PT2E-2975

Smart transmitter/
Gas Detector Head

SD-1
（TYPE GP MED EX）
Operating Manual(PT2E-160)

Operating Precautions
This detector is a gas detector that detects combustible gases in the air and triggers a gas alarm.
The gas detector is a safety unit, not an analyzer or densitometer which performs quantitative/qualitative
analysis/measurement for gases.
Please fully understand the following points before using it, so that it can be used properly.
1.

This detector may be interfered by gases and vapors other than the gas to be detected.
Please note that the alarm may be triggered by interference. In addition, it may be fluctuated byenvironmental (temperature, humidity, etc.) changes in the installation site.

2.

The alarm must be set within a range where the performance of the detector can be ensured.
In facilities compliant with the High Pressure Gas Safety Act, an alarm setting below our standard
alarm setpoint may trigger a false alarm.

3.

This is a safety unit, not a control unit.
The alarm contact output of the detector must be used for an external alarm lamp/buzzer, while thealarm signal output must be used for an indicator or external recorder.
If these outputs are used to control other units, we shall not be responsible for any malfunctions.

4.

The gas sensing part of the gas detection sensor installed in this detector is made of metal porous
sintered alloy permeated with an oxidation catalyst.
If silicon or sulfide compounds are accumulated on the surface of porous sintered alloy, the area of thegas sensing part becomes smaller, which may results in serious deterioration of its sensitivity.
For safety reasons, do not use the detector under the presence of silicon or sulfide compounds eventhough their amount is very small.

5.

For maintenance of the detector, it must go through a regular maintenance, including replacement andadjustment of the regular replacement parts as specified in the operating manual. In addition, because
this is a safety unit, it is recommended that a regular maintenance and a gas calibration are performed
every six months in accordance with the regulations.

Operating Precautions<Contents>
1 Outline of the Product ............................................................................................................ 2
1-1. Preface ............................................................................................................................ 2
1-2. Purpose of use ................................................................................................................ 2
1-3. Definition of DANGER, WARNING, CAUTION, and NOTE ............................................. 2
1-4. Method of confirmation for Standards and Explosion proof specification ........................ 3
2 Important Notices on Safety .................................................................................................. 4
2-1. Danger cases .................................................................................................................. 4
2-2. Warning cases................................................................................................................. 5
2-3. Precautions ..................................................................................................................... 6
2-4. Safety information ........................................................................................................... 7
3 Product Components ............................................................................................................. 8
3-1. Gas detector and standard accessories .......................................................................... 8
3-2. Names and functions for each part.................................................................................. 9
3-3. Block diagram.................................................................................................................. 10
4 How to Use ............................................................................................................................ 11
4-1. Before using the detector ................................................................................................ 11
4-2. Precautions for installation points .................................................................................... 11
4-3. Precautions for system designing.................................................................................... 12
4-4. How to install ................................................................................................................... 14
4-5. Installation procedure ...................................................................................................... 15
4-6. How to wire...................................................................................................................... 16
5 How to Operate ..................................................................................................................... 19
5-1. Preparation for start-up ................................................................................................... 19
5-2. Basic operating procedures ............................................................................................. 19
5-3. How to start the detector ................................................................................................. 20
5-4. Modes ............................................................................................................................. 21
5-5. User mode ....................................................................................................................... 22
5-6. How to exit....................................................................................................................... 24
6 Operations and Functions ..................................................................................................... 25
6-1. Gas alarm activation ........................................................................................................ 25
6-2. Fault alarm activation ...................................................................................................... 26
6-3. External output operation ................................................................................................ 27
6-4. Other functions ................................................................................................................ 28
7 Maintenance .......................................................................................................................... 29
7-1. Maintenance intervals and items ..................................................................................... 29
7-2. Regular maintenance mode ............................................................................................ 31
7-3. Gas calibration method ................................................................................................... 38
7-4. Parts replacement ........................................................................................................... 42
8 Storage, Relocation and Disposal ......................................................................................... 44
8-1. Procedures to store the detector or leave it for a long time ............................................. 44
8-2. Procedures to relocate the detector or use it again ......................................................... 44
8-3. Disposal of products ........................................................................................................ 44
9 Troubleshooting ..................................................................................................................... 45
10 Product Specifications ......................................................................................................... 47
10-1. List of specifications ...................................................................................................... 47
10-2. List of accessories ......................................................................................................... 50
10-3. Detection principle ......................................................................................................... 50
11 Definition of Terms ............................................................................................................... 51-1-

1 Outline of the Product1-1. Preface

1

Outline of the Product1-1. Preface
Thank you for choosing our smart transmitter/gas detector head SD-1(TYPE GP MED EX). Please checkthat the model number of the product you purchased is included in the specifications on this manual.
This manual explains how to use the detector and its specifications. It contains information required forusing the detector properly. Not only the first-time users but also the users who have already used the
product must read and understand the operating manual to enhance the knowledge and experience before
using the detector.

1-2. Purpose of use
 The detector is a fixed type gas detector head that detects leak of combustible gases and that performs thealarm activation when the gas concentration is over the setting value.
This detector is a safety unit, not an analyzer or densitometer which performs quantitative/qualitative
analysis/measurement for gases. Please fully understand the features of the detector before using it, sothat it can be used properly.
 The detector detects abnormalities in the air caused by presence of gases or other reasons (leak) with thebuilt-in gas sensor. The concentrations of detected gases are displayed on the seven-segment LED.
 The detector has a built-in alarm contact and can be used either as a gas alarm, fault alarm, or common(gas, fault) alarm.
 The detector outputs gas concentration in 4 – 20 mA.

1-3. Definition of DANGER, WARNING, CAUTION, andNOTE
DANGERWARNINGCAUTION
NOTE

This message indicates that improper handling may cause serious
damage on life, health or assets.
This message indicates that improper handling may cause serious
damage on health or assets.
This message indicates that improper handling may cause minor
damage on health or assets.
This message indicates advice on handling.

-2-

1 Outline of the Product1-4. Method of confirmation for Standards and Explosion proof specification

1-4. Method of confirmation for Standards andExplosion proof specification
This instrument has some specification depends on standard and explosion proof certificate. Pleaseconfirm the detector specification before using. Please refer Declaration of Conformity that is at the end of
this manual if you have CE marking type. You can confirm instrument specification to see name plate as
follows.
Ex marking

CE marking

ATEX/IECEx, CE marking type name plate-3-

MED mark

MED mark position

2 Important Notices on Safety

2-1. Danger cases

2

Important Notices on
Safety2-1. Danger cases
DANGER<About explosion-proof> The window plate material is a polycarbonate resin. Do not use organic solvents and alkali types(liquid or vapor). It may cause the color and shape of the window plate to be changed.
 Do not open the lid when applying current.
 Do not attempt to repair the detector.
 For the lid, use hexagon socket head bolts specified by RIKEN KEIKI.
 Do not apply a strong force or shock to the window plate. The explosion-proof performances may be
deteriorated due to damages. The explosion protection conditions for the detector is "low (2J)"
possibility of mechanical damage.
 Ambient temperature:-20 to +60°C
 Do not replace parts at your sole discretion but contact RIKEN KEIKI if the transparent window has acrack or the explosion-proof joint surface is abnormal, or the clamping screw or bolt is changed, lostetc.
 Do not repair the explosion-proof joint surface.
 Be careful not to hit sharp tools against the window plate.

-4-2 Important Notices on Safety

2-2. Warning cases

2-2. Warning cases
WARNING
Power supply
Before turning on the detector, always check that the voltage is properly applied. Do not use an unstable
power supply because it may cause malfunctions.
Need of grounding circuit
Do not cut the grounding circuit or disconnect the wire from the grounding terminal.
Defects in protective functions
Before starting the detector, check the protective functions for defects. When seeming defects are foundin the protective functions, such as protective grounding, do not start the detector.
External connection
Before connecting the detector to the external control circuit, securely connect it to a protective
grounding circuit.
Zero adjustment in the atmosphere
When the zero adjustment is performed in the atmosphere, check the atmosphere for freshness before
beginning the adjustment. If other gases exist, the adjustment cannot be performed properly, thus
leading to dangers when the gas leaks.
Response to a gas alarm
Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based on yourjudgment.

-5-

2 Important Notices on Safety

2-3. Precautions

2-3. Precautions
CAUTION
Do not use a transceiver near the detector.
Radio wave from a transceiver near the detector or its cables may disturb commands. If a transceiver isused, it must be used in a place where it disturbs nothing.
To restart the detector, wait for five seconds or more before doing it.
Restarting the detector within five seconds may cause errors.
Do not use the external output of the detector to control other units.
This is not a control unit. It is not allowed to use the external output of the detector to control other units.
Do not disassemble/modify the detector, or change the settings if not necessary.
Disassembling/Modifying the detector will invalidate the warranty of the performance. Changing thesettings without understanding the specifications may cause alarm malfunctions. Please use the detector
properly in accordance with the operating manual.
Avoid applying organic solvents and others to the window plate for a long time.
The window plate material is a polycarbonate resin. When organic solvents (liquid or highly-concentrated
vapor) and others are applied to the plate for a long time, its color and shape may be changed.
Do not forget to perform a regular maintenance.
Since this is a safety unit, a regular maintenance must be performed to ensure safety. Continuing to use
the detector without performing a maintenance will compromise the sensitivity of the sensor, thus
resulting in inaccurate gas detection.

-6-

2 Important Notices on Safety

2-4. Safety information

2-4. Safety information
Necessary information for explosion proof construction of Model SD-1(TYPE GP MED EX).
The Model SD-1 is a fixed mount, continuous-monitoring detector head and provides a 4-20mA signal whichindicates the target gas reading for use by a gas monitoring controller, recording device, or programmablecontroller.
Three sets of relay contacts, two controlled by the gas alarms and one by the fail alarm.

Technical Data
(Protection Method)(Certificate Numbers)(Group)(Category)(Type of Protection and Marking code)(Equipment Protection Level)(Ambient Temperature)(Electrical Data)(Applicable Standard)(Manual Number)

Flameproof enclosure “d”
IECEx KEM 10.0036X
KEMA 10ATEX0083 X
II
2G
Ex db IIC T5
Gb-20C to +60C
Supply voltage: 24 V dc (Typ.)
Output signal: 4 to 20 mA
IEC 60079-0: 2017，IEC 60079-1: 2014-06
EN IEC 60079-0: 2018，EN 60079-1: 2014
PT2E-160

Installation

Installation Diagram
Hazardous Location(Zone 1)←→

Nonhazardous Location
Indicator

Gas Detector(SD ‐ 1)＋－
SignalCVVS Cable

-7-

＋
－
Signal3 Product Components

3-1. Gas detector and standard accessories

3

Product Components
3-1. Gas detector and standard accessories<Main Unit> (including a cable gland)<Standard Accessories> Operating manual Dedicated handling lever (used for the wiring) Dedicated control key

CAUTION
Use the supplied dedicated control key to operate the detector. If products other than theseaccessories are used, key operations cannot be accepted properly.
Note that the control key is made of extremely strong magnet. Putting it close to a magnetic product,such as a credit card and ID card, may damage the stored data.

-8-3 Product Components

3-2. Names and functions for each part3-2. Names and functions for each part
(5) Power lamp

(6) Alarm lamp

(7) Fault lamp(3)  key(1) MENU/ESC key(8) Concentration
value display(4)  key(2) SET key(1)

MENU/ESC key(2)

SET key

(3)
(4)

 key
 key

(5)

Power lamp

(6)

Alarm lamp

(7)

Fault lamp

(8)

Concentration value
display

Used to enter the maintenance mode.
It is also used to cancel in a specific mode.
It is used for value confirmation and so on in a specificmode.
Used to switch menus or change a value (UP).
Used to switch menus or change a value (DOWN).
Power lamp.
Detection mode: It lights up in green.
Maintenance mode: It blinks in green.
Alarm lamp. It lights up in red when the alarm setpoint value
is reached.
Fault lamp. It lights up in yellow when an abnormality isdetected in the detector.
Displays the gas concentration and so on.

-9-3 Product Components

3-3. Block diagram

3-3. Block diagram<Electric Diagram>

Power supply part
POWER INPUT (24 VDC)
Display(POWER) (ALARM) (FAULT)

Alarm contact controller

Controller(CPU)

Gas alarm contact (ALARM)
Contact activation• De-energized(De-energized at a
normal environment)• ON-ALARM(Closed contact at an
alarm time)Seven-segment LED(four-digit)
Magnetic operation part
(MENU/ESC) (▲) (▼) (SET)

SensorTransmitter• 4 – 20 mA transmission- 10 -

4 How to Use

4-1. Before using the detector

4

How to Use
4-1. Before using the detector
Not only the first-time users but also the users who have already used the product must follow the operating
precautions.
Ignoring the precautions may damage the detector, resulting in inaccurate gas detection.

NOTE
・Regarding the use, setting, and maintenance of gas detectors, it is recommended to refer to standards thatare appropriate for each country's regulations. Example) IEC 60079-29-2, EN 60079-29-2, NFPA 70.

4-2. Precautions for installation points
CAUTION
This is a precision device. Because the detector may not provide the specified performance in someplaces (environments), check the environment in the installation point, and then take appropriate actions
if necessary.
Because the detector plays an important role for safety and disaster prevention, as many units of thedetector as needed must be installed in appropriate points.
Because points where gases leak and remain easily are different depending on the types of gases andthe working areas, please decide carefully installation points and the number of units to be installed.
Do not install the detector in a place with vibrations or shocks.
The detector consists of sensitive electronic parts. The detector must be installed in a stable place without
vibrations or shocks and it cannot drop.
Do not install the detector in a place exposed to water, oil or chemicals.
When selecting installation points, avoid a place where the detector is exposed to water, oil or chemicals.
Do not install the detector in a place where the range of operating temperatures is exceeded.
The detector must be installed in a stable place where the operating temperature is maintained and do notchange suddenly.
Do not install the detector in a place exposed to direct sunlight or sudden changes in the temperature.
When selecting installation points, avoid a place where it is exposed to direct sunlight or radiant heat
(infrared rays emitted from a high-temperature object), and where the temperature changes suddenly.
Condensation may be formed inside the detector, or the detector cannot adjust to sudden changes in thetemperature.

- 11 -

4 How to Use

4-3. Precautions for system designing

Keep the detector (and its cables) away from noise source devices.
When selecting installation points, avoid a place where high-frequency/high-voltage exist.
Do not install the detector in a place where maintenance of the detector cannot be performed or wherehandling the detector involves dangers.
Regular maintenance of the detector must be performed.
Do not install the detector in a place where the machinery must be stopped when maintenance is performed
in its inside, where parts of the machinery must be removed to perform maintenance, or where the detector
cannot be removed because tubes or racks prevent access to it. Do not install the detector in a place where
maintenance involves dangers, for example, near a high-voltage cable.
Do not install the detector in machinery which is not properly grounded.
Before installing the detector in machinery, the machinery must be grounded properly.
Do not install the detector in a place where other gases exist around it.
The detector must not be installed in a place where other gases exist around it.

4-3. Precautions for system designing
CAUTION
An unstable power supply and noise may cause malfunctions or false alarms.
The descriptions in this section must be reflected on the designing of a system using the detector.
Using a stable power supply
The external output and alarm contact of the detector may be activated when the power is turned on, whenmomentary blackout occurs, or when the system is being stabilized. In such cases, use a UPS, or takeappropriate actions on the receiving side of output signals.
The detector must be provided with the following power supply.
Power supply
voltageAllowed time of
momentary blackout

Others24 VDC±10%: Terminal voltage of the detector
Up to 10 milliseconds(To recover from the momentary
blackout for 10 milliseconds or more,restart the detector.)
Do not use it with a power supply oflarge power load or high-frequency
noise.

Example of actions
To ensure continuous operation andactivation, install a UPS outside thedetector.
Example of actions
Use a line filter to avoid the noise
source if necessary.

Introducing protective measures against lightning
If cables are installed outside the factory/plant, or if internal cables are installed in the same duct as thecables coming from outside the factory/plant, "lightning" will cause problems. Because lightning acts as alarge emission source while cables act as a receiving antenna, devices connected to the cables may bedamaged.
Lightning cannot be prevented. Cables installed in a metal conduit or under the ground cannot becompletely protected from inductive lightning surge caused by lightning. Although complete elimination ofdisasters caused by lightning is impossible, the following protective measures can be taken.

Protection against
lightning

Take appropriate measures in accordance with the importance of the facilities
and the environment.
 Provide protection by a lightning arrester (cable safety retainer).
(Although inductive lightning surge can be transmitted through the cable, it isprevented by installing a lightning arrester before the field devices and central
processing equipment. For information on how to use a lightning arrester,- 12 -

4 How to Use

4-3. Precautions for system designingplease contact the manufacturer.)

In addition to lightning, there are more sources of surge noise. To protect units
from these noise sources, the units must be grounded.
* The lightning arrester has a circuit to remove a surge voltage which damages field devices, so that signals
may be attenuated. Before installing a lightning arrester, verify that it works properly.
Grounding

Proper use of alarm contact
The alarm contact of the detector is used to transmit signals to activate an external buzzer, an alarm lamp ora rotating lamp. Do not use the detector for controlling purpose (e.g., controlling the shutdown valve.)
The specifications for the alarm contact of the detector are based on the resistant load conditions. If
inductive load is used at the alarm contact, the following errors will occur easily because counterelectromotive force is generated at the contact.
 Deposition, defective insulation or defective contact at the relay contact
 Damage of any electric parts due to high-voltage generated inside the detector
 Abnormal operations by an out-of-control CPU

CAUTION
In principal, do not activate inductive load at the alarm contact of the detector. (In particular, never use theinductive load to activate a fluorescent lamp or motor.)
If inductive load is activated, relay it with an external relay (contact amplification). However, because thecoil of an external relay also involves inductive load, select a relay at a lower voltage (100 VAC or below),
and then protect the contact of the detector with an appropriate surge absorbing part, such as a CR circuit.

If load is to be activated, appropriate measures must be taken to stabilize the operation of the detector andprotect the alarm contact referring to the following information.
 Relay it with an external relay at a lower voltage of 100 VAC or below (contact amplification). At thesame time, the surge absorbing part SK1 suitable for the specifications must be attached to the external
relay.
 In addition, the surge absorbing part SK2 must be attached to the loaded side of the external relay ifnecessary.
 It may be recommended that the surge absorbing part should be attached to the contact for certain loadconditions. It must be attached to an appropriate position by checking how the load is activated.

- 13 -

4 How to Use

4-4. How to install

4-4. How to install<Installation Dimensions and Maintenance Space>

193mm

150mm

The following installation requirements must be met to install the detector.
 Attach the detector on the wall and others using four M5 screws.
 Tighten the hexagon socket head cap screws fixing the lid and the main body with the tightening torque of
215.6±24.5N･cm.
 When closing the lid of the detector, please wipe the screw and the mating surface of the main body andthe lid, and apply our company-specified grease.
 To maintain compliance to EN 60079-29-1, ensure orientation is within ±90° of normal on installation.
(Sensor part installed downward)

CAUTION
Do not install the detector in a place where maintenance of the detector cannot be performed or wherehandling the detector involves dangers.
Regular maintenance of the detector must be performed.
Do not install the detector in a place where the machinery must be stopped when maintenance isperformed in its inside, where parts of the machinery must be removed to perform maintenance, orwhere the detector cannot be removed because tubes or racks prevent access to it. Do not install thedetector in a place where maintenance involves dangers, for example, near a high-voltage cable.

NOTE
・Hexagon socket head cap screws with strength class "A2-70" are used.
When you lost or replace it, we recommend that you ask our local sales office nearest you.
・Our company-specified grease : BARRIERTA JFE 552（NOK KLUBER made）
If you can not prepare the specified grease, please use one that meets the following requirements.
1. Those not cured by deterioration
2. Those containing no volatile solvent
3. Those which do not cause corrosion on joint surfaces
4. Those not including silicon type- 14 -

4 How to Use

4-5. Installation procedure

4-5. Installation procedure
The detector comes with adapter A (NPT 1/2) as standard.
Please prepare the Ex cable gland that is suitable for the adapter.
Adapter(NPT1/2)

WARNING Do not replace parts at your sole discretion but contact RIKEN KEIKI if the transparent window has acrack or the explosion-proof joint surface is abnormal, or the clamping screw or bolt is changed, lost etc.

NOTE
・Our company-specified grease : BARRIERTA JFE 552 (manufactured by NOK KLUBER)
If you can not prepare the specified grease, use one that meets the following requirements.
1. Material does not harden due to deterioration
2. Volatile solvent-free
3. Material does not cause corrosion at the surface
4. Silicon-free
5. Validation of suitability depends on the specifications of grease manufacturer- 15 -

4 How to Use

4-6. How to wire

4-6. How to wire
CAUTION Be careful not to damage the internal electronic circuit when wiring. In addition, be careful not to apply
stresses on the detector when (overweight) cables are installed.
 The power cables and signal cables must not be installed together with the motor power cables, etc.
When these cables must be installed together for unavoidable reasons, put the power cables andsignal cables in a metal conduit. The conduit must be connected to a grounding circuit.
 When stranded wires are used, prevent wires from contacting each other.
 Use the dedicated handling lever to wire.
 Use appropriate cables to wire.

<Recommended Cable>
3-wire (when the contact is not used)
5-wire (when the contact is used)

CVVS1.25 sq - 3-core
CVVS1.25 sq - 5-core<Figure of Terminal Plate>

24 VDC
4 - 20mA

DC+

1- (Common)

2

Sig+

3

Contact

4

Contact

5

Groundingterminal<Specifications of Terminal Plate>Specifications of terminal plate Rated voltage: 250 VAC
 Rated current: 12 A
However, it depends on cables to be used.
Connection conditions
 Cables: 0.25 - 2.5 mm2
 Bare wire length: 8 - 9 mm
 Connecting tool: Dedicated handling lever (accessory) or driver (edge 3.5 x 0.5 mm)- 16 -

4 How to Use

4-6. How to wire

CAUTION
The specified bare wire length must be observed when the wire insulation is peeled off.
Improper clamping of the wire due to a shorter bare wire length may cause defective electrification or
heating.
Damaging the wire insulation due to a shorter bare wire length may cause defective electrification or
heating.
Exposing the wire due to a longer bare wire length may cause defective insulation or a short circuit.
Be careful not to break up the wire. If the wire is broken up when inserted to the terminal, this may cause
defective insulation or heating.

Compatible bar terminal
For a bar terminal, the following items are available.
 Bar terminal (ferrule): Model 216 Series (manufactured by WAGO)
 Crimping tool: Model VarioCrimp 4 (206-204) (manufactured by WAGO)

CAUTION
A bar terminal of the specified model must be used. Using other bar terminals invalidates the warranty ofthe performance.

<How to Connect to Terminal Plate>
When cables are connected to the connectors, use the dedicated lever or a flathead screwdriver to do it asshown below.

CAUTION
The right tools must be used.
In principal, one wire can be connected to one wiring hole.
When the wire is inserted into the driver slot by mistake, it does not contact the conductive part. This may
cause defective electrification or heating.
When the wire is inserted under the spring by mistake, it does not contact the conductive part. This may
cause defective electrification or heating.

NOTE<How to Use the Dedicated Handling Lever>Push the lever with your finger
to lower the spring in its inside.

While holding down the lever, insert the wire into the(round) wiring hole until it reaches the deepest point.
Once the lever is released, the wire is secured.

To check whether the wire is connected securely, pull the wire gently. (Do not pull the wire strongly.)- 17 -

4 How to Use

4-6. How to wire

<Grounding>Connect the detector to your grounding terminal with the external terminal.

WARNING Before turning on the detector, do not forget to connect it to a grounding terminal.
 For stable operation of the detector and safety, it must be connected to a grounding terminal. Do notconnect the grounding wire to a gas pipe.
 The grounding must be made as D type grounding (below 100 Ω of grounding resistance).
 For the grounding wire, use cable lugs to safely connect it to a grounding terminal without loosenessor twist.
 Use ring terminals to connect the grounding terminal with the ground and use the grounding wire withcross-sectional area of 4 mm2 or more for the external grounding terminal.

<Wiring Example>
Connecting to the indicatorSD-1
1 2 3 4 5
RM-5003, etc.
+24 V
GND
Sig

Connecting to the upper unit (DCS, PLC)
SD-1
1 2 3 4 5Power supply(24 VDC)

Relay terminal
plate

+
-

Upper unit
(DCS, PLC)+

- 18 -

5 How to Operate

5-1. Preparation for start-up

5

How to Operate
5-1. Preparation for start-up
Before supplying power, read and understand the following precautions. Ignoring these precautions may
cause an electric shock or damage the detector.
 Connect the detector to a grounding circuit.
 Check that the wiring is connected to external device properly.
 Check that the power supply voltage is compliant with the specifications.
 Because the external contact may be activated during the adjustment, take measures to prevent anactivated contact from having influences on external device.

5-2. Basic operating procedures
Normally, the detection mode is activated after the power is turned on.

LED

MENU/ESC(long pressing)

MENU/ESC(long pressing)

LED

LED

LED

LED

- 19 -

5 How to Operate

5-3. How to start the detector

WARNING
When the detector enters other mode from the detection mode while an alarm is activated, the alarm isreset.

5-3. How to start the detector
 Before supplying power (24 VDC) to the detector, check that the detector is installed properly.
 Supply power (24 VDC) to the detector (turn on the detector).
 After the detector completes the start-up, it enters the detection mode swiftly.

CAUTION Do not turn off the detector during the initial clear. The detector is reading the internal memory during
the initial clear.
 If the detector is installed newly or the new sensor is replaced, the sensor must be warmed up for a
specified period which is determined depending on the type of the sensor after the detector is started.
 After the warm-up is completed, perform a gas calibration.

NOTE<<Start-up Operation Procedures>> (approximately 25 seconds for system check of the detector and alarmdeactivation)
Power on → Initial clear (approximately 25 seconds) → Detection modeLED

- 20 -

5 How to Operate

5-4. Modes

5-4. Modes
Details on each mode are provided as follows.

CAUTION Do not change the settings if not necessary. Changing the settings without understanding thespecifications may cause malfunctions.

Mode
Detection
Mode
MaintenanceMode(User)

Item-

LED display
Gas
concentration

Details
Normal state

ROM/SUM Display

1-0

Zero Adjustment
Setting Display
Switch to maintenance
mode

1-1
1-2

Display the program version and others.
This is not typically used by the user.
Perform the zero adjustment.
Display various setting values.

1-3

Switch to the regular maintenance mode.

Perform various tests.
2-0.0 Gas Test
2-0.1 Alarm Test
Test Mode
2-0
2-0.2 Fault Test
2-0.3 LED Test
2-0.4 Memory Test
Zero Adjustment
2-1
Perform the zero adjustment.
Span Adjustment
2-2
Perform the span adjustment.
Zero/Span Initialization 2-3
Initialize zero/span values.
Used for various environmental settings.
2-4.0 Sensor power supply ON/OFF
2-4.1 INHIBIT Setting
2-4.2 Alarm Setpoint Setting
2-4.3 Alarm Delay Time Setting
2-4.4 Alarm Pattern Setting
Maintenance2-4.5 Zero Suppression Pattern SettingMode
2-4.6 Zero Suppression Value Setting(Regularmaintenance)
2-4.7 Alarm Contact Specification Setting
Environmental Setting
2-4
2-4.8 Energized/De-energized Contact
Setting
2-4.9 Zero Follower Selection
2-4.A Maintenance Mode External Output
Setting
2-4.B External Output Setting
2-4.C Alarm Test External Output Setting
2-4.D Sensor Operation Start Setting
2-4.E Password Setting
2-4.F Sensor Fault Alarm Pattern Setting
Display various electrical settings.
Display
2-5This is not typically used by the user.
Switch to factory mode 2-6
Not used
Switch to user mode
2-7
Returns to the user mode.
* Maintenance mode has setting item with important tool. As operation that mistook for this reason may
be occurred, this detector to malfunction, our service engineer for maintenance manipulate.
This is not typically used by the user.

- 21 -

5 How to Operate

5-5. User mode

5-5. User mode
WARNING
After the adjustment is completed, never fail to press MENU/ESC key to return to the detection mode.
(If the detector remains in the user mode, it automatically returns to the detection mode in ten hours.)

LED

Show Various Settings24- 22 -

5 How to Operate

5-5. User mode

<Zero Adjustment "1-1">This is used to perform the zero adjustment.
LED

NOTE

 If the zero calibration failed since the zero point was significantly fluctuated from around zero, it returns to
1-1 after FAIL rather than PASS is displayed. In this case, the zero adjustment has not been completed.

- 23 -

5 How to Operate

5-6. How to exit

<Setting Display "1-2">
Display various setting values.
LED

Press SET key.

AL.:

The contact is activated
due to the gas alarm.
FAU.: The contact is activated
due to the fault alarm.
A.orF.: The contact is activated
due to the gas alarm or
the fault alarm.

5-6. How to exit
To turn off the detector, turn off the power supply (24 VDC) to the detector.

WARNING When the detector is turned off, an alarm may be activated on the upper (central) system.
 Before turning off the detector, INHIBIT (point skip) on the upper (central) system must be activated.
Decide whether power can be turned off by checking the operation of the devices connected to theexternal output or external contact output terminal of the detector.
 If the alarm contact is energized (option), it is activated when the detector is turned "OFF".

- 24 -

6 Operations and Functions

6-1. Gas alarm activation

6

Operations and Functions
6-1. Gas alarm activation
Gas alarm: Activated when the concentration of detected gas reaches or exceeds the alarm setpoint value.
<<Auto-Reset>>

NOTE
The alarm setpoint is factory-set. Although the alarm delay time (standard: 2 seconds) works in the detector toprevent a false activation, it can be cancelled if not needed.

<Display Operation>
Gas Concentration Display
In case of over the detection range (Over Scale), "∩∩∩∩" is displayed on the LED.
Power Indicator Lamp (POWER: Green)
During operation, this lights up continuously.
Alarm Indicator Lamp (ALM: Red)
It lights up when the alarm setpoint value is reached to or exceeded.

<Contact Activation>
The contact is activated when the gas concentration reaches or exceeds the alarm setpoint value. (onlywhen the alarm is used)
The contact activation is reset automatically when the gas concentration drops below the alarm setpointvalue.

Concentration

Alarm setpoint

0
Time
Alarm lamp (ALM)
Alarm contact (terminal plate 4, 5)

Alarm delay time (2 seconds)- 25 -

6 Operations and Functions

6-2. Fault alarm activation<Response to Gas Alarm>
A gas concentration value exceeds the alarm setpoint
When a gas alarm is triggered, take actions in accordance with your management rules of gas alarm.
Normally, take the following actions.
 Check the reading of the detector.

NOTE
If a gas leak is momentary, the reading may already have dropped when checking it. In addition, when thealarm is triggered by noise or other incidental conditions other than a gas, the reading may have already
dropped.
 Based on your management rules of gas alarm, no one can be allowed to access the monitored zone toensure safety.
 If the gas concentration display continues to be displayed, close the main valve of the gas, and then checkthat the gas concentration reading dropped.
 Equipped with a protective gear to avoid dangers caused by possibly remaining gases, before accessing
the gas leak point, and then check that gases remain by using a portable gas detector.
 Determine that the point is free from dangers, and take actions to fix the gas leak.

NOTE
When high concentration gas exceeding full scale is detected, the sensor may be contaminated.
In such a case, in order to ensure the reliability of the detector, carry out zero calibration and spancalibration properly.

6-2. Fault alarm activation
A fault alarm is triggered when the detector detects abnormalities. After a fault alarm is triggered, the fault
lamp (yellow) lights up and an error message is displayed on the LCD. Determine the causes and takeappropriate actions.
After the detector is successfully returned from the fault, it restarts with the process normally performed rightafter it is turned on (initial clear).
If the detector has problems and is repeatedly malfunctioning, contact our overseas sales department or
local representatives immediately.

<Display Operation>
Fault Detail Display
Display a message indicating the fault detail.
Fault Lamp (FAULT: Yellow)
This lights up when a failure occurs.

NOTE
For information on malfunctions (error messages), see "9. Troubleshooting".

- 26 -

6 Operations and Functions

6-3. External output operation

6-3. External output operation
Signal Transmission System
Transmission Path
Transmission DistanceConnection Load ResistanceModePower Off1
2
Initial Clear
3
Detection Mode (No Alarm)4
Detection Mode (Gas Alarm)5
Detection Mode
(Full scale over)6
Fault Alarm
7
INHIBIT
8
Alarm Test
9

Maintenance Mode

Electric current transmission (non-isolated) 4 – 20 mA
CVVS
CVVS 1.25 mm2: Maximum 1.25 km
CVVS 2.0 mm2: Maximum 2.0 km
Below 300 Ω
4 - 20 mA(output value)
0 mA
2.5 mA (Fixed)
4 - 20 mA (concentration output)
4 - 20 mA (concentration output)
Less than 20.5mA:linear output (concentration output)
Exceed 20.5mA :20.5mA (Fixed)
0.5 mA (Fixed)
2.5 mA (Fixed)
Output ON setting: 4 - 20 mA (concentration output)
Output OFF setting: 4 mA
2.5 mA (Fixed)

Example of Gas Concentration and External Output
4 - 20 mA specification(Maintenance output: 2.5 mA [Fixed])
External output
20.5 mA

Detection Mode
Maintenance Mode

4 mA
2.5 mA
Zero suppression0

Gas concentration
Full scale

When the suppression function is canceled, the signal will be linearly output to 4 mA (equivalent to 0% LEL).

CAUTION The 4 - 20 mA output is already adjusted. In case of over scale, an output will not exceed 20.5 mA.
 Output during INHIBIT or initial clear is based on 4 - 20 mA output setting in the maintenance mode.
(2.5mA [Fixed])
In particular, when the detector is started or the specification is changed, be careful about 4-20 mA
output setting. Understand how the detector functions, and take actions, if necessary, so that thesignal receiver side can prepare to avoid false alarms.

- 27 -

6 Operations and Functions

6-4. Other functions

6-4. Other functions<Suppression Function>
The sensors used with the detector are influenced by environmental changes (temperature, humidity, andother characteristics) or interference gases (interference characteristics) in no small measure, which affects
the reading. Therefore, the reading might be fluctuated around zero even in a normal environment.
This function obscures influences by environmental changes and interference gases around zero that haveno meaning for your management rules of gas alarm. This function is used to hide (suppress) the fluctuationof the reading under the setting value, indicating zero.
<<Example>>
Suppression Disabled
A fluctuation around zero is displayed as the reading.

Suppression Enabled
A fluctuation under the setting value is hidden with zero.
(Zero suppression)

NOTE The suppression function is factory-set. The standard setting value is 2% FS.
 In the Zero adjustment mode, this function is disabled and the fluctuation of the reading below the setting
value is displayed.
 The setting value shall be changed by our service personnel or the personnel who is trained. Do not
attempt to change by yourself.

CAUTIONA reading under zero is suppressed with the 10% FS suppression.
A reading that is 10% FS or more under zero is displayed as "-0.0", which prevents an accurate gas
detection and needs the zero adjustment.

- 28 -

7 Maintenance7-1. Maintenance intervals and items

7

MaintenanceThis is an important instrument for the purpose of safety.
To maintain the performance of the detector and improve the reliability of safety, perform a regular
maintenance.

7-1. Maintenance intervals and items
 Daily maintenance: Perform maintenance before beginning to work.
 Monthly maintenance: Perform maintenance on the alarm circuit (alarm test) once a month.
 Regular maintenance: Perform maintenance once or more for every six months to maintain theperformance as a safety unit.
Maintenance
itemPower Supply
Check
Concentration
Display Check

Alarm Test
Span
Adjustment
Gas Alarm
Check
Ground wire
check

Maintenance content
Check that the power lamp lights up.
Check that the concentration display
value is zero. When the reading isincorrect, perform the zeroadjustment after ensuring that noother gases exist around it.
Inspect the alarm circuit by using thealarm test function.
Perform the sensitivity calibration byusing the calibration gas.
Check the gas alarm by using thecalibration gas.
Check the connection of thegrounding wire (no looseness or
corrosion) to maintain EMC
performance.

Daily
maintenance

Monthly
maintenanceRegularmaintenance































－

－

○

<About Maintenance Services> We provide services on regular maintenance including span adjustment, adjustment and maintenance.
To make the calibration gas, dedicated tools, such as a gas cylinder of the specified concentration and gas
sampling bag must be used.
Our qualified service engineers have expertise and knowledge on the dedicated tools used for services,along with other products. To maintain the safety operation of the detector, please use our maintenanceservice.
 The followings are typical maintenance services. For more information, please contact our overseas sales
department or local representative.

- 29 -

7 Maintenance7-1. Maintenance intervals and items

Main Services
Power Supply
Check

:

Concentration
Display Check:

Flow Rate
Check:

Filter Check:

Alarm Test:

Span
Adjustment
Gas Alarm
Check:Cleaning andRepair of the
Detector(visualdiagnosis)
Detector
Operation
Check
Replacement ofConsumable
Parts

:

:

Checks the power supply voltage.
Verifies that the power lamp lights up.
(Verifies that relevant points can be identified on the system.)(When a UPS (uninterruptible power system) is used, checks the operation with the UPS(uninterruptible power system).)
Verifies that the concentration display value is zero (or 20.9 vol% on the oxygen deficiency
meter) by using the zero gas.
Performs the zero adjustment (AIR adjustment) if the reading is incorrect.
Checks the flow rate indicator to find abnormalities.
Checks the flow rate by using an external flow meter to verify the correctness of the flow rate
indicator on the detector. If the flow rate is incorrect, performs the flow rate adjustment.
Checks the dust filter for dust or clogging.
Replaces a dirty or clogged dust filter.
Inspects the alarm circuit by using the alarm test function.
• Checks the alarm lamps. (Check each activation of ALM1 and ALM2.)• Checks the external alarm. (Checks the activation of the external alarm, such as a buzzer.)
Performs the sensitivity calibration by using the calibration gas.
Checks the gas alarm by using the calibration gas.
• Checks the alarm. (Checks the alarm activation when the alarm setpoint is reached.)• Checks the delay time. (Checks time to delay until the alarm is triggered.)• Checks the alarm lamps. (Check each activation of ALM1 and ALM2.)• Checks the external alarm. (Check the activation of external alarms, such as a buzzer andreset signal.)
Checks dust or damage on surface, cover, or internal parts of the detector, clean and repair
such parts of the detector.
Replaces parts which are cracked or damaged.

:

Uses the keys to check the operation of functions and parameters.

:

Replaces consumable parts, such as a sensor, filter and pump.

- 30 -

7 Maintenance7-2. Regular maintenance mode

7-2. Regular maintenance mode
WARNING
After the adjustment is completed, never fail to press MENU/ESC key to return to the detection mode.
(If the detector remains in the maintenance mode, it automatically returns to the detection mode in ten
hours.)Mode

Item

Maintenance Mode
(Regularmaintenance)LED
display

Details

Test Mode

2-0

Zero Adjustment
Span Adjustment
Zero/Span
Initialization

2-1
2-2

Perform various tests.
2-0.0 Gas Test
2-0.1 Alarm Test
2-0.2 Fault Test
2-0.3 LED Test
2-0.4 Memory Test
Perform the zero adjustment.
Perform the span adjustment.

2-3

Initialize zero/span values.

Environmental
Setting

2-4

Display

2-5

Switch to factorymode
Switch to user
mode

Used for various environmental settings.
2-4.0 Sensor power supply ON/OFF
2-4.1 INHIBIT Setting
2-4.2 Alarm Setpoint Setting
2-4.3 Alarm Delay Time Setting
2-4.4 Alarm Pattern Setting
2-4.5 Zero Suppression Pattern Setting
2-4.6 Zero Suppression Value Setting
2-4.7 Alarm Contact Specification Setting
2-4.8 Energized/De-energized Contact Setting
2-4.9 Zero Follower Selection
2-4.A Maintenance Mode External Output
Setting
2-4.B External Output Setting
2-4.C Alarm Test External Output Setting
2-4.D Sensor Operation Start Setting
2-4.E Password Setting
2-4.F Sensor Fault Alarm Pattern Setting
Display various electrical settings.
This is not typically used by the user.

2-6

Not used

2-7

Returns to the user mode.

< Environment setting items and adjustment range >The unit is set at the factory to operate properly. Changing settings is not recommended. If any change isnecessary, carefully consider that there are no operational problems.
LED
display
2-4.1
2-4.2
2-4.6

Item
INHIBIT
Alarm Setpoint
Zero Suppression Value

Factory setting
value
OFF
25.0% FS
2.0% FS- 31 -

Adjustable range
OFF / ON
10 to 60% FS
0 to 2/3 of alarm point

7 Maintenance7-2. Regular maintenance mode
LED

User ModeIn "1-3.", press SET key.

Then press SET key again
for three seconds.
Regular Maintenance Mode
2-0. Test Mode
Perform various tests.

Test Mode=> P332-1. Zero Adjustment
Perform the zeroadjustment.

Zero Adjustment=> P382-2. Span Adjustment
Perform the span
adjustment.

Span
Adjustment=> P402-3. Zero/Span Initialization
Initialize the zero/span
adjustment after the sensor
is replaced.
2-4. Environmental Setting
Set various operations andfunctions.

Environmental
Setting=> P372-4.0 and 2-4.3 to 2-4.F arefactory-set. They are nottypically used by the user.

2-5. Various Electrical
Settings Display
Display various electricalsettings. This is not used by
the user.
2-6.
Enters the factory mode.
This is not used by the user.

2-7.
Returns to the user mode.

rET. is displayed.
Press SET key
again to return tothe user mode.

To 2-0. Test Mode
- 32 -

7 Maintenance7-2. Regular maintenance mode

<Alarm Test Mode "2-0">
LED

2-0
Press SET key.

2-0.0 Gas Test

Gas Test=> P342-0.1 Alarm Test

Alarm Test=> P342-0.2 Fault Test

Fault Test=> P352-0.3 LED Test

LED Test=> P352-0.4 Memory Test

Memory Test=> P36

To 2-0.0

WARNING Before starting the alarm test (transmission test), provide a notification to the related sections so thatthey can prepare for false abnormalities (external output signals and alarm contact). After the test iscompleted, never fail to press MENU/ESC key to return to the detection mode. (If the detector
remains in the alarm test mode, it automatically returns to the detection mode in ten hours.)
 In the alarm test mode, the gas concentration equal to the reading is output even in the maintenancemode depending on the setting. Take actions, if necessary, so that the signal receiver side canprepare to avoid false alarms.

- 33 -

7 Maintenance7-2. Regular maintenance mode

<Gas Test "2-0.0">
LED

2-0.0
Press SET key.

Introduce the test gas andperform the gas test.

Stop introducing the test gas. Whenthe reading drops, press MENU/ESC
key to cancel the test and to go backto the original state.
To 2-0.0

WARNING
Because the contact and gas concentration ouput can be activated by a gas test even in themaintenance mode depending on setting, be careful to perform the test.

<Alarm Test "2-0.1">
LED

2-0.1
Press SET key.

Alarm Test ON/OFF(The used contact setting is an alarm,an alarm or a fault)
Select either ON/OFF, and then press
SET key.
Perform the gas alarm test byincreasing or decreasing the readingwith  or  key.
Press MENU/ESC key to cancel thetest and to go back to the originalstate.

To 2-0.1

WARNING
Because the contact and gas concentration ouput can be activated by an alarm test even in themaintenance mode depending on setting, be careful to perform the test.

- 34 -

7 Maintenance7-2. Regular maintenance mode

<Fault Alarm Test "2-0.2">
LED

2-0.2
Press SET key.

Fault Test ON/OFF
Select either ON/OFF.
Switch ON and press SET key toactivate the fault alarm.
Return to OFF and press SET key todeactivate the fault alarm.
(Pressing MENU/ESC key alsoenables to cancel this menu and to go
back to the original state.)

WARNING
Because the contact and gas concentration output can be activated by a fault alarm test even in themaintenance mode depending on setting, be careful to perform the test.

<LED Test "2-0.3">
LED

2-0.3
Press SET key.

LED Test ON/OFF
Select either ON/OFF.
Switch ON and press SET key to turnon the LED (POWER, ALM, FAULT)
and to display the gas concentrationof 8.8.8.8..
Return to OFF and press SET key todeactivate this menu.
(Pressing MENU/ESC key alsoenables to cancel this menu and to go
back to the original state.)- 35 -

7 Maintenance7-2. Regular maintenance mode

<Memory Test "2-0.4">
LED

2-0.4
Press SET key.

When StA. is displayed, press SET
key again.

When CAL. is displayed, the memory
diagnosis is performed.

When memory is correct as a result of
the diagnosis, PASS is displayed.
Press SET key to go back to theoriginal state.

To 2-0.4

NOTE
When abnormalities are found in memory as a result of the diagnosis, PASS is not displayed. F-RA isdisplayed for the RAM fault, and F-RO is displayed for the ROM fault. For both the RAM fault and ROM fault,
F-RA and F-RO are displayed alternately.

- 36 -

7 Maintenance7-2. Regular maintenance mode

<Environmental Setting "2-4">
Set various operations and functions in the environmental setting.
LED<<Environmental Setting 1>>
2-4. Environmental Setting
Press SET key.

2-4.0
This is factory-set and not
typically used by the user.

2-4.1 INHIBIT Setting
Set INHIBIT.
Select either ON/OFF, and thenpress SET key to confirm theselection.
When ON is selected, in thedetection mode InHI. and 0.0(gas concentration value) aredisplayed on the LCD
alternately. As a result, an alarm
is not triggered to external
device.
Alarm Setpoint Setting=> P372-4.2 Alarm Setpoint Setting
Set the alarm setpoint.

2-4.3 to 2-4.F
They are factory-set and not
typically used by the user.

F
To 2-4.0<Alarm Setpoint Setting "2-4.2">
LED

2-4.2
Press SET key.

Alarm Setpoint Setting
Select the number by pressing
 or  key, and then press
SET key to confirm the value.
(Press MENU/ESC key to go
back to the original state.)

Return to 2-4.2.

NOTE
The value more than 60% of detection range cannot set it.

- 37 -

7 Maintenance7-3. Gas calibration method

7-3. Gas calibration method
Perform a gas calibration in each mode (zero adjustmentmode and span adjustment mode) using the calibration gas.
 Zero adjustment gas
 Span adjustment gas (collected in a gas sampling bag) Gas sampling bags<<SD-1>>

Flow meter
Pump

Gas
sampling
bag

 OUT

P
Needle valve

Exhaust airIN↑

Gas calibration adapter<Zero Adjustment "2-1">
This is used to perform the zero adjustment.

WARNING
When the zero adjustment is performed in the atmosphere, check the atmosphere for freshness before
beginning the adjustment. If other gases exist, the adjustment cannot be performed properly, thus
leading to dangers when the gas leaks.

NOTE Before starting the zero adjustment, provide the detector with the zero adjustment gas and wait until theindicator is stabilized.

- 38 -

7 Maintenance7-3. Gas calibration method
LED

2-1
Press SET key.

Current Concentration Value Display
Press SET key to perform the zeroadjustment.

Under Zero Adjustment (CAL. is displayed)
Wait for a while until the adjustment iscompleted.

Zero Adjustment Completed
It automatically returns to 2-1 after
PASS is displayed.

Return to 2-1.
* If the zero adjustment failed, it
automatically returns to 2-1 after
FAIL is displayed.
Return to 2-1.

NOTE

 If the zero calibration failed since the zero point was significantly fluctuated from around zero, it returns to
2-1 after FAIL rather than PASS is displayed. In this case, the zero adjustment has not been completed.

- 39 -

7 Maintenance7-3. Gas calibration method<Span Adjustment "2-2">This is used to perform the span adjustment.

CAUTION Before starting the span adjustment, provide the detector with the span adjustment gas and wait until
the indicator is stabilized.
 For the EN 60079-29-1 compliant specifications, use the gas with the concentration described in"10.1 Sensing target gas list" for the gas used for span adjustment. For other general specifications,use 1.6 times the concentration of alarm setpoint value (or 40%F.S.).

NOTE An exclusive jig is necessary to perform span adjustment. We recommend that you ask our local sales
office nearest you.

LED

2-2
Press SET key.

Gas Introduction
Introduce a gas, and then press SET key
when the reading is stabilized.
* In case of less than 10% F.S., thiscannot be set.

Span Adjustment
Because the reading will be fixed, selectthe introduced gas concentration bypressing  or  key.
Select the number, and then press SET
key.

Span Adjustment Completed
It automatically returns to 2-2 after PASS
is displayed.

Return to 2-2.
* If the span adjustment failed, it
automatically returns to 2-2 after FAIL
is displayed.
Return to 2-2.

- 40 -

7 Maintenance7-3. Gas calibration method

NOTE If the span adjustment failed since the reading was significantly fluctuated from the introduced gas
concentration, it returns to 2-2 after FAIL rather than PASS is displayed . In this case, the span adjustment
has not been completed.
Check if the correct concentration span adjustment gas has been provided and check the gas adjustment
tool for a gas leak. If there are mistakes, perform the span adjustment again.
If the span adjustment cannot be performed even when there is no mistake or after the correction, the gas
sensor life has expired. After turning off the power supply, please contact our overseas sales department
or local representatives.

- 41 -

7 Maintenance7-4. Parts replacement

7-4. Parts replacement<Sensor Replacement>Gas sensor replacement is according to the following procedures.
(1) Turn off the power supply (24V) to the detector.
(2) After loosened set screw by hex wrench (nominal size 2),remove sensor guard by hex wrench (nominal
size 6).
(3) Remove the sensor. Pinch top of sensor (sintered metal portion) by using finger, and pull out it.
(4) Mount a new sensor. There are five pins for sensor, but a pin is longer than the others to show thereference, and equip detection unit with sensor .When put on the sensor, do NOT scratch mating portionof side of the sensor and adapter inside.
(5) After replacing a sensor, put on a sensor guard and set screw firmly.
(6) After sensor replacement, turn on the power and warm – up, then do the zero - point adjustment andspan adjustment by [7-3．Gas calibration method].
After the fixed, sets screw istightened in hex wrench (nominal
size 2)

SensorSensorHex wrench

Sensorguard
Sensorguard

Turning to
the main body front

When put on the sensor, do NOT
scratch mating portion of side of
the sensor and adapter inside.

NOTE
The gas calibration using the standard gas is required after the sensor is replaced. Please request it to ouroverseas sales department or local representatives.

WARNING Do NOT exchange any parts while turn on electricity. It may happen fire.
 Turn off the power supply, and then replace parts.

- 42 -

7 Maintenance7-4. Parts replacement<Replacement of Regular Replacement Parts>
List of recommended regular replacement parts
No.

Item

Maintenanceintervals

Replacement
intervals (year)

Quantity(pieces/unit)

1

Rubber seal(for the sensor)

6 months

3 - 8 years

1

NOTE

 The above replacement intervals are recommendation only. The intervals may change depending on theoperating conditions. These intervals do not mean the warranty periods either. The result of the regular
maintenance may determine when to replace the parts.

- 43 -

8 Storage, Relocation and Disposal

8-1. Procedures to store the detector or leave it for a long time

8

Storage, Relocation and
Disposal
8-1. Procedures to store the detector or leave it for along time
The detector must be stored under the following environmental conditions.
 In a dark place under the normal temperature and humidity away from direct sunlight In a place where gases, solvents or vapors are not present

8-2. Procedures to relocate the detector or use it again
When the detector is relocated, select a new place in accordance with "4-2. Precautions for installation
points" and "4-4. How to install".
For information on wiring, see "4-5. How to wire". The unpowered time must be minimized when thedetector is relocated.

CAUTION When using a relocated or stopped/stored detector again, do not forget to perform a gas calibration.
For information on readjustment including a gas calibration, please contact our overseas sales
department or local representatives.

8-3. Disposal of products
When the detector is disposed of, it must be treated properly as an industrial waste in accordance with thelocal regulations.

- 44 -

9 Troubleshooting

9 Troubleshooting

9

Troubleshooting
The troubleshooting does not explain the causes of all the malfunctions which occur on the detector. This
simply helps to find the causes of malfunctions which frequently occur. If the detector shows a symptom
which is not explained in this manual, or still has malfunctions even though remedial actions are taken,
please contact our overseas sales department or local representatives.

<Abnormalities on Unit>
Symptom/Display

The power
cannot be turnedon.

Abnormaloperations

Sensorabnormalities
E-1

Systemabnormalities
E-9

FAULT

-

-



Causes
The wiring is not correct.
The terminal plate isremoved.

Actions
Connect the wiring properly.
Connect the terminal plate properly.

Abnormalities/momentary
blackout of power supply
systemProvide the rated voltage.
Check the UPS, power supply line filter andinsulation transformer, and then take additional
measures.

Cable abnormalities(open circuit/not
connected/short circuit)

Check the wiring of detector and related devices
around it.

Disturbances by sudden
surge noise, etc.

Turn off and restart the detector.
If such a symptom is observed frequently, takeappropriate measures to eliminate the noise.

The sensor is notconnected or improperly
connected.
Zero drift caused byenvironmental changes ordegradation over time isoff the threshold.
Faults of the sensor
The rated voltage is not
supplied to the detector.
Abnormalities of ROM,
RAM, or EEPROM insideof the detector
Output signal (4-20mA)
does not work correctly.

- 45 -

Check if the sensor cable is securely fastened tothe terminal plate.
Perform the zero adjustment. If the symptom
persists after the zero adjustment, replace thesensor with a new one.
Replace the sensor with a new one.
Check the power supply, and supply the rated
voltage.
Please contact our overseas sales department
or local representatives.
Check if the cable for external output is correctly
connected. (Deterioration of the cable,
connection of the host system, etc).
If the output is not necessary, connect a
resistance to the terminal as mentioned in P16.
If it is correctly connected, contact our overseas
sales department or local agents because afailure inside this detector might be occurred.

9 Troubleshooting

9 Troubleshooting<Abnormalities of Readings>
Symptoms

CausesDrifting of sensor
outputPresence ofinterference gas

The reading rises(drops) and it remainsso.

Slow leakEnvironmental
changes
Presence ofinterference gas
A gas alarm is triggered
despite of no gas leakand no otherabnormalities at thedetection point.

Disturbance by
noise

Sudden change inthe environment

Deteriorated sensor
sensitivity
Improper calibration
gas concentration
Deteriorated sensor
sensitivity

Slow response
Sensitivity calibration
impossible

Actions
Perform the zero adjustment.
Disturbances by interference gases, such as solvents,
cannot be eliminated completely.
For information on actions, such as removal filter, pleasecontact our overseas sales department or local
representatives.
A very small amount of the gas to be detected may beleaking (slow leak). Because ignoring it may cause
dangers, take a remedial measure, i.e., taking actions thesame as those for the gas alarm.
Perform the zero adjustment (AIR adjustment).
Disturbances by interference gases, such as solvents,
cannot be eliminated completely. For information on
actions, such as removal filter, please contact ouroverseas sales department or local representatives.
Turn off and restart the detector.
If such a symptom is observed frequently, takeappropriate measures to eliminate the noise.
When the environment (temperature, etc.) changes
suddenly, the detector cannot adjust to it and is affectedby it.
In some cases, the detector triggers an indication alarm.
Because the detector cannot be used under sudden andfrequent environmental changes, any preventive actions
should be taken to eliminate them by the user.
Replace the sensor with a new one.
Use the proper calibration gas.
Replace the sensor with a new one.

<Abnormalities of installation environment>
Symptom/Display
Out of operating
temperature
range
E-27

FAULT

Causes―

The environmental
temperature is out of
operating temperaturerange- 46 -

Actions
Operating temperature range-20 to +60℃
If environmental temperature is out of operating
temperature range, countermeasure foradjusting environmental temperature is needed
to be considered.

10 Product Specifications

10-1. List of specifications

10

Product Specifications
10-1. List of specifications
Model
Type
Detection principle
Gas to be detected
Concentration display
Detection range

SD-1
TYPE GP MED EX
Catalytic combustion type
MethaneSeven-segment LED (four-digit)
0 - 100% LEL

Display resolution

0.5% LEL
Diffusion type
25% LEL [standard setting value]
POWER lamp on (green)
Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault common alarm)

Detection method
Alarm setpoint
Power display
External output
Alarm accuracy(under the same conditions)
Response time
(under the same conditions)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self diagnosis
Fault alarm display
Fault alarm pattern
Alarm contact
Contact capacity
Transmission system
Transmission specifications
Transmission cable
Transmission distance
FunctionsPower supply
Power consumption
Cable connecting port
Initial clear
Operating temperatures
Operating humidities
Structure
Explosion-proof structure
Explosion-proof class
Approvals
External dimensions
WeightOuter color

Within ±25% of the alarm setpoint value
Within 30 seconds after providing the gas 1.6 times the alarm setpoint (depending on the gas tobe detected)
One-step alarm (H)ALM lamp on (red)Auto-reset
System abnormalities/sensor abnormalities
FAULT lamp on (yellow)/detail display
Auto-reset
No-voltage contact 1a, de-energized (energized in response to an alarm) or energized(de-energized in response to an alarm)
30 VDC - 0.5 A (resistant load)
3-wire type analog transmission (common cable for power and signal <power, signal, common>)4 - 20 mA DC (linear/load resistance under 300 Ω, resolution divided into 200)
CVVS 1.25mm2 or 2.0mm2 3-core (when the contact is not used)
CVVS 1.25mm2 or 2.0mm2 4-core (when the contact is used)
Less than 1.25km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2
Alarm delay/suppression/zero follower
24 VDC±10%
Maximum 3 W
Adapter A<NPT1/2> or adapter B<NPT3/4> or adapter <M20×1.5> or
Pressure proof packing gland <G3/4> (Compatible cables φ9.6 - 13.0mm in outer diameter)
Approx. 25 seconds-20 - 60ºC (at a constant condition)
Below 95% RH (Non-condensing)
Wall mounting type
Flame-proof enclosures
Ⅱ 2G Ex db ⅡC T5 Gb (ATEX) / Ex db ⅡC T5 Gb (IECEx)
ATEX / IECEx / CE Marking / MEDApprox. 148 (W) x 149 (H) x 88 (D) mm (projection portions excluded)
Approx. 2.0 kg
Munsell 7.5BG5/2- 47 -

10 Product Specifications

10-1. List of specifications

Outline Drawings- 48 -

10 Product Specifications

10-1. List of specifications＜Detectable gas list (MED approved)＞
Detectable gas
MethaneGas code
CH4
Measuring range
0-100 %LEL
LEL concentration
4.4 vol%
Alarm point
25.0 %LEL-20 to +60℃
Operating temperature range
Air velocity range
0 to 6m/s
Normal ± 90°
Orientation limits
Within ±5%FS
Accuracy(under an identical condition)
Time of response
Within 40sec(T90)(under an identical condition)
Span gas concentration
1.80 to 2.60vol%
Span gas flow rate
0.5 ± 0.1 L/min
Conversion factor
Propane 1.72
（5.4.3.3 Response to different gases）
Isobutane 2.00
* The lower explosion limit (LEL) concentration is based on EN 60079-20-1: 2010.

EN 60079-29-1 approved option items
No.
1
2

Item nameCalibration cap
Dedicated control key

Item sub nameSD-1---------

Figure 1

Figure 2- 49 -Part number
4287 9151 60
4286 9200 80

Figure 1
Figure 2

10 Product Specifications

10-2. List of accessories

10-2. List of accessories
 Operating manual .......................... one
 Dedicated handling lever ............... one
 Dedicated control key .................... The supplied quantity depends on the number of units to be delivered.
1 to 10 unitsone
11 to 20 units
two
21 to 50 units
threeover 51 unitsfour

10-3. Detection principle[Catalytic Combustion Type]
When a combustible gas burns on the surface of a oxidation catalyst, the catalytic combustion type sensor
considers resultant combustion heat as temperature and resistance changes in the platinum wire coil, andmeasures their gas concentrations.
This sensor detects any combustible gases. The detection range is from zero to the lower explosive limit.
When a high-concentrated gas over the lower explosive limit comes into contact with the sensor, it may be abreak.

- 50 -

11 Definition of Terms

11 Definition of Terms

11

Definition of Terms
Catalytic
combustion type
Initial clear
Full scale%LEL
Calibration
Zero suppression
Alarm delay time
INHIBIT

This is a principle of the sensor installed in the detector head.
See "10-3. Detection principle" for details.
Output from the detector head fluctuates for a while after turning on the power.
This is a function to prevent triggering alarm during that time.
Maximum value of the detection range.
A unit which the lower explosive limit (LEL) of the combustible gas to be detected is
set to 100.
Adjusts the readings to the calibration gas concentration value by using thecalibration gas.
A function to cut off the specific drifting that the sensor has.
A function which temporarily suspends activation to prevent a false alarm caused
by noise from its outside.
The gas detection function is temporarily suspended during maintenance, etc. ofthe detector.
This is also called "point skip", which has the same function.

- 51 -

Revision History
Edition

Revision

Date issued

0First edition

8/18/2020

1

Complete revision

11/10/2020

2

Declaration of Conformity

11/12/2021

3

P22, 28, 29, 32, 33, 38 Deleted mention of negative suppression values

7/29/2022

42-4 UKEX added, CE DoC changed, UKCA DoC added

10/12/2023

5

UKEX and UKCA deleted, DoC updated

2/5/2024-