PT2E-2936

Smart transmitter/Gas Detector Head

SD-1RI（TYPE MED EX）
Operating Manual(PT2E-195)

Operating Precautions
This detector is a gas detector that detects combustible gases, toxic 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.
Perform zero adjustment regularly (every 1 month).

2.

Do not use the gas detector in a place where the temperature changes drastically (about 10-15℃ ormore).

3.

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.

4.

This is a safety unit, not a control unit.
If use in safety unit, the analog signal output of the detector 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.

5.

Please contact us because a pretreatment device is required for gas sampling from locations with highhumidity, dust, or acid mist.

6.

For maintenance of the gas detector, it is necessary to perform a regular inspection including
replacement adjustment of the regular replacement parts described in the operating manual.

-2-

Operating Precautions<Contents>
1 Outline of the Product .............................................................................................................. 4
1-1. Preface .............................................................................................................................. 4
1-2. Purpose of use .................................................................................................................. 4
1-3. Definition of DANGER, WARNING, CAUTION, and NOTE ............................................... 4
1-4. Method of confirmation for Standards and Explosion proof specification .......................... 5
2 Important Notices on Safety ..................................................................................................... 6
2-1. Danger cases .................................................................................................................... 6
2-2. Warning cases .................................................................................................................. 7
2-3. Precautions ....................................................................................................................... 8
2-4. Safety Information ............................................................................................................. 9
3 Product Components ............................................................................................................... 10
3-1. Gas detector and standard accessories ............................................................................ 10
3-2. Names and functions for each part ................................................................................... 11
3-3. Block diagram ................................................................................................................... 12
4 How to Use............................................................................................................................... 13
4-1. Before using the detector .................................................................................................. 13
4-2. Precautions for installation points...................................................................................... 13
4-3. Precautions for system designing ..................................................................................... 14
4-4. How to install ..................................................................................................................... 16
4-5. Installation procedure ........................................................................................................ 17
4-6. How to wire ....................................................................................................................... 18
5 How to Operate ........................................................................................................................ 225-1. Preparation for start-up ..................................................................................................... 22
5-2. Basic operating procedures............................................................................................... 22
5-3. How to start the detector ................................................................................................... 23
5-4. Modes ............................................................................................................................... 24
5-5. Maintenance Mode(User) .................................................................................................. 25
5-6. How to exit ........................................................................................................................ 27
6 Operations and Functions ........................................................................................................ 28
6-1. Gas alarm activation ......................................................................................................... 28
6-2. Fault alarm activation ........................................................................................................ 29
6-3. Warning activation ............................................................................................................. 29
6-4. External output operation .................................................................................................. 30
6-5. Other functions .................................................................................................................. 31
7 Maintenance............................................................................................................................. 32
7-1. Maintenance intervals and items ....................................................................................... 32
7-2. Maintenance Mode(Regular maintenance) ....................................................................... 34
7-3. Gas calibration method ..................................................................................................... 41
7-4. Parts replacement ............................................................................................................. 45
8 Storage, Relocation and Disposal ............................................................................................ 47
8-1. Procedures to store the detector or leave it for a long time ............................................... 47
8-2. Procedures to relocate the detector or use it again ........................................................... 47
8-3. Disposal of products .......................................................................................................... 47
9 Troubleshooting ........................................................................................................................ 48
10 Product Specifications ............................................................................................................ 50
10-1. List of specifications ........................................................................................................ 50
10-2. Detection principle ........................................................................................................... 53
11 Definition of Terms .................................................................................................................. 54-3-

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-1RI(TYPE 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 fixed type gas detector head that detects leak of combustible gas and has analog signal
output(4-20mA).
 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 outputs gas concentration in 4 – 20 mA.
 The detector has HART communication function. The HART communication function can be used only
during maintenance.
 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.

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.

-4-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-5-

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(The ambient temperature on explosion-proof certification is described above and it indicates thetemperature range which can maintain the explosion-proof performance and not the productperformance, see “10-1. List of specifications” for details.)
 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.
 Nitrile rubber (NBR) is used for the cable gland component. The organic solvents and alkalis (liquid
or vapor) present in the measurement environment may not be able to maintain the explosion-proof
performance.

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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.

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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 thedetector 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 highlyconcentrated vapor) and others are applied to the plate for a long time, its color and shape may bechanged.
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.

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2 Important Notices on Safety

2-4. Safety Information

2-4. Safety Information
Necessary information for explosion proof construction of Model SD-1RI (TYPE MED EX).
The Model SD-1RI is a fixed mount, continuous-monitoring detector head and provides a 4-20mA signal
which indicates the target gas reading for use by a gas monitoring controller, recording device, or
programmable controller.
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 DEK 24.0004X
DEKRA 24ATEX0004 X
II
2G
Ex db IIC T6
Gb-20C to +60C
Supply voltage: 24 VDC±10% (Typ.)
Output signal (4 to 20 mA) : 24VDC 22mA
EN IEC 60079-0: 2018，EN 60079-1: 2014
PT2E-195* The ambient temperature on explosion-proof certification is described above and it indicates thetemperature range which can maintain the explosion-proof performance and not the product performance,
see “10-1. List of specifications” for details.
Specific conditions of “X”-mark:・The property class of the cover screws is at least A*-70.
・The plastic window is submitted to tests corresponding to the low risk of mechanical danger.
・The flameproof joints not intended to be repaired.
Installation
Installation Diagram
Hazardous Location(Zone 1)←→

Nonhazardous Location

Indicator etc.

Gas Detector (SD-1RI)CVVS Cable

24V ＋
GND －
Signal ＋
Signal －24V
GND＋ Signal－ Signal-9-3 Product Components

3-1. Gas detector and standard accessories

3

Product Components
3-1. Gas detector and standard accessories<Main Unit>

Adapter A (NPT1/2)<Standard 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 units
four

CAUTION
Use the supplied dedicated control key to operate the detector. If products other than these accessories
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.

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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 setpointvalue is reached.
Fault lamp. It lights up in yellow when an abnormality isdetected in the detector.
Displays the gas concentration and so on.

- 11 -

3 Product Components

3-3. Block diagram

3-3. Block diagram<Electric Diagram>

Power supply part

Display（POWER）（ALARM）（FAULT)POWER INPUT (24 VDC)
Controller(CPU)
Transmitter

Seven-segment LED(four-digit)
Magnetic operation part
(MENU/ESC) (▲) (▼)(S )・4 – 20 mA transmission
・HART Communication*

Sensor*Used only for maintenance.

- 12 -

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 theoperating 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
that are 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.
*For operating temperature range, see “10-1. List of specifications” for details.

- 13 -

4 How to Use

4-3. Precautions for system designing

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.
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 isperformed 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 ina 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 of the detector may be activated when the power is turned on, when momentary
blackout occurs, or when the system is being stabilized. In such cases, use a UPS, or take appropriate
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 30 milliseconds(To recover from the momentary
blackout for 30 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.
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4 How to Use

4-3. Precautions for system designing

Take appropriate measures in accordance with the importance of the facilities
and the environment.
Protection against  Provide protection by a lightning arrester (cable safety retainer).
(Although inductive lightning surge can be transmitted through the cable, it islightning
prevented by installing a lightning arrester before the field devices and central
processing equipment. For information on how to use a lightning arrester,
please contact the manufacturer.)
In addition to lightning, there are more sources of surge noise. To protect units
Groundingfrom these noise sources, the units must be grounded.
* The lightning arrester has a circuit to remove a surge voltage which damages field devices, so thatsignals may be attenuated. Before installing a lightning arrester, verify that it works properly.

- 15 -

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- 16 -

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- 17 -

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-wire4-wireCVVS1.25 mm2 or 2.0mm2 - 3-core
CVVS1.25 mm2 or 2.0mm2 - 4-core<Figure of Terminal Plate>
DC+

1

DC-

2

Sig+

3

Sig-

4

DC24V

4-20mA+
HART

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)- 18 -

4 How to Use

4-6. How to wire

<When 4-20mA output is not used>
This detector has a self-diagnosis function which shows E-9 on LED display when 4-20mA is not properly
outputted.
If 4-20mA output is not necessary, connect the following fixed resistance (lead type) to the terminal 2 and 3(”Sig+” and “-(common)”).
Resistance value : 100-300Ω
Rated power : 0.25W or more
Insert a cable and the above resistance together into Terminal 2 (common), and insert lead part of theresistance into terminal 3 (Sig+). After that, check the immovability.

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. Thismay 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.

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4 How to Use

4-6. How to wire

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.)- 20 -

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.
 To connect the grounding wire to the internal grounding terminal of the main unit, use crimp terminal,
and use external grounding wire with a cross sectional area of 4 mm2 or more for the external
grounding terminal.

<Wiring Example>
Connecting to the indicator

SD-1RI
1 2 3 4

RM-5000, etc.
+24 V
GND
Sig

Connecting to the upper unit (DCS, PLC)

SD-1RI
1 2 3 4

Power supply(24 VDC)

Relay terminal
plate

+
-

Upper unit
(DCS, PLC)+

CAUTIONIf HART communication is used, check so that wiring load resistance that constitute 4-20mA loops,
amount to 250 Ω-300 Ω.
- 21 -

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.

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)≪Maintenance Mode≫(User)
LED

LED

LED

LED

- 22 -

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

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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

ROM/SUM Display

1-0

Zero Adjustment
Setting Display
Switch to the regular
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.

Test Mode

2-0

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

Zero Adjustment
Span Adjustment
Zero/Span Initialization

2-1
2-2
2-3

Environmental Setting

2-4

Normal state

Perform the zero adjustment.
Perform the span adjustment.
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
2-4.5 Zero Suppression Pattern Setting
2-4.6 Zero Suppression Value Setting
2-4.7 Not used
2-4.8 Not used
2-4.9 Not used
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 Temperature Compensation
Coefficient Setting
2-4.E Password Setting
2-4.F Sensor Fault Alarm Pattern Setting
2-4.H Sensor Voltage Standardize

Maintenance
Mode(Regularmaintenance)

Adjustment

Display

2-5

Switch to factory mode
Switch to user mode

2-6
2-7

2-4.I Sensor Output Record
Display various electrical settings.
This is not typically used by the user.
Not used
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.

- 24 -

5 How to Operate

5-5. Maintenance Mode(User)

5-5. Maintenance Mode(User)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⇒ Page 26

Show Various Settings⇒ Page 27

Switch to the regular
maintenance mode.
This is not typicallyused by the user.

Pass word:0405- 25 -

5 How to Operate

5-5. Maintenance Mode(User)<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.

- 26 -

5 How to Operate

5-6. How to exit

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

Press SET key.

6.0

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 terminal of the detector.

- 27 -

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.

<Alarm Activation>
It lights up when the gas concentration reaches or exceeds the alarm setpoint value.
The Alarm activation is reset automatically when the gas concentration drops below the alarm setpointvalue.

Concentration

Alarm setpoint

0

Time

Alarm lamp (ALM)
Alarm delay time (2 seconds)- 28 -

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
right after 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".

6-3. Warning activation
When the environmental temperature exceeds the operating temperature of the detector, gasconcentration and warning number [E-27] are shown alternately. Since this case is not failure, still thedetector works. It outputs 4-20mA depending on gas concentration and does not light up failure lamp.
Operating temperature：-20 - +60℃(non-rapidly-vary)- 29 -

6 Operations and Functions

6-4. External output operation

6-4. 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
Out of operating temperature
range
7
Fault Alarm
8
INHIBIT
9
Alarm Test Mode
1011

User Mode
Maintenance Mode

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

Example of Gas Concentration and External Output
4 - 20 mA specification
External output
20.5 mA
20 mA

Detection Mode
User Mode
Maintenance Mode
(Standard:2.5mA fixed)

4 mA
2.5 mA
Zero suppression0

Gas concentration
Full scale
20mA output

Full scale over
20.5mA fixed output

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 is based on 4 - 20 mA output setting in the maintenance mode.
(Standard: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.

- 30 -

6 Operations and Functions

6-5. Other functions

6-5. 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
fluctuation of 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 5% FS.
 In the Zero adjustment mode, this function is disabled and the fluctuation of the reading below thesetting 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.

- 31 -

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
Gas 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.

- 32 -

7 Maintenance7-1. Maintenance intervals and items

Main Services
Power Supply
Check

:

Concentration
Display Check:

Alarm Test:

Gas 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.
Inspects the alarm circuit by using the alarm test function.
• Checks the alarm lamps. (Checks ALM activation.)• 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. (Checks ALM activation.)• 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.

- 33 -

7 Maintenance7-2. Maintenance Mode(Regular maintenance)

7-2. Maintenance Mode(Regular maintenance)
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

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.

Maintenance Mode
(Regularmaintenance)
Environmental Setting

2-4

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 Not used
2-4.8 Not used
2-4.9 Not used
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 Temperature Compensation
Coefficient Setting
2-4.E Password Setting
2-4.F Sensor Fault Alarm Pattern Setting
2-4.H Sensor Voltage Standardize
Adjustment

Display

2-5

Switch to factory mode
Switch to user mode

2-6
2-7

2-4.I Sensor Output Record
Display various electrical settings.
This is not typically used by the user.
Not used
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
5.0% FS- 34 -

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

7 Maintenance7-2. Maintenance Mode(Regular maintenance)
LED

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

Then press SET key again
for three seconds.

0000

Maintenance Mode
2-0. Test Mode
Perform various tests.

Test Mode=> P362-1. Zero Adjustment
Perform the zeroadjustment.

Zero Adjustment=> P422-2. Span Adjustment
Perform the span
adjustment.

Span
Adjustment=> P432-3. Zero/Span Initialization
Initialize the zero/span
adjustment after the sensor
is replaced.
2-4. Environmental Setting
Set various operations andfunctions.

Environmental
Setting=> P402-4.0 and 2-4.3 to 2-4.I 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 returnto the usermode.
To 2-0. Test Mode
- 35 -

7 Maintenance7-2. Maintenance Mode(Regular maintenance)<Test Mode "2-0">
LED

2-0
Press SET key.

2-0.0 Gas Test

Gas Test=> P372-0.1 Alarm Test

Alarm Test=> P372-0.2 Fault Test

Fault Test=> P382-0.3 LED Test

LED Test=> P382-0.4 Memory Test

Memory Test=> P39

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). After the test is completed, neverfail to press MENU/ESC key to return to the detection mode. (If the detector remains in the alarm testmode, 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.

- 36 -

7 Maintenance7-2. Maintenance Mode(Regular maintenance)<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 theand gasconcentration
output can
activated
by in
a gas
test even in the
gascontact
concentration
outputcan be activatedby abegas
test eventhe maintenancemode
maintenancedependingcarefuldepending onmodesetting,
be carefulontosetting,performbethe
test. to perform the test.

<Alarm Test "2-0.1">
LED

2-0.1
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 gas concentration output can be activated by an alarm test even in the maintenance mode
depending on setting, be careful to perform the test.

- 37 -

7 Maintenance7-2. Maintenance Mode(Regular maintenance)<Fault 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 togo back to the original state.)

WARNING
Because gas concentration output can be activated by a fault test even in the maintenance 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 togo back to the original state.)- 38 -

7 Maintenance7-2. Maintenance Mode(Regular maintenance)<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 resultof 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.

- 39 -

7 Maintenance7-2. Maintenance Mode(Regular maintenance)<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=> P402-4.2 Alarm Setpoint Setting
Set the alarm setpoint.

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

2-4.3～2-4.I
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.

- 40 -

7 Maintenance7-3. Gas calibration method

7-3. Gas calibration method(1) Pipe is attached as shown by the figure below.
With type of calibration gas, pipe configuration is targeted by "pushing type" or "suction type".
When calibrate with solvent gas, only “suction type” and Teflon tube can be allowed. (Length of gas
sampling bag and gas calibration adapter tube is within 30cm.)(2) Perform a gas calibration in each mode (zero adjustment mode and span adjustment mode) using thecalibration gas.
 Zero adjustment gas
 Span adjustment gas (collected in a gas sampling bag) Gas sampling bags
*Use a tedlar bag when make gas from solvent to prevent adsorption.
(3) It is recommended that zero adjustment and span adjustment be performed after one hour or more has
elapsed since turning on the power. Also, after introducing zero adjustment and span adjustment gas
for 120 seconds or longer, perform each operation.
Pushing type (calibration gas: Gas)<<SD-1RI>>

Flow meter
Setting：1.0±0.5 L/min
Pump

Gas
sampling
bag

 OUT

P

Exhaust air

IN↑

Needle valve

Gas calibration adapter

Suction type (calibration gas: Gas or solvent gas)

《SD≪SD-1RI≫

Teflon tube
（within30cm）

Pump
P

Gas
sampling
bag

IN→

→ OUT

流量
Exhaust air

Needle valve
Flow meter

Gas calibration adapter- 41 -

Setting：1.0±0.1
Setting：1.0±0.5 L/min

7 Maintenance7-3. Gas calibration method<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.
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.

- 42 -

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(adequate 1.6
times thicker gas than alarm setpoint value or 40% F.S.) 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.

50.0
25.0

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.

- 43 -

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.

- 44 -

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.

- 45 -

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

Guard assembly

6 months

3 - 8 years

1※ After replacements having need of operation check by professional service engineers.
To maintain the safety operation of the detector, please use our maintenance service.
Request RIKEN KEIKI for it.

NOTE

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

- 46 -

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 "4-6. 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.

- 47 -

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

FAULT

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

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 or
aging deterioration is outof the range of thethreshold
Faults of the sensor-

The rated voltage is not
supplied to the detector.

Systemabnormalities
E-9

Actions
Connect the wiring properly.

Check if the sensor cable is securely fastened
to the 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. It occurs when the voltage of the power
supply falls below 17.0 V.

Abnormalities of ROM,
RAM or EEPROM insideof the detector

Please contact our overseas sales department
or local representatives.

Output signal (4-20mA)
does not work correctly.

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.

- 48 -

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
Disturbance bynoise

A gas alarm is triggered
despite of no gas leakand no otherabnormalities at thedetection point.

Sudden change inthe environment

Deteriorated sensor
sensitivity
Improper calibration
gas concentration
Deteriorated sensor
sensitivity

Slow response
Sensitivity calibration
impossible

Actions
Perform the zero adjustment.
Interference gas test including solvents are identified,and be treated properly.
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
the same as those for the gas alarm.
Perform the zero adjustment (AIR adjustment).
Interference gas test including solvents are identified,and be treated properly.
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 temperature
range- 49 -

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
Detection gas
Gas concentration display
Detection range
Resolution
Detection method
Alarm setpoints
Power display
OutputAlarm accuracy(under an identical condition)
Alarm-delay time
(under an identical condition)
Gas alarm typeGas alarm display
Gas alarm patternFault alarm・Self diagnosis
Fault alarm display
Fault alarm pattern
Transmission scheme
Transmission specification
Communication scheme
Transmission cable
Transmission distance
FunctionsPower supply
Power consumption
Cabling port

SD-1RITYPE MED EX
Non-dispersive infrared absorption method
Combustible gas/Toxic gas
LED(4digits・7segments)
Depend on detection gas
Depend on detection gas
Diffusion method
Depend on detection gas
POWER lamp lighting(green)
Gas concentration signal (4-20mA output)
Within ±25% to the alarm setpoints value
Within 30sec(when introducing 1.6 times thicker gas than alarm setpoints value)
Single alarm(H)ALM lamp lighting(red)Auto-recover
System failure (E-9)/Sensor failure (E-1)
FAULT lamp lighting(yellow)/Error number display
System failure : Self-latching
Sensor failure : Auto-recoverThree-wire analog transmission(in common with power supply<power supply,signal,common>)or Two-wire analog transmission + digital transmission(HART communication)
4 - 20mADC(linear・load resistance less than 300Ω)
HART 7 (For maintenance function only)
CVVS worth of shield cable(1.25mm2)･4-core or 3-core
CVVS worth of shield cable(2.0mm2)･4-core or 3-coreLess than 1.25km in case of CVVS 1.25mm2
Less than 2.0km in case of CVVS 2.0mm2
Alarm delay/Suppress/HART communication
24VDC±10%MAX.2W
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.25sec-20 to +60℃ (non-rapidly-vary)Less than 95%RH (non-condensing)
80 to 120kPa-25 to +60℃ (non-rapidly-vary, non-condensing)
Wall mounting type
Flame proof structure

Initial clear
Operating temperature range*
Operating humidity range
Operating pressure range*
Storage temperature range
Structure
Explosion protected
construction
Ⅱ 2 G Ex db ⅡC T6 Gb(ATEX) / Ex db ⅡC T6 Gb(IECEx)
Explosion-proof class
Dimensions
Approx.148(W)×149(H)×88(D)mm(projection portions excluded)
WeightApprox.2.0kg
Color
Munsell 7.5BG5/2* The ambient temperature range which maintain a capability of explosion proof of the label on the detector is -20 to +60℃.
However, the available operating temperature range is different depending on detectable gas.

- 50 -

10 Product Specifications

10-1. List of specifications

Outline Drawings

Adapter A(NPT1/2)- 51 -

10 Product Specifications

10-1. List of specifications＜Detectable gas list (MED specification)＞
Detectable gas
Gas code
Measuring range
LEL concentration
Alarm point
Operating temperature range
Air velocity range
Orientation limits
Accuracy(under an identical condition)
Repeatability(under an identical condition)
Time of response

MethaneCH40-100 %LEL/0-100vol%4.4 vol%
25.0 %LEL-20 to +60℃
0 to 6m/s
Normal ± 90°
Within ±5% FS

PropaneC3H80-100 %LEL
1.7 vol%
25.0 %LEL-20 to +60℃
0 to 6m/s
Normal ± 90°
Within ±5% FS

Isobutane
i-C4H100-100 %LEL
1.3 vol%
25.0 %LEL-20 to +60℃
0 to 6m/s
Normal ± 90°
Within ±5% FS

Within ±2% FS

Within ±2% FS

Within ±2% FS

Increasing concentration
Increasing concentration
T50 Within 20sec
T50 Within 20sec
T90 Within 40sec
T90 Within 40sec
Decreasing concentration
Decreasing concentration
T50 Within 20sec
T50 Within 20sec
T90 Within 40sec
T90 Within 40sec
Span gas concentration
0-100 %LEL: 1.80 to 2.60 vol%0.70 to 1.20vol%0-100 vol%: 45.0 to 55.0 vol%Span gas flow rate
1.0 ± 0.5 L/min
1.0 ± 0.5 L/min* The lower explosion limit (LEL) concentration is based on EN 60079-20-1: 20xx.

Increasing concentration
T50 Within 20sec
T90 Within 40sec
Decreasing concentration
T50 Within 20sec
T90 Within 40sec
0.55 to 0.95vol%1.0 ± 0.5 L/min

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

Item nameCalibration cap
Dedicated control key

Item sub name
SD-1RI---------

Figure 1

Figure 2- 52 -Part number
4287 9151 60
4286 9200 80

Figure 1
Figure 2

10 Product Specifications

10-2. Detection principle

10-2. Detection principle
Model SD-1RI is based on NDIR (Non-Dispersive Infrared) and this structure is shown below.
The infrared beam emitted from the light source passes through the gas cell, and optical band pass filter
which can pass the absorption wave of measuring gas and attains gas cell is absorbed by the measuringgas when measuring gas is supplied into the gas cell and will decrease according to its concentration.
The variable amount of infrared ray is measured by the infrared sensor and it is displayed as gas
concentration.
Then, there is no sensitivity against gas which have the different absorption wave from the measuring gas.
Then there is no sensitivity against N2 and H2 etc which cannot absorb infrared. As compared with theconventional catalytic combustion method, there is no poisoning material to be absorbed and almost no
sensitivity drop on this detection principle.
The light source, gas cell, infrared sensor etc are housed in a flame arrestor to be an explosion (flame)
proof structure.

Reflective mirror

Flame arrester

InfraredGas cell
Detectable gas

Optical filter

Light source

Infrared sensor
Gas concentration
Analog output- 53 -

11 Definition of Terms

11 Definition of Terms

11

Definition of Terms
Non-dispersive
infrared type
Initial clear
Full scale
%LEL
vol%
Calibration
Zero suppression
INHIBIT
HART
communication

This is a principle of the sensor installed in the detector head.
See "10-2. 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.
A unit used to express the percentage of a specific substance (or gas) in a volume
of solution.
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.
The gas detection function is temporarily suspended during maintenance, etc. ofthe detector.
This is also called "point skip", which has the same function.
4-20mA DC signal digitals signalling is superimposed, and is methods thattransmit multiple signals.

- 54 -

Revision History
Edition

Revision

Date issued

0First edition

7/2/2020

1

Safety information, Declaration of Conformity

11/30/2020

2

P23 Warm-up time deleted
P28 Changed to auto-reset operation
P32 Added to “Ground wire check” maintenance items
P50 Correction of specifications
P52 Added CH4 0-100vol% to the list of gases to be detected(MED specification)
P54 Added “vol%” to the definition of terms

1/5/2021

3

Declaration of Conformity

11/12/2021

4

P25, 31, 32, 35, 36, 41 Deleted mention of negative suppression values
P36 Deleted information regarding password entry when transitioning tomaintenance mode.

7/29/2022

5

Safety information, Declaration of Conformity

12/13/2022

6

UKEX and UKCA deleted, Safety information corrected, Declaration ofConformity updated

2/19/2024