PT2E-2897

Smart Transmitter/Gas Detector Head

SD-1D-AS(TYPE GP H)(TYPE NC H)
Operating Manual(PT2E-161)(PT2-161)

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.

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.

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.

<Contents>
1. Outline of the Product ............................................................................................. 2
1-1. Preface ................................................................................................................. 2
1-2. Purpose of use ..................................................................................................... 2
2. Important Notices on Safety .................................................................................... 4
2-1. Danger cases ....................................................................................................... 4
2-2. Warning cases ..................................................................................................... 5
2-3. Precautions .......................................................................................................... 6
2-4. Safety information ................................................................................................ 7
3. Product Components .............................................................................................. 9
3-1. Main unit and standard accessories .................................................................... 9
3-2. Names and functions for each part ...................................................................... 11
3-3. Block diagram ...................................................................................................... 13
4. How to Use .............................................................................................................. 15
4-1. Before using the detector ..................................................................................... 15
4-2. Precautions for installation sites .......................................................................... 15
4-3. Precautions for system designing ........................................................................ 16
4-4. How to install ........................................................................................................ 18
4-5. Installation procedure ........................................................................................... 19
4-6. How to wire .......................................................................................................... 21
4-7. How to Tube ......................................................................................................... 25
5. How to Operate ....................................................................................................... 26
5-1. Preparation for start-up ........................................................................................ 26
5-2. Basic operating procedures ................................................................................. 27
5-3. How to start the detector ...................................................................................... 28
5-4. Modes .................................................................................................................. 29
5-5. Maintenance mode (User) ................................................................................... 30
5-6. Flow Rate Adjustment .......................................................................................... 33
5-7. How to exit ........................................................................................................... 33
6. Operations and Functions ....................................................................................... 34
6-1. Gas alarm activation ............................................................................................ 34
6-2. Fault alarm activation ........................................................................................... 35
6-3. External output operation ..................................................................................... 36
6-4. Other functions ..................................................................................................... 37
7. Maintenance ............................................................................................................ 38
7-1. Maintenance intervals and items ......................................................................... 38
7-2. Maintenance mode (Regular maintenance)......................................................... 40
7-3. Calibration method ............................................................................................... 49
7-4. Replacement parts ............................................................................................... 52
8. Storage, Relocation and Disposal ........................................................................... 54
8-1. Procedures to store the detector or leave it for a long time ................................. 54
8-2. Procedures to relocate the detector or use it again ............................................. 54
8-3. Disposal of products ............................................................................................ 54
9. Troubleshooting ....................................................................................................... 55
10. Product Specifications ........................................................................................... 57
10-1. List of specifications ........................................................................................... 57
10-2. Detection principle ............................................................................................. 64
11. Definition of Terms ................................................................................................. 65-1-

1 Outline of the Product1-1. Preface

1

Outline of the Product1-1. Preface
Thank you for choosing our smart transmitter/gas detector head SD-1D-AS(TYPE GP H)(TYPE NC H).
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.
The detector has two types of TYPE GP H and TYPE NC H. In this manual, instructions of TYPE GP H
(such as an example of LED display) are described as example.
Product specifications may be abbreviated in this document as follows.
Japan Ex specification ： Japan specification
ATEX / IECEx specification ： Export specification

1-2. Purpose of use







The detector is a fixed type gas detector head that detects leak of combustible gases and that performs
the alarm activation when the gas concentration is over the setting value.
This detector is a safety unit, not an analyzer or densitometer which performs quantitative/qualitative
analysis/measurement for gases. Please fully understand the features of the detector before using it,so that 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 draws a gas by an aspirator using compressed air to perform gas detection.
The detector outputs gas concentration in 4 – 20 mA.
The detector has HART communication function.

-2-

1 Outline of the Product1-2. Purpose of use

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

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.

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

Japan Ex certificate

CE marking

ATEX/IECEx, CE marking type name plate

Japan Ex type name plate-3-

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:
Export Specification: -20 to +60°C
Japan Specification: -20 to +53°C

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.

-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.
Tube
The detector is designed to draw gases around it under the atmospheric pressure. Be sure that
excessive pressure is not applied to the sampling inlet and outlet (GAS IN, GAS OUT) of thedetector. Detected gases must be exhausted from the detected gas exhausting outlet (GAS OUT) to
which an exhaust tube is connected, to a point regarded as a safe place.
Zero adjustment in the atmosphere
When the zero adjustment is performed in the atmosphere, check the atmosphere for freshness
before beginning the adjustment. If interference 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-

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 etc. near the detector or its cables may disturb indication reading. If atransceiver or other radio wave transmitting device 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 in less than five seconds may cause errors.
Verify that the flow rate corresponds to the specified flow rate before using the detector.
If it does not correspond to the specified flow rate, gas detection cannot be performed properly.
Check whether the flow rate is unstable or lost.
Attach the dust filter before using the detector.
Before using the detector, attach the specified filter to prevent disturbances by possible gas
adsorption or air dust.
A dust filter to be used varies depending on the gas to be detected. For more information on dust
filters, please contact RIKEN KEIKI.
Observe the operating restrictions to prevent condensation inside the tube.
Condensation formed inside the tube causes clogging or gas adsorption, which may disturb
accurate gas detection. Thus, condensation must be avoided. In addition to the installation
environment, carefully monitor the temperature/humidity of the sampling point to prevent
condensation inside the tube. In particular, when detecting a gas which is dissolved into water andcorrodes contacted materials, such as a strong acid gas, the gas is undetectable and furthermore
may corrode internal parts. Please observe the operating restrictions.
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.
Never fail 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.

-6-

2 Important Notices on Safety

2-4. Safety information

2-4. Safety information
Necessary information for explosion proof construction of Model SD-1D
The Model SD-1D 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.
<ATEX/IECEx Specification>
Technical Data
(Protection Method)(Certificate Numbers)(Group)(Category)(Type of Protection and Marking code)(Equipment Protection Level)(Ambient Temperature)(Electrical Data)(Applicable Standard)(Manual Number)

Flameproof enclosure “d”
IECEx KEM 10.0036X
KEMA 10ATEX0083 X
II
2G
Ex db IIC T5
Gb-20C to +60C
Supply voltage: 24 V dc (Typ.)
Output signal: 4 to 20 mA
IEC 60079-0: 2017，IEC 60079-1: 2014-06
EN IEC 60079-0: 2018，EN 60079-1: 2014
PT2E-161

Installation

Installation Diagram
Hazardous Location(Zone 1)←→

Nonhazardous Location
Indicator

Gas Detector(SD ‐ 1D)＋－
SignalCVVS Cable

-7-

＋
－
Signal2 Important Notices on Safety

2-4. Safety information<Japan Ex Specification>
Technical Data
(Protection Method)

Flameproof enclosure(Explosion-proof class)

Ex d IIC T5 X

(Ambient Temperature)-20C to 53C

(Electrical Data)

Supply voltage: DC24V 125mA
Analog signal output: DC24V 25mA

(Applicable Standard)

JNIOSH-TR-NO. 43(2008)

Installation

Installation Diagram
Hazardous Location(Zone 1)←→

Nonhazardous Location
Indicator

Gas Detector(SD ‐ 1D)＋－
SignalCVVS Cable

-8-

＋
－
Signal3 Product Components

3-1. Main unit and standard accessories

3

Product Components

3-1. Main unit and standard accessories<Main Unit> (including a cable gland or an adapter)【Export Specification】【Japan Specification】-9-

3 Product Components

3-1. Main unit and standard accessories<Standard Accessories>
Operating manual ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ one
Dedicated handling lever ꞏꞏꞏꞏ one
Dedicated control key ꞏꞏꞏꞏꞏꞏꞏꞏ 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
Three
Over 51 units
Four
MC filter with flow monitor ꞏꞏꞏ one

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

NOTE
This product is designed to have a gas detector head "SD-1D" incorporated in the sampling device. Theinternal tubing required for "SD-1D" has been arranged prior to shipment.

- 10 -

3 Product Components

3-2. Names and functions for each part3-2. Names and functions for each part
(4) Compact regulator

Display(1) Gas detector head(2) External cable inlet(6) Gas inlet(5) Adjustingknob(3) Needle valve(7) Gas/air outlet(8) Compressed air inlet

No.

Name

Function(1)

Gas detector head

Detects a gas (applicable detector head: SD-1D).

(2)

External cable inlet

A port to draw a power and signal cables for the gas detector head.

(3)

Needle valve(4)Compact regulator(5)

Adjusting knob

Adjusts the amount of compressed air after reducing pressure.
Reduces the pressure of supplied compressed air and displays apressure value after the reduction.
A knob turned to reduce the pressure of supplied compressed air.

(6)

Gas inlet

An inlet for gases.

(7)

Gas/air outlet

An outlet for gases and compressed air.

(8)Compressed air inlet

An inlet for compressed air.

- 11 -

3 Product Components

3-2. 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.

- 12 -

3 Product Components

3-3. Block diagram

3-3. Block diagram<Electric Diagram>

Power supply part

Display（POWER）（ALARM）（FAULT)POWER INPUT (24 VDC)
Seven-segment LED(four-digit)

Transmission part

Controller(CPU)

Magnetic operation part
(MENU/ESC) (▲) (▼) (SET) 4 – 20 mA transmission
 HART communication

Sensor- 13 -

3 Product Components

3-3. Block diagram<Tubing Diagram>Compact
regulator(3)
MC filter withflow monitor

Measuringgas inlet

Needle valve(1)
Aspirator(2)(4)
Gas/air outlet

Bs (Brass) specification* The customer is required to provide the followings.
(Alternate long and two short dashed line)* Internal tubing has been arranged already.
(Dashed line)

Copper or stainless tube (ø6 - ø8): X
Copper or stainless tube (ø4 - ø6): Y
Flexible tube: (1)Flexible tube: (2)Copper tube (ø4 - ø6): (3)Copper tube (ø6 - ø8): (4)(Alternate long and short dashed line)(Solid line)
SUS (Stainless) specification* The customer is required to provide the followings.
(Alternate long and two short dashed line)* Internal tubing has been arranged already.
(Dashed line)

Stainless tube (ø6 - ø8): X
Stainless tube (ø4 - ø6): Y
Flexible tube: (1)Flexible tube: (2)Copper tube (ø4 - ø6): (3)Copper tube (ø6 - ø8): (4)(Alternate long and short dashed line)(Solid line)- 14 -

Compressed
air inlet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 sites
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.
<Export Specification> -20 to +60ºC<Japan Specification> -20 to +53ºC- 15 -

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 devices exist.
Do not install the detector in a place where maintenance of the detector cannot be performed or wherehandling the detector involves dangers.
Regular maintenance of the detector must be performed.
Do not install the detector in a place where the machinery must be stopped when maintenance is performed
in its inside, where parts of the machinery must be removed to perform maintenance, or where the detector
cannot be removed because tubes or racks prevent access to it. Do not install the detector in a place where
maintenance involves dangers, for example, near a high-voltage cable.
Do not install the detector in machinery which is not properly grounded.
Before installing the detector in machinery, the machinery must be grounded properly.
Do not install the detector in a place where interference gases exist around it.
The detector must not be installed in a place where interference 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 while the system is being stabilized. In such cases, use a UPS (uninterruptible powersystem), or take appropriate actions on the receiving side.
The detector must be provided with the following power supply.
Power supply voltage
Allowed time of
momentary blackout
Others24 VDC±10%: Terminal voltage of the detector
Up to 10 milliseconds(To recover from the momentary
blackout for 10 milliseconds or more,restart the detector.)
Do not use it with a power supply oflarge power load or high-frequency
noise.

- 16 -

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

4 How to Use

4-3. Precautions for system designing

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

Grounding*

Take appropriate measures in accordance with the importance of the facilities andthe 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.)
In addition to lightning, there are more sources of surge noise. To protect units
from these noise sources, the units must be grounded.

The lightning arrester has a circuit to remove a surge voltage which damages field devices, so thatsignals may be attenuated. Before installing a lightning arrester, verify that it works properly.

- 17 -

4 How to Use

4-4. How to install

4-4. How to install<Installation Dimensions and Maintenance Space>
1000

150

100

100

100
Unit: mm

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,or where the detector cannot be removed because tubes or racks prevent access to it. Do notinstall the detector in a place where maintenance involves dangers, for example, near ahigh-voltage cable.
 If the detector is to be fixed on a wall or the like, install it properly where can hold its weight.

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- 18 -

4 How to Use

4-5. Installation procedure

4-5. Installation procedure<Attaching External Cable>【Export Specification】
The export specification comes with adapter A (NPT 1/2) asstandard. Please prepare the Ex cable gland that is suitable for the adapter.
Adapter(NPT1/2)【Japan Specification】
Cable gland, Rubber seal, Washer and Eccentric washer are mounted on SD-1D main body as shown
below.
Attach the parts :Pass a Cable (e.g. CVVS) through the Cable gland, Eccentric washer, Washer, and Rubber seal, anddrawn into detector inside. (For wire methods, see "4-6 How to wire".) When installing the cable gland, wipe
the cable gland mounting part, the hexagon socket set screw, the grounding screw, and the cable gland andwipe the specified grease.
Tightens Cable gland, and then tightens hexagon socket set screw (M4×6), and fix cable gland.

Grounding screw
Hexagon socket set screw（M4×6）
Cable gland mounting part
Rubber seal

Main unit case

WasherRubber seal

Daub screw with grease
Cable gland(G3/4)

WasherEccentric washer
Cable（CVVS etc.）

Eccentric

Cable gland(G3/4)

Please mind directionof Eccentric washer

Cable gland section view
Washer side

Cable gland side

- 19 -

4 How to Use

4-5. Installation procedure

WARNING 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 is changed,
lost etc.

CAUTION Tighten 40 Nꞏm or larger torque value to ensure the tightening cable gland and seal plug.
 Tighten the hexagon socket head cap screws fixing the cable gland with a tightening torque of
107.8±12.7N･m.

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- 20 -

4 How to Use

4-6. How to wire

4-6. How to wire








CAUTIONBe 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 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>
CVVS 1.25mm2 or 2.0mm2/3-core
CVVS 1.25mm2 or 2.0mm2/4-core

3-wire4-wire<Parts. length table of outside conductor lead-in>
Cable overall outer
diameter(mm)Rubber seal innerdiameter(mm)Washer innerdiameter(mm)Clamp innerdiameter(mm)From Φ9.6 to less than Φ10.5

Φ11

Φ12

Φ10.8

From Φ10.5 to less than Φ11.5

Φ12

Φ12

Φ11.8

From Φ11.5 to less than Φ12.5

Φ13

Φ14

Φ12.8

From Φ12.5 to less than Φ13.0

Φ13.5

Φ14

Φ13.8

φ23

- 21 -

4 How to Use

4-6. How to wire

NOTE

 The following table shows an example of overall outer diameters of cables. Use them for reference.
The overall outer diameters must be checked because they somewhat vary between manufacturers.
Number of core

CVV 1.25mm2

CVV 2mm2

CVVS 1.25mm2

CVVS 2mm2

2

Φ9.5

Φ10.5

Φ10.0

Φ11.0

3

Φ10.0

Φ11.0

Φ10.5

Φ11.5

4

Φ10.5

Φ11.5

Φ11.0

Φ12.0

5

Φ11.5

Φ12.5

Φ12.0

Φ13.0

6

Φ12.5

Φ13.5

Φ13.0

Φ14.0

When the four hexagon socket head bolts of the gas detector head "SD-1D" are loosened and the lid isopened, the following terminal plate appears. Grounding terminals
other one outside.

are provided: one inside and the<Figure of Terminal Plate>
DC+

１

DC-

２

Sig+

３

Sig-

４

DC24V

4-20mA+
HART

Grounding terminalNOTE
If HART functions are not used, 2p of terminal
plate is being deemed to be power and the
4-20mA output common (-) terminal, andusing as 3-wire is possible.

<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

Cable: 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)- 22 -

4 How to Use

4-6. How to wire

CAUTION
The specified bare wire length must be observed when the wire insulation is peeled off.
Improper clamping of the wire due to a shorter bare wire length may cause defective electric
conduction or heating.
Catching the wire insulation due to a shorter bare wire length may cause defective electric
conduction 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.
8 - 9 mm

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 thewarranty of the 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 principle, 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 electric conduction or heating.
When the wire is inserted under the spring by mistake, it does not contact the conductive part. Thismay cause defective electric conduction or heating.

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

While holding down the lever, insert the wire
into the (round) wiring hole until it reaches thedeepest 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.)- 23 -

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, never fail to connect it to the 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
wire with cross-sectional area of 4 mm2 or more for the external grounding terminal.

<Wiring Example>
Connecting to the indicator

SD-1D
1 2 3 4

RM-5003, etc.

+24V
GND
Sig

Connecting to the upper unit (DCS, PLC)

SD-1D
1 2 3 4

Power supply(24 VDC)

Relay
terminal+-

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.
- 24 -

4 How to Use

4-7. How to Tube

4-7. How to TubeAs standard, either "Bs" or "SUS" union is attached to the sampling inlet/outlet (gas inlet, gas/air outlet,
compressed air inlet) of the detector according to the specification.
The compatible tubes are tubes of ø6 (OD) - ø4 (ID) and ø8 (OD) - ø6 (ID). The tube must be installed with
the inners and sleeves attached to prevent a leak. * See "3-3. Block diagram <Tubing Diagram>".
When the tube is cut, its cut point has a smaller inner diameter. Use a file etc. to expand the inner diameterof the cut point. To remove cut-dust remaining inside of the tube, blow compressed air into the tube before
connecting it to the detector.
Some sample gases have highly adsorptive or corrosive property. Select the tube material taking into
account of these precautions.
Be careful that the flow rate introduced to the detector is in the range of 0.8 - 2 L/min (the maximum
pressure inside the flow path and sensor parts is 10.13 kPa <gauge pressure>).












WARNING
The detector is designed to draw gases around it under the atmospheric pressure.
Be sure that excessive pressure is not applied to the sampling inlet and outlet (gas inlet, gas/air
outlet) of the detector.
Detected gases must be exhausted from the gas/air outlet to which an exhaust tube isconnected, to a point regarded as a safe place.

CAUTION
The longer the tube of the gas inlet is, the longer it takes for a gas to reach the detector.
Because some gases have a highly adsorptive property for the tube, resulting in a slow
response and a lower reading than the actual value, the length of the gas inlet tube must be
minimized.
When the humidity in the sampling point is high, condensation may be formed inside of the
tube. Make sure to avoid condensation when using a gas which is dissolved into water andcorrodes contacted materials, such as a strong acid gas, because it may disable the detector
for detecting gas and furthermore may corrode internal parts. Also avoid an excessive
U-shaped or V-shaped tube piping.
Determine the inlet for the sample gas, considering the airflow of the sample gas line and thegas generating process.
To remove dust, never fail to attach a dust filter in the middle of the tube.
It is needed to decide the length and material of the tube. Please contact RIKEN KEIKI for more
information.

- 25 -

5 How to Operate

5-1. Preparation for start-up

5

How to Operate
5-1. Preparation for start-up
Before connecting a power supply, read and understand the following precautions. Ignoring theseprecautions 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.

Check that there is no clogging or leak in the connected tube. (If the connected tube is clogged,pressure is applied to the sensor, causing errors and malfunctions.)Check that the filter is attached properly. (The filter is specified based on the gas to be detected.)- 26 -

5 How to Operate

5-2. Basic operating procedures

5-2. Basic operating procedures
Normally, the detection mode is used for normal operations. (The detection mode is activated after the
power is turned on.)Lamp onLamp offLamp
blinking<Detection Mode>

The detector isrestarted after
recovering from fault.

MENU/ESC(long pressing)

MENU/ESC(long pressing)<User Mode><Gas Alarm><Fault Status><Maintenance Mode>WARNING
When the detector enters other mode from the detection mode while an alarm is activated, thealarm is reset.

- 27 -

5 How to Operate

5-3. How to start the detector

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 thedetector is started.
After the warm-up is completed, perform a 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 mode

Power On

Initial Clear

Detection Mode

- 28 -

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)

Maintenance Mode(regularmaintenance)

LED 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 Not used.
2-4.8 Not used.
2-4.9 Zero Follower Selection
2-4.A Maintenance Mode External Output Setting
2-4.B External Output Setting
2-4.C Alarm Test External Output Setting
2-4.D Sensor Operation Start Setting
2-4.E Password Setting
2-4.F Sensor Fault Alarm Pattern Setting

Display

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.

- 29 -

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 detectionmode.
(If the detector remains in the user mode, it automatically returns to the detection mode in ten
hours.)

LED

Detection Mode
Press the MENU/ESC key
for three seconds.

User Mode
1-0. ROM/SUM Display
Show the program version
and others. This is not
typically used by the user.

1-1. Zero Adjustment
Perform the zeroadjustment.

Zero Adjustment => P31

1-2. Various Setting Display
Show various setting values.

Setting Display => P32

1-3. Mode Switching
Switch to the maintenancemode.

See "Regular
maintenance mode".

To 1-0- 30 -

5 How to Operate

5-5. Maintenance mode (User)<Zero Adjustment "1-1">This is used to perform the zero adjustment.
LED

1-1
Press SET key.

Current Concentration Value Display
Press the 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 1-1 after
PASS is displayed.

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

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.

- 31 -

5 How to Operate

5-5. Maintenance mode (User)<Setting Display "1-2">
Show various setting values.
LED

1-2.
Press SET key.

Alarm Setpoint Display

Alarm Delay Time Display(seconds)

Zero Suppression Value
Display

To 1-2- 32 -

5 How to Operate

5-6. Flow Rate Adjustment

5-6. Flow Rate Adjustment
Set the flow rate according to the following steps.
(1) Check that the supply side of compressed air is closed.
(2) After making sure that the lock ring of the compact regulator
adjusting knob is located at the front side (if it is at the far side, theknob will not turn), turn the adjusting knob to the LOW side(counterclockwise) until it stops. (Figure 1)(3) Turn the needle valve clockwise until it stops, and then turn it
counterclockwise by two turns. (Figure 2)(4) Open the supply side of compressed air.
(5) Turn the compact regulator adjusting knob slowly to the HIGH side
(clockwise) until the float of the MC filter with flow monitor makes
contact with the upper stopper and stops, and then move the lockring to the far side to lock the adjusting knob.
(6) Slowly turn the needle valve clockwise until the float of the MC filter
with flow monitor makes contact with the upper stopper and moves
up and down by one to two millimeters. (Figure 3)
The flow rate setting is now completed.
*

If the float of the MC filter with flow monitor comes in and out of sightduring operation, turn the needle counterclockwise until the float
makes contact with the upper stopper and moves up and down by
one to two millimeters and adjust the flow rate.
If the above does not help the float to behave normally, it may
indicate clogging in the gas inlet or MC filter, or other problems. In
this case, perform maintenance.

Regulator

Lock ring
Adjusting knob
Figure 1
NeedleFigure 2

Float

Figure 35-7. How to exit
Turn off the detector according to the followings.

Stop supplying compressed air to the detector.
Turn the needle valve clockwise until it stops.
Move the adjusting knob lock ring to the front side and turn the knob to the LOW side(counterclockwise) until it stops.
Turn off the power supply (24 VDC) to the detector.



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

- 33 -

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.

<Alarm Activation>
It lights up when the gas concentration reaches or exceeds the alarm setpoint value. (only when the alarm isused)
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)- 34 -

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.
 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".

- 35 -

6 Operations and Functions

6-3. External output operation

6-3. External output operation
Signal Transmission System
Transmission Path
Transmission DistanceElectric current transmission (non-isolated) 4 – 20 mA
CVVS
CVVS 1.25 mm2: Maximum 1.25 km
CVVS 2.0 mm2: Maximum 2.0 km
Below 300 Ω
4 - 20 mA(output value)
0 mA
Depending on the setting of the section 9
2.5 mA setting: 2.5 mA
4 mA, HOLD, 4 - 20 mA setting: 4 mA
4 - 20 mA (concentration output)
4 - 20 mA (concentration output)
Less than 22mA:lenear output (concentration output)
Exceed 22mA:22mA(Fixed)
0.5 mA (Fixed)
Depending on the setting of the section 9
2.5 mA setting: 2.5 mA
4 mA, HOLD, 4 - 20 mA setting: 4 mA
Output ON setting: 4 - 20 mA (concentration output)
Output OFF setting: 4 mA
2.5 mA setting: 2.5 mA
4 mA setting: 4 mA
HOLD setting: The previous value retained
4-20 mA setting: 4 - 20 mA (concentration output)

Connection Load ResistanceModePower Off1
2
Initial Clear

3
4
5
6
7

Detection Mode(No alarm)
Detection Mode(Gas alarm)
Detection Mode
(Full scale over)Fault Alarm
INHIBIT

8

Alarm Test

9

Maintenance Mode(User)
Maintenance Mode(Regular
Maintenance)

Example of Gas Concentration and External Output
4 - 20 mA specification(Maintenance output: 2.5 mA setting)External output
22 mA
20 mA

Detection Mode
Maintenance Mode

4 mA
2.5 mA
Zero
suppression

Gas concentration0

Full scale

CAUTION The 4 - 20 mA output is already adjusted. In case of over scale, an output will not exceed 22 mA.
 Output during INHIBIT or initial clear is based on 4 - 20 mA output setting in the maintenancemode.
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 thatthe signal receiver side can prepare to avoid false alarms.

- 36 -

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 TYPE GP H: 2% FS and TYPE
NC H: 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.

- 37 -

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 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

Flow rate check

Maintenance content
Check that the power lamp lights up.
Check that the concentration display value is zero.
When the reading is incorrect, perform the zeroadjustment after ensuring that no interference gases
exist around it.
Check the flow rate to find abnormalities.

Filter check

Check the dust filter for dust or clogging.

Alarm test

Inspect the alarm circuit by using the alarm test
function.
Perform the span adjustment by using the calibration
gas.
Check the gas alarm by using the calibration gas.

Span adjustment
Gas alarm check- 38 -

Daily
maintenance

Monthly
maintenanceRegularmaintenance

○

○

○

○

○

○

○

○

○

○

○

○

－

○

○

－

－

○

－

－

○

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 ourmaintenance service.
The following are typical maintenance services. For more information, please contact RIKEN KEIKI.
Main Services
Power supply check:

Concentration display check:

Flow rate check:

Filter check:

Alarm test:

Span adjustment
Gas alarm check::

Cleaning and repair of:device(Visual diagnosis)
Device operation check:
Replacement of consumable :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 theoperation with the UPS.)
Verifies that the concentration display value is zero by using the zerogas.
Performs the zero adjustment (fresh air adjustment) if the reading isincorrect.
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.
Checks the dust filter for dust or clogging.
Replaces a dirty or clogged dust filter.
Inspects the alarm circuit by using the alarm test function.
 Checks the alarm lamps. (Checks each activation of ALM1 and
ALM2.)
 Checks the external alarm. (Checks the activation of the external
alarm, such as a buzzer.)
Performs the span adjustment by using the calibration gas.
Checks the gas alarm by using the calibration gas.
 Checks the alarm. (Checks triggering of alarm 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.)
Checks dust or damage on surface, cover or internal parts of thedetector, cleans and repairs 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.

- 39 -

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 detectionmode.
(If the detector remains in the regular maintenance mode, it automatically returns to the detection
mode in ten hours.)

Mode

MaintenanceMode(regularmaintenance)LED
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 Not used.
2-4.8 Not used.
2-4.9 Zero Follower Selection
2-4.A Maintenance Mode External Output Setting
2-4.B External Output Setting
2-4.C Alarm Test External Output Setting
2-4.D Sensor Operation Start Setting
2-4.E Password Setting
2-4.F Sensor Fault Alarm Pattern Setting

Display

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- 40 -

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

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

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

Test Mode=> P432-1. Zero Adjustment
Perform the zero adjustment.

Zero Adjustment=> P502-2. Span Adjustment
Perform the span adjustment.

Span Adjustment=> P51

2-3. Zero/Span Initialization
Initialize the zero/span
adjustment after the sensor is
replaced.
Environmental
Setting=> P482-4. Environmental Setting
Set various operations andfunctions.
2-4.0 and 2-4.3 to 2-4.F arefactory-set. They are nottypically used by the user.

- 41 -

7 Maintenance7-2. Maintenance mode (Regular maintenance)

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

- 42 -

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

2-0.0 Gas Test

Gas Test=> P442-0.1 Alarm Test

Alarm Test=>P45

2-0.2 Fault Test

Fault Test=> P462-0.3 LED Test

LED Test=> P462-0.4 Memory Test

Memory Test=> P47

To 2-0.0

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

- 43 -

7 Maintenance7-2. Maintenance mode (Regular maintenance)<Gas Test "2-0.0">
LED
2-0.0
Press SET key.

Introduce the test gas and perform thegas test.

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

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

- 44 -

7 Maintenance7-2. Maintenance mode (Regular maintenance)<Alarm Test "2-0.1">
LED
2-0.1
Press SET key.

Perform the gas alarm test byincreasing or decreasing the readingwith the ▲ or ▼ key.
Press the MENU/ESC key to cancel
the test and to go back to the originalstate.

To 2-0.1

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

- 45 -

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 the SET key totrigger the fault alarm.
Return to OFF and press the SET key
to cancel the test.
(Pressing the MENU/ESC key alsoenables to cancel the test and to go
back to the original state.)

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

<LED Test "2-0.3">
LED
2-0.3
Press SET key.

LED Test ON/OFF
Select either ON/OFF.
Switch ON and press the SET key toturn on the LEDs (POWER, ALM,
FAULT) and to display the gas
concentration of 8.8.8.8.
Return to OFF and press the SET key
to cancel the test.
(Pressing the MENU/ESC key alsoenables to cancel the test and to go
back to the original state.)- 46 -

7 Maintenance7-2. Maintenance mode (Regular maintenance)<Memory Test "2-0.4">
LED
2-0.4
Press SET key.

When StA. is displayed, press the SET
key again.

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

When memory is correct as a result of
the diagnosis, PASS is displayed.
Press the 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.

- 47 -

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
They are factory-set and not
typically used by the user.

2-4.1 INHIBIT Setting
Set Inhibit.
Select either ON/OFF, andthen press the SET key toconfirm the selection.
When ON is selected, in thedetection mode InHI. and 0.0(gas concentration value) aredisplayed on the LED
alternately. As a result, an
alarm is not triggered toexternal device.
Alarm Setpoint Setting=> P482-4.2 Alarm Setpoint Setting
Set the alarm setpoint.

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

F
To 2-4.0<Alarm Setpoint Setting "2-4.2">
LED
2-4.2
Press SET key.

Alarm Setpoint Setting
Select the number by pressing
the ▲ or ▼ key, and thenpress the SET key to confirm
the value. (Press the
MENU/ESC key to go back to
the original state.)

Return to 2-4.2.

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

- 48 -

7 Maintenance7-3. Calibration method

7-3. Calibration method
Perform a calibration in each mode (zero adjustment mode and span adjustment mode) using thecalibration gas.

Zero adjustment gasCalibration gas (collected in a gas sampling bag)
Gas sampling bag for exhaust gas<Device Connection Example>
Compact regulator

MC filter withflow monitor

Needle valve

Measuringgas inlet

Aspirator

Gas/air outlet

Gas sampling
bag forcalibration gas* Remove glass and filter
parts
Gas
sampling
bag for exhaust
gas

xxx

- 49 -

Compressed
air inlet

Compressedair

7 Maintenance7-3. 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 the 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.

- 50 -

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

CAUTION Before starting the span adjustment, provide the detector with the span adjustment gas and wait
until the indicator is stabilized.
LED

2-2
Press SET key.

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

25.0

Span Adjustment
When the reading blinks, adjust to theintroduced gas concentration by pressing
the ▲ or ▼ key.
After adjusting the value, press the 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.

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 recalibration, thegas sensor life might have expired. After turning off the power supply, please contact RIKEN KEIKI.

- 51 -

7 Maintenance7-4. Replacement parts

7-4. Replacement parts<Sensor Replacement>Gas sensor replacement is according to the following procedures.
(1) Turn off the power supply (24V) to the detector.
(2) After loosened hexagon socket set screw (2 places) by hex wrench (nominal size 2), remove and turning
aspirator cap.
(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.

- 52 -

7 Maintenance7-4. Replacement parts

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

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.

<Replacement of Regular Replacement Parts>
List of recommended regular replacement parts
No.

Name

1
2

Guard assembly
Aspirator cap

Maintenanceintervals
6 months
6 months

Replacement
intervals
3 - 8 years
3 - 8 years

Quantity(pieces per unit)
1
1* The operation must be checked after replacement by a qualified service engineer. For the stable operationof the detector and safety, ask a qualified service engineer to take care of replacement of the parts.
Request RIKEN KEIKI for operation check.

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

- 53 -

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 installationsites" 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, never fail to perform a gas
calibration. For information on readjustment including a 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.

- 54 -

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 FAULT

The power cannot
be turned on.

Abnormaloperations

Sensorabnormalities
E-1

Systemabnormalities
E-9

—

—

●

●

Causes
The wiring is notcorrect.
The terminal plate isremoved.
Abnormalities/momentary blackout of
power supply system
Cable abnormalities(open circuit/not
connected/shortcircuit)Disturbances bysudden surge noise,etc.
The sensor is notconnected or
improperly
connected.
Zero drift caused byenvironmental
changes or aging
deterioration is out of
the range of zero
follower.
Faults of the sensor
The rated voltage is
not supplied to thedetector.
Abnormalities ofROM, RAM or
EEPROM inside ofthe detector- 55 -

Actions
Connect the wiring properly.
Connect the terminal plate properly.
Provide the rated voltage.
Take measures such as checking or adding the
UPS, power supply line filter and insulationtransformer.
Check the wiring of detector and related devices
around it.
Turn off and restart the detector.
If such a symptom is observed frequently, takeappropriate measures to eliminate the noise.
Check if the sensor cable is securely fastened to theterminal plate.

Perform zero adjustment. If the symptom persists
after the zero adjustment, replace the sensor with a
new one.
Replace the sensor with a new one.
Check the power supply, and supply the rated
voltage.
Please contact RIKEN KEIKI.

9 Troubleshooting<Abnormalities of Readings>
Symptoms
CausesDrifting of sensor
output

The reading rises(drops) and it remains
so.

Presence ofinterference gas

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

Span adjustment
impossible

Perform zero adjustment.
Disturbances by interference gases, such as solvents,
cannot be eliminated completely.
For information on actions, such as removal filter, pleasecontact RIKEN KEIKI.
A very small amount of the gas to be detected may beleaking (slow leak). Because ignoring it may cause
dangers, take a remedial measure, i.e., taking actions thesame as those for the gas alarm.

Environmental
changes

Perform the zero adjustment (AIR adjustment).

Presence ofinterference gas

Disturbances by interference gases, such as solvents,
cannot be eliminated completely. For information on
actions, such as removal filter, please contact RIKEN
KEIKI.

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

Sudden change inthe environment

Slow response

Actions

Clogged dust filter
Bended, clogged, or
leaked suction tube
or exhaust tube
Condensation isformed inside thesuction tube.
Deteriorated sensor
sensitivity
Improper calibration
gas concentration
Deteriorated sensor
sensitivity

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
to eliminate them should be taken by the user.
Replace the dust filter.
Fix the defective parts.
Fix the defective parts.

Replace the sensor with a new one.
Use the proper calibration gas.
Replace the sensor with a new one.

- 56 -

10 Product Specifications

10-1. List of specifications

10

Product Specifications
10-1. List of specifications[SD-1D-AS (TYPE GP H)] <ATEX/IECEx Specification>
Model
SD-1D-AS
Type
TYPE GP H
Detection principle
Catalytic combustion method
Gas to be detected
Combustible gas
Applicable gas
SD-1D (TYPE GP H)
detector head
Concentration display LED(4digits・7segments)
Detection range
0 - 100%LEL
Resolution
0.5%LEL
Detection method
Aspirator suction method
Atmosphere equivalent (Compressed air：0.1 - 0.7MPa・Consumption Max.
Sampling condition
3L/min<Atmospheric conversion>)
Flow rate
0.8 ±0.1L/min
Alarm setpoint
25% LEL [standard]
Power display
POWER lamp lighting(green)
Alarm accuracy (underWithin ±25% to the alarm setpoint value
the same conditions)

Alarm delay time (under
the same conditions)

Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self
diagnosis
Fault alarm display
Fault alarm pattern
Transmission system
Transmission
specifications
Transmission cable
Transmission distancePower supply
Power consumption
Cabling port
Piping port

Within 30sec(when introducing 1.6 times thicker gas than alarm setpointvalue)(without piping delay time)Single alarm(H)ALM lamp lighting(red)Auto-recover
System failure/Sensor failure
FAULT lamp lighting(yellow)/content display
Auto-recoverTwo-wire analog transmission + digital transmission(HART communication) or
Three-wire analog transmission(in common with power supply<power
supply,signal,common>)4 - 20 mA DC (linear/load resistance under 300 Ω)
CVVS 1.25 mm2 - 4-core or 3-core
CVVS 2.0mm2 - 4-core or 3-core
1.25km or less in case of CVVS 1.25mm2
2.0km or less in case of CVVS 2.0mm2
24 VDC±10%MAX.3W
Adapter A<NPT1/2> or adapter B<NPT3/4> or
Pressure proof packing gland <G3/4> (Compatible cables φ9.6 - 13.0mm in outer
diameter)Gas inlet：Rc1/4(with BS half union<for Cu pipe> or SUS half union<for SUS pipe>
for O.Dφ6-1ｔ)- 57 -

10 Product Specifications

Initial clear
Operatingtemperatures
Operating humidities
Structure
Explosion protected
construction
Explosion-proof grade
Dimensions
WeightColor

10-1. List of specifications
Gas outlet：BS union(for Cu pipe) or SUS union(for SUS pipe) for O.Dφ8-1ｔ
Compressed air inlet：BS union(for Cu pipe) for O.Dφ8-1ｔ
Approx. 25 seconds-20 - +60ºC (non-rapidly-vary)
Below 95% RH (non-condensing)
Wall mounting sampling unit(Cu Specification or SUS Specification)
Flame proof structure
Ⅱ2G Ex db ⅡC T5 Gb(ATEX) / Ex db ⅡC T5 Gb(IECEx)
Approx. 400 (W) x 265 (H) x 102 (D) mm
Approx. 5.6kg
Munsell 7.5BG5/2* When a half-union for gas IN side is changed, check also the external filter (IN/OUT diameter) carefully.

- 58 -

10 Product Specifications

10-1. List of specifications[SD-1D-AS (TYPE NC H)] <ATEX/IECEx Specification>
Model
SD-1D-AS
Type
TYPE NC H
Detection principle
New ceramic catalytic method
Gas to be detected
Combustible gas
Applicable gas
SD-1D (TYPE NC H)
detector head
Concentration display LED(4digits・7segments)
Detection range
Depend on detection gas
Resolution
Depend on detection gas
Detection method
Aspirator suction method
Atmosphere equivalent (Compressed air：0.1～0.7MPa・Consumption Max.
Sampling condition
3L/min＜Atmospheric conversion＞)
Flow rate
0.8 ±0.1 L/min
Alarm setpoint
Depend on detection gas
Power display
POWER lamp lighting(green)
Alarm accuracy (underWithin ±25% to the alarm setpoint value
the same conditions)

Alarm delay time (under
the same conditions)

Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self
diagnosis
Fault alarm display
Fault alarm pattern
Transmission system
Transmission
specifications
Transmission cable
Transmission distancePower supply
Power consumption
Cabling port

Piping port
Initial clear
Operatingtemperatures
Operating humidities
Structure
Explosion protected
construction
Explosion-proof grade
Dimensions
WeightColorWithin 30sec(when introducing 1.6 times thicker gas than alarm setpointvalue)(without piping delay time)Single alarm(H)ALM lamp lighting(red)Auto-recover
System failure/Sensor failure
FAULT lamp lighting(yellow)/content display
Auto-recoverTwo-wire analog transmission + digital transmission(HART communication) or
Three-wire analog transmission(in common with power supply<power
supply,signal,common>)4 - 20 mA DC (linear/load resistance under 300 Ω)
CVVS 1.25 mm2 - 4-core or 3-core
CVVS 2.0mm2 - 4-core or 3-core
1.25km or less in case of CVVS 1.25mm2
2.0km or less in case of CVVS 2.0mm2
24 VDC±10%MAX.3W
Adapter A<NPT1/2> or adapter B<NPT3/4> or
Pressure proof packing gland <G3/4> (Compatible cables φ9.6 - 13.0mm in outer
diameter)Gas inlet：Rc1/4(with BS half union<for Cu pipe> or SUS half union<for SUS pipe>
for O.Dφ6-1ｔ)
Gas outlet：BS union(for Cu pipe) or SUS union(for SUS pipe) for O.Dφ8-1ｔ
Compressed air inlet：BS union(for Cu pipe) for O.Dφ8-1ｔ
Approx. 25 seconds-20 - +60ºC (non-rapidly-vary)
Below 95% RH (non-condensing)
Wall mounting sampling unit(Cu Specification or SUS Specification)
Flame proof structure
Ⅱ2G Ex db ⅡC T5 Gb(ATEX) / Ex db ⅡC T5 Gb(IECEx)
Approx. 400 (W) x 265 (H) x 102 (D) mm
Approx. 5.6kg
Munsell 7.5BG5/2* When a half-union for gas IN side is changed, check also the external filter (IN/OUT diameter) carefully.

- 59 -

10 Product Specifications

10-1. List of specifications

Outline Drawings

SD-1D- 60 -

10 Product Specifications

10-1. List of specifications[SD-1D-AS (TYPE GP H)] <Japan Ex Specification>
Model
SD-1D-AS
Type
TYPE GP H
Detection principle
Catalytic combustion
Gas to be detected
Combustible gas
Applicable gas
SD-1D (TYPE GP H)
detector head
Concentration display LED(4digits・7segments)
Detection range
0 - 100%LEL
Resolution
0.5%LEL
Detection method
Aspirator suction method
Atmosphere equivalent (Compressed air：0.1 - 0.7MPa・Consumption Max.
Sampling condition
3L/min<Atmospheric conversion>)
Suction flow
0.8 ±0.1 L/min
Alarm setpoint
25% LEL [standard]
Power display
POWER lamp lighting (green)
Alarm accuracy (underWithin ±25% to the alarm setpoint value
the same conditions)

Alarm delay time (under
the same conditions)

Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self
diagnosis
Fault alarm display
Fault alarm pattern
Transmission system
Transmission
specifications
Transmission cable
Transmission distancePower supply
Power consumption
Cabling port
Piping port

Initial clear
Operatingtemperatures
Operating humidities
Structure
Explosion protected
construction
Explosion-proof class
Dimensions
WeightColorWithin 30sec(when introducing 1.6 times thicker gas than alarm setpointvalue)(without piping delay time)Single alarm(H)ALM lamp lighting(red)Auto-recover
System failure/Sensor failure
FAULT lamp lighting(yellow)/content display
Auto-recoverTwo-wire analog transmission + digital transmission(HART communication) or
Three-wire analog transmission(in common with power supply<power
supply,signal,common>)4 - 20 mA DC (linear/load resistance under 300 Ω)
CVVS 1.25 mm2 - 4-core or 3-core
CVVS 2.0mm2 - 4-core or 3-core
1.25km or less in case of CVVS 1.25mm2
2.0km or less in case of CVVS 2.0mm2
24 VDC±10%MAX.3W
Pressure proof packing gland <G3/4> (Compatible cables φ9.6 - 13.0mm in outer
diameter)Gas inlet：Rc1/4(with BS half union<for Cu pipe> or SUS half union<for SUS pipe>
for O.Dφ6-1ｔ)
Gas outlet：BS union(for Cu pipe) or SUS union(for SUS pipe) for O.Dφ8-1ｔ
Compressed air inlet：BS union(for Cu pipe) for O.Dφ8-1ｔ
Approx. 25 seconds-20 - +53ºC (non-rapidly-vary)
Below 95% RH (Non-condensing)
Wall mounting sampling unit(Cu Specification or SUS Specification)
Flame proof structure
Ex d ⅡC T5 X
Approx. 400 (W) x 265 (H) x 102 (D) mm
Approx. 5.6kg
Munsell 7.5BG5/2* When a half-union for gas IN side is changed, check also the external filter (IN/OUT diameter) carefully.

- 61 -

10 Product Specifications

10-1. List of specifications[SD-1D-AS (TYPE NC H)] <Japan Ex Specification>
Model
SD-1D-AS
Type
TYPE NC H
Detection principle
New ceramic catalytic method
Gas to be detected
Combustible gas
Applicable gas
SD-1D (TYPE NC H)
detector head
Concentration display LED(4digits・7segments)
Detection range
Depend on detection gas
Resolution
Depend on detection gas
Detection method
Aspirator suction method
Atmosphere equivalent (Compressed air：0.1 - 0.7MPa・Consumption Max.
Sampling condition
3L/min<Atmospheric conversion>)
Suction flow
0.8 ±0.1 L/min
Alarm setpoint
Depend on detection gas
Power display
POWER lamp lighting(green)
Alarm accuracy
Within ±25% to the alarm setpoint value(under the same conditions)

Alarm delay time
(under the same conditions)

Gas alarm typeGas alarm display
Gas alarm patternFault alarm/self
diagnosis
Fault alarm display
Fault alarm pattern
Transmission system
Transmission
specifications
Transmission cable
Transmission distancePower supply
Power consumption
Cabling port
Piping port
Initial clear
Operatingtemperatures
Operating humidities
Structure
Explosion protected
construction
Explosion-proof class
Dimensions
WeightColorWithin 30sec(when introducing 1.6 times thicker gas than alarm setpointvalue)(without piping delay time)Single alarm(H)ALM lamp lighting(red)Auto-recover
System failure/Sensor failure
FAULT lamp lighting(yellow)/content display
Auto-recoverTwo-wire analog transmission + digital transmission(HART communication) or
Three-wire analog transmission(in common with power supply<power
supply,signal,common>)4 - 20 mA DC (linear/load resistance under 300 Ω)
CVVS 1.25 mm2 - 4-core or 3-core
CVVS 2.0mm2 - 4-core or 3-core
1.25km or less in case of CVVS 1.25mm2
2.0km or less in case of CVVS 2.0mm2
24 VDC±10%MAX.3W
Pressure proof packing gland <G3/4> (Compatible cables φ9.6 - 13.0mm in outer
diameter)Gas inlet：Rc1/4(with BS half union<for Cu pipe> or SUS half union<for SUS pipe>
for O.Dφ6-1ｔ)
Gas outlet：BS union(for Cu pipe) or SUS union(for SUS pipe) for O.Dφ8-1ｔ
Compressed air inlet：BS union(for Cu pipe) for O.Dφ8-1ｔ
Approx. 25 seconds-20 - +53ºC (non-rapidly-vary)
Below 95% RH (Non-condensing)
Wall mounting sampling unit(Cu Specification or SUS Specification)
Flame proof structure
Ex d ⅡC T5 X
Approx. 400 (W) x 265 (H) x 102 (D) mm
Approx. 5.6kg
Munsell 7.5BG5/2* When a half-union for gas IN side is changed, check also the external filter (IN/OUT diameter) carefully.

- 62 -

10 Product Specifications

10-1. List of specifications

Outline Drawings

Aspirato

SD-1D

Display

Cable gland(G3/4)
Gas sensor

Gas inlet

Gas outlet

Gas inlet

Gas･air outlet
Piping ODφ8

- 63 -

Compressed air inlet
Piping ODφ8

10 Product Specifications

10-2. Detection principle

10-2. Detection principle[Catalytic Combustion Type]
When a combustible gas burns on the surface of a oxidation catalyst, the catalytic combustion type sensor
considers resultant combustion heat as temperature and resistance changes in the platinum wire coil, andmeasures their gas concentrations.
This sensor detects any combustible gases. The detection range is from zero to the lower explosive limit.
When a highly-concentrated gas over the lower explosive limit comes into contact with the sensor, it may
cause a break.
C: Compensating
element

D: Detecting element

Alumina
Oxidation catalyst

Platinum wire coil

0.5~0.7mm
Fixed
resistanceFixedresistance

0.8~1.0mm
Variable resistor for bridge
equilibrium adjustment

Structure diagram

Variable resistor forbridge voltage adjustment

Power supply

SwitchBasic circuit[New Ceramic Type]
When a combustible gas burns on the surface of a highly active new ceramic oxidation catalyst in catalytic
combustion, the new ceramic-type sensor measures resultant temperature changes by measuring theresistance changes in the heat-resistant alloy wire coil.
The sensor consists of two elements: A detecting element having a heat-resistant alloy wire coil with anultrafine particle (new ceramic) oxidation catalyst sintered on it together with a carrier and atemperature-compensating element with a mixture of gas-inert alumina and glass sintered on it.
When a combustible gas comes into contact with the surface of the detecting element with new ceramicoxidation catalyst sintered on it, the gas burns, causing the temperature to rise. In accordance with thistemperature change, there occurs a change in the resistance of a heat-resistant alloy wire coil that
constitutes the element. These resistance values are approximately proportional to gas concentrations.
From the changes in the resistance values, potential differences are obtained using a bridge circuit anddisplayed as gas concentrations on the meter.
D: Detecting element

Alumina

C: Compensating
element

Heat-resistant alloy wire coilHeat-resistant material(ceramic)

New ceramicoxidation catalyst

1.4~1.6mm

1.3~1.8mm

Fixed
resistanceFixedresistance

Variable resistor for bridge
equilibrium adjustment

Structure diagram
Variable resistor forbridge voltage adjustment

SwitchBasic circuit- 64 -

Power supply

11 Definition of Terms

11

Definition of Terms
Catalytic
combustion typeNew ceramic
Initial clear
Full scale%LEL
ppm
Calibration
Zero suppression
Alarm delay time
INHIBIT
HART
communication

This is a principle of the sensor installed in the TYPE GP H.
See "10-2. Detection principle" for details.
This is a principle of the sensor installed in the TYPE NC H.
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 concentration unit that means part per million of the combustible gas to be detected.
Adjusts the readings to the calibration gas concentration value by using the calibrationgas.
A function to cut off the specific drifting that the sensor has.
A function which temporarily suspends activation to prevent a false alarm caused bynoise from its outside.
The gas detection function is temporarily suspended during maintenance etc. of thedetector.
This is also called "point skip", which has the same function.
DC4-20mA signal digitals signalling is superimposed, and is methods that transmit
multiple signals.

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Revision History
Issue

Revision details

Issue date

0First issue

10/4/20191

Declaration of Conformity

12/23/2019

2

Declaration of Conformity

4/1/2020

3

Safety information, Declaration of Conformity

8/1/2020

4

Safety information, Declaration of Conformity

8/21/2020

5

Declaration of Conformity

11/12/2021

6

UKEX added, CE DoC changed, UKCA DoC added

10/12/2023

7

UKEX and UKCA deleted, DoC updated

2/5/2024