PT2E-2603

Smart Transmitter/Gas Detector Head

SD-1GH<Taiwan Ex(TS) Specifications>Operating Manual(PT2E-169)(PT2-169)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.

<Contents>
1
1-1.
1-2.
1-3.
1-4.

Outline of the Product ..................................................................................................... 2
Preface ........................................................................................................................... 2
Purpose of use ............................................................................................................... 2
Definition of DANGER, WARNING, CAUTION, and NOTE............................................. 2
Method of confirmation for Standards and Explosion proof specification ........................ 3

2
2-1.
2-2.
2-3.
2-4.

Important Notices on Safety ............................................................................................ 4
Danger cases ................................................................................................................. 4
Warning cases ................................................................................................................ 5
Precautions..................................................................................................................... 6
Safety information ........................................................................................................... 7

3
Product Components....................................................................................................... 8
3-1. Main unit and standard accessories ............................................................................... 8
3-2. Names and functions for each part ................................................................................. 9
3-3. Block diagram ................................................................................................................. 10
4
4-1.
4-2.
4-3.
4-4.
4-5.
4-6.

How to Use...................................................................................................................... 11
Before using the detector................................................................................................ 11
Precautions for installation points ................................................................................... 11
Precautions for system designing ................................................................................... 12
How to install .................................................................................................................. 14
Installation procedure ..................................................................................................... 15
How to wire ..................................................................................................................... 17

5
5-1.
5-2.
5-3.
5-4.
5-5.
5-6.

How to Operate ............................................................................................................... 21
Preparation for start-up ................................................................................................... 21
Basic operating procedures ............................................................................................ 21
How to start the detector................................................................................................. 22
Modes ............................................................................................................................. 24
Maintenance Mode (User mode) .................................................................................... 25
How to exit ...................................................................................................................... 27

6
6-1.
6-2.
6-3.
6-4.

Operations and Functions ............................................................................................... 28
Gas alarm activation ....................................................................................................... 28
Fault alarm activation ..................................................................................................... 29
External output operation................................................................................................ 30
Other functions ............................................................................................................... 31

7
7-1.
7-2.
7-3.
7-4.

Maintenance.................................................................................................................... 32
Maintenance intervals and items .................................................................................... 32
Maintenance mode(Regular maintenance mode) ........................................................... 34
Gas calibration method ................................................................................................... 43
Parts replacement .......................................................................................................... 46

8
Storage, Relocation and Disposal ................................................................................... 48
8-1. Procedures to store the detector or leave it for a long time ............................................ 48
8-2. Procedures to relocate the detector or use it again ........................................................ 48
8-3. Disposal of products ....................................................................................................... 48
9Troubleshooting............................................................................................................... 49

10
Product Specifications ..................................................................................................... 51
10-1. List of specifications ........................................................................................................ 51
10-2. Detection principle ........................................................................................................... 52
11

Definition of Terms........................................................................................................... 53-1-

SD-1GH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-1GH. This manual is Industrial
Technology Research Institute specifications (hereinafter referred to as Taiwan Ex(TS) specifications).
Please check that the model number of the product you purchased is included in the specifications on thismanual.
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.
Although the number of digits to display varies depending on the detection range, this manual provides
explanation using a detection range from 0 to 2000ppm as examples (such as examples of LED display).

1-2. Purpose of use
 This detector is a fixed type gas detector head that detects leak of combustible/toxic gases and performs
the alarm activation when the gas concentration is over the setting value.
 The 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) withthe built-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

SD-1GHDANGER

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

WARNING

This message indicates that improper handling may cause serious damage on
health or assets.

CAUTION

This message indicates that improper handling may cause minor damage on
health or assets.

NOTE

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.

Taiwan Ex(TS) specifications name plate-3-

SD-1GH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 :Taiwan Ex(TS) specifications : -20 to +60℃
 Do not replace parts at your sole discretion but contact RIKEN KEIKI if the transparent window
has a crack or the explosion-proof joint surface is abnormal, or the clamping screw or bolt ischanged, lost etc.
 Do not repair the explosion-proof joint surface.
 Be careful not to hit sharp tools against the window plate.

SD-1GH-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 arefound in 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 gas alarm
Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based onyour judgment.

-5-

SD-1GH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 indication reading. If atransceiver is used, 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 otherunits.
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
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 deteriorate the sensitivity of the sensor, thus
resulting in inaccurate gas detection.

SD-1GH

-6-

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(1) MENU/ESC key(3) ▲ key(8) Concentration
value display(4) ▼ key(2) SET key(1)

MENU/ESC key

Used to enter the maintenance mode.
It is also used to cancel in a specific mode.

(2)

SET key

It is used for value confirmation and so on in a specific mode.

(3)

▲ key

Used to switch menus or change a value (UP).

(4)

▼ key

Used to switch menus or change a value (DOWN).

(5)Power lamp

Power lamp:
Detection mode: It lights up in green.
Maintenance mode: It blinks in green.

(6)

Alarm lamp

Alarm lamp. It lights up in red when the alarm setpoint value isreached.

(7)

Fault lamp

Fault lamp. It lights up in yellow when an abnormality is detected in
the detector.

(8)

Concentration value display

Displays the gas concentration and so on.

-9-SD-1GH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)

1. Gas alarm contact (ALARM)
or
2. Fault contact (FAULT)
or
3. Select either gas alarm orcontact (ALARM/FAULT)

Seven-segment LED(four-digit)
Magnetic operation part
(MENU/ESC) (▲) (▼) (SET)Contact activation
 De-energized (De-energized
at a normal state) ON-ALARM (Closed contact
at an alarm state)
SensorTransmitter 4 – 20 mA transmission

SD-1GH- 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.

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 ofthe detector as needed must be installed in appropriate points.
Because points where gases leak and remain easily are different depending on the types of gases
and the working areas, please decide carefully on installation points and the number of units to beinstalled.

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.
<Taiwan Ex(TS) Specifications> -20 to +60ºC
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 devices exist.

- 11 -

SD-1GH4 How to Use

4-3. Precautions for system designing

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 while 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
voltage

24 VDC ±10%: Terminal voltage of the detector

Allowed time of
momentary blackout

Up to 10 milliseconds(To recover from the momentary
blackout for 10 milliseconds or more,restart the detector.)

Example of actions
To ensure continuous operation andactivation, install a UPS outside thedetector.

OthersDo not use it with a power supply oflarge power load or high-frequency
noise.

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 arrester).
(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,
please contact the manufacturer.)

GroundingIn addition to lightning, there are more sources of surge noise. To protect units
from these noise sources, the units must be grounded.

SD-1GH- 12 -

4 How to Use

4-3. Precautions for system designing* 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.
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 principle, do not activate inductive load at the alarm contact of the detector. (In particular,
never use the inductive load to activate a fluorescent lamp or motor.) If inductive load is activated, relay it with an external relay (contact amplification). However,
because the coil 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 the sametime, 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.

Coil

Alarm contact

Load

Power
supplyPowersupplyExternal relay(low voltage relay)- 13 -*SK1, SK2: Surge absorbing parts

SD-1GH4 How to Use

4-4. How to install

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

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 bolt fixing the lid and the main body with a tightening torque of 215.6±24.5N･cm.
 When closing the lid of the detector, make sure that there is no dust on screw, surfaces of the main bodyand lid. Then apply grease as specified by RIKEN KEIKI.

CAUTION
Do not install the detector in a place where maintenance of the detector cannot be performed orwhere handling 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 installthe detector in a place where maintenance involves dangers, for example, near a high-voltage
cable.

NOTE
・Hexagon socket head cap bolt with strength class "A2-70" are used.
When you lost or replace it, we recommend that you ask our local sales office nearest you.
・Grease specified by RIKEN KEIKI : 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

SD-1GH- 14 -

4 How to Use

4-5. Installation procedure

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

SD-1GH- 16 -

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 toapply 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
and signal 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)

CVVS1.25 mm2 or 2.0mm2 - 3-core

5-wire (when the contact is used)

CVVS1.25 mm2 or 2.0mm2 - 5-core<Parts. length table of outside conductor lead-in>(Taiwan Ex(TS) specifications)
Cable overall outer
diameter(mm)Rubber seal innerdiameter(mm)Washer innerdiameter(mm)Eccentric washer
inner diameter(mm)From Φ9.6 to Φ10.5

Φ11

Φ12

Φ10.8

From Φ10.5 to Φ11.5

Φ12

Φ12

Φ11.8

From Φ11.5 to Φ12.5

Φ13

Φ14

Φ12.8

From Φ12.5 to Φ13.0

Φ13.5

Φ14

Φ13.8

φ23

Eccentric Washer- 17 -

SD-1GH

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
not connect 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 withoutlooseness or twist.
 Use ring terminals to connect the grounding terminal with the ground and use the grounding wirewith cross-sectional area of 4 mm2 or more for the external grounding terminal.

<Wiring Example>
Connecting to the indicator
SD-1GH
1 2 3 4 5
RM-593, etc.
+24 V
GND
Sig

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

Relay terminal
plate

Upper unit
(DCS, PLC)－＋

SD-1GH- 20 -

5 How to Operate

5-3. How to start the detector

NOTE
The semiconductor sensor used in the detector must be warmed up for a specified warm-up (powered)time after power is supplied. The required warm-up (powered) time depends on the unpowered time forthe sensor. The time shown in the table shown below must be met.
Unpowered time

Guidelines for warm-up(powered) time
4 hours or more
24 hours or more
2 days or more
7 days or more
14 days or more
1 month or more

24 hours or less
72 hours or less10 days or lessLess than 1 month
Less than 3 month
3 months or more

- 23 -

SD-1GH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

Item

Detection Mode
ROM/SUM Display
Maintenance Mode
(user mode)

Maintenance Mode(regularmaintenancemode)

SD-1GHLED display

Details

Gas
concentration

Normal state

1-0

Show the program version and others.
This is not typically used by the user.

Zero Adjustment

1-1

Perform the zero adjustment.

Setting Display

1-2

Show various setting values.

Switch to
Maintenance Mode

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

2-1

Perform the zero adjustment.

Span Adjustment

2-2

Perform the span adjustment.

Zero/Span
Initialization

2-3

Initialize zero/span values.

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 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 Adjustment
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
2-4.H LOAD Voltage Adjustment

Display

2-5

Display various electrical settings.
This 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.

- 24 -

6 Operations and Functions

6-1. Gas alarm activation

6

Operations and Functions
6-1. Gas alarm activation
Gas alarm: Triggered 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 thedetector to prevent 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)

SD-1GH- 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 thencheck that the gas concentration reading dropped.
 Access the gas leak point, equipped with a protective gear to avoid dangers caused by possibly
remaining gases, and check whether gases remain or not by using a portable gas detector.
 Check that the point is free from dangers, and take actions to fix the gas leak.

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 LED. 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 RIKEN KEIKI 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".

- 29 -

SD-1GH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 10% FS.
 In the maintenance mode, this function is disabled and the fluctuation of the reading under the setting
value is displayed.

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 and span adjustment.

- 31 -

SD-1GH

7 Maintenance7-1. Maintenance intervals and items

7

MaintenanceThe detector 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 a 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
item

Maintenance content

Daily
maintenance

Monthly
maintenanceRegularmaintenance







Power Supply
Check

Check that the power lamp lights up.

Concentration
Display Check

Check that the concentration display
value is zero. When the reading isincorrect, perform the zero adjustment
and span adjustment after ensuring thatno other gases exist around it.







Alarm Test

Inspect the alarm circuit by using thealarm test function.







Span
Adjustment

Perform the span adjustment by using
the calibration gas.







Gas Alarm
Check

Check the gas alarm by using thecalibration gas.







SD-1GH- 32 -

7 Maintenance7-1. Maintenance intervals and items<About Maintenance Services> We provide services on regular maintenance including span adjustment, other adjustments andmaintenance.
To make the calibration gas, dedicated tools, such as a gas cylinder of the specified concentration andgas 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 RIKEN KEIKI.
Main Services
Power Supply Check:

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 theoperation with the UPS.)

Concentration Display Check:

Verifies that the concentration display value is zero (or 20.9 vol% on theoxygen deficiency meter) by using the zero gas.
Performs the zero adjustment (fresh air adjustment) if the reading isincorrect.

Flow Rate Check:

Checks the flow rate indicator to find abnormalities.
Checks the flow rate by using an external flow meter to verify thecorrectness of the flow rate indicator on the detector. If the flow rate isincorrect, performs the flow rate adjustment.

Filter Check:

Checks the dust filter for dust or clogging.
Replaces a dirty or clogged dust filter.

Alarm Test:

Inspects the alarm circuit by using the alarm test function.
 Checks the alarm lamps. (Checks each activation of ALM1 and ALM2.)
 Checks the external alarm. (Checks the activation of the external alarm,such as a buzzer.)

Span Adjustment:

Performs the span adjustment by using the calibration gas.

Gas Alarm Check:

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 istriggered.) Checks the alarm lamps. (Checks each activation of ALM1 and ALM2.)
 Checks the external alarm. (Checks the activation of external alarms,
such as a buzzer and reset signal.)

Cleaning and Repair of Detector(visual diagnosis):

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.

Detector Operation Check:

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

Replacement of Consumable Parts:

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

- 33 -

SD-1GH

7 Maintenance7-2. Maintenance mode(Regular maintenance mode)

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

Mode

MaintenanceMode(regularmaintenancemode)

SD-1GHLED
display

Details

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

2-1

Perform the zero adjustment.

Span Adjustment

2-2

Perform the span adjustment.

Zero/Span Initialization

2-3

Initialize zero/span values.

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 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 Adjustment
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
2-4.H LOAD Voltage Adjustment

Display

2-5

Display various electrical settings.
This 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.

Item- 34 -

7 Maintenance7-2. Maintenance mode(Regular maintenance mode)

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

rET. is displayed.
Press the SET key
again to return to theuser mode.

2-7.
Return to the user mode.

To 2-0. Test Mode

SD-1GH- 36 -

7 Maintenance7-4. Parts replacement

NOTE Tighten the set screw of the sensor guard at 107.8±12.7N･cm.
 The gas calibration using the standard gas is required after the sensor is replaced. Please request it to ouroverseas sales department or local representatives.
 Grease specified by RIKEN KEIKI : 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

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

<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 dependingon the operating conditions. These intervals do not mean the warranty periods either. The result of
the regular maintenance may determine when to replace the parts.

- 47 -

SD-1GH

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 RIKEN
KEIKI.

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.

SD-1GH- 48 -

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 RIKEN KEIKI.

<Abnormalities on Unit>
Symptom/Display

The power
cannot be turnedon.

Abnormaloperations
Sensorabnormalities
E-1

Systemabnormalities
E-9

FAULT

―

―





CausesActions

The wiring is not correct.

Connect the wiring properly.

The terminal plate isremoved.

Connect the terminal plate properly.

Abnormalities/momentary
blackout of power supply
systemProvide the rated voltage.
Take measures such as checking or adding
the UPS, power supply line filter andinsulation transformer.

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,
take appropriate measures to eliminate thenoise.

The sensor is notconnected or improperly
connected.

Check if the cable is securely fastened to theterminal plate.

Faults of the sensor

Replace the sensor with a new one.

The rated voltage is not
supplied to the detector.

Check the power supply, and supply the
rated voltage.

Abnormalities of ROM,
RAM, or EEPROM insideof the detector

Please contact RIKEN KEIKI.

- 49 -

SD-1GH9 Troubleshooting<Abnormalities of Readings>
Symptoms

The reading rises(drops) and it remainsso.

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

Slow response

Span adjustment
impossible

SD-1GH

CausesActions

Drifting of sensor
outputPerform the zero adjustment and the span
adjustment.

Presence ofinterference gas

Disturbances by interference gases, such as solvents,
cannot be eliminated completely.

Slow leakA 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.

Environmental
changes

Perform the zero adjustment and the span
adjustment.

Presence ofinterference gas

Disturbances by interference gases, such as solvents,
cannot be eliminated completely.

Disturbance bynoiseTurn off and restart the detector.
If such a symptom is observed frequently,
take appropriate measures to eliminate the noise.

Sudden change inthe environment

When the environment (temperature, etc.) changes
suddenly, the detector cannot adjust to it and isaffected by it. In some cases, the detector triggers anindication alarm.
Because the detector cannot be used under sudden
and frequent environmental changes, any preventive
actions to eliminate them should be taken by the user.

Deteriorated sensor
sensitivity

Replace the sensor with a new one.

Improper calibration
gas concentration

Use the proper calibration gas.

Deteriorated sensor
sensitivity

Replace the sensor with a new one.

- 50 -

10 Product Specifications

10-1. List of specifications

10

Product Specifications
10-1. List of specifications<Taiwan Ex(TS) Specifications>
Model

SD-1GH

Detection principle

Semiconductor

Detection gas

Combustible/toxic gas

Concentration display

LED(4digits・7segments)

Detection range

Depend on detection gas

Resolution

Depend on detection gas

Detection method

Diffusion type

Alarm setpoint

Depend on detection gas

Power display

POWER lamp lighting (green)

External output
Alarm accuracy(under an identical condition)

Gas concentration signal/alarm contact (gas alarm or fault alarm, gas/fault common alarm)
Within ±25% to the alarm setpoint value (combustible gas)
Within ±30% to the alarm setpoint value (toxic gas)

Alarm-delay time
(under an identical condition)
Gas alarm type

Within 30 or 60 sec(when introducing 1.6 times thicker gas than alarm setpoint value)

Gas alarm display

ALM lamp lighting (red)Gas alarm pattern

Auto-recover

Fault alarm/self diagnosis

System failure/sensor failure

Fault alarm display

FAULT lamp lighting(yellow)/detail display

Single alarm (H)Fault alarm pattern

Auto-recover

Alarm contact

No-voltage contact 1a, Non-exciting at normal (exciting at alarm) or exciting at normal(non-exciting at alarm)

Contact capacity

250 VAC - 0.5 A/30 VDC - 0.5 A (resistant load)

Transmission scheme

Three-wire analog transmission (in common with power supply <power, signal, common>)Transmission specification

4 - 20 mA DC (linear/load resistance under 300 Ω)Transmission cable

CVVS1.25 mm2 or 2.0mm2
CVVS1.25 mm2 or 2.0mm2

Transmission distance

1.25km or less in case of CVVS 1.25mm2
2.0km or less in case of CVVS 2.0mm2

Functions

Alarm delay/suppression

Power supply

24 VDC±10%- 3-core(when the contact is not used)- 5-core(when the contact is used)

Power consumption

MAX. 3 W

Cabling port

Pressure proof packing gland<G3/4>(Compatible cables φ9.6-13.0mm in outer diameter) or
Adapter A<NPT1/2> or Adapter B<NPT3/4>

Initial clear

Approx. 25 sec

Operating temperature range-20 - +60ºC (non-rapidly-vary)

Operating humidity range

Below 95% RH (non-condensing)

Structure

Wall mounting type

Explosion protected
construction

Flame-proof enclosures

Explosion-proof class

Ex db ⅡC T5 Gb

Dimensions

Approx. 148 (W) x 167 (H) x 88 (D) mm (projection portions excluded)

WeightApprox. 2.0 kg

Outer color

Munsell 7.5BG5/2- 51 -

SD-1GH

11 Definition of Terms

11

Definition of Terms
Semiconductor

This is a principle of the sensor installed in the detector.
See "10-2. Detection principle" for details.

Initial clear

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.

Full scale

Maximum value of the detection range.

%LEL

A unit which the lower explosive limit (LEL) of the combustible gas to be
detected is set to 100.

ppm

A concentration unit that means part per million of the combustible gas to be
detected.

Calibration

Adjusts the readings to the calibration gas concentration value by using thecalibration gas.

Zero suppression

A function to cut off the specific drifting that the sensor has.

Alarm delay time

A function which temporarily suspends activation to prevent a false alarm
caused by noise from its outside.

INHIBITThe gas detection function is temporarily suspended during maintenance, etc.
of the detector.
This is also called "point skip", which has the same function.

- 53 -

SD-1GHManual Log
Rev.

Amendment

Issue data

0First issue

7/14/2017

1

Addition : P15 Eccentric washer, P16 Eccentric washer inner diameter

12/7/2017

2
3

Addition : P14,15,47 torque and grease
Correction : P1 Name plate, P7 Type of Protection and Marking code
P51 Explosion-proof class
Correction : P3 Name plate, P7 Certificate numbers,
Corrected ITRI to Taiwan Ex(TS)1/25/20193/23/2021