PT0E-18911

Portable Gas Monitor
04 Series

Operation Manual(PT0-189)/

Contents

Contents
1. Product Overview .........................................................................................................................................................4
1-1. Introduction ...........................................................................................................................................................4
1-2. Intended use .........................................................................................................................................................6
1-3. DANGER, WARNING, CAUTION, and NOTE .....................................................................................................7
1-4. Checking standards and explosion-proof specifications.......................................................................................8
2. Important Safety Information ........................................................................................................................................92-1. Danger information ...............................................................................................................................................92-2. Warning information ........................................................................................................................................... 12
2-3. Caution information ............................................................................................................................................ 16
2-4. Safety information .............................................................................................................................................. 21
3. Product Configuration ............................................................................................................................................... 24
3-1. Main unit and accessories ................................................................................................................................. 24
3-2. Part names and functions .................................................................................................................................. 26
3-2-1. Main unit .................................................................................................................................................. 26
3-2-2. LCD display ............................................................................................................................................. 28
3-3. Inserting the batteries......................................................................................................................................... 29
4. Alarm Functions ........................................................................................................................................................ 33
4-1. Gas alarm types and alarm setpoints ................................................................................................................ 33
4-2. Gas alarm activation .......................................................................................................................................... 40
4-3. Fault alarm activation ......................................................................................................................................... 42
4-4. Outside operating temperature range warning .................................................................................................. 43
5. Usage Instrucions...................................................................................................................................................... 44
5-1. Usage note ......................................................................................................................................................... 44
5-2. Preparing startup................................................................................................................................................ 44
5-3. Turning on the power ......................................................................................................................................... 45
5-4. Performing air calibration ................................................................................................................................... 51
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Contents
5-5. Measuring gas concentration ............................................................................................................................. 54
5-6. Checking the gas concentration, alarm setpoints, etc. (display mode) ............................................................. 56
5-6-1. Procedure for displaying display mode ................................................................................................... 56
5-6-2. Items displayed in display mode ............................................................................................................. 57
5-7. Turning off the power ......................................................................................................................................... 62
6. User Mode Settings................................................................................................................................................... 63
6-1. User mode setting procedure ............................................................................................................................ 63
6-2. User mode setting items .................................................................................................................................... 66
7. Maintenance .............................................................................................................................................................. 70
7-1. Maintenance intervals and maintenance items ................................................................................................. 70
8. Storage and Disposal ................................................................................................................................................ 72
8-1. Procedures for storage or when not in use for extended periods ...................................................................... 72
8-2. Product disposal................................................................................................................................................. 73
9. Troubleshooting ......................................................................................................................................................... 74
9-1. Product abnormalities ........................................................................................................................................ 74
10. Product Specifications ............................................................................................................................................... 77
10-1. Common specifications .................................................................................................................................... 77
10-2. Specifications by model ................................................................................................................................... 79
11. Appendix ................................................................................................................................................................... 83
11-1. Limited Warranty and Limitation Liability .......................................................................................................... 83

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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 operation 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 operation manual on hand to allow ready reference during use.
For more information on product maintenance and setting changes, refer to the Technical Manual available fordownload from our website.
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
the warranty 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 operation manual.
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1. Product Overview

1-1. Introduction

Models covered by this operation manual OX-04G ・ OX-04 ・ CO-04 ・ HS-04 ・ CO-04 (C-) ・ CX-04
 SC-04 (SO2, NO2, HCN, PH3, NH3, CL2)<This operation manual>In this operation 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 operation 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. Important Safety Information

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 specifications:Power source: 3 V DC, 1 mA (Toshiba LR03 battery × 2)
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2. Important Safety Information

2-1. Danger information

・ Export specifications: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.

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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.
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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 replacing the batteries or 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.

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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.

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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.

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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

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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 operation 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)

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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.)

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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.

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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

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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 °C to +60 °C
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'.

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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 °C to +60 °C
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'.

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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://wwws.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

Operation 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)’ in the Technical Manual.)
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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)’ in the Technical Manual.
・ 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

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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)’ in
the Technical Manual.) 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’ in the Technical
Manual.) 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)’ in the Technical Manual.)
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

Entire LCD
display lights up.

5-3. Turning on the power
C-

SO2

NO2 HCN

Calibration
notification*1

PH3

NH3

(Startup time: approx. 20 seconds)

CL2 (Display example: CO-04)
Battery level/
Detection target
Date and time
alarm pattern
gas name

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

Integrated/TWA
alarm setpoint*2

Measurement
mode

Second gas alarm
setpoint

Third gas alarm
setpoint

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, 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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STEL alarm
setpoint

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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SO2

POWER/
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)’ in the Technical Manual.)

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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
NO2

[O2] (oxygen) gas
concentration
display

HS

HCN

C-

PH3

SO2
NH3

[CO] (carbon monoxide) gas
concentration display

CX

CL2

Upper row: [CO] (carbon monoxide) gas
concentration display
Middle row: [O2] (oxygen) gas concentration
displayWARNING 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)’ in the Technical Manual.) 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)’ in the Technical
Manual.) The LCD backlight turns on automatically if an alarm is triggered.

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5. Usage Instrucions

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. Usage Instrucions

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)’ in the Technical Manual.)

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.

―

57 / 85

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. Usage Instrucions

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’ in the Technical Manual.)

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 user mode passwords, see ‘6-13. User mode password setting (PASS-W)’ in the Technical
Manual.

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6. User Mode Settings

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’ in the Technical Manual.

Calibration(GAS CAL)

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

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. User Mode Settings

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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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’ in the Technical Manual.) Regular maintenance: Perform maintenance at least once a year (ideally, at least once every six months).
Maintenance
item

Daily
Monthly
Regularmaintenance maintenance maintenance

Maintenance details
Check 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

Daily
Monthly
Regularmaintenance maintenance maintenance

Maintenance details
Check 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.

71 / 85

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’ in the Technical Manual.)

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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.

73 / 85

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’ in the Technical
Manual.)The power cannot be
turned on.

74 / 85

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’ in the Technical
Manual.)Internal clock abnormality

Set the date and time.
(Refer to ‘6-12. Date and time setting (DATE)’ in theTechnical Manual.)
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.

75 / 85

9. Troubleshooting
Symptom

9-1. Product abnormalities
Cause

Corrective action
This 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.

[M-LIMIT] appears.

Calibration notification
display* Japan Ex specification
only[CAL-LMT] appears.

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

[BP-LMT] appears.

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.

Bump test expiration
displayNOTE
 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.

76 / 85

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

77 / 85

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

78 / 85

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

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

CX-04
Carbon monoxide

OxygenCO

O2Electrochemical type^

Display nameO2

O2

Sensor model

OS-BM2 C

ESR-X13P

H2S

CO

CO

ESR-A13i

ESR-A13P

ESR-A1CP

ESR-X1DP

Display range(resolution)

0.0 to 40.0 % (0.1)

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

Detection range(Japanspecification)

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(Exportspecification)

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 %

79 / 85

0 to 300 ppm (1)300 to 2,000 ppm (10)0 to 300 ppm (1)300 to 2,000 ppm (10)0.0 to 40.0 % (0.1)

10. Product Specifications
Alarm permitted
setting range
Response time*1(T90)
Alarm reset
operation
Operatingtemperature
range(no suddenchanges)
Operatinghumidity range(nocondensation)

10-2. Specifications by model

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

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

Within20 seconds(Typical:
8 seconds)

Self-latching

20 to 2,000 ppm

Within 30 seconds(Typical: 18 seconds)

Self-latching

Within30 seconds(Typical:
6 seconds)−20 °C to +50 °C−40 °C to +60 °C (under temporary use environment for approx. 15 minutes)−20 °C to +50 °C (under continuous use environment)

10 to 90 %RH

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

Operatingpressure 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
operating time*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
operating time*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.)

80 / 85

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

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
5.00 ppm
5.00 ppm
2.00 ppm
5.00 ppm
100.00 ppm
2.00 ppm
5.00 ppm
100.00 ppm
2.00 ppm
5.00 ppm
100.00 ppm

0.50 to 100.00 ppm

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

3.00 ppm
6.00 ppm
6.00 ppm
3.00 ppm
5.00 ppm
20.00 ppm
2.00 ppm
4.00 ppm
20.00 ppm
0.50 ppm
1.00 ppm
20.00 ppm

0.50 to 20.00 ppm

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

4.7 ppm 1st
9.4 ppm 2nd
9.4 ppm 3rd
0.9 ppm TWA
4.5 ppm STEL
30.0 ppm OVER
10.0 ppm 1st
20.0 ppm 2nd
30.0 ppm 3rd
0.9 ppm TWA
4.5 ppm STEL
30.0 ppm OVER

0.9 to 30.0 ppm

0.05 to 20.00

25.0ppm 1st
35.0ppm 2nd
35.0ppm 3rd
25.0ppm TWA
35.0ppm STEL
400.0ppm OVER
25.0ppm 1st
50.0ppm 2nd
300.0ppm 3rd
25.0ppm TWA
35.0ppm STEL
400.0ppm OVER

8.0 to 400.0ppm

Within 90 seconds
Within 90 seconds
Within 30 seconds(Typical: 36 seconds) (Typical: 6 seconds) (Typical: 30 seconds)
Self-latching−20 °C to +60 °C−40 °C to +60 °C−30 °C to +50 °C−40 °C to +60 °C(under temporary use (under temporary(under temporary use
use environment for environment forOperating temperature (under temporary use environment for approx. 15 environment for
range
minutes)
approx. 15 minutes)
approx. 15 minutes) approx. 15 minutes)(no sudden changes)−20 °C to +50 °C−20 °C to +50 °C−20 °C to +50 °C−20 °C to +50 °C(under continuous use environment)(under continuous(under continuous(under continuous
use environment)
use environment)
use environment)
Operating humidity
0 to 95 %RH (under temporary use environment for approx. 15 minutes)
range
10 to 90 %RH (under continuous use environment)(no condensation)

Response time*1(T90)
Alarm reset operation

Within 30 seconds(Typical: 9 seconds)

Within 30 seconds(Typical: 6 seconds)

0.30 ppm 1st
0.60 ppm 2nd
0.60 ppm 3rd
0.30 ppm TWA
1.00 ppm STEL
20.00 ppm OVER
0.30 ppm 1st
0.60 ppm 2nd
1.00 ppm 3rd
0.30 ppm TWA
1.00 ppm STEL
20.00 ppm OVER

81 / 85

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

0.15 to 20.00ppm
Within 90 seconds(Typical: 36 seconds)−40 °C to +60 °C(under temporary use
environment for
approx. 15 minutes)−20 °C to +50 °C(under continuous use
environment)

10. Product Specifications
Operating pressure
rangeContinuous operatingtime*2(Alkaline batteries)
Continuous operatingtime*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. Limited Warranty and Limitation Liability

11

Appendix11-1. 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.

83 / 85

11. Appendix

11-1. Limited Warranty and Limitation Liability

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.
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

84 / 85

11. Appendix

11-1. Limited Warranty and Limitation Liability
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

85 / 85

3 years
3 years

Revision History

Revision History
Issue
0
1

2
3
4
5
6
7
8

Revision details
First issue*Corresponds to Technical Manual PT0-1940.
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 Technical Manual PT0E-1941.
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 Technical Manual PT0E-1942.
Added 11-1. Limited Warranty and Limitation Liability*Corresponds to Technical Manual PT0E-1943.
Correction「9. Troubleshooting」*Corresponds to Technical Manual PT0E-1944
Added “SC-04 (PH3)”*Corresponds to Technical Manual PT0E-1945
Added “SC-04 (NH3)”*Corresponds to Technical Manual PT0E-1946
Added “SC-04 (CL2)”*Corresponds to Technical Manual PT0E-1947
Correction 1-2. Intended use, 3-1. Main unit and accessories, 5-5.
Measuring gas concentration, 10-2. Specifications by model*Corresponds to Technical Manual PT0E-1948

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 / 24. Safety information / added UKCA Declaration of conformity*Corresponds to Technical Manual PT0E-1949
Deletion UKEX / UKCA Declaration of conformity / correction 2-4. Safety
information / CE Declaration of conformity*Corresponds to Technical Manual PT0E-19410
Correction CE Declaration of conformity*Corresponds to Technical Manual PT0E-19411

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