Ex ia IIC T3 Ga (Rechargeable battery specifications)Ambient-40 ℃ to +60 ℃
temperature*
RatingPower source: Toshiba LR03 battery × 2 (3 V DC, 1 mA)
ApplicableJNIOSH-TR-46-1: 2015
guidelinesJNIOSH-TR-46-6: 2015
*The ambient temperature refers to temperatures in the range within which explosion-proof performance can be
maintained. It does not imply the temperature range within which the required product performance may be achieved.
For information on the operating temperature range, refer to ‘10. Product Specifications’.

22 / 1682. Important Safety Information

2-4. Safety information<ATEX/IECEx specifications>
Explosion-proof Intrinsically safe explosion-proof construction
construction
Explosion-proof Ex ia IIC T4...T3 Ga
class
II 1 G Ex ia IIC T4...T3 Ga
Ambient-40 ℃ to +60 ℃
temperature*
Electrical
T4: Powered by two Toshiba LR03 or Duracell MN2400/PC2400 AAA series-connected alkaline
specifications
batteries (Use only Toshiba LR03 for Japan Ex specification.)
T3: Powered by two Panasonic eneloop (BK-4MCC) series-connected AAA Ni-MH batteries
Certificate
・ IECEx: IECEx DEK 19.0059
numbers
・ ATEX: DEKRA 19 ATEX 0097
Applicable・ IEC 60079-0:2017
・ EN IEC 60079-0:2018
standards
・ IEC 60079-11:2011
・ EN60079-11:2012*The ambient temperature refers to temperatures in the range within which explosion-proof performance can be
maintained. It does not imply the temperature range within which the required product performance may be achieved.
For information on the operating temperature range, refer to `10. Product Specifications'.

23 / 1682. Important Safety Information

2-4. Safety information

WARNING Do not replace batteries in hazardous locations.
 Do not attempt to disassemble or alter the product.
 Use only two series-connected AAA alkaline batteries, LR03 manufactured by Toshiba or MN2400/PC2400
by Duracell, or use two series-connected AAA Ni-MH batteries, eneloop (BK-4MCC) manufactured by
Panasonic.
・ T4: LR03 manufactured by Toshiba or MN2400/PC2400 by Duracell(Only LR03 by Toshiba can be used for Japan Ex specification.)・ T3: eneloop (BK-4MCC) manufactured by Panasonic

INST. No. 0 0 0 0 0 0 0 0 0 0 0
AB

C

D

E

A: Manufacturing year (0-9)
B: Manufacturing month (1-9, XYZ for Oct.-Dec.)
C: Manufacturing lot
D: Serial number
E: Code of factory

2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Phone:+81-3-3966-1113
Fax:+81-3-3558-9110
Email:
intdept@rikenkeiki.co.jp
Website:https://www.rikenkeiki.co.jp

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3. Product Configuration

3-1. Main unit and accessories

3

Product Configuration
3-1. Main unit and accessories
Open the box and packaging and inspect the main unit and accessories.
If anything is missing, contact Riken Keiki.

<Main unit and standard accessories>
Main unit

Standard accessories
Spring bar × 2 (fitted)
Dry cell specifications: AAA alkaline battery × 2 (fitted)
Rechargeable battery specifications:
AAA Ni-MH battery × 2 (fitted)

Rubber protection cover × 1 (fitted)

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Belt clip × 1 (fitted)
Japan specification

Technical manual × 1
Product warranty × 1
Alligator clip × 1
Export specification

3. Product Configuration

3-1. Main unit and accessories<Optional items (sold separately)> Dust filter (built-in) (Other than SC-04 (CL2))
 Spacer (SC-04 (CL2))
 Filters
HS-04, SC-04(PH3):
Humidity control filter CF-A13i-1
SC-04(NH3):
Humidity control filter CF-B134-1
CO-04, CO-04 (C-), CX-04: Interference gas removal filter CF-6280
SC-04 (NO2):
H2S removal filter CF-A13D-1
SC-04 (HCN):
H2S removal filter CF-A13D-3
SC-04 (SO2):
H2S removal filter CF-A13D-5
 Belt clip
 Alligator clip Helmet mounting clip (for carbon monoxide sensor)
 Heat-resistant case Calibration adapter
 Hand strap Band Data logger management program

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3. Product Configuration

3-2. Part names and functions

3-2. Part names and functions
3-2-1. Main unit
① Alarm lamp/
Infraredcommunication port
② Buzzer soundopening⑥ Sensor⑧ Belt clip

⑨ Batterycover③ LCD display④ AIR button⑤ POWER/MODE button⑦ Rubber protection
cover

No.

Name

Function①

Alarm lamp/Infraredcommunication port

Flashes red when an alarm occurs.
This is used for data communication with a PC when using the data logger
management program (sold separately)*.

②

Buzzer soundopening

Opening that emits operating and alarm sounds. Blocking the buzzer sound opening
will muffle or silence the audible warning.

③

LCD display

Displays the detection target gas name, gas concentration, battery level, etc.

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3. Product ConfigurationNo.

3-2. Part names and functions

Name

Function④

AIR button

Performs air calibration in measurement mode. Used to select functions when in user
mode, etc.

⑤

POWER/MODE
buttonTurns the power on/off. Confirms operations when in user mode, etc.

⑥

Sensor

The sensor for detecting gas is installed.

⑦

Rubber protection
cover

Cover protecting the product⑧Belt clip

Used when clipping to a belt⑨

Battery cover

Cover protecting the batteries* The data logger management program is sold separately. For more information, refer to the operating manual for the data logger
management program.

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3. Product Configuration

3-2. Part names and functions

3-2-2. LCD display① Gas name/concentration
display③ Operating status
display② Battery levelicon④ Information display

No.
①
②

Name
Gas name/
concentration display
Battery level icon③

Operating status
display④

Information display

Function
Displays the detection target gas name and gas concentration.
Indicates battery levels.
Indicates the operating status in measurement mode.
Blinks when normal. The blinking interval changes from approximately once every
second to approximately once every two seconds if no operation is performed for about
30 seconds. In user mode, the blinking interval changes to approximately once every
four seconds.
Displays various information.

NOTE
 The following is a guide to battery levels:: Sufficient /: Low /
: Replace the batteries.
The battery level icon will blink ( ) if battery levels drop even further.
 If the bump test expiration setting is ON and the bump test expiration date has not passed, [✔] is displayed in
the lower part of the LCD. (Refer to ‘6-4-2. Bump test expiration ON/OFF (BP.RMDR)’.)
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3. Product Configuration

3-3. Inserting the batteries

3-3. Inserting the batteries
When using the product for the first time or when battery levels are low, insert/replace with two new batteries.
The battery types are as follows:<Dry cell specifications> Japan specification:
Power source: 3 V DC, 1 mA (Toshiba LR03 battery × 2)
 Export specification:
Power source: 3 V DC, 1 mA (Toshiba LR03, Duracell MN2400, or Duracell PC2400 battery × 2)
<Rechargeable battery specifications>eneloop (BK-4MCC) (Panasonic) rechargeable battery × 2
1 Confirm that the power for the product is turned
off.
If the power is on, hold down the POWER/MODE
button for at least three seconds to turn off thepower.
2 Use a flathead screwdriver to loosen the battery
cover retaining screw, then open the battery
cover.
If a belt clip has been fitted, open the belt clip.

Battery cover retaining screw
Battery coverBelt clip

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Battery cover3. Product Configuration

3-3. Inserting the batteries

3 Remove the old batteries, then insert newbatteries. Note the polarity.
When removing the batteries, push the [+] end
toward the [−] end and then lift out. Remove thebatteries one at a time.
When inserting the batteries, match the polarity
markings to the markings inside the product.

[+] end[+] endPush the battery toward the [−] end.

Lift the battery out.

4 Close the battery cover, then tighten the battery
cover retaining screw with the flatheadscrewdriver.

DANGER If the product is used as an explosion-proof device, note that the explosion-proofing rating conditions specify thebattery type to be used.
The battery types are as follows:<Dry cell specifications>・ Japan specification:
Power source: 3 V DC, 1mA (Toshiba LR03 battery × 2)
・ Export specification:
Power source: 3 V DC, 1 mA (Toshiba LR03, Duracell MN2400, or Duracell PC2400 battery × 2)
<Rechargeable battery specifications>eneloop (BK-4MCC) (Panasonic) rechargeable battery × 2

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3. Product Configuration

WARNING

3-3. Inserting the batteries

CX An OVER alarm may occur if the power is turned on within 10 minutes of replacing the batteries, the sensor andfilter replacement. This is due to the characteristics of the sensor. If an OVER alarm occurs in fresh air after
replacing the batteries, the sensor and filter replacement, turn off the power, then turn the power on again after
waiting at least 10 minutes.

WARNINGNH3

 Immediately after the power is applied, the indication may rise temporarily. This is due to the characteristics ofthe sensor. When replacing the battery or filter before the battery runs out of power, wait at least 10 minutes, andwhen replacing the sensor, replacing the battery due to a dead battery, or removing the battery and not using it
for a long time, wait at least 120 minutes before turning the power back on.

CAUTION Be sure to turn off the power for the product when replacing the batteries.
 Always replace with two new batteries of the same type.
 Note the polarity when inserting the batteries.
 Do not use any batteries other than the types specified.
 Be sure to replace the batteries in a safe place.

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3. Product Configuration

3-3. Inserting the batteries The date and time setting screen will appear in the following cases. Set the date and time referring to ‘6-12. Dateand time setting (DATE)’.
・ When the batteries are first inserted・ When the batteries are inserted after the product has been left for five minutes or longer without batteries whenreplacing the batteries, etc.
・ When the batteries are inserted with the wrong polarity
・ When a button is pressed without batteries when replacing the batteries, etc.

CAUTION OX G

CO

HS

C-

SO2

NO2

HCN

PH3

 The sensor will take about five minutes to stabilize after the batteries are replaced. After replacing the batteries,
wait at least five minutes before using the product.

CAUTION

CX

CL2

 The sensor will take about 10 minutes to stabilize after the batteries are replaced. After replacing the batteries,
wait at least 10 minutes before using the product.

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4. Alarm Functions

4-1. Gas alarm types and alarm setpoints

4

Alarm Functions
4-1. Gas alarm types and alarm setpoints
OX G

OX

A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in thefollowing table. (Self-latching)Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), and OVER alarm(OVER).
Alarm typeMeasuredgas name

OxygenFirst alarm(WARNING)

Second alarm(ALARM)

Third alarm(ALARM H)

OVER alarm(OVER)

18.0 %

18.0 %

25.0 %

40.0 %

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4. Alarm Functions
CO

4-1. Gas alarm types and alarm setpoints

C-

A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in thefollowing table. (Japan specification: Auto reset/Export specification: Self-latching)Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm(STEL), integrated alarm (A-1H) or TWA alarm (TWA)*, and OVER alarm (OVER).
Alarm typeMeasured Carbon Japangas name monoxide Export

First alarm Second alarm(WARNING)(ALARM)

Third alarm(ALARM H)

STEL alarm(STEL)

Integrated
alarm(A-1H)TWA alarm(TWA)

OVER alarm(OVER)

50 ppm

150 ppm

150 ppm

200 ppm

150 ppm-

2,000 ppm

25 ppm50 ppm

1,200 ppm

200 ppm-

25 ppm

2,000 ppm

*Japan specification: Integrated alarm/Export specification: TWA alarmHS
A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in thefollowing table. (Self-latching)Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm(STEL), TWA alarm (TWA), and OVER alarm (OVER).
Alarm typeMeasured Hydrogen Japangas name sulfide Export

First alarm Second alarm(WARNING)(ALARM)

Third alarm(ALARM H)

STEL alarm(STEL)TWA alarm(TWA)

OVER alarm(OVER)

1.0 ppm

10.0 ppm

10.0 ppm

5.0 ppm

1.0 ppm

200.0 ppm

5.0 ppm

30.0 ppm

100.0 ppm

5.0 ppm

1.0 ppm

200.0 ppm

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4. Alarm Functions

4-1. Gas alarm types and alarm setpoints

CX
A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in thefollowing table. (Japan specification: Auto reset/Export specification: Self-latching)Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm(STEL), integrated alarm (A-1H) or TWA alarm (TWA)*, and OVER alarm (OVER).
Alarm type
Carbonmonoxide Japan
Measured Oxygengas name Carbon
monoxide Export
OxygenFirst alarm Second alarm(WARNING)(ALARM)

Third alarm(ALARM H)

STEL alarm(STEL)

Integrated
alarm(A-1H)TWA alarm(TWA)

OVER alarm(OVER)

50 ppm

150 ppm

150 ppm

200 ppm

150 ppm-

2,000 ppm

18.0 %

18.0 %

25.0 %---

40.0 %

25 ppm50 ppm

1,200 ppm

200 ppm-

25 ppm

2,000 ppm

18.0 %

18.0 %

25.0 %---

40.0 %*Japan specification: Integrated alarm/Export specification: TWA alarm

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4. Alarm Functions

4-1. Gas alarm types and alarm setpoints

SO2
A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in thefollowing table. (Self-latching)Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm(STEL), TWA alarm (TWA), and OVER alarm (OVER).
First alarm(WARNING)

Secondalarm(ALARM)

Third alarm(ALARM H)

STEL alarm(STEL)TWA alarm(TWA)

OVER alarm(OVER)

Japan

2.00 ppm

5.00 ppm

5.00 ppm

5.00 ppm

2.00 ppm

100.00 ppm

Export2.00 ppm

5.00 ppm

100.00 ppm

5.00 ppm

2.00 ppm

100.00 ppm

Alarm typeMeasured Sulfur
gas name dioxide
NO2

A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in thefollowing table. (Self-latching)Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm(STEL), TWA alarm (TWA), and OVER alarm (OVER).
Alarm typeMeasured Nitrogen Japangas name dioxide Export

First alarm(WARNING)

Secondalarm(ALARM)

Third alarm(ALARM H)

STEL alarm(STEL)TWA alarm(TWA)

OVER alarm(OVER)

3.00 ppm

6.00 ppm

6.00 ppm

5.00 ppm

3.00 ppm

20.00 ppm

2.00 ppm

4.00 ppm

20.00 ppm

1.00 ppm

0.50 ppm

20.00 ppm

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4. Alarm Functions

4-1. Gas alarm types and alarm setpoints

HCN
A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in thefollowing table. (Self-latching)Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm(STEL), TWA alarm (TWA), and OVER alarm (OVER).
Alarm typeMeasured Hydrogen Japangas name cyanide Export

First alarm(WARNING)

Secondalarm(ALARM)

Third alarm(ALARM H)

STEL alarm(STEL)TWA alarm(TWA)

OVER alarm(OVER)

4.7 ppm

9.4 ppm

9.4 ppm

4.5 ppm

0.9 ppm

30.0 ppm

10.0 ppm

20.0 ppm

30.0 ppm

4.5 ppm

0.9 ppm

30.0 ppm

PH3
A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in thefollowing table. (Self-latching)Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm(STEL), TWA alarm (TWA), and OVER alarm (OVER).
Alarm typeJapan
Measured
Phosphine
gas name
ExportFirst alarm(WARNING)

Secondalarm(ALARM)

Third alarm(ALARM H)

STEL alarm(STEL)TWA alarm(TWA)

OVER alarm(OVER)

0.30 ppm

0.60 ppm

0.60 ppm

1.00 ppm

0.30 ppm

20.00 ppm

0.30 ppm

0.60 ppm

1.00 ppm

1.00 ppm

0.30 ppm

20.00 ppm

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4. Alarm Functions

4-1. Gas alarm types and alarm setpoints

NH3
A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in thefollowing table. (Self-latching)Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm(STEL), TWA alarm (TWA), and OVER alarm (OVER).
Alarm typeJapan
MeasuredAmmonia
gas name
ExportFirst alarm(WARNING)

Secondalarm(ALARM)

Third alarm(ALARM H)

STEL alarm(STEL)TWA alarm(TWA)

OVER alarm(OVER)

25.0ppm

35.0ppm

35.0ppm

35.0ppm

25.0ppm

400.0ppm

25.0ppm

50.0ppm

300.0ppm

35.0ppm

25.0ppm

400.0ppm

CL2
A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in thefollowing table. (Self-latching)Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm(STEL), TWA alarm (TWA), and OVER alarm (OVER).
Alarm typeJapan
Measured
Chlorinea
gas name
ExportFirst alarm(WARNING)

Secondalarm(ALARM)

Third alarm(ALARM H)

STEL alarm(STEL)TWA alarm(TWA)

OVER alarm(OVER)

0.40ppm

0.80ppm

0.80ppm

1.00ppm

0.50ppm

20.00ppm

1.00ppm

2.00ppm

10.00ppm

1.00ppm

0.50ppm

20.00ppm

39 / 168

4. Alarm Functions

4-1. Gas alarm types and alarm setpoints

NOTE
 The default settings for gas alarm setpoints are as shown in the tables above.
 The setting values for the alarm setpoints can be changed. (Refer to ‘6-5. Alarm setpoint setting (ALARM-P)’.) It is recommended that the gas alarm points be used at their default settings.

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4. Alarm Functions

4-2. Gas alarm activation

4-2. Gas alarm activation<Buzzer and alarm lamp patterns>
When a gas alarm occurs, the user will be alerted by the audible buzzer, flashing alarm lamp, and vibration.
The behavior differs depending on the type of alarm.
Alarm type

BuzzerAlarm
lamp

Vibration

First alarm(WARNING)

Second alarm(ALARM)

Third alarm(ALARM H)

STEL alarm(STEL)

Integrated alarm(A-1H)TWA alarm(TWA)

OVER alarm(OVER)

Repeatedalternatingstrong andweak beeps atabout 1-second
intervals:“Beep, beep”

Repeatedalternatingstrong andweak blips at
about
0.5-second
intervals:“Blip, blip, blip,
blip”

Repeatedalternatingstrong andweak blips at
about
0.5-second
intervals:“Blip, blip, blip,
blip”

Repeatedalternatingstrong andweak beeps atabout 1-second
intervals:“Beep, beep”

Repeatedalternatingstrong andweak beeps atabout 1-secondand 0.5-second
intervals:“Beep, beep”

Repeatedalternatingstrong andweak beeps atabout 1-second
intervals:“Beep, beep”

Repeatedalternatingstrong andweak blips at
about
0.5-second
intervals:“Blip, blip, blip,
blip”

Repeated
flashing at
about 1-second
intervals

Repeated
flashing at
about
0.5-second
intervals

Repeated
flashing at
about
0.5-second
intervals

Repeated
flashing at
about 1-second
intervals

Repeatedalternating
flashing at
about 1-secondand 0.5-second
intervals

Repeated
flashing at
about 1-second
intervals

Repeated
flashing at
about
0.5-second
intervals

The product will vibrate when an alarm occurs.

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4. Alarm Functions

4-2. Gas alarm activation<Gas alarm display>
When a gas alarm occurs, the alarm type isindicated on the LCD display and the corresponding
gas concentration display blinks.
Display example: Carbon monoxide (CO) concentration: 200 ppm
when the third alarm is triggered

NOTE If the gas detection range is exceeded (over scale), [OVER] appears on the LCD display, and [∩∩∩∩] will blinkin the gas concentration display area.

WARNING A gas alarm indicates the presence of extreme danger. The user must take appropriate action after taking
appropriate steps to ensure safety.

NOTE
 The alarm pattern can be checked in the alarm setpoint display in display mode. Note, however, that the gas
concentration display will not blink in alarm tests. (Refer to ‘7-4. Performing alarm tests’.) Press the POWER/MODE button to reset the gas alarm.

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4. Alarm Functions

4-3. Fault alarm activation

4-3. Fault alarm activation
A fault alarm is triggered if an abnormality is detected in the product.
Fault alarm types include system, battery voltage, clock, sensor, and calibration abnormalities.

CAUTION If a fault alarm occurs, determine the cause and take appropriate action.
If the problem lies with the product and the fault occurs repeatedly, contact Riken Keiki immediately.
In the event of a fault alarm, the user will be alerted by the audible buzzer and flashing alarm lamp.
Alarm type

Fault alarm

M OVER alarm (M OVER)

BuzzerRepeated intermittent beeps at about 1-second intervals:“Beep-beep, beep-beep”

Repeated intermittent beeps at about 1-second intervals:“Beep-beep, beep-beep”

Repeated flashing at about 1-second intervals

Repeated flashing at about 1-second intervals

Alarm lamp

LCD display
Display example: System abnormality

Display example: M OVER alarm

NOTE
 For more information on malfunctions (error messages), see ‘9. Troubleshooting’.
 The M OVER alarm (minus sensor failure) is an alarm triggered if the zero point falls below the minus side.
 Press the POWER/MODE button to reset the alarm.

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4. Alarm Functions

4-4. Outside operating temperature range warning

4-4. Outside operating temperature range warning
An outside operating temperature range warning (temperature range error) will be issued if a product (other than the
OX-04G) is used for 20 minutes or more outside the operating temperature range.
When a temperature range error occurs, either leave the product for five minutes or longer in the operating temperature
range, or turn off the power of the main unit.
If an outside operating temperature range warning occurs, the user will be alerted by the audible buzzer and flashingalarm lamp.
Alarm type
BuzzerAlarm lamp

Outside operating temperature range warning
Repeated intermittent beeps at about 1-second intervals: “Beep”
Repeated flashing at about 1-second intervals

LCD display
Display example: Outside operating temperature range warning

NOTE
 Press the POWER/MODE button to reset the alarm.
 The outside operating temperature range warning does not apply to the OX-04G.

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5. Usage Instrucions

5-1. Usage note

5

Usage Instrucions
5-1. Usage note
Observe all usage precautions when using the product.
Failure to comply with these precautions may result in failure of the product or inability to perform normal gas
measurement.

5-2. Preparing startup
Check the following before starting gas detection:
 Confirm that the protective film on the LCD display has been removed.
 Confirm adequate battery levels.
 Confirm that the filters inside the product are neither contaminated nor clogged.

WARNING Protective film is attached to the LCD display of the product at the time of shipping to protect it against
scratching.
Be sure to peel off this protective film before using the product. Explosion-proofing cannot be guaranteed if theprotective film is left attached.

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5. Usage Instrucions

5-3. Turning on the power

5-3. Turning on the power
Turn the power on and start the product.
When the power is turned on, various information, including date and time and alarm setpoints, will be displayed insequence, followed by the measurement mode screen.
1 Hold down the POWER/MODE button (for at least three seconds).
The alarm lamp lights up, and the buzzer blips once.
When the power is turned on, the entire LCD display lights up. The display changes automatically, as shown
below.

NOTE
 When the lunch break ON/OFF (LUNCH) setting is ON, the next time the power is turned on, a confirmation
screen displayed for 5 seconds will prompt you to decide whether to continue measurement by retaining the
PEAK value and the integrated value (TWA value) from the previous session.
Press the POWER/MODE button to retain the value or the AIR button to reset. The value is retained if no action
is taken within five seconds. (Refer to ‘6-6. Lunch break ON/OFF (LUNCH)'.)The retained or reset gas concentration values are as follows:
OX-04G, OX-04:
PEAK value
CO-04, CO-04 (C-), CX-04:
Integrated value or TWA value*, PEAK value (*Japan specification:
Integrated value/Export specification: TWA value)
HS-04, SC-04 (SO2, NO2, HCN, PH3, NH3, CL2): TWA value, PEAK value

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5. Usage Instrucions
OX G

OX

5-3. Turning on the power(Startup time: OX-04G, approx. 20 seconds; OX-04, approx. 40 seconds)

Entire LCD display
lights up.

Calibration
notification*1

Date and time

Battery level/alarm pattern

Detection target
gas nameFirst gas alarm
setpoint

Second gas
alarm setpoint

Third gas alarm
setpoint

Measurement
mode

The buzzer blips
once, and thepower turns on.
Full scale

The buzzer blips
twice, and the
product switches
to measurement
mode.* 2*1 Japan specification: Calibration notification display/Export specification: Calibration expiration display*2 The buzzer does not sound when the key operation tone (KEY.TONE) setting in user mode is set to OFF.

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5. Usage Instrucions
COHS

5-3. Turning on the power
C-

SO2

NH3

CL2

(Startup time: approx. 20 seconds)(Display example: CO-04)

NO2 HCN
Calibration
notification*1

PH3

Date and time

Battery level/alarm pattern

Detection target
gas name

Full scaleFirst gas alarm
setpoint

Second gas alarm
setpoint

Third gas alarm
setpoint

STEL alarm
setpoint

Integrated/TWA
alarm setpoint*2

Measurement
mode

Entire LCD
display lights up.

The buzzer blips once,
and the power turns on.

The buzzer blips twice,
and the product switches
to measurement mode.* 3*1 Japan specification: Calibration notification display/Export specification: Calibration expiration display*2 HS-04, SC-04 (SO2, NO2, HCN, PH3, NH3, CL2): TWA alarm setpoint
CO-04, CO-04 (C-): Japan specification: Integrated alarm setpoint/Export specification: TWA alarm setpoint*3 The buzzer does not sound when the key operation tone (KEY.TONE) setting in user mode is set to OFF.

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5. Usage Instrucions

5-3. Turning on the power(Startup time: approx. 20 seconds)
CX
Entire LCD
Calibration
display lights up.
notification*1

Date and time

Battery level/alarm pattern

Detection target
gas name

Second gas
alarm setpoint

Third gas alarm
setpoint

STEL alarm
setpoint

The buzzer blips once,
and the power turns on.
Full scaleFirst gas alarm
setpoint

Integrated/TWA
alarm setpoint*2

Measurement
mode

The buzzer blips twice,
and the product switches
to measurement mode.* 3*1 Japan specification: Calibration notification display/Export specification: Calibration expiration display*2 Japan specification: Integrated alarm setpoint/Export specification: TWA alarm setpoint*3 The buzzer does not sound when the key operation tone (KEY.TONE) setting in user mode is set to OFF.

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5. Usage Instrucions

5-3. Turning on the power<Basic operation flow>
After turning on the power, the product performs as follows when you press the AIR button or the POWER/MODE
button.
OX GOX<Air calibration>

AIR button
Hold down

POWER/
MODE button<Gas alarm state>

HS

C-

PH3

NH3

CL2 (Display example: CO-04)<Air calibration><Display mode><Measurement mode>

CO

POWER/
MODE button

AIR button
Hold down

POWER/
MODE button

POWER/
MODE button<Fault alarm state>

NO2

HCN

<Display mode><Measurement mode><Gas alarm state>

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SO2POWER/
MODE button

POWER/
MODE button<Fault alarm state>5. Usage Instrucions

5-3. Turning on the power

CX<Air calibration>

AIR button
Hold down<Display mode><Measurement mode>

POWER/
MODE button<Gas alarm state>

POWER/
MODE button

POWER/
MODE button<Fault alarm state>

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5. Usage Instrucions

5-4. Performing air calibration

5-4. Performing air calibration
Perform air calibration before measuring gas concentration.
Air calibration refers to zero adjustment required to ensure accurate measurement of gas concentrations.

WARNING When air calibration is performed in the atmosphere, check the atmosphere for freshness before starting.
The presence of interference gases will prevent proper air calibration. The presence of interference gases is also
extremely dangerous because the product may not detect actual gas leaks correctly.

CAUTION

OX

CO

HS

C-

CX

SO2

NO2

HCN PH3

CL2

 Perform air calibration in an environment that meets all of the following conditions:・ Pressures, temperatures, and humidity levels are similar to pressures, temperatures, and humidity levels in theactual usage environment.
・ In fresh air
 Wait for the readout to stabilize before performing air calibration.
 If the temperature difference between the storage location and usage location is 15 °C or greater, turn on the
power and allow the product to adjust to ambient conditions similar to those at the usage location for about
10 minutes. After this, air calibrate in fresh air before use.

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5. Usage Instrucions

5-4. Performing air calibration

CAUTION OX G NH3
 Perform air calibration in an environment that meets all of the following conditions:・ Pressures, temperatures, and humidity levels are similar to pressures, temperatures, and humidity levels in theactual usage environment.
・ In fresh air
 Wait for the readout to stabilize before performing air calibration.
 If the temperature difference between the storage location and usage location is 15 °C or greater, turn on the
power and allow the product to adjust to ambient conditions similar to those at the usage location for about
30 minutes. After this, air calibrate in fresh air before use.
1 Hold down the AIR button in measurement
mode.
Hold down until the buzzer blips once.
Air calibration starts.

2 Release the AIR button once the LCD display
changes from [Air HOLD] to [AdJ RELEASE].

The product automatically returns to measurementmode once air calibration has been successfullycompleted.
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5. Usage Instrucions

5-4. Performing air calibration

NOTE If air calibration fails, [FAIL AIR] will appear. Air calibration will not be performed.
Press the POWER/MODE button to reset the fault alarm (calibration abnormality). Resetting the alarm displays
the value before air calibration.
 If the quick calibration function is enabled, you can perform quick calibration after successful air calibration inmeasurement mode. To perform quick calibration, hold down the AIR button and release the AIR button when
[E-CAL] appears. (Refer to ‘6-11. Quick calibration time setting (E-CAL)’.)54 / 168

5. Usage Instrucions

5-5. Measuring gas concentration

5-5. Measuring gas concentration
The product automatically returns to measurement mode once air calibration has been successfully completed tomeasure the gas concentration.
The gas concentration will appear on the LCD display when measurement is complete.
If the gas concentration detected reaches the alarm setpoint at this time, a gas alarm is triggered. (Refer to ‘4-2. Gas
alarm activation’.)
OX G

OX

CO

HS

NO2 HCN[O2] (oxygen) gas
concentration
display

PH3

C-

SO2

NH3

CX

CL2

[CO] (carbon monoxide) gas
concentration display

Upper row: [CO] (carbon monoxide)gas concentration display
Middle row: [O2] (oxygen) gas
concentration display

WARNING A gas alarm indicates the presence of extreme danger. The user must take appropriate action after taking
appropriate steps to ensure safety.
 Do not block the buzzer sound opening. Doing so will muffle or silence the audible warning.

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5. Usage Instrucions

CAUTION5-5. Measuring gas concentration

CX The carbon monoxide sensor (ESR-A1CP) includes a correction function to reduce interference due tohydrogen. This function works for hydrogen concentrations up to 2,000 ppm. However, if used in an environment
exceeding 40°C for more than 15 minutes, it may be affected by hydrogen interference and may indicate ahigher carbon monoxide concentration than actual.
 If the carbon monoxide sensor (ESR-A1CP) detects hydrogen at a concentration of 2,000 ppm or higher, [H2]and [rich] are displayed alternately in the concentration display area. While measurement can continue, errors
will arise with carbon monoxide concentration readings due to the significant effects of hydrogen interference.

NOTE
 When the confirmation beep has been set, the buzzer sounds at the set interval during measurement. (Refer to‘6-7. Confirmation beep setting (BEEP)’.) The gas concentration alarm setpoints can be checked in display mode. (Refer to ‘5-6. Checking the gas
concentration, alarm setpoints, etc. (display mode)’.) The LCD backlight lights up when you press the POWER/MODE button or the AIR button. The LCD backlightwill go out after about 30 seconds if no operation is performed. Thirty seconds is the default setting. Change the
LCD backlight lighting time in user mode. (Refer to ‘6-8. LCD lighting time setting (BL TIME)’.) The LCD backlight turns on automatically if an alarm is triggered.

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5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)

5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)
Check measurement results.
Switch to display mode to check items like maximum concentration of gas detected, alarm setpoints, date and time,
and temperature. You can also adjust the buzzer volume.

5-6-1. Procedure for displaying display mode
1 Press the POWER/MODE button inmeasurement mode.
The buzzer blips once, and the product switches todisplay mode.
2 Press the POWER/MODE button to cycle
through the items displayed.
Pressing the POWER/MODE button cycles throughthe displayed items.

Display example:
With date and time
display selected

Press the POWER/MODE button in the buzzer
volume setting screen to end display mode andreturn to measurement mode.

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5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)

NOTE The product returns automatically to measurement mode if no button operations occur for about 20 seconds.
 When display mode item display setting (DISP.SET) is OFF, the buzzer volume setting is not displayed. To end
display mode, press the POWER/MODE button in the alarm setpoint display screen. (Refer to ‘6-10. Display
mode item display ON/OFF (DISP.SET)’.)

5-6-2. Items displayed in display mode
Display item

LCD display
OX G

CO

HS

OX

C-

SO2

NO2

HCN

PH3

NH3

Display contents
CX

CL2(Displayexample: CO-04)
Detection
target gas
display―

Displays the name of the detection target gas.
[CO] (carbon monoxide) is displayed in theupper row. [O2] (oxygen) is displayed in the
middle row.

―

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5. Usage Instrucions
PEAK
display(Lowerlimit value)

5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)

―

―

PEAK
display(Upperlimit value

Displays the minimum gas concentration
detected since the power was turned on.
You can clear the PEAK value (lower limit
value) displayed, by holding down the AIR
button until [RELEASE] appears.

Displays the maximum gas concentration
detected (minimum oxygen concentration
detected for CX-04) since the power was
turned on.
You can clear the PEAK value (upper limit
value) displayed by holding down the AIR
button until [RELEASE] appears.
(Display example: OX-04G)

STEL
display

The time-weighted average for gas
concentration over 15 minutes. The value isrefreshed every 60 seconds.

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5. Usage Instrucions

5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)
Displays the integrated gas concentration
value or the TWA value*.
The integrated value (A-1H) is the timeweighted average for gas concentration over
one hour.
The TWA value (TWA) is the time-weighted
average of the gas concentration over eight
hours per day. The value is refreshed every
60 seconds.

Integrated
display or
TWA
display* HS-04, SC-04 (SO2, NO2, HCN, PH3, NH3,
CL2): TWA display* CO-04, CO-04 (C-), CX-04:
Japan specification: Integrated (A-1H) display/
Export specification: TWA display
Date andtimedisplay

Displays the current time and date.
Display example: January 1, 2019, 10:38

Temperature
display

Displays the current temperature.
The temperature indicated by the temperature
display corresponds to the internal
temperature of the product. This value differsfrom the actual ambient temperature.
Display example: 24 °C

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5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)
Displays alarm setpoints. Pressing the AIR
button lets you change the alarm setpoint display.

Alarm
setpoint
display[OX-04G, OX-04]
Pressing the AIR button cycles through thesettings in the following order:[F.S.] (FULL SCALE) → [WARNING] →[ALARM] → [ALARM H].

[CO-04, HS-04, CO-04(C-), SC-04 (SO2,
NO2, HCN, PH3, NH3, CL2)]
Pressing the AIR button cycles through thesettings in the following order:[F.S.] (FULL SCALE) → [WARNING] →[ALARM] → [ALARM H] → [STEL] →[A-1H] or [TWA]*.

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5. Usage Instrucions

5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)* HS-04, SC-04 (SO2, NO2, HCN, PH3, NH3,
CL2): TWA display* CO-04, CO-04 (C-):
Japan specification: Integrated (A-1H) display/
Export specification: TWA display[CX-04]Pressing the AIR button cycles through thesettings in the following order:[F.S.] (FULL SCALE) → [WARNING] →[ALARM] → [ALARM H] → [STEL] →[A-1H] or [TWA]*.

* Japan specification: Integrated (A-1H)
display/Export specification: TWA display
Displays the buzzer volume. Pressing the AIR
button lets you change the buzzer volume.
Pressing the AIR button toggles the setting
between [LO] (soft) and [HI] (loud).

Buzzervolumesetting

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5. Usage Instrucions

5-7. Turning off the power

NOTE By pressing the AIR button and the POWER/MODE button at the same time while displaying any of the alarm
setpoints in the alarm setpoint display of display mode, you can test the relevant alarm.
(Refer to ‘7-4. Performing alarm tests’.)

5-7. Turning off the power
CAUTION If the concentration display does not return to [0 ppm] (or [20.9 %] for oxygen) when you turn the power off, allow
the product to stand in fresh air. Confirm that the display returns to [0 ppm] (or [20.9 %] for oxygen) before
turning the power off.

1 Hold down the POWER/MODE button (for atleast three seconds).
Hold down until the buzzer blips three times.
[TURN OFF] appears on the LCD. The power turns
off.

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6. User Mode Settings

6-1. User mode setting procedure

6

User Mode Settings
6-1. User mode setting procedure
Set the date and time, alarm setpoints, and other settings in user mode.

<Displaying the user mode setting screen>
Select the setting item in the user mode menu, then make the settings in the setting screen displayed.
1 Turn off the power.
Hold down the POWER/MODE button for at least
three seconds to turn off the power.
2 Hold down the AIR button and the
POWER/MODE button at the same time, thenrelease them when the buzzer blips once.
The entire LCD display lights up, and the user modemenu appears.

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6. User Mode Settings

6-1. User mode setting procedure

A password input screen will appear if a user mode
password was set.
Press the AIR button for each digit to enter the
password, then press the POWER/MODE button.
The user mode menu will appear when you press
the POWER/MODE button after entering the 4th
digit.
3 Press the AIR button several times to select thesetting item.
Pressing AIR button cycles through user modemenu screens.
For information on user mode setting items, see‘6-2. User mode setting items’.

Display example: With date
and time setting (DATE)
selected

4 Press the POWER/MODE button.
The setting screen appears.
Make the settings in each of the setting screens.

NOTE To display the menu one level higher while configuring settings, hold down the AIR button and the
POWER/MODE button at the same time.
 The user mode password is the four-digit number set in user mode password setting (PASS-W). For
information on the user mode password, see ‘6-13. User mode password setting (PASS-W)’.

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6-1. User mode setting procedure<Ending user mode>
1 Once the settings are finished, press the AIR
button several times to select [START], thenpress the POWER/MODE button.
User mode ends. The product returns tomeasurement mode after performing the same
operation as when the power is turned on.

WARNING Be sure to return to measurement mode after user mode settings are complete. The product will not returnautomatically to measurement mode if left in user mode.

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6. User Mode Settings

6-2. User mode setting items

6-2. User mode setting items
The following items can be set in user mode:
Item

LCD display

Details

Bump test(BUMP)

Perform a bump test (function check).
The bump test is a test for checking whether the readings are within theacceptable range by introducing a calibration gas.
For information on the bump test procedure, see ‘7-3. Performing bumptests’.

Calibration(GAS CAL)

Perform air calibration and AUTO calibration.
For information on the calibration procedure, see ‘7-2. Performing
calibration’.

Calibration expiration
setting (CAL SET)

Toggle the calibration expiration ON/OFF for AUTO calibration, set the
number of days for calibration expiration, and set the operation after
calibration date expires.
*Settings available on ATEX/IECEx specification only

Bump test expiration
setting(BUMP.SET)

Set the various conditions for bump testing, toggle the bump test
expiration ON/OFF, set the bump test expiration date interval, and set
the behavior after bump test expiration.

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6. User Mode Settings
Alarm setpoint
setting(ALARM-P)

6-2. User mode setting items
Set alarm setpoints*1. You can also return the alarm setpoints to theirdefault settings.
*1 The following alarm setpoints can be set:
・ OX-04G, OX-04:
First to third alarm setpoints
・ CO-04, CO-04 (C-), CX-04:
First to third alarm setpoints, STEL alarm
setpoint, integrated alarm setpoint or TWA
alarm setpoint*2
・ HS-04, SC-04 (SO2, NO2, HCN, PH3, NH3, CL2):First to third alarm setpoints, STEL alarm
setpoint, TWA alarm setpoint*2 Japan specification: Integrated alarm setpoint/Export specification:
TWA alarm setpoint

Lunch break
ON/OFF(LUNCH)

Set the lunch break setting to ON/OFF.
The lunch break function retains the gas concentration values*1 from thelast time the power was turned off and loads them to resume
measurement the next time the power is turned on.
*1 The retained gas concentration values are as follows:
・ OX-04G, OX-04:
PEAK value
・ CO-04, CO-04 (C-), CX-04:
Integrated value or TWA value*2, PEAK
value
・ HS-04, SC-04 (SO2, NO2, HCN, PH3, NH3, CL2):
TWA value, PEAK value*2 Japan specification: Integrated value/Export specification: TWA
value
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6. User Mode Settings

6-2. User mode setting items

Confirmation beep
setting(BEEP)

Toggle the confirmation beep ON/OFF, set its behavior, and set
intervals.
This function provides an audible indication of whether the product is
operating normally.
If the bump test expiration setting (BP.RMDR) or the calibration
expiration setting (CAL.RMDR) is ON, you can have this function
operate when the expiration date is reached.

LCD lighting time
setting(BL TIME)

Set how long the LCD backlight remains on.

Key operation tone
ON/OFF(KEY.TONE)

Set the key operation tone ON/OFF.

Display mode item
display ON/OFF(DISP.SET)

Set the display ON/OFF for the items that can be set in display mode(buzzer volume setting).

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6-2. User mode setting items

Quick calibration
time setting(E-CAL)Set the time for quick calibration.
The quick calibration function performs AUTO calibration after the
introduction of the calibration gas by automatically counting down thecalibration time set with the quick calibration time setting (E-CAL).

Date and time
setting(DATE)

Set the date and time for the internal clock.

User mode
password setting(PASS-W)

Set a password when transitioning to user mode.
Set a password between 0000 and 9999.

ROM/SUM display(ROM/SUM)

This displays the program number and SUM value of the product.
This is normally not set or adjusted by the user.

Measurement start(START)

Return to measurement mode.

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6. User Mode Settings

6-3. Calibration expiration setting (CAL SET)

6-3. Calibration expiration setting (CAL SET)The following items can be set in the calibration expiration setting (CAL SET). (Settings available on ATEX/IECEx
specification only)
Calibration expiration setting (CAL SET)
Calibration expiration ON/OFF (CAL.RMDR)
Calibration expiration date interval (CAL.INT)
Setting operation after calibration date expires (CAL.EXPD)
ESCAPENOTE
 To display the menu one level higher while configuring settings, hold down the AIR button and the
POWER/MODE button at the same time.
 To end the calibration expiration settings (CAL SET), press the AIR button several times to select [ESCAPE],
then press the POWER/MODE button. The display returns to the user mode menu.

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6-3. Calibration expiration setting (CAL SET)

6-3-1. Calibration expiration ON/OFF (CAL.RMDR)This toggles calibration expiration ON/OFF for AUTO calibration.
If calibration expiration is set to ON, when the expiration date set in calibration expiration date interval (CAL.INT) is
reached, the operation set in setting operation after calibration date expires (CAL.EXPD) is performed.
The default setting is ON (for ATEX/IECEx specification).
1 Press the AIR button several times in user
mode to select [CAL SET], then press the
POWER/MODE button.
2 Select [CAL.RMDR], then press the
POWER/MODE button.
3 Press the AIR button several times to select[ON] or [OFF], then press the POWER/MODE
button.
[END] appears once the settings are complete. The
display returns to the [CAL.RMDR] screen.

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6-3. Calibration expiration setting (CAL SET)

6-3-2. Calibration expiration date interval (CAL.INT)
This sets the number of days (1 to 1,000 days) for the calibration expiration for AUTO calibration.
The default setting is 90 days.
1 Press the AIR button several times in user
mode to select [CAL SET], then press the
POWER/MODE button.
2 Press the AIR button several times to select[CAL.INT], then press the POWER/MODE
button.
3 Press the AIR button several times to select the
number of days for the calibration expiration,then press the POWER/MODE button.
[END] appears once the settings are complete. The
display returns to the [CAL.INT] screen.

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6-3. Calibration expiration setting (CAL SET)

6-3-3. Setting operation after calibration date expires (CAL.EXPD)
Set the operation performed when the calibration date for AUTO calibration expires.
Select one of the following: CONFIRM:
The behavior differs depending on the operation.
Press the AIR button to proceed to measurement mode or press the POWER/MODE button toproceed to AUTO calibration.
 CANT.USE: Measurement mode is not available. Press the POWER/MODE button to proceed to AUTO
calibration. Alternatively, the product will automatically proceed to AUTO calibration after about six
seconds.
 NONE:The behavior differs depending on the operation.
If the product indicates that the expiration date has been reached, press the POWER/MODE button
to proceed to AUTO calibration. If you do nothing, the product will proceed to measurement mode
after about six seconds.
The default setting is CONFIRM.
1 Press the AIR button several times in user
mode to select [CAL SET], then press the
POWER/MODE button.
2 Press the AIR button several times to select[CAL.EXPD], then press the POWER/MODE
button.

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6-3. Calibration expiration setting (CAL SET)3 Press the AIR button several times to select theoperation after calibration date expires, thenpress the POWER/MODE button.
Select [CONFIRM], [CANT.USE], or [NONE].
[END] appears once the settings are complete. The
display returns to the [CAL.EXPD] screen.

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6. User Mode Settings

6-4. Bump test expiration setting (BUMP.SET)

6-4. Bump test expiration setting (BUMP.SET)The following items can be set in the bump test expiration setting (BUMP.SET):
Bump test expiration setting (BUMP.SET)
Bump test setting (SETTING)
Bump test time setting (GAS.TIME)
Bump test tolerance setting (CHECK)
Bump test calibration time setting (CAL.TIME)
Bump test calibration ON/OFF (A-CAL)
ESCAPE
Bump test expiration ON/OFF (BP.RMDR)
Bump test expiration date interval setting (BP.INT)
Setting behavior after bump test expiration (BP.EXPD)
ESCAPENOTE
 To display the menu one level higher while configuring settings, hold down the AIR button and the
POWER/MODE button at the same time.
 To end the bump test expiration settings (BUMP.SET), press the AIR button several times to select [ESCAPE],
then press the POWER/MODE button. The display returns to the user mode menu.
 To end the bump test settings (SETTING), press the AIR button several times to select [ESCAPE], then press
the POWER/MODE button. The display returns to the bump test expiration setting (BUMP.SET) menu.

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6-4. Bump test expiration setting (BUMP.SET)

6-4-1. Bump test setting (SETTING)
Set the bump test time, bump test tolerance, calibration time, and ON/OFF for calibration after a bump test failure.

<Bump test time setting (GAS.TIME)>
This lets you set the time at which the calibration gas is introduced when performing a bump test.
Select from 30, 45, 60, and 90 seconds. The default setting is 30 seconds.
1 Press the AIR button several times in user
mode to select [BUMP.SET], then press the
POWER/MODE button.
2 Select [SETTING], then press the
POWER/MODE button.
3 Select [GAS.TIME], then press the
POWER/MODE button.
4 Press the AIR button several times to select thetime for the bump test, then press the
POWER/MODE button.
Select [30], [45], [60], or [90].
[END] appears once the settings are complete. The
display returns to the [GAS.TIME] screen.

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6-4. Bump test expiration setting (BUMP.SET)<Bump test tolerance setting (CHECK)>
Set the bump test tolerance (threshold for determining pass or failure for the bump test).
Select from 10, 20, 30, 40, and 50 %. The default setting is 50 %.
1 Press the AIR button several times in user
mode to select [BUMP.SET], then press the
POWER/MODE button.
2 Select [SETTING], then press the
POWER/MODE button.
3 Press the AIR button several times to select[CHECK], then press the POWER/MODE button.
4 Press the AIR button several times to select thebump tolerance, then press the POWER/MODE
button.
Select [10], [20], [30], [40], or [50].
[END] appears once the settings are complete. The
display returns to the [CHECK] screen.

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6. User Mode Settings

6-4. Bump test expiration setting (BUMP.SET)<Bump test calibration time setting (CAL.TIME)>
Set the time for calibration after a bump test fails.
Select from 60, 90, and 120 seconds. The default setting is 60 seconds.
1 Press the AIR button several times in user
mode to select [BUMP.SET], then press the
POWER/MODE button.
2 Select [SETTING], then press the
POWER/MODE button.
3 Press the AIR button several times to select[CAL.TIME], then press the POWER/MODE
button.
4 Press the AIR button several times to select thecalibration time after a bump test, then press
the POWER/MODE button.
Select [60], [90], or [120].
[END] appears once the settings are complete. The
display returns to the [CAL.TIME] screen.

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6-4. Bump test expiration setting (BUMP.SET)<Bump test calibration ON/OFF (A-CAL)>
Set whether calibration is to be performed after a bump test fails.
If this is set to ON, calibration (AUTO calibration) is performed automatically when a bump test fails.
The default setting is ON.
1 Press the AIR button several times in user
mode to select [BUMP.SET], then press the
POWER/MODE button.
2 Select [SETTING], then press the
POWER/MODE button.
3 Press the AIR button several times to select[A-CAL], then press the POWER/MODE button.
4 Press the AIR button several times to select[ON] or [OFF], then press the POWER/MODE
button.
[END] appears once the settings are complete. The
display returns to the [A- CAL] screen.

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6-4. Bump test expiration setting (BUMP.SET)

6-4-2. Bump test expiration ON/OFF (BP.RMDR)This toggles the bump test expiration ON/OFF.
If the setting is ON, the operation set in setting behavior after bump test expiration (BP.EXPD) is performed when the
expiration date set in bump test expiration date interval setting (BP.INT) is reached.
The default setting is OFF.
1 Press the AIR button several times in user
mode to select [BUMP.SET], then press the
POWER/MODE button.
2 Press the AIR button several times to select[BP.RMDR], then press the POWER/MODE
button.
3 Press the AIR button several times to select[ON] or [OFF], then press the POWER/MODE
button.
[END] appears once the settings are complete. The
display returns to the [BP.RMDR] screen.

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6-4. Bump test expiration setting (BUMP.SET)

6-4-3. Bump test expiration date interval setting (BP.INT)
This sets the number of days (0 to 30 days) for bump test expiration.
The default setting is 30 days.
1 Press the AIR button several times in user
mode to select [BUMP.SET], then press the
POWER/MODE button.
2 Press the AIR button several times to select[BP.INT], then press the POWER/MODE button.
3 Press the AIR button several times to set thebump test expiration date interval, then press
the POWER/MODE button.
[END] appears once the settings are complete. The
display returns to the [BP.INT] screen.

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6-4. Bump test expiration setting (BUMP.SET)

6-4-4. Setting behavior after bump test expiration (BP.EXPD)
This selects the behavior after the bump test expiration date.
Select one of the following: CONFIRM:
The behavior differs depending on the operation.
Press the AIR button to proceed to measurement mode or press the POWER/MODE button toproceed to the bump test.
 CANT.USE: Measurement mode is not available. Press the POWER/MODE button to proceed to the bump test.
If you do nothing, the product will automatically proceed to the bump test after about six seconds.
 NONE:The behavior differs depending on the operation.
If the product indicates that the expiration date has been reached, press the POWER/MODE button
to proceed to the bump test. If you do nothing, the product will proceed to measurement mode after
about six seconds.
The default setting is CONFIRM.
1 Press the AIR button several times in user
mode to select [BUMP.SET], then press the
POWER/MODE button.
2 Press the AIR button several times to select[BP.EXPD], then press the POWER/MODE
button.

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6-4. Bump test expiration setting (BUMP.SET)

3 Press the AIR button several times to select the
behavior after expiration, then press the
POWER/MODE button.
Select [CONFIRM], [CANT.USE], or [NONE].
[END] appears once the settings are complete. The
display returns to the [BP.EXPD] screen.

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6. User Mode Settings

6-5. Alarm setpoint setting (ALARM-P)

6-5. Alarm setpoint setting (ALARM-P)
This is used to set alarm setpoints. You can also return the alarm setpoints to their default settings.
The following items can be set in the alarm setpoint setting (ALARM-P):
Alarm setpoint setting (ALARM-P)
Alarm setpoint setting (ALARM-P)
Resetting alarm setpoints (DEF.ALMP)ESCAPENOTE
 To display the menu one level higher while configuring settings, hold down the AIR button and the
POWER/MODE button at the same time.
 To end the alarm setpoint settings (ALARM-P), press the AIR button several times to select [ESCAPE], thenpress the POWER/MODE button. The display returns to the user mode menu.
 It is recommended that the gas alarm points be used at their default settings.

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6. User Mode Settings

6-5. Alarm setpoint setting (ALARM-P)

6-5-1. Alarm setpoint setting (ALARM-P)<Alarm setpoint setting range>
Alarm setpoints can be set in increments corresponding to the resolution.
OX G

OX

Detection target gas

Resolution

Oxygen (O2)

0.1 %

CO

First/second alarm
Lower limit Upper limit
0.0 %
20.0 %

Third alarm
Lower limit
Upper limit
21.8 %
40.0 %

Resolution
1 ppm (0 to 300 ppm)
10 ppm(300 to 2,000 ppm)

Lower limit

Upper limit

20 ppm

2,000 ppm

Resolution
0.1 ppm(0.0 to 30.0 ppm)
1.0 ppm(30.0 to 200.0 ppm)

Lower limit

Upper limit

1.0 ppm

200.0 ppm

C-

Detection target gas
Carbon monoxide(CO)HS
Detection target gas
Hydrogen sulfide (H2S)

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6. User Mode Settings

6-5. Alarm setpoint setting (ALARM-P)

CX
Detection target gas

Resolution
1 ppm (0 to 300 ppm)
10 ppm(300 to 2,000 ppm)

Lower limit

Upper limit

20 ppm

2,000 ppm

Detection target gas

Resolution

Oxygen (O2)

0.1 %First/second alarm
Lower limit Upper limit
0.0 %
20.0 %

Third alarm
Lower limit
Upper limit
21.8 %
40.0 %

Detection target gas

Resolution
0.05 ppm(0.00 to 100.00 ppm)

Lower limit

Upper limit

0.50 ppm

100.00 ppm

Resolution
0.05 ppm(0.00 to 20.00 ppm)

Lower limit

Upper limit

0.50 ppm

20.00 ppm

Resolution
0.1 ppm(0.0 to 30.0 ppm)

Lower limit

Upper limit

0.9 ppm

30.0 ppm

Carbon monoxide
(CO)

SO2
Sulfur dioxide (SO2)
NO2
Detection target gas
Nitrogen dioxide (NO2)
HCN
Detection target gas
Hydrogen cyanide(HCN)

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6. User Mode Settings

6-5. Alarm setpoint setting (ALARM-P)

PH3
Detection target gas
Phosphine (PH3)

Resolution
0.01 ppm

Lower limit
0.05 ppm

Upper limit
20.0 ppm

Resolution
0.5ppmLower limit
8.0ppmUpper limit
400.0ppm

Resolution
0.05ppm

Lower limit
0.15ppm

Upper limit
20.00ppm

NH3
Detection target gas
Ammonia (NH3)
CL2
Detection target gas
Chlorine (CL2)<Alarm setpoint setting> OX G

OX

CO

HS

C-

SO2

NO2 HCN

PH3

NH3

CL2

(Display example: CO-04)

Set the alarm setpoints as follows: First alarm ≤ second alarm ≤ third alarm (first alarm ≥ second alarm for oxygen [O2]).
1 Press the AIR button several times in user
mode to select [ALARM-P], then press the
POWER/MODE button.
2 Confirm the name of the target gas, then press
the POWER/MODE button.

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6. User Mode Settings

6-5. Alarm setpoint setting (ALARM-P)

3 Press the POWER/MODE button several times
to select the alarm type.
Alarm setpoints are displayed in the following order:
OX-04G, OX-04:
First alarm setpoint → Second alarm setpoint →Third alarm setpoint
CO-04, CO-04 (C-):
First alarm setpoint → Second alarm setpoint →Third alarm setpoint → STEL alarm setpoint →Integrated alarm setpoint or TWA alarm setpoint**Japan specification: Integrated alarm
setpoint/Export specification: TWA alarm setpoint
HS-04, SC-04 (SO2, NO2, HCN, PH3, NH3, CL2):First alarm setpoint → Second alarm setpoint →Third alarm setpoint → STEL alarm setpoint →TWA alarm setpoint
4 Press the AIR button several times to set thevalue for the alarm setpoint, then press the
POWER/MODE button.
Set each alarm setpoint within the valid range ofsetpoints.

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6-5. Alarm setpoint setting (ALARM-P)

Furthermore, set as follows: First alarm ≤ second
alarm ≤ third alarm (first alarm ≥ second alarm foroxygen [O2]).
[END] appears once the settings are complete. The
display returns to the [ALARM-P] (target gas
display) screen.

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6. User Mode Settings<Alarm setpoint setting>

6-5. Alarm setpoint setting (ALARM-P)
CX

Set the alarm setpoints as follows: First alarm ≤ second alarm ≤ third alarm (first alarm ≥ second alarm for oxygen [O2]).
1 Press the AIR button several times in user
mode to select [ALARM-P], then press the
POWER/MODE button.
2 Press the AIR button several times to select thetarget gas, then press the POWER/MODE
button.
Select either [CO] or [O2].
3 Press the POWER/MODE button several times
to select the alarm type.
Alarm setpoints are displayed in the following order:
For [CO] (carbon monoxide):First alarm setpoint → Second alarm setpoint →Third alarm setpoint → STEL alarm setpoint →Integrated alarm setpoint or TWA alarm setpoint** Japan specification: Integrated alarm
setpoint/Export specification: TWA alarm setpoint
For [O2] (oxygen):First alarm setpoint → Second alarm setpoint →Third alarm setpoint

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6. User Mode Settings

6-5. Alarm setpoint setting (ALARM-P)

4 Press the AIR button several times to set thevalue for the alarm setpoint, then press the
POWER/MODE button.
Set each alarm setpoint within the valid range ofsetpoints.
Furthermore, set as follows: First alarm ≤ second
alarm ≤ third alarm (first alarm ≥ second alarm foroxygen [O2]).
[END] appears once the settings are complete. The
display returns to the [ALARM-P] (target gas
display) screen.

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6-5. Alarm setpoint setting (ALARM-P)

6-5-2. Resetting alarm setpoints (DEF.ALMP)This restores alarm setpoints to their default settings.
For more information on default settings for alarm setpoints, see ‘4-1. Gas alarm types and alarm setpoints’.
1 Press the AIR button several times in user
mode to select [ALARM-P], then press the
POWER/MODE button.
2 Press the AIR button several times to select[DEF.ALMP], then press the POWER/MODE
button.
3 Press the POWER/MODE button.
To cancel the reset, press the AIR button.

4 Press the POWER/MODE button when the reset
confirmation screen appears.
To cancel the reset, press the AIR button.
[END] appears once the settings are complete. The
display returns to the [DEF.ALMP] screen.

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6. User Mode Settings

6-6. Lunch break ON/OFF (LUNCH)

6-6. Lunch break ON/OFF (LUNCH)
Set the lunch break setting to ON/OFF.
The lunch break function retains the gas concentration values from the last time the power was turned off and loads
them to resume measurement the next time the power is turned on.
When the lunch break setting is ON, a confirmation screen will appear the next time the power is turned on and prompt
you to decide whether to retain the gas concentration values from the last time the power was turned off and resume
measurement or to reset the values from the last time the power was turned off.
The default setting is OFF.
The retained gas concentration values are as follows: OX-04G, OX-04:
PEAK value CO-04, CO-04 (C-), CX-04:
Integrated value or TWA value*, PEAK value HS-04, SC-04 (SO2, NO2, HCN, PH3, NH3, CL2): TWA value, PEAK value*Japan specification: Integrated value/Export specification: TWA value
1 Press the AIR button several times in user
mode to select [LUNCH], then press the
POWER/MODE button.
2 Press the AIR button several times to select[ON] or [OFF], then press the POWER/MODE
button.
[END] appears once the settings are complete. The
display returns to the user mode menu.
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6-7. Confirmation beep setting (BEEP)

6-7. Confirmation beep setting (BEEP)
This function provides an audible indication of whether the product is operating normally while measuring gas
concentrations.
The following items can be set in the confirmation beep setting (BEEP):
Confirmation beep setting (BEEP)
Beep operation setting (BEEP.SEL)
Beep interval setting (BEEP.INT)ESCAPENOTE
 To display the menu one level higher while configuring settings, hold down the AIR button and the
POWER/MODE button at the same time.
 To end the confirmation beep settings (BEEP), press the AIR button several times to select [ESCAPE], thenpress the POWER/MODE button. The display returns to the user mode menu.

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6. User Mode Settings

6-7. Confirmation beep setting (BEEP)

6-7-1. Beep operation setting (BEEP.SEL)
Set the confirmation beep operation.
Select one of the following. The default setting is OFF.
• OFF:
The confirmation beep is OFF.
• LED:
The alarm lamp lights up.
• BUZZER: The buzzer sounds.
• LED+BUZ: The alarm lamp lights up, and the buzzer sounds.
• BMP/CAL: If the bump test expiration setting or the calibration expiration setting is ON, the alarm lamp lights up
when the expiration date is reached.
1 Press the AIR button several times in user
mode to select [BEEP], then press the
POWER/MODE button.
2 Select [BEEP.SEL], then press the
POWER/MODE button.
3 Press the AIR button several times to select the
behavior of the confirmation beep, then press
the POWER/MODE button.
Select [OFF], [LED], [BUZZER], [LED+BUZ], or[BMP/CAL].
[END] appears once the settings are complete. The
display returns to the [BEEP.SEL] screen.

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6-7. Confirmation beep setting (BEEP)

6-7-2. Beep interval setting (BEEP.INT)
Set the interval between confirmation beeps.
Set the interval to 0.5 minutes or to a value from 1 to 99 minutes. The default setting is 5 minutes.
1 Press the AIR button several times in user
mode to select [BEEP], then press the
POWER/MODE button.
2 Press the AIR button several times to select[BEEP.INT], then press the POWER/MODE
button.
3 Press the AIR button several times to set theinterval for the confirmation beep, then press
the POWER/MODE button.
[END] appears once the settings are complete. The
display returns to the [BEEP.INT] screen.

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6. User Mode Settings

6-8. LCD lighting time setting (BL TIME)

6-8. LCD lighting time setting (BL TIME)
Set the duration for which the LCD backlight remains lit.
Set the LCD lighting time to OFF or to a value from 1 to 255 seconds. The default setting is 30 seconds.
1 Press the AIR button several times in user
mode to select [BL TIME], then press the
POWER/MODE button.

2 Press the AIR button several times to set the
LCD lighting time, then press the
POWER/MODE button.
You can set to [OFF] or to a value from [1] to [255].
[END] appears once the settings are complete. The
display returns to the user mode menu.

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6. User Mode Settings

6-9. Key operation tone ON/OFF (KEY.TONE)

6-9. Key operation tone ON/OFF (KEY.TONE)
Select ON/OFF for the key operation tone when you press the AIR button or the POWER/MODE button.
If this setting is set to ON, the key operation tone will sound when you press the AIR button or the POWER/MODE
button.
The default setting is ON.
1 Press the AIR button several times in user
mode to select [KEY.TONE], then press the
POWER/MODE button.

2 Press the AIR button several times to select[ON] or [OFF], then press the POWER/MODE
button.
[END] appears once the settings are complete. The
display returns to the user mode menu.

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6-10. Display mode item display ON/OFF (DISP.SET)

6-10. Display mode item display ON/OFF (DISP.SET)
You can select whether to display or hide items that can be set in display mode (buzzer volume setting).
If this is set to OFF, the items that can be set in display mode (buzzer volume setting) will not be displayed.
The default setting is ON.
1 Press the AIR button several times in user
mode to select [DISP.SET], then press the
POWER/MODE button.

2 Press the AIR button several times to select[ON] or [OFF], then press the POWER/MODE
button.
[END] appears once the settings are complete. The
display returns to the user mode menu.

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6. User Mode Settings

6-11. Quick calibration time setting (E-CAL)

6-11. Quick calibration time setting (E-CAL)
The quick calibration function performs AUTO calibration after the introduction of the calibration gas by automaticallycounting down the calibration time set with the quick calibration time setting (E-CAL).
Select OFF or a time from 1 to 180 seconds for quick calibration time.
The default settings are as follows:
・ For CO-04, CO-04 (C-), CX-04 Japan Ex specification: 60 seconds
・ For models other than the above: OFF
1 Press the AIR button several times in user
mode to select [E-CAL], then press the
POWER/MODE button.
2 Press the AIR button several times to set thetime for quick calibration, then press the
POWER/MODE button.
Set to [OFF] or to a value from [1] to [180].
[END] appears once the settings are complete. The
display returns to the user mode menu.

NOTE
 The standard calibration time for AUTO calibration is 60 seconds. While AUTO calibration will finish faster if you
set this to a lesser value, doing so may affect the precision of the readings.
 When quick calibration is enabled, the AUTO calibration menu display changes from [A-CAL] to [E-CAL].
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6. User Mode Settings

6-12. Date and time setting (DATE)

6-12. Date and time setting (DATE)
Set the date and time for the internal clock.
1 Press the AIR button several times in user
mode to select [DATE], then press the
POWER/MODE button.

2 Press the POWER/MODE button to select eachof Year, Month, Day, Hour, and Minutes, thenpress the AIR button to set the date and time.
Pressing the POWER/MODE button cycles throughthe items in the following order: Year → Month →Day → Hour → Minutes.
3 When the settings are complete, select[Minutes], then press the POWER/MODE
button.
[END] appears once the settings are complete. The
display returns to the user mode menu.

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6. User Mode Settings

6-13. User mode password setting (PASS-W)

6-13. User mode password setting (PASS-W)
Set a password when transitioning to user mode.
If the setting is ON, access to user mode is password-protected and a password input screen is displayed when theuser seeks to enter user mode.
The default setting is OFF.
If this is set to ON, set a four-digit password between 0000 and 9999. The default setting is 0000.
1 Press the AIR button several times in user
mode to select [PASS-W], then press the
POWER/MODE button.
2 Press the AIR button several times to select[ON] or [OFF] for the password setting, thenpress the POWER/MODE button.
If [ON] is selected, a password setting screen
appears.
If [OFF] is selected, [END] appears. The display
returns to the user mode menu.
3 Press the AIR button several times to set the
password one digit at a time, then press the
POWER/MODE button.
Set the password one digit at a time, starting fromthe left. Select a number with the AIR button, thenpress the POWER/MODE button to move to thenext digit to the right.
When you have set the 4th digit and press the
POWER/MODE button, [END] appears. The display
returns to the user mode menu.
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6-14. ROM/SUM display (ROM/SUM)

6-14. ROM/SUM display (ROM/SUM)
This displays the program number and SUM value of the product.
This is normally not set or adjusted by the user.
1 Press the AIR button several times in user
mode to select [ROM/SUM], then press the
POWER/MODE button.
2 Check the program number and the SUM value,then press the POWER/MODE button.

[END] appears. The display returns to the user
mode menu.

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7. Maintenance7-1. Maintenance intervals and maintenance items

7

Maintenance
The product is an important safety and disaster-prevention device.
Perform product maintenance at regular intervals to ensure performance and to improve disaster-prevention and safety
reliability.

7-1. Maintenance intervals and maintenance items
Maintain the following items at regular intervals:
 Daily maintenance:
Perform maintenance before commencing work.
 Monthly maintenance: Perform alarm tests monthly. (Refer to ‘7-4. Performing alarm tests’.) Regular maintenance: Perform maintenance at least once a year (ideally, at least once every six months).
Maintenance
item

Maintenance details

Daily
Monthly
Regularmaintenance maintenance maintenanceCheck to confirm that battery levels are adequate.

〇

〇

〇

Check to confirm that the concentration readout is [0 ppm] ([20.9 %]Concentration for oxygen) by measuring fresh air.
display
If the readout is not [0 ppm] ([20.9%] for oxygen), check to confirm
that no interference gases are present, then perform air calibration.

〇

〇

〇

〇

〇

〇

Battery level

Main unit
operation

Check to confirm that no fault alarm is displayed on the LCD display.

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7. Maintenance7-1. Maintenance intervals and maintenance items

Maintenance
item

Maintenance details

Daily
Monthly
Regularmaintenance maintenance maintenanceCheck to confirm that the filters are not dirty.

〇

〇

〇

Alarm test

Perform a test. Check to confirm that the alarm lamp, buzzer, andvibration are functioning normally.

―

〇

〇

Calibration

Perform calibration using a calibration gas.

―

―

〇

Gas alarm
check

Check the gas alarm using a calibration gas.

―

―

〇

Filters

WARNING If you encounter a product abnormality, contact Riken Keiki immediately.
 When using the SC-04 (HCN), dirt on the face in contact with the CF-A13D-3 does not pose issues.

NOTE
 Calibration requires dedicated tools and the preparation of a calibration gas. Contact Riken Keiki before
performing calibration.
 The built-in sensor has an expiration date. Replace periodically.
 The sensor needs to be replaced if you encounter symptoms like failure to restore readings after air calibration
or fluctuating readings when performing calibration. Contact Riken Keiki for replacement.

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7. Maintenance7-2. Performing calibration

7-2. Performing calibration
The product can be calibrated using AUTO calibration with preset gas concentrations, in addition to air calibration
performed in the atmosphere.
Calibration requires dedicated tools and a calibration gas. Contact Riken Keiki before performing calibration.

7-2-1. Preparation for calibration
Prepare the following equipment and calibration gases, then connect to this product:<Required equipment> Gas set(Gas sampling bag, tube (length not exceeding 1 m), pump with flow adjuster function (a pump, flow gauge, andneedle can also be used.)) Calibration adapter
 Stopwatch<Calibration gases and recommended gas concentrations>
The calibration gases and recommended gas concentrations are as follows. (Japan standard)
Model
OX-04G, OX-04
CO-04
HS-04
CO-04 (C-)

Calibration gas
N2
CO (N2-based)
H2S (N2-based)
CO (N2-based)
H2 (air-based)*

Recommended value
99.9 % or more
80 ppm16 ppm80 ppm
500 ppm*H2 (air-based) must be calibrated at ambient temperatures ranging from 10 °C to 30 °C.

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7. Maintenance
Model
CX-04
SC-04 (SO2)
SC-04 (NO2)
SC-04 (HCN)
SC-04 (PH3)
SC-04 (NH3)SC-04 (CL2)7-2. Performing calibration
Calibration gas
CO (N2-based)
N2
SO2 (N2-based)
NO2 (Air-based)
HCN (Air-based)

Recommended value

80 ppm
99.9 % or more
8 ppm
4.8 ppm
8 ppm
0.5 ppm (HCN concentration = PH3
PH3 (N2-based, substitute gas)*
concentration × conversion factor)
PH3 (N2-based)
0.50ppm
NH3 (N2-based)
40ppm
Cl2 (Air-based)
0.8ppm* For PH3 (N2-based, substitute gas), calibrate within the range from 10 °C to 30 °C with the filter removed.

<Connecting the equipment>
Before performing calibration, attach the calibration adapter, connect as shown below, then adjust the flow of thecalibration gas to 250 ±10 mL/min.
Connect the gas sampling bag when the gas concentration display is blinking ([A-CAL] and [APPLY] alternate on thedisplay) during AUTO calibration.

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7. Maintenance
OX G

OX

7-2. Performing calibration
CO

HS

C-

CX

Tube (total length not exceeding 1 m)
GAS INGas samplingbag

Pump with flow adjuster function(A pump, flow gauge, and needle
can also be used.)
Flow rate: 250 ±10 mL/min

SO2

NO2 HCN PH3NH3GAS OUTGAS OUT should be released into the atmosphere.

CL2

Calibration adapter

Gas samplingbag

Pump with flow adjuster
function(A pump, flow gauge, andneedle can also be used.)
Flow rate: 250 ±10 mL/min

Calibration adapter

GAS INGAS OUT

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7. Maintenance7-2. Performing calibration

NOTE Be careful not to pull the calibration cap upward by the tubing connected to the calibration cap.

WARNINGGas sampling bag
 Use different gas sampling bags for each gas type and concentration to ensure accurate calibration.
Calibration location
 Do not calibrate in confined spaces.
 Do not calibrate in locations where gases such as silicone and spray can gases are used.
 Calibrate indoors at normal temperatures free of significant temperature fluctuations (within ±5 °C).

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7. Maintenance7-2. Performing calibration

WARNING OX G
Handling the calibration gas
 Inhaling the calibration gas may lead to loss of health or even death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.
 The calibration gas used should be nitrogen or a standard gas consisting of oxygen diluted with nitrogen.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations will
result in poor sensitivity and inaccurate concentration readings.
Handle the calibration gases and the equipment used for calibration with due care.
 Calibration gases include hazardous gases (e.g., nitrogen gas). Handle with due care.

WARNING

OX

Handling the calibration gas
 The calibration gas is nitrogen. Inhaling the gas may lead to loss of health or even death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.
 The calibration gas used should be a standard gas consisting of oxygen diluted with nitrogen or air.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations will
result in poor sensitivity and inaccurate concentration readings.
 Do not expose the product to sudden pressure fluctuations. Oxygen readings will fluctuate briefly, preventing
accurate calibration.

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7. Maintenance7-2. Performing calibration

Handle the calibration gases and the equipment used for calibration with due care.
 Calibration gases include hazardous gases (e.g., nitrogen gas). Handle with due care.
 Do not apply a load on the GAS OUT end.

WARNINGCO

Handling the calibration gas
 The calibration gas (carbon monoxide) is toxic. Inhaling the gas may lead to loss of health or even death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.
 The calibration gas used should be a standard gas, which is carbon monoxide diluted with nitrogen or air.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations will
result in poor sensitivity and inaccurate concentration readings.
Handle the calibration gases and the equipment used for calibration with due care.
 Calibration gases include hazardous gases (e.g., toxic gases, nitrogen gas). Handle with due care.

WARNINGHS

Handling the calibration gas
 The calibration gas (hydrogen sulfide) is toxic. Inhaling the gas may lead to loss of health or even death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.

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7. Maintenance7-2. Performing calibration

 The calibration gas used should be a standard gas consisting of hydrogen sulfide diluted with nitrogen or air.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations will
result in poor sensitivity and inaccurate concentration readings.
Handle the calibration gases and the equipment used for calibration with due care.
 Calibration gases include hazardous gases (e.g., toxic gases, nitrogen gas). Handle with due care.

WARNINGC-

Handling the calibration gas
 The calibration gas (carbon monoxide) is toxic. Inhaling the gas may lead to loss of health or even death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.
 The calibration gases used should be a standard gas consisting of carbon monoxide diluted with nitrogen or air
and a standard gas consisting of hydrogen diluted with air.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations will
result in poor sensitivity and inaccurate concentration readings.
 The carbon monoxide sensor with hydrogen compensation must be calibrated separately for carbon monoxideand hydrogen.
 If hydrogen sensitivity calibration is not performed, carbon monoxide readings may be inaccurate due tohydrogen interference.
 Due to the hydrogen compensation mechanism, carbon monoxide readings may increase temporarily ifhydrogen gas concentrations increase rapidly in the atmosphere being measured.
Handle the calibration gases and the equipment used for calibration with due care.
 Calibration gases include hazardous gases (e.g., toxic gases, nitrogen gas). Handle with due care.

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7. Maintenance

WARNING

7-2. Performing calibration

CX

Handling the calibration gas
 The calibration gases are nitrogen and toxic carbon monoxide. Inhaling the gas may lead to loss of health oreven death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.
 The calibration gas used should be a standard gas consisting of carbon monoxide diluted with nitrogen or air.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations will
result in poor sensitivity and inaccurate concentration readings.
 When calibrating carbon monoxide and oxygen at the same time, the calibration gas used should be a standard
gas consisting of carbon monoxide diluted with nitrogen.
 When calibrating carbon monoxide and oxygen separately, the calibration gases used should be a standard gas
consisting of carbon monoxide diluted with nitrogen or air, and nitrogen or a standard gas consisting of oxygen
diluted with nitrogen.
 Do not expose the product to sudden pressure fluctuations. Oxygen readings will fluctuate briefly, preventing
accurate calibration.
Handle the calibration gases and the equipment used for calibration with due care.
 Calibration gases include hazardous gases (e.g., toxic gases, nitrogen gas). Handle with due care.
 Do not apply a load on the GAS OUT end.

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WARNING SO2
Handling the calibration gas
 The calibration gas (sulfur dioxide) is toxic. Inhaling the gas may lead to loss of health or even death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.
 The calibration gas used should be a standard gas consisting of sulfur dioxide diluted with nitrogen or air.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations will
result in poor sensitivity and inaccurate concentration readings.
Handle the calibration gases and the equipment used for calibration with due care.
 Calibration gases include hazardous gases (e.g., toxic gases, nitrogen gas). Handle with due care.

WARNING NO2
Handling the calibration gas
 The calibration gas (nitrogen dioxide) is toxic. Inhaling the gas may lead to loss of health or even death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.
 The calibration gas used should be a standard gas consisting of nitrogen dioxide diluted with air.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations will
result in poor sensitivity and inaccurate concentration readings.
 Use the calibration gas within 30 minutes of preparation.

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Handle the calibration gases and the equipment used for calibration with due care.
 Calibration gases include hazardous gases (toxic gases). Handle with due care.

WARNING HCN
Handling the calibration gas
 The calibration gas (hydrogen cyanide) and substitute gas (phosphine) are toxic. Inhaling the gas may lead toloss of health or even death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.
 The calibration gas used should be a standard gas consisting of hydrogen cyanide diluted with air or phosphine
diluted with nitrogen or air.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations will
result in poor sensitivity and inaccurate concentration readings.
 Remove the CF-A13D-3 when calibrating with substitute gas (phosphine).
Handle the calibration gases and the equipment used for calibration with due care.
 Calibration gases include hazardous gases (e.g., toxic gases, nitrogen gas). Handle with due care.

WARNING PH3
Handling the calibration gas
 The calibration gas (Phosphine) are toxic. Inhaling the gas may lead to loss of health or even death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.
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7. Maintenance7-2. Performing calibration

 The calibration gas used should be a standard gas consisting of Phosphine diluted with nitrogen or air.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations will
result in poor sensitivity and inaccurate concentration readings.
Handle the calibration gases and the equipment used for calibration with due care.
 Calibration gases include hazardous gases (e.g., toxic gases, nitrogen gas). Handle with due care.

WARNING NH3
Handling the calibration gas
 The calibration gas (Ammonia) are toxic. Inhaling the gas may lead to loss of health or even death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.
 The calibration gas used should be a standard gas consisting of Ammonia diluted with nitrogen or air.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations will
result in poor sensitivity and inaccurate concentration readings.
Handle the calibration gases and the equipment used for calibration with due care.
 Calibration gases include hazardous gases (e.g., toxic gases, nitrogen gas). Handle with due care.

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7. Maintenance7-2. Performing calibration

WARNING CL2
Handling the calibration gas
 The calibration gas (Chlorine) are toxic. Inhaling the gas may lead to loss of health or even death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.
 The calibration gas used should be a standard gas consisting of Chlorine diluted with nitrogen or air.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations will
result in poor sensitivity and inaccurate concentration readings.
Handle the calibration gases and the equipment used for calibration with due care.
 Calibration gases include hazardous gases (e.g., toxic gases, nitrogen gas). Handle with due care.

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7-2-2. Displaying the calibration (GAS CAL) screen
Calibration is performed with the calibration function (GAS CAL) in user mode.
The following items can be performed or set with the calibration function (GAS CAL):
Calibration (GAS CAL)
Air calibration (AIR)AUTO calibration (A-CAL)
Performing AUTO calibration (A-CAL)
Measurement start (START)Calibration gas concentration setting (CAL-P)
Cylinder setting (CYL SEL) (CO-04 (C-) and CX-04 only)
ESCAPEESCAPENOTE

 With the power turned off, hold down the AIR button and the POWER/MODE button at the same time (for about
three seconds) to enter user mode. (Refer to ‘6-1. User mode setting procedure’.) Following successful calibration, the product will automatically return to measurement mode.
However, if multiple cylinders are set (CO-04 (C-) and CX-04 only), the product will not automatically return tomeasurement mode.
 Do the following to return to measurement mode from the calibration (GAS CAL) screen:① Press the AIR button several times to select [A-CAL], then press the POWER/MODE button.
② Press the AIR button several times to select [START], then press the POWER/MODE button.
User mode ends. The product will return to measurement mode after performing the same operation as when
the power is turned on.
 To end calibration (GAS CAL), press the AIR button several times to select [ESCAPE], then press the
POWER/MODE button. The display returns to the user mode menu.
 To end AUTO calibration (A-CAL), press the AIR button several times to select [ESCAPE], then press the
POWER/MODE button. The display returns to the calibration (GAS CAL) menu.
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7. Maintenance7-2. Performing calibration

7-2-3. Performing air calibration
WARNING When air calibration is performed in the atmosphere, check the atmosphere for freshness before starting.
The presence of interference gases will prevent proper air calibration. The presence of interference gases is also
extremely dangerous because the product may not detect actual gas leaks correctly.

CAUTION

OX

CO

HS

C-

CX

SO2

NO2 HCN

PH3

CL2

 Perform air calibration in an environment that meets all of the following conditions:・ Pressures, temperatures, and humidity levels are similar to pressures, temperatures, and humidity levels in theactual usage environment.
・ In fresh air
 Wait for the readout to stabilize before performing air calibration.
 If the temperature difference between the storage location and usage location is 15 °C or greater, turn on the
power and allow the product to adjust to ambient conditions similar to those at the usage location for about
10 minutes. After this, air calibrate in fresh air before use.

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7. Maintenance7-2. Performing calibration

CAUTION OX G NH3
 Perform air calibration in an environment that meets all of the following conditions:・ Pressures, temperatures, and humidity levels are similar to pressures, temperatures, and humidity levels in theactual usage environment.
・ In fresh air
 Wait for the readout to stabilize before performing air calibration.
 If the temperature difference between the storage location and usage location is 15 °C or greater, turn on the
power and allow the product to adjust to ambient conditions similar to those at the usage location for about
30 minutes. After this, air calibrate in fresh air before use.
1 Press the AIR button several times in user
mode to select [GAS CAL], then press the
POWER/MODE button.
2 Select [AIR], then press the POWER/MODE
button.
3 Hold down the AIR button.

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7. Maintenance7-2. Performing calibration

4 Release the AIR button once the LCD display
changes from [Air HOLD] to [AdJ RELEASE].
When air calibration succeeds, [PASS] appears.
After air calibration, the current gas concentration
appears, and the display returns to the [AIR]screen.

NOTE If air calibration fails, [FAIL AIR] will appear. Air calibration will not be performed.
Press the POWER/MODE button to reset the fault alarm (calibration abnormality). Resetting the alarm displays
the value before air calibration.

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7. Maintenance7-2. Performing calibration

7-2-4. Performing AUTO calibration
Introduce the calibration gas and perform calibration at the gas concentration set in the calibration gas concentration
setting (CAL-P).

CAUTION
 Air calibration must always be performed before AUTO calibration.

<Performing AUTO calibration (A-CAL)> OX GOX1 Press the AIR button several times in user
mode to select [GAS CAL], then press the
POWER/MODE button.
2 Press the AIR button several times to select[A-CAL], then press the POWER/MODE button.
3 Confirm the name of the gas to calibrate, thenpress the POWER/MODE button.

4 Introduce the calibration gas, wait 60 seconds,
then press the POWER/MODE button.

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7. Maintenance7-2. Performing calibration

AUTO calibration starts.

5 Check the AUTO calibration result.
If AUTO calibration is successful[PASS] appears, followed by the gas concentration
after AUTO calibration.
After this, the product returns automatically tomeasurement mode.
If AUTO calibration fails[FAIL] appears.

<Performing AUTO calibration (A-CAL)>

CO

HS

SO2

NO2

HCN

PH3

NH3

CL2
(Display example: CO-04)

1 Press the AIR button several times in user
mode to select [GAS CAL], then press the
POWER/MODE button.
2 Press the AIR button several times to select[A-CAL], then press the POWER/MODE button.
3 Confirm the name of the gas to calibrate, thenpress the POWER/MODE button.

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7. Maintenance7-2. Performing calibration

4 Introduce the calibration gas, wait 60 seconds*,
then press the POWER/MODE button.
* After 120 seconds in the following cases
・When calibrating SC-04 (NH3).
・When calibrating SC-04 (CL2).
・When HCN is used during SC-04 (HCN)
Calibration. (After 60 seconds when calibratingwith an alternative gas (PH3).
AUTO calibration starts.

5 Check the AUTO calibration result.
If AUTO calibration is successful[PASS] appears, followed by the gas concentration
after AUTO calibration.
After this, the product returns automatically tomeasurement mode.
[FAIL] appears if AUTO calibration fails.

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7. Maintenance<Performing AUTO calibration (A-CAL)>

7-2. Performing calibration
CX (Display example: CX-04)

C-

1 Press the AIR button several times in user
mode to select [GAS CAL], then press the
POWER/MODE button.
2 Press the AIR button several times to select[A-CAL], then press the POWER/MODE button.
3 Press the AIR button to select the cylinder tocalibrate, then press the POWER/MODE button.

4 Introduce the calibration gas, wait 60 seconds,
then press the POWER/MODE button.

AUTO calibration starts.

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7. Maintenance7-2. Performing calibration

5 Check the AUTO calibration result.
If AUTO calibration is successful[PASS] appears, followed by the gas concentration
after AUTO calibration.
After this, the product returns automatically tomeasurement mode.
However, if multiple cylinders are set, the productwill not automatically return to measurement mode.
If AUTO calibration fails[FAIL] appears.

Upper row: [CO] AUTO calibration result
Middle row: [O2] AUTO calibration result

NOTE
 When the quick calibration function is enabled, the AUTO calibration menu display changes to [E-CAL]. Select[E-CAL], then press the POWER/MODE button. After the introduction of the calibration gas, AUTO calibration is
performed by automatically counting down the calibration time set with the quick calibration time setting(E-CAL). (Refer to ‘6-11. Quick calibration time setting (E-CAL)’.)127 / 168

7. Maintenance7-2. Performing calibration<Calibration gas concentration setting (CAL-P)> OX G
NH3

OX

CO

HS

SO2

NO2

HCN

PH3

CL2 (Display example: CO-04)

1 Press the AIR button several times in user
mode to select [GAS CAL], then press the
POWER/MODE button.
2 Press the AIR button several times to select[A-CAL], then press the POWER/MODE button.
3 Press the AIR button several times to select[CAL-P], then press the POWER/MODE button.
4 Confirm the name of the target gas, then press
the POWER/MODE button.
5 Press the AIR button several times to set thecalibration gas concentration, then press the
POWER/MODE button.
[END] appears once the settings are complete. The
display returns to the [CAL-P] (target gas
confirmation) screen.
*With the SC-04 (HCN), the gas name will be indicated as HCN on the screen even when calibrating using substitute gas (PH3).
The HCN calibration gas concentration should be calculated by multiplying the PH3 concentration by the conversion factor.
(HCN concentration = PH3 concentration × conversion factor)

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7. Maintenance7-2. Performing calibration<Calibration gas concentration setting (CAL-P)>

C-

1 Press the AIR button several times in user
mode to select [GAS CAL], then press the
POWER/MODE button.
2 Press the AIR button several times to select[A-CAL], then press the POWER/MODE button.
3 Press the AIR button several times to select[CAL-P], then press the POWER/MODE button.
4 Press the AIR button several times to select thetarget gas, then press the POWER/MODE
button.
CO-04 (C-): Select either [CO] or [H2].
CX-04:
Select either [CO] or [O2].
5 Press the AIR button several times to set thecalibration gas concentration, then press the
POWER/MODE button.
[END] appears once the settings are complete. The
display returns to the [CAL-P] (target gas selection)screen.

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CX

7. Maintenance<Cylinder setting (CYL SEL)>

7-2. Performing calibrationC-

CX

Set gas groups (cylinders) for calibration. Five cylinders can be set as A to E.
The default settings are as follows:
CO-04 (C-): [CO]: A, [H2]: B
CX-04:[CO]: A, [O2]: A

NOTE Under most circumstances, there is no need to change the cylinder setting.
Change the cylinder setting if [CO] (carbon monoxide) and [O2] (oxygen) are to be calibrated separately on the
CX-04.
1 Press the AIR button several times in user
mode to select [GAS CAL], then press the
POWER/MODE button.
2 Press the AIR button several times to select[A-CAL], then press the POWER/MODE button.
3 Press the AIR button.
Pressing the AIR button displays the gas type andconcentration for cylinders A to E in sequence.
4 Press the AIR button several times to select[CYL SEL], then press the POWER/MODE
button.

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7. Maintenance7-2. Performing calibration

5 Press the AIR button several times to select thedetection target gas, then press the
POWER/MODE button.
Pressing the AIR button cycles through thedetection target gases.
CO-04 (C-): [CO] → [H2] → [ESCAPE]
CX-04:[CO] → [O2] → [ESCAPE]
Selecting [ESCAPE] and pressing the
POWER/MODE button returns the display to the
AUTO calibration (A-CAL) screen.
To cancel the cylinder setting, press the AIR button
until [ESCAPE] appears.
6 Press the AIR button several times to select acylinder, then press the POWER/MODE button.
Select from [A] to [E].
[END] appears once the settings are complete. The
display returns to the [CYL SEL] (target gas
selection) screen.

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7. Maintenance7-3. Performing bump tests

7-3. Performing bump tests
Bump tests are performed using the bump test function (BUMP) in user mode.
The bump test (function check) is a test for checking whether the readings are within the acceptable range byintroducing a calibration gas.
As with calibration, prepare the equipment and calibration gases, then connect to this product. (Refer to ‘7-2-1.
Preparation for calibration’.)NOTE With the power turned off, hold down the AIR button and the POWER/MODE button at the same time (for about
three seconds) to enter user mode. (Refer to ‘6-1. User mode setting procedure’.) Following a successful bump test, the product will automatically return to measurement mode.
However, if multiple cylinders are set (CO-04 (C-) and CX-04 only), the product will not automatically return tomeasurement mode.
 To return to measurement mode from the bump test (BUMP) screen, press the AIR button several times toselect [START], then press the POWER/MODE button. User mode ends. The product will return tomeasurement mode after performing the same operation as when the power is turned on.
 To end the bump test (BUMP), press the AIR button several times to select [ESCAPE], then press the
POWER/MODE button. The display returns to the user mode menu.
OX G

OX

1 Press the AIR button several times in user
mode to select [BUMP], then press the
POWER/MODE button.

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7. Maintenance7-3. Performing bump tests

2 Introduce the calibration gas, then press the
POWER/MODE button.
[APLY] and [BUMP] alternate on the display. The
time until the bump test starts is displayed on theright side.
The bump test starts when the remaining timereaches [0].
3 Check the bump test result.
If the bump test is successful[P] appears in the [BMP/CAL] screen. Press the AIR
button to view the reading at the time of the bumptest.
If the bump test fails[F] appears in the [BMP/CAL] screen (left side of
middle row). Press the AIR button to view thereading at the time of the bump test.
After a bump test failure, calibration is performed if
specified in the setting. Once calibration iscomplete, the calibration result is displayed on the[BMP/CAL] screen (right side of middle row), theneach time the AIR button is pressed, the display
shows the reading at the time of the bump test andthe calibration reading.

Left side of middle row:
Bump test result
Right side of middle row:
Calibration result(P: Passed/F: Failed)

4 Press the POWER/MODE button.
[END] appears. If the bump test is successful, theproduct will automatically return to measurementmode.
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(Displayed only ifcalibration was
performed)

7. MaintenanceCOHS

7-3. Performing bump tests

SO2

NO2

HCN

PH3

NH3

CL2 (Display example: CO-04)

1 Press the AIR button several times in user
mode to select [BUMP], then press the
POWER/MODE button.
2 Introduce the calibration gas, then press the
POWER/MODE button.
[APLY] and [BUMP] alternate on the display. The
time until the bump test starts is displayed on theright side.
The bump test starts when the remaining timereaches [0].
3 Check the bump test result.
If the bump test is successful[P] appears in the [BMP/CAL] screen. Press the AIR
button to view the reading at the time of the bumptest.

*With the SC-04 (HCN), the gas name will be indicated as HCN on the screen even when calibrating using substitute gas (PH3).
The HCN concentration at the time of the bump test should be calculated by multiplying the PH3 concentration by theconversion factor. (HCN concentration = PH3 concentration × conversion factor)

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7. Maintenance7-3. Performing bump tests

If the bump test fails[F] appears in the [BMP/CAL] screen (left side of
middle row). Press the AIR button to view thereading at the time of the bump test.
After a bump test failure, calibration is performed if
specified in the setting. Once calibration iscomplete, the calibration result is displayed on the[BMP/CAL] screen (right side of middle row), theneach time the AIR button is pressed, the display
shows the reading at the time of the bump test andthe calibration reading.

Left side of middle row:
Bump test result
Right side of middle row:
Calibration result(P: Passed/F: Failed)

4 Press the POWER/MODE button.
[END] appears. If the bump test is successful, theproduct will automatically return to measurementmode.

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(Displayed only ifcalibration was
performed)

7. MaintenanceC-

CX

7-3. Performing bump tests(Display example: CX-04)

1 Press the AIR button several times in user
mode to select [BUMP], then press the
POWER/MODE button.
2 Press the AIR button several times to select thecylinder for the bump test, then press the
POWER/MODE button.
3 Introduce the calibration gas, then press the
POWER/MODE button.
[APLY] and [BUMP] alternate on the display. The
time until the bump test starts is displayed on theright side.
The bump test starts when the remaining timereaches [0].
4 Check the bump test result.
If the bump test is successful[P] appears in the [BMP/CAL] screen. Press the AIR
button to view the reading at the time of the bumptest.

Upper row: [CO] bump test result
Middle row: [O2] bump test result

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7. Maintenance7-3. Performing bump tests

If the bump test fails[F] appears in the [BMP/CAL] screen (left side).
Press the AIR button to view the reading at the timeof the bump test.
After a bump test failure, calibration is performed if
specified in the setting. Once calibration iscomplete, the calibration result is displayed on the[BMP/CAL] screen (right side), then each time theAIR button is pressed, the display shows thereading at the time of the bump test and thecalibration reading.

Left side of upper row:[CO] bump test result
Right side of upper row:[CO] calibration result
Left side of middle row:
[O2] bump test result
Right side of middle row:
[O2] calibration resul)(P: Passed/F: Failed)(Displayed only ifcalibration was
performed)

5 Press the POWER/MODE button.
[END] appears. If the bump test is successful, theproduct will automatically return to measurement
mode.
However, if multiple cylinders are set, the productwill not automatically return to measurement mode.

NOTE The bump test expiration and the various conditions for bump testing are set in the bump test expiration setting(BUMP.SET) in user mode. (Refer to ‘6-4. Bump test expiration setting (BUMP.SET)’.) After a bump test failure, set the bump test calibration ON/OFF (A-CAL) setting to ON to perform calibration
after the bump test. (Refer to ‘6-4-1. Bump test setting (SETTING)’.)

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7. Maintenance7-4. Performing alarm tests

7-4. Performing alarm tests
By pressing the AIR button and the POWER/MODE button at the same time while displaying any of the alarm
setpoints in the alarm setpoint display of display mode, you can test the relevant alarm.
1 Press the POWER/MODE button inmeasurement mode.
The buzzer blips once, and the product switches todisplay mode.
2 Press the POWER/MODE button several times
to select the alarm setpoint display[dISP ALARM-P].
3 Press the AIR button several times to select thealarm setpoint for the alarm test.
Pressing the AIR button cycles through the alarm
setpoints.
For the alarm setpoints displayed, see ‘5-6-2. Items
displayed in display mode’.
4 Press the AIR button and the POWER/MODE
button at the same time.
This activates the selected alarm setpoint alarm.
Press the POWER/MODE button to reset the alarm.

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7. Maintenance7-4. Performing alarm tests

NOTE
 For information on the alarm patterns at the different alarm setpoints, see ‘4-2. Gas alarm activation’.
 The gas concentration on the LCD display will not blink in alarm tests.
 To end display mode, press the POWER/MODE button, select the buzzer volume setting screen, then press the
POWER/MODE button. When the display mode item display setting (DISP.SET) is OFF, the buzzer volume
setting screen is not displayed. Press the POWER/MODE button in the alarm setpoint display (dISP ALARM-P)
screen.

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7. Maintenance7-5. Cleaning instructions

7-5. Cleaning instructions
Clean the product if it becomes excessively dirty.
Be sure to turn off the power before cleaning. Wipe clean using a cloth or rag soaked in water and firmly wrung out.
Do not clean using water, organic solvents, or commercially available cleaners for cleaning, as these may cause theproduct to malfunction.

CAUTION When wiping the product clean, do not splash water on it or use organic solvents like alcohol and benzene orcommercially available cleaners.
These may discolor or damage the surface of the product, or cause the sensor to malfunction.

NOTE
 Water may remain in the buzzer sound opening or grooves if the product gets wet. Remove any moisture as
follows:① Wipe off any moisture on the product using a dry towel or cloth.
② Hold the product firmly and shake about 10 times with the buzzer sound opening facing downward.
③ Use a towel or cloth to wipe up all moisture drained from the interior.
④ Place the product on a dry towel or cloth and allow to stand at room temperature.

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7. Maintenance7-6. Parts replacement

7-6. Parts replacement
For information on parts replacement, please contact Riken Keiki. A functional check by a qualified service engineer isalso required after parts replacement.
For more information, contact Riken Keiki.

7-6-1. Periodic replacement parts
Listed below are the product’s consumable parts. Replace the consumable parts based on the recommended
replacement intervals.

<Recommended replacement parts list>
Name
O2 sensor (OS-BM2 C)
O2 sensor (ESR-X13P)H2S sensor (ESR-A13i)
CO sensor (ESR-A13P)
CO sensor（ESR-A1CP）
CO/O2 sensor (ESR-X1DP)SO2 sensor (ESR-A13D)
NO2 sensor (ESR-A13D)HCN sensor (ESR-A13D)
PH3 sensor (ESR-A13D)
NH3 sensor (ESR-B134)
CL2 sensor (ESR-B136)

Recommended
check interval
6 months
6 months
6 months
6 months
6 months
6 months
6 months
6 months
6 months
6 months
6 months
6 months

Recommended
replacement interval
1 year
3 years
3 years
3 years
3 years
3 years
3 years
3 years
3 years
3 years
1 years
1 years

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Quantity(piece/unit)
1
1
1
1
1
1
1
1
1
1
1
1

Remarks
Sensor for OX-04G
Sensor for OX-04
Sensor for HS-04
Sensor for CO-04
Sensor for CO-04 (C-)
Sensor for CX-04
Sensor for SC-04 (SO2)Sensor for SC-04 (NO2)Sensor for SC-04 (HCN)
Sensor for SC-04 (PH3)
Sensor for SC-04 (NH3)
Sensor for SC-04 (CL2)7. Maintenance

Name
Dust filter (built-in)
Humidity control filter(CF-A13i-1)
Humidity control filter(CF-B134-1)
Interference gas removal
filter(CF-6280)
H2S removal filter(CF-A13D-1)
H2S removal filter(CF-A13D-3)
H2S removal filter(CF-A13D-5)

SpacerRubber seal for switch
Rubber seal for upper andlower cases
Rubber seal for battery cover
Rubber seal for sensor
AAA alkaline batteries

7-6. Parts replacement
Recommended
check interval

Recommended
replacement interval
6 months or when
Before and after use
contaminatedQuantity(piece/unit)

Remarks

1

Not used for SC-04 (CL2).

3 months

6 months

1

Filter for HS-04, SC-04(PH3)3 months

6 months

1

Filter for SC-04(NH3)3 months

6 months

1

Filter for CO-04/CO-04 (C-)/
CX-04

3 months

6 months

1

Filter for SC-04 (NO2)

3 months

6 months

1

Filter for SC-04 (HCN)

3 months

6 months

1

Filter for SC-04 (SO2)

1

For SC-04 (CL2)-

6 months or whencontaminated
3 to 6 years

1-

3 to 6 years

1-

3 to 6 years
3 to 6 years
-

1
1
2

Before and after use

Dry cell specifications
Rechargeable battery
AAA Ni-MH batteries
2
specifications* A functional check must be performed by a qualified service engineer after parts replacement to ensure safety and the stable operation of
the product. Contact Riken Keiki to request a functional check.

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7. Maintenance7-6. Parts replacement

NOTE
 The above replacement intervals are guidelines. Replacement intervals may vary depending on actual
operating conditions. In addition, these intervals do not constitute warranty periods. Replacement intervals mayvary depending on the results of regular maintenance.

7-6-2. Filter replacement
OX G

OX

The dust filter is a consumable. Check the extent of the contamination and replace periodically at appropriate intervals.
1 Turn off the power.
Hold down the POWER/MODE button for at least
three seconds to turn off the power.
2 Remove the rubber protection cover.

Screws3 Position with the display facing down, thenloosen the four screws with a Phillips headscrewdriver.
4 Position with the display facing up. Remove
the upper case.

Screws

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Upper case

7. Maintenance7-6. Parts replacement

5 Remove the rubber seal and dust filter from theupper case.

Rubber seal
Dust filter

6 Replace the dust filter.
Rubber seal

7 Attach the rubber seal.
Refer to the diagram at right and note theorientation of the rubber seal when fitting.

Sensor side
Upper case side

8 Return the upper case to its original position.
Tighten the four screws with the Phillips headscrewdriver.
Tighten the screws to a torque of 15 to 16 N∙cm with
the Phillips head screwdriver.
9 Attach the rubber protection cover.

CAUTION Replace filters approximately every six months.
 Replace filters promptly (within 10 minutes).
 Handle filters carefully. Do not use this product with damaged filters.

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7. MaintenanceCOHS

7-6. Parts replacement
C-

CX

SO2

NO2

HCN

PH3

NH3

The dust filter and filter are consumables. Check the extent of the contamination and replace periodically at appropriate
intervals.
The filter types are as follows: HS-04, SC-04(PH3):
Humidity control filter CF-A13i-1
 SC-04(NH3):
Humidity control filter CF-B134-1
 CO-04(C-), CO-04(C-), CX-04: Interference gas removal filter CF-6280
 SC-04 (NO2):
H2S removal filter CF-A13D-1
 SC-04 (HCN):
H2S removal filter CF-A13D-3
 SC-04 (SO2):
H2S removal filter CF-A13D-5
1 Turn off the power.
Hold down the POWER/MODE button for at least
three seconds to turn off the power.
2 Remove the rubber protection cover.
3 Position with the display facing down, thenloosen the four screws with a Phillips headscrewdriver.

Screws4 Position with the display facing up. Remove theupper case.

Screws145 / 168

Upper case

7. Maintenance7-6. Parts replacement

5 Remove the filter, rubber seal, and dust filter
from the upper case.

FilterRubber seal
Dust filter

6 Replace the dust filter.
7 Attach the rubber seal.
Refer to the diagram at right and note theorientation of the rubber seal when fitting.

Rubber seal
Sensor side

8 Replace the filter.
9 Return the upper case to its original position.
Tighten the four screws with the Phillips headscrewdriver.
Tighten the screws to a torque of 15 to 16 N∙cm with
the Phillips head screwdriver.

Upper case side
Filter

10 Attach the rubber protection cover.

CAUTION Chemicals have been applied to the CF-A13i-1 humidity control filter, CF-B134-1 humidity control filter,
CF-A13D-1 H2S removal filter, and CF-A13D-3 H2S removal filter. To replace the filters, grasp with tweezers.
Work carefully to avoid damaging the filters or touching with bare hands. Wash your hands immediately if theycome into contact with the chemicals.
 Replace filters approximately every six months.
 Replace filters promptly (within 10 minutes).
 Handle filters carefully. Do not use this product with damaged filters.

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7. Maintenance7-6. Parts replacement

 Cracking may appear on the surface of the CF-A13D-3. This does not affect functionality. Do not use if fragments
become detached.

CL2
The spacer is consumables. Check the extent of the contamination and replace periodically at appropriate intervals.
1 Turn off the power.
Hold down the POWER/MODE button for at least
three seconds to turn off the power.

ScrewsUpper case

2 Remove the rubber protection cover.
3 Position with the display facing down, thenloosen the four screws with a Phillips headscrewdriver.

Screws4 Position with the display facing up. Remove theupper case.

Rubber seal
spacer

5 Remove rubber seal and spacer from the upper
case.

Rubber seal

6 Replace the spacer.
Sensor side

7 Attach the rubber seal.
Refer to the diagram at right and note theorientation of the rubber seal when fitting.

Upper case side
Filter147 / 168

7. Maintenance7-6. Parts replacement

8 Return the upper case to its original position.
Tighten the four screws with the Phillips headscrewdriver.
Tighten the screws to a torque of 15 to 16 N∙cm with
the Phillips head screwdriver.
9 Attach the rubber protection cover.

CAUTION
Chemicals have been applied to the CF-A13i-1 humidity control filter and the CF-B134-1 humidity control filter andthe CF-A13D-1 H2S removal filter and the CF-A13D-5 H2S removal filter. When replacing the filters, hold withtweezers. Work carefully to avoid damaging the filters or touching with bare hands. Wash your hands immediately
if they come into contact with the chemical.
 Replace the spacer approximately every six months.
 Replace the spacer promptly (within 10 minutes).
 Handle the spacer carefully. Do not use this product with damaged the spacer.
 CF-A13D-3 may have cracks on the surface, but these are not a problem for use. If pieces detach from thesurface Do not use.

NOTE The interval for replacing the filters (six months) is a guideline value. Actual intervals may vary depending on
operating conditions. These intervals do not constitute warranty periods. The replacement timing may varydepending on the results of daily and regular maintenance.
 Be sure to turn off the power for the product before replacing the filters.
 The rubber seals also contain filters. Handle with care, as they are easily damaged.
 When assembling the upper case, make sure no foreign matter is trapped in the rubber seal around the uppercase.

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7. Maintenance7-6. Parts replacement

7-6-3. Sensor replacement
The sensor needs to be replaced if you encounter symptoms like failure to restore readings after air calibration or
fluctuating readings when performing calibration. Contact Riken Keiki for replacement.
OX G
1 Turn off the power.
Hold down the POWER/MODE button for at least
three seconds to turn off the power.
2 Remove the rubber protection cover.

Upper caseScrews3 Position with the display facing down, thenloosen the four screws with a Phillips headscrewdriver.
4 Position with the display facing up. Remove theupper case.

Screws5 Replace the sensor.
Insert the sensor fully.

Sensor

6 Return the upper case to its original position.
Tighten the four screws with the Phillips headscrewdriver.
Tighten the screws to a torque of 15 to 16 N∙cm with
the Phillips head screwdriver.
7 Attach the rubber protection cover.
149 / 168

7. MaintenanceOX

CO

7-6. Parts replacement
HS

C-

CX

SO2

NO2 HCN PH3

NH3

CL2

1 Turn off the power.
Hold down the POWER/MODE button for at least
three seconds to turn off the power.
2 Remove the rubber protection cover.

Screws3 Position with the display facing down, thenloosen the four screws with a Phillips headscrewdriver.
4 Position with the display facing up.
Remove the upper case.

Upper caseScrews5 Replace the sensor.
Match the △ marks on the sensor to the matching
locations on the sensor case, then insert the sensor
fully.

SensorLocations to match when
fitting the sensor(CO-04/HS-04/
SC-04 (SO2, NO2, HCN, PH3,
NH3, CL2))150 / 168

Locations to match
when fitting the sensor(OX-04, CX-04)

7. Maintenance7-6. Parts replacement

6 Return the upper case to its original position.
Tighten the four screws with the Phillips headscrewdriver.
Tighten the screws to a torque of 15 to 16 N∙cm with
the Phillips head screwdriver.
7 Attach the rubber protection cover.

NOTE The rubber seals also contain filters. Handle with care, as they are easily damaged.
 When assembling the upper case, make sure no foreign matter is trapped in the rubber seal around the uppercase.

151 / 168

8. Storage and Disposal

8-1. Procedures for storage or when not in use for extended periods

8

Storage and Disposal
8-1. Procedures for storage or when not in use for extended periods
The product must be stored in the following environment: In a dark place at normal temperatures and humidity and away from direct sunlight In a place free of gases, solvents, and vapor
Store the product in its shipping carton, if retained and available. If the shipping carton is not available, store away fromdust and dirt.

CAUTION If the product is not to be used for extended periods, store with the battery removed. Battery leaks may result infire or injury.

<Procedure for reuse>
Perform calibration if the product is used again after a period in storage. (Refer to ‘3-3. Inserting the batteries’,‘7-2. Performing calibration’.)

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8. Storage and Disposal

8-2. Product disposal

8-2. Product disposal
Dispose of the product as industrial waste (incombustible) in accordance with local regulations.

WARNING Dispose of batteries in accordance with procedures specified by local authorities.

<Disposal in EU member states>
When disposing of the product in an EU member state, dispose of the batteries separately.
The batteries must be removed and disposed of appropriately in accordance with waste sorting and collection or
recycling systems stipulated by the regulations of EU member states.

NOTE
Crossed-out recycle dustbin markThe pictogram at right indicates that batteries must be separated from ordinary waste and disposedof appropriately.
This is affixed to products containing batteries to which EU Battery Directive 2006/66/EC applies.
Such batteries must be disposed of appropriately.

153 / 168

9. Troubleshooting

9-1. Product abnormalities

9

Troubleshooting
9-1. Product abnormalities
Symptom

Cause

Corrective action

The batteries are depleted.

Turn off the power and replace with new batteries in asafe place.
(Refer to ‘3-3. Inserting the batteries’.)

The batteries were insertedwith polarity reversed.

Reinsert the batteries correctly.
(Refer to ‘3-3. Inserting the batteries’.)

The POWER/MODE button
was pressed too briefly or
for too long.

To turn the power on, hold down the POWER/MODE
button for at least three seconds until the buzzer blips
once.
(Refer to ‘5-3. Turning on the power’.)The battery cover is not
closed completely.

Close the battery cover completely.

System abnormality:[FAIL SYSTEM] appears.

A circuit abnormality
occurred in the main unit.

Contact Riken Keiki for repair.

Sensor abnormality:[FAIL SENSOR] appears.

The sensor sensitivity has
degraded.

Contact Riken Keiki to request sensor replacement.
(Refer to ‘7-6-3. Sensor replacement’.)

The power cannot be
turned on.

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9. Troubleshooting
Symptom
Low battery voltage alarm:[FAIL BATTERY] appears.
Air calibration is notpossible.
[FAIL AIR] appears.

Clock abnormality:[FAIL CLOCK] appears.

The alarm does not stopeven after gas
concentrations fall below
the alarm setpoint.
System abnormality:[FAIL 031 SYSTEM]
appears.

9-1. Product abnormalities
Cause

Corrective action

Battery levels are low.

Turn off the power and replace with new batteries in asafe place.
(Refer to ‘3-3. Inserting the batteries’.)Fresh air is not being
supplied to the product.

Supply fresh air around the product.

The sensor sensitivity has
degraded.

Contact Riken Keiki to request sensor replacement.
(Refer to ‘7-6-3. Sensor replacement’.)

Internal clock abnormality

Set the date and time.
(Refer to ‘6-12. Date and time setting (DATE)’.)
If this occurs frequently, the internal clock may be faulty.
Contact Riken Keiki to request internal clock
replacement.

You did not press the
POWER/MODE button.

For OX-04G, OX-04, HS-04, SC-04 (SO2, NO2, HCN,
PH3, NH3, CL2)
The product alarms are self-latching. After the alarm
occurs, press the POWER/MODE button.
For CO-04, CO-04 (C-), CX-04
If the gas alarm pattern is self-latching, press the
POWER/MODE button after the alarm occurs.

FLASH memory abnormal

If the abnormality is still displayed after turning thepower off and on five times or more, contact yourdealer or our nearest sales office for repair.

155 / 168

9. Troubleshooting
Symptom[M-LIMIT] appears.

[CAL-LMT] appears.

[BP-LMT] appears.

9-1. Product abnormalities
Cause

Corrective action

Calibration notification
display* Japan Ex specification
onlyThis is the operation when the calibration cycle isreached. After the calibration notice is displayed, It is
possible to proceed to the measurement mode bypressing the AIR button. However, be sure to contact
your dealer or nearest sales office for maintenance.
* In the case of standard setting.

Calibration expiration
display* ATEX/IECEx specification
only

Calibration expired operation. After the calibration
expiration is displayed, press the POWER/MODE
button to proceed to AUTO calibration, or press the AIR
button to proceed to measurement mode, but please
perform calibration by yourself or ask your dealer ornearest sales office to perform maintenance.
* Operation after calibration expires: default setting.

Bump test expiration
display

Bump test expired operation. After the bump test
expiration is displayed, press the POWER/MODE
button to proceed to the bump test. Press AIR button to
go to measurement mode, but be sure to performbump test.
* Operation after bump test expires: default setting.

NOTE This troubleshooting section does not address all problems that may occur with the product. Brief explanationsof causes and corrective actions have been provided to help correct common problems that may occur
frequently. If problems persist even after taking the corrective actions suggested here or if you encounter
symptoms not listed here, contact Riken Keiki.

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10. Product Specifications

10-1. Common specifications

10

Product Specifications
10-1. Common specifications
display

LCD digital display (segments + icons)

Sampling method

Diffusion typeGas alarm

Three-step alarm, STEL alarm, integrated (for CO specification only, Japan Ex
specification only) or TWA alarm, OVER alarm

Fault alarm

Sensor connection/disconnection, low battery voltage, faulty calibration, clock abnormality,
system abnormality

Alarm indications

Flashing lamp, intermittent buzzer sounding, gas concentration display blinking, vibration

Power source

Dry cell specifications: AAA alkaline battery × 2
Rechargeable battery specifications: AAA Ni-MH battery (eneloop) × 2

Protection level

IP66/67 equivalent

Explosion-proof
construction

Intrinsically safe explosion-proof construction

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10. Product Specifications
Explosion-proof class

10-1. Common specifications<Dry cell specifications>
Explosion-proof electrical equipment type certified:
ATEX:
II 1 G Ex ia IIC T4 Ga
IECEx:
Ex ia IIC T4 Ga<Rechargeable battery specifications>
Explosion-proof electrical equipment type certified:
ATEX:
II 1 G Ex ia IIC T3 Ga
IECEx:
Ex ia IIC T3 Ga

Ex ia IIC T4 Ga

Ex ia IIC T3 Ga

Certifications

Explosion-proof electrical equipment type certified, ATEX, IECEx

External dimensions

Approx. 54 mm (W) × 67 mm (H) × 24 mm (D) (excluding projections)

WeightApprox. 93 g (including batteries)

Functions

Data logger, vibration, STEL alarm, integrated (for CO specification only, Japan Ex
specification only) or TWA alarm, quick calibration, PEAK value display, temperature
display

158 / 168

10. Product Specifications

10-2. Specifications by model

10-2. Specifications by model
Model

OX-04G

OX-04

HS-04

CO-04

Detection target gas

OxygenOxygenHydrogen sulfide

Carbonmonoxide

Detection principle

Galvanic cell
type

Display nameSensor modelO2
OS-BM2 C

Display range(resolution)

CO-04 (C-)
Carbon monoxide*3(reduced hydrogeninterference)

CX-04
Carbon monoxide

OxygenCO

O2Electrochemical typeO2
ESR-X13P

0.0 to 40.0 % (0.1)

H2S
ESR-A13i
0.0 to 30.0 ppm (0.1)
30.0 to 200.0 ppm
(1.0)

CO
ESR-A13PCO
ESR-A1CP

0 to 300 ppm (1)300 to 2,000 ppm (10)ESR-X1DP
0 to 300 ppm (1)0.0 to 40.0 % (0.1)
300 to 2,000 ppm(10)Detection range(Japan specification)

0.0 to 25.0 %0.0 to 30.0 ppm

0 to 500 ppm

0 to 500 ppm

0.0 to 25.0 %Detection range(Export specification)

0.0 to 25.0 %0.0 to 100.0 ppm

0 to 500 ppm

0 to 500 ppm

0.0 to 25.0 %Alarm setpoints(Japan standard)

L
LL
H
OVER

18.0 %
18.0 %
25.0 %
40.0 %

1st
2nd
3rd
TWA
STEL
OVER

1.0 ppm
10.0 ppm
10.0 ppm
1.0 ppm
5.0 ppm
200.0 ppm

1st
50 ppm2nd
150 ppm
3rd
150 ppm
Integrated 150 ppm
STEL
200 ppm
OVER 2,000 ppm

1st
50 ppm2nd
150 ppm
3rd
150 ppm
Integrated 150 ppm
STEL
200 ppm
OVER 2,000 ppm

L
LL
H
OVER

18.0 %
18.0 %
25.0 %
40.0 %

Alarm setpoints(Export standard)

L
LL
H
OVER

18.0 %
18.0 %
25.0 %
40.0 %

1st
2nd
3rd
TWA
STEL
OVER

5 ppm
30.0 ppm
100.0 ppm
1.0 ppm
5.0 ppm
200.0 ppm

1st
25 ppm2nd
50 ppm3rd
1,200 ppm
TWA
25 ppm
STEL
200 ppm
OVER 2,000 ppm

1st
25 ppm2nd
50 ppm3rd
1,200 ppm
TWA
25 ppm
STEL
200 ppm
OVER 2,000 ppm

L
LL
H
OVER

18.0 %
18.0 %
25.0 %
40.0 %

159 / 168

10. Product Specifications
Alarm permitted setting
range
Response time*1(T90)

Alarm reset operation

10-2. Specifications by model

L/LL 0.0 to 20.0 %H 21.8 to 40.0 %Within20 seconds(Typical:
9 seconds)

Within20 seconds(Typical:
8 seconds)

Self-latching

Operating temperature
range(no sudden changes)−20 °C to+50 °COperating humidity range(no condensation)

10 to 90 %RH

20 to 2,000 ppm

L/LL 0.0 to 20.0 %H 21.8 to 40.0 %Within30 seconds(Typical:
17 seconds)

Within 30 seconds(Typical: 7 seconds)

Within 30 seconds(Typical:
15 seconds)

Japan specification: Auto reset
Export specification: Self-latching

Japan specification:
Auto reset
Export specification:
Self-latching

Self-latching

1.0 to 200.0 ppm
Within 30 seconds(Typical 18 seconds)

Self-latching

20 to 2,000 ppm
Within30 seconds(Typical:
6 seconds)−40 °C to +60 °C (under temporary use environment for approx. 15 minutes)−20 °C to +50 °C (under continuous use environment)
0 to 95 %RH (under temporary use environment for approx. 15 minutes)
10 to 90 %RH (under continuous use environment)

Operating pressure range

80 kPa to 120 kPa (80 kPa to 110 kPa for explosion-proof range)

Applicable JIS standards

JIS T 8201:
2010-

JIS T 8205: 2018

Continuous operatingtime*2(Alkaline batteries)

Approx.
9,000 hours

Approx. 3,000
hours

Approx.
9,000 hours

Approx.
9,000 hours

Approx.
6,200 hours

Approx. 4,600 hours

Continuous operatingtime*2(Ni-MH batteries)

Approx.
6,000 hours

Approx. 2,000
hours

Approx.
6,000 hours

Approx.
6,000 hours

Approx.
4,200 hours

Approx. 3,000 hours-*1 Typical indicates an average value.
*2 25 °C, no alarm, no lighting*3 The carbon monoxide sensor (ESR-A1CP) includes a correction function to reduce interference due to hydrogen. This function
works for hydrogen concentrations up to 2,000 ppm. (However, if used in an environment exceeding 40°C for more than 15
minutes, it may be affected by hydrogen interference and may indicate a higher carbon monoxide concentration than actual.)

160 / 168

10. Product Specifications
Model
Detection target gas
Detection principle
Display nameSensor model
Display range(resolution)
Detection range(Japan specification)
Detection range(Export specification)

Alarm setpoints(Japan standard)

Alarm setpoints(Export standard)

Alarm permitted
setting range
Response time*1(T90)
Alarm reset operation

10-2. Specifications by model

SC-04 (SO2)
Sulfur dioxide

SC-04 (NO2)
Nitrogen dioxide

SC-04(NH3)Ammonia

SC-04(CL2)
Chlorine

NO2
ESR-A13D
0.00 to 20.00 ppm(0.05)

SC-04 (HCN)
SC-04(PH3)
Hydrogen cyanide
Phosphine
Electrochemical typeHCN
PH3
ESR-A13D
ESR-A13D2
0.0 to 30.0 ppm*3
0.00 to 20.00 ppm(0.1)(0.01)SO2
ESR-A13D
0.00 to 100.00 ppm(0.05)NH3
ESR-B134
0.0 to 400.0ppm
(0.5)

CL2
ESR-B136
0.00 to 20.00ppm(0.05)

0.00 to 20.00 ppm

0.00 to 20.00 ppm

0.0 to 30.0 ppm*3

0.00 to 20.00 ppm

0.0 to 300.0ppm

0.00 to 10.00ppm

0.00 to 20.00 ppm

0.00 to 20.00 ppm

0.0 to 30.0 ppm*3

0.00 to 20.00 ppm

0.0 to 300.0ppm

0.00 to 10.00ppm

1st
2nd
3rd
TWA
STEL
OVER
1st
2nd
3rd
TWA
STEL
OVER

2.00 ppm 1st
5.00 ppm 2nd
5.00 ppm 3rd
2.00 ppm TWA
5.00 ppm STEL
100.00 ppm OVER
2.00 ppm 1st
5.00 ppm 2nd
100.00 ppm 3rd
2.00 ppm TWA
5.00 ppm STEL
100.00 ppm OVER

3.00 ppm 1st
6.00 ppm 2nd
6.00 ppm 3rd
3.00 ppm TWA
5.00 ppm STEL
20.00 ppm OVER
2.00 ppm 1st
4.00 ppm 2nd
20.00 ppm 3rd
0.50 ppm TWA
1.00 ppm STEL
20.00 ppm OVER

0.50 to 100.00 ppm

0.50 to 20.00 ppm

0.9 to 30.0 ppm

Within 30 seconds(Typical: 9 seconds)

Within 30 seconds(Typical: 6 seconds)

Within 90 seconds(Typical: 36 seconds)−40 °C to +60 °C(under temporary use environment forOperatingtemperature range
approx. 15 minutes)(no sudden changes) −20 °C to +50 °C(under continuous use environment)
Operating humidity
range(no condensation)

4.7 ppm
9.4 ppm
9.4 ppm
0.9 ppm
4.5 ppm
30.0 ppm
10.0 ppm
20.0 ppm
30.0 ppm
0.9 ppm
4.5 ppm
30.0 ppm

1st
2nd
3rd
TWA
STEL
OVER
1st
2nd
3rd
TWA
STEL
OVER

0.30 ppm
0.60 ppm
0.60 ppm
0.30 ppm
1.00 ppm
20.00 ppm
0.30 ppm
0.60 ppm
1.00 ppm
0.30 ppm
1.00 ppm
20.00 ppm

0.05 to 20.00

Within 30 seconds(Typical: 6 seconds)
Self-latching−20 °C to +60 °C−40 °C to +60 °C(under temporary use (under temporary use
environment forenvironment for
approx. 15 minutes)
approx. 15 minutes)−20 °C to +50 °C−20 °C to +50 °C(under continuous(under continuous use
use environment)
environment)

1st
2nd
3rd
TWA
STEL
OVER
1st
2nd
3rd
TWA
STEL
OVER

25.0ppm
35.0ppm
35.0ppm
25.0ppm
35.0ppm
400.0ppm
25.0ppm
50.0ppm
300.0ppm
25.0ppm
35.0ppm
400.0ppm

0.40ppm
0.80ppm
0.80ppm
0.50ppm
1.00ppm
20.00ppm
1.00ppm
2.00ppm
10.00ppm
0.50ppm
1.00ppm
20.00ppm

8.0 to 400.0ppm

0.15 to 20.00ppm

Within 90 seconds(Typical: 30 seconds)

Within 90 seconds(Typical: 36 seconds)−30 °C to +50 °C(under temporary use
environment for
approx. 15 minutes)−20 °C to +50 °C(under continuous use
environment)−40 °C to +60 °C(under temporary use
environment for
approx. 15 minutes)−20 °C to +50 °C(under continuous use
environment)

0 to 95 %RH (under temporary use environment for approx. 15 minutes)
10 to 90 %RH (under continuous use environment)

161 / 168

1st
2nd
3rd
TWA
STEL
OVER
1st
2nd
3rd
TWA
STEL
OVER

10. Product Specifications
Operating pressure
rangeContionuos
operating time*2(Alkaline batteries)
Continuous
operating time*2(Ni-MH batteries)

10-2. Specifications by model
80 kPa to 120 kPa (80 kPa to 110 kPa for explosion-proof range)
Approx. 3,000 hours
Approx. 2,000 hours*1 Typical indicates an average value.
*2 25 °C, no alarm, no lighting*3 The SC-04 (HCN) indicates 0.0 ppm between 0.0 and 0.2 ppm.

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11. Appendix

11-1. Data logger function

11

Appendix11-1. Data logger function
The product is equipped with a data logger function that records measurement results and events such as gas alarms,
fault alarms, and calibration.

NOTE
 The data logger management program (sold separately) is required to check data recorded using the datalogger function. Contact Riken Keiki for more information.
The data logger has the following five functions:(1) Interval trend
Records changes in measured concentration from the time the power is turned on until it is turned off.
The average value, PEAK value, and PEAK value detection time are recorded for toxic gas. The average value,
minimum value, minimum value detection time, maximum value, and maximum value detection time are recorded foroxygen.
Records/retains the most recent 3,600 data items.
If the number of items exceeds 3,600, new data will overwrite the oldest data.
If 3,600 items are recorded for a single measurement, the oldest data will not be overwritten, and recording will stop.
However, if the maximum recording time is exceeded, new data will overwrite the oldest data, even if the number ofdata items is less than 3,600.
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11. Appendix

11-1. Data logger function

The maximum recording times corresponding to different intervals are as follows:
Interval
Maximum
recording time

10 seconds 20 seconds 30 seconds

1 minute

3 minutes

5 minutes

10 minutes

10 hours

60 hours

180 hours

300 hours

600 hours

20 hours

30 hours*The standard interval is five minutes. The interval can be set using the data logger management program (sold separately).

(2) Alarm trend
When an alarm is triggered, this function records the changes in measured concentration for 30 minutes before andafter the alarm occurred (one hour in total).
Alarm trend records PEAK values (minimum values for oxygen) over 5-second periods at 5-second intervals.
Records/retains the most recent eight data items.
If the number of items exceeds eight, new data will overwrite the oldest data.

(3) Alarm event
Records alarm occurrences as events.
This function records the time an alarm was triggered, the measurement target gas, and the type of alarm event.
Records/retains the most recent 100 data items.
If the number of items exceeds 100, new data will overwrite the oldest data.

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11. Appendix

11-1. Data logger function(4) Trouble event
Records fault alarm occurrences as events.
This function records the time a fault alarm was triggered, the measurement target gas, device information, and thetype of trouble event.
Records/retains the most recent 100 data items.
If the number of items exceeds 100, new data will overwrite the oldest data.

(5) Calibration history
Records data when calibration is performed.
This function records calibration time, concentration values before and after calibration, and calibration errors.
Records/retains data items for the most recent 100 calibrations.
If the number of calibrations exceeds 100, new data will overwrite the oldest data.

NOTE Communication mode will start automatically if the power is turned on, the date and time or battery level/alarm
pattern is displayed, and the product infrared communication port faces in a direction that enables IrDA
communication. You can also enter communication mode by pressing the AIR and POWER/MODE buttons at
the same time with the product infrared communication port facing in a direction that enables IrDA
communication.
 A fault alarm will be triggered if no communication connection can be confirmed for a preset duration incommunication mode. If this occurs, either repeat the attempt to establish a communication connection or turnoff the power for the product.

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11. Appendix

11-2. Terminology

11-2. Terminology
ppm

Indicates gas concentration in units of parts per million by volume.

%

Indicates gas concentration in units of parts per hundred by volume.

Calibration

Determining correlation between product readout values, display values, and setting values
with actual values using calibration gas

Integrated value

This is the time-weighted average for one hour.
The duration for which the gas has been present is multiplied by the carbon monoxide
concentration value. After the sum of this result (value) is calculated, it is divided by the
number of hours to provide the exposure amount per hour.

TWA

Acronym for Threshold Limit Value Time Weighted AverageTime-weighted average concentrations of a harmful substance considered to have noadverse health effects in nearly all workers, even with repeated exposure, during normal
work for 8 hours per day or 40 hours per week

STEL

Acronym for Threshold Limit Value Short Term Exposure Limit
Concentrations of a harmful substance considered to have no adverse health effects inworkers, even with continuous exposure for 15 minutes, provided daily exposure does notexceed the TWA

Self-latching

Configuration in which an alarm persists, once triggered, unless reset, even when alarm
conditions no longer apply

Auto reset

Configuration in which an alarm stops automatically after being triggered when alarm
conditions no longer apply

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11. Appendix

11-3. Limited Warranty and Limitation Liability

11-3. Limited Warranty and Limitation Liability
RIKEN KEIKI CO.,LTD. (RIKEN) warrants the product to be free from defects in material and workmanship undernormal use and service for a period of the number of years to be listed in "Table: List of warranty years", beginning on
the date of shipment to the buyer. This warranty extends only to the sale of new and unused products to the original
buyer. RIKEN’s warranty obligation is limited, at RIKEN’s option, to repair or replacement of a defective product that isreturned to a RIKEN KEIKI Quality control center located in Japan within the warranty period. In no event shall RIKEN’s
liability hereunder exceed the purchase price actually paid by the buyer for the Product.
This warranty does not include:a) fuses, disposable batteries or the routine replacement of parts due to the normal wear and tear of the product arisingfrom use;b) any product which in RIKEN’s opinion, has been misused, altered, neglected or damaged, by accident or abnormal
conditions of operation, handling or use;c) any damage or defects attributable to repair of the product by any person other than an authorized dealer, or the
installation of unapproved parts on the product; or
The obligations set forth in this warranty are conditional on:a) proper storage, installation, calibration, use, maintenance and compliance with the product manual instructions andany other applicable recommendations of RIKEN;b) the buyer promptly notifying RIKEN of any defect and, if required, promptly making the product available forcorrection. No goods shall be returned to RIKEN until receipt by the buyer of shipping instructions from RIKEN; andc)the right of RIKEN to require that the buyer provide proof of purchase such as the original invoice, bill of sale or
packing slip to establish that the product is within the warranty period.
THE BUYER AGREES THAT THIS WARRANTY IS THE BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN
LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIEDWARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. RIKEN SHALL NOT BE
LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR BASED ON CONTRACT, TORT OR RELIANCE OR ANYOTHER THEORY.

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11. Appendix

11-3. Limited Warranty and Limitation Liability

Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation ofincidental or consequential damages, the limitations and exclusions of this warranty may not apply to every buyer. If
any provision of this warranty is held invalid or unenforceable by a court of competent jurisdiction, such holding will notaffect the validity or enforceability of any other provision.
Contacting RIKEN KEIKI
Email us at: intdept@rikenkeiki.co.jp
Visit RIKEN KEIKI website at: https://www.rikenkeiki.com/
JAPAN: +81-3-3966-1113
Table: List of warranty years
Product warranty
3 years
Sensor warranty
Sensor
Detection target gas
model
OS-BM2 C
Oxygen (O2)ESR-X13P
Oxygen (O2)

1 year
3 years

Sensormodel
ESR-A13D
ESR-A13D

Warranty

Detection target gas

Warranty
3 years
3 years

ESR-A13i

Hydrogen sulfide (H2S)

3 years

ESR-A13D

ESR-A13P

Carbon monoxide (CO)Carbon monoxide (CO)(reduced hydrogen Interference)
Carbon monoxide (CO) / Oxygen(O2)

3 years

ESR-A13D2

Sulfur dioxide (SO2)
Nitrogen dioxide (NO2)
Hydrogen cyanide(HCN)
Phosphine (PH3)

3 years

ESR-B134

Ammonia (NH3)

1 years

3 years

ESR-B136

Chlorine (CL2)

1 years

ESR-A1CP
ESR-X1DP

168 / 168

3 years
3 years

Revision History

Revision History
Issue
0
1

2

3
4
5
6
7
8

Revision details
First issue*Corresponds to Operation Manual PT0E-1890.
Added 1-4. Checking standards and explosion-proof
specifications/Changed CF-1821 to CF-6280 (CO-04, CX-04)/Other
amendments made to wording*Corresponds to Operation Manual PT0E-1891.
Revised 2-4. Safety information/Added description to 10-2. Specifications
by model/Added “SC-04 (NO2, HCN)”/modified “SC-04 (SO2) alarm
setting range”*Corresponds to Operation Manual PT0E-1892.
Added 7-2-1. Preparation for calibration/Added 11-3. Limited Warranty
and Limitation Liability*Corresponds to Operation Manual PT0E-1893.
Correction「9. Troubleshooting」*Corresponds to Operation Manual PT0E-1894
Added “SC-04 (PH3)”*Corresponds to Operation Manual PT0E-1895
Added “SC-04 (NH3)”*Corresponds to Operation Manual PT0E-1896
Added “SC-04 (CL2)”*Corresponds to Operation Manual PT0E-1897
Correction 1-2. Intended use, 3-1. Main unit and accessories, 5-5.
Measuring gas concentration, 7-6-1. Periodic replacement parts, 7-6-2.
Filter replacement, 10-2. Specifications by model*Corresponds to Operation Manual PT0E-1898

Issue date
2020/1/23
2020/4/9

2020/11/25

2021/3/25
2021/6/4
2021/7/19
2021/9/3
2021/10/14
2023/4/10

9
10
11

Correction 1-4. Checking standards and explosion-proof specifications / 2-4.
Safety information / added UKCA Declaration of conformity*Corresponds to Operation Manual PT0E-1899
Deletion UKEX / UKCA Declaration of conformity / correction 2-4. Safety
information / CE Declaration of conformity*Corresponds to Operation Manual PT0E-18910
Correction CE Declaration of conformity*Corresponds to Operation Manual PT0E-18911

2023/9/11
2024/5/31
2024/7/26