PT2E-3564

Gas Detector with Signal Converter
SD-3 Series
Excerpt Manual
for FM Explosion Proof and Performance(PT2E-356) rev.４

NOTE This manual contains excerpts from FM explosion-proof and performance certification related to the SD-3
series.
 This manual is only included with FM Explosion Proof and Performance Certified products.
 When using this product, please also refer to the Technical Manual for SD-3series (PT2E-287).

Contents

Contents
1.

2.

3.

4.

5.
6.

7.

Product Overview ................................................................................................................................................. 4
1-1 Introduction .................................................................................................................................................. 4
1-2 Intended use and features .......................................................................................................................... 4
1-3 Usage zones and conditions ....................................................................................................................... 4
Important Safety Information ................................................................................................................................ 5
2-1 Danger information ...................................................................................................................................... 5
2-2 Warning information .................................................................................................................................... 5
2-3 Caution information ..................................................................................................................................... 5
2-4 Safety information........................................................................................................................................ 6
Product Configuration......................................................................................................................................... 23
3-1 Main unit and accessories......................................................................................................................... 23
3-1-1 Main unit (SD-3) ............................................................................................................................. 23
3-1-2 Main unit (SD-3SC) ........................................................................................................................ 23
3-1-3 Remote sensor head (GD-3) ......................................................................................................... 23
3-1-4 Standard accessories .................................................................................................................... 23
3-1-5 Optional accessories...................................................................................................................... 24
3-2 Part names and functions ......................................................................................................................... 26
3-3 Block diagrams .......................................................................................................................................... 27
Installation ........................................................................................................................................................... 29
4-1 Installation precautions.............................................................................................................................. 29
4-1-1 General installation information ..................................................................................................... 29
4-1-2 Restrictions regarding installation .................................................................................................. 29
4-2 System design precautions ....................................................................................................................... 32
4-3 Providing maintenance space ................................................................................................................... 32
4-4 Main unit installation .................................................................................................................................. 32
4-5 Remote sensor head (GD-3) installation .................................................................................................. 32
4-6 Connecting the grounding terminal ........................................................................................................... 32
4-7 Connecting the power and signal cables .................................................................................................. 32
4-8 Mounting the sensor .................................................................................................................................. 32
4-9 Alarm relay setting (option) ....................................................................................................................... 32
4-10 Mounting the splash guard...................................................................................................................... 32
Usage Instructions .............................................................................................................................................. 33
Alarm Activation .................................................................................................................................................. 34
6-1 Gas alarm activation.................................................................................................................................. 34
6-1-1 Alarm activation.............................................................................................................................. 34
6-1-2 Contact operation (auto reset) ....................................................................................................... 34
6-1-3 Contact operation (self-latching) .................................................................................................... 34
6-1-4 Alarm response .............................................................................................................................. 35
6-2 Fault alarm activation ................................................................................................................................ 35
6-3 Warning operation ..................................................................................................................................... 36
6-4 External output operation .......................................................................................................................... 36
6-5 Functions to ensure correct alarm activation ............................................................................................ 36
6-5-1 Zero suppression function ............................................................................................................. 36
6-5-2 Automatic sensor recognition function .......................................................................................... 36
Maintenance ....................................................................................................................................................... 37
7-1 Maintenance intervals and items .............................................................................................................. 37
7-2 Maintenance mode.................................................................................................................................... 40
7-3 Performing tests (test mode) ..................................................................................................................... 40
7-4 Performing calibration ............................................................................................................................... 41
7-4-1 Calibration preparation................................................................................................................... 41
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Contents

7-4-2 Performing zero calibration ............................................................................................................ 48
7-4-3 Performing span adjustment.......................................................................................................... 48
7-5 Setting environmental settings 1 ............................................................................................................... 48
7-6 Setting environmental settings 3 ............................................................................................................... 48
7-7 Parts replacement ..................................................................................................................................... 49
7-7-1 Sensor replacement ....................................................................................................................... 49
7-7-2 Replacement of periodic replacement parts.................................................................................. 50
8.
Storage, Relocation, and Disposal..................................................................................................................... 51
8-1 Procedures for storage or when not in use for extended periods ............................................................ 51
8-2 Procedures for relocation or reuse............................................................................................................ 53
8-3 Product disposal ........................................................................................................................................ 53
9.
Troubleshooting .................................................................................................................................................. 54
9-1 Product abnormalities................................................................................................................................ 54
9-2 Reading abnormalities............................................................................................................................... 55
10. Product Specifications ........................................................................................................................................ 56
10-1 SD-3 specifications.................................................................................................................................. 56
10-1-1 SD-3 (model without EC barrier) ................................................................................................... 56
10-1-2 SD-3 (model with EC barrier)......................................................................................................... 58
10-1-3 Electrical ratings (SD-3) ................................................................................................................. 58
10-2 SD-3SC + GD-3 specifications ............................................................................................................... 59
10-2-1 SD-3SC + GD-3 (model without EC barrier) ................................................................................. 59
10-2-2 SD-3SC + GD-3 (model with EC barrier) ...................................................................................... 61
10-2-3 Electrical ratings (SD-3SC + GD-3) ............................................................................................... 61
10-3 Detection target gases for individual detection principles ...................................................................... 62
10-3-1 Non-dispersive infrared absorption type (Infrared type)................................................................ 62
10-3-2 New ceramic type .......................................................................................................................... 62
10-3-3 Semiconductor type ....................................................................................................................... 62
10-3-4 Hot-wire semiconductor type ......................................................................................................... 62
10-3-5 Electrochemical type ...................................................................................................................... 63
11. Appendix ............................................................................................................................................................. 64
11-1 Detection principle ................................................................................................................................... 64
11-2 Sensor Specifications .............................................................................................................................. 65
11-2-1 IR sensor specification .................................................................................................................. 65
11-2-2 Combustible gas sensor specification .......................................................................................... 66
11-2-3 EC sensor specification................................................................................................................. 67
11-3 Calibration curve ...................................................................................................................................... 68
11-3-1 IRF sensor ...................................................................................................................................... 68
11-3-2 NCF sensor .................................................................................................................................... 69
11-4 Terminology.............................................................................................................................................. 69
Product warranty ................................................................................................................................................ 70
Sensor warranty ............................................................................................................................................... 70
Revision History.................................................................................................................................................. 71

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1. Product Overview

1-1 Introduction

1

Product Overview
1-1 Introduction
Thank you for purchasing the SD-3 Gas Detector with Signal Converter (“product” hereinafter).
This operating manual describes product operating procedures and specifications. It provides information
essential to correct use of the product.
When measuring combustible gases, follow the instructions provided in EN 60079-29-2.

1-2 Intended use and features
Please refer to the Technical Manual for SD-3series (PT2E-287).

1-3 Usage zones and conditions
Please refer to the Technical Manual for SD-3series (PT2E-287).

CAUTION Poses risk that combustible or explosive gases can be ignited. The product has not been tested inoxygen-enriched atmospheres (>21 %O2).
 Using this product in locations associated with explosion risks: Devices and components may be used inlocations associated with explosion risks under the conditions specified by approval obtained under
explosion prevention ordinances in Japan, Europe, or internationally.

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2. Important Safety Information

2-1 Danger information

2

Important Safety
Information
2-1 Danger information
Please refer to the Technical Manual for SD-3series (PT2E-287).

2-2 Warning information
Please refer to the Technical Manual for SD-3series (PT2E-287).

2-3 Caution information
Please refer to the Technical Manual for SD-3series (PT2E-287).

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2. Important Safety Information

2-4 Safety information

2-4 Safety information<Product overview> The products have an explosion-proof construction.
 Sensors are divided into three different types, depending on the corresponding detection principles. The
detection methods are divided into the diffusion type and suction type. Suction-type sensors should be usedwith a suction cap fitted.
 The product is a fixed, continuous monitoring detector. It can be connected to a gas monitoring control unit,
recorder, or programmable control unit to output the measured gas readings as a 4 - 20 mA signal or HART
signal.
 The following three product output options are available:
・ No alarm relay, no digital communication
・ 3 alarm relays (contact output) (alarm relays operate in conjunction with gas alarms and faults), no
digital signal
・ No alarm relay, digital communication (RS-485 output)<Detection principles and models> The models corresponding to the individual detection principles are as follows. The models are classified bydetection principle and detection method.
Detection principle (Detection method: Diffusion type)

Model

Optical sensor

Non-dispersive infrared absorption type (infrared type)SD-3RI

Solid state sensor

New ceramic type

SD-3NCElectrochemical sensor

Electrochemical type

SD-3EC
SD-3ECS

Detection principle (Detection method: Suction type)

Model

Optical sensor

Non-dispersive infrared absorption type (infrared type)SD-3DRI

Solid state sensor

New ceramic typeSD-3DNC

Electrochemical sensor

Electrochemical typeSD-3DEC
SD-3DECS When the SD-3SC is combined with the remote sensor head (GD-3), it forms the following models:Model
Detection principle (Detection method: Diffusion type)
Optical sensor
Solid state sensor
Electrochemical sensor

Non-dispersive infrared absorption
type (infrared type)New ceramic type
Electrochemical type

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GD-3(Remote sensor head)
GD-3RI
GD-3NCGD-3ECGD-3ECS

SD-3

SD-3SC2. Important Safety Information

2-4 Safety information<Explosion-proof performance data>
The range of ambient temperatures in which explosion-proof performance can be maintained will differ dependingon whether the optional lightning arrester is fitted.
Refer to the following performance data for each model:【US Certification】<Without lightning arrester>
ExplosionModelClass Zone
proof
construction

Explosionproof class

EPL

Ambient temperature*1

SD-3RI
SD-3DRId

Ⅰ

1

AEx db IIC T6/T5

Gb-50 °C ≤ Ta ≤ +60 °C/+70 °C

d

Ⅰ

1

AEx db IIC T5/T4

Gb-50 °C ≤ Ta ≤ +44 °C/+70 °C

d

Ⅰ

1

AEx db IIC T4

Gb-50 °C ≤ Ta ≤ +70 °C

d

Ⅰ

1

AEx db IIC T4

Gb-50 °C ≤ Ta ≤ +70 °C

SD-3SC*2d

Ⅰ

1

AEx db IIC T5/T4

Gb-50 °C ≤ Ta ≤ +44 °C/+70 °C

SD-3SC*3d

Ⅰ

1

AEx db IIC T6/T5

Gb-50 °C ≤ Ta ≤ +60 °C/+70 °C

SD-3SC*4d

Ⅰ

1

AEx db IIC
T6/T5/T4Gb-50 °C ≤ Ta ≤+47 °C/+55 °C/+70 °C

GD-3RI
SD-3NC
SD-3DNC
GD-3NC
SD-3EC
SD-3DEC
GD-3EC
SD-3ECS
SD-3DECS
GD-3ECS*1 Ambient temperature refers to the temperature range in which the explosion-proof performance is maintained. It
does not refer to the temperature range in which product performance is guaranteed. For information on theoperating temperature range, refer to ‘Detection target gases for individual detection principles’.
*2 When combined with GD-3NC*3 When combined with GD-3RI*4 When combined with GD-3EC and GD-3ECS【US Certification】<With lightning arrester>

Model

ExplosionClass Zone
proof
construction

Explosionproof class

EPL

Ambient temperature*1

SD-3RI
SD-3DRId

Ⅰ

1

AEx db IIC T6/T5

Gb-40 °C ≤ Ta ≤ +60 °C/+70 °C

d

Ⅰ

1

AEx db IIC T5/T4

Gb-40 °C ≤ Ta ≤ +44 °C/+70 °C

d

Ⅰ

1

AEx db IIC T4

Gb-40 °C ≤ Ta ≤ +70 °C

GD-3RI
SD-3NC
SD-3DNC
GD-3NC
SD-3EC
SD-3DEC
GD-3EC7 / 71

2. Important Safety Information

2-4 Safety information

SD-3ECS
SD-3DECSd

Ⅰ

1

AEx db IIC T4

Gb-40 °C ≤ Ta ≤ +70 °C

SD-3SC*2d

Ⅰ

1

AEx db IIC T5/T4

Gb-40 °C ≤ Ta ≤ +44 °C/+70 °C

SD-3SC*3d

Ⅰ

1

AEx db IIC T6/T5

Gb-40 °C ≤ Ta ≤ +60 °C/+70 °C

SD-3SC*4d

Ⅰ

1

AEx db IIC
T6/T5/T4Gb-40 °C ≤ Ta ≤+47 °C/+55 °C/+70 °C

GD-3ECS*1 Ambient temperature refers to the temperature range in which the explosion-proof performance is maintained. It
does not refer to the temperature range in which product performance is guaranteed. For information on theoperating temperature range, refer to ‘Detection target gases for individual detection principles’.
*2 When combined with GD-3NC*3 When combined with GD-3RI*4 When combined with GD-3EC and GD-3ECS【Canadian Certification】<Without lightning arrester>
ExplosionModel
proof
construction

Explosionproof class

EPL

Ambient temperature*1dEx db IIC T6/T5

Gb-50 °C ≤ Ta ≤ +60 °C/+70 °Cd

Ex db IIC T5/T4

Gb-50 °C ≤ Ta ≤ +44 °C/+70 °Cd

Ex db IIC T4

Gb-50 °C ≤ Ta ≤ +70 °Cd

Ex db IIC T4

Gb-50 °C ≤ Ta ≤ +70 °C

SD-3SC*2d

Ex db IIC T5/T4

Gb-50 °C ≤ Ta ≤ +44 °C/+70 °C*3d

Ex db IIC T6/T5

Gb-50 °C ≤ Ta ≤ +60 °C/+70 °C

SD-3SC*4d

Ex db IIC T6/T5/T4

Gb-50 °C ≤ Ta ≤+47 °C/+55 °C/+70 °C

SD-3RI
SD-3DRI
GD-3RI
SD-3NC
SD-3DNC
GD-3NC
SD-3EC
SD-3DEC
GD-3EC
SD-3ECS
SD-3DECS
GD-3ECS
SD-3SC*1 Ambient temperature refers to the temperature range in which the explosion-proof performance is maintained. It
does not refer to the temperature range in which product performance is guaranteed. For information on theoperating temperature range, refer to ‘Detection target gases for individual detection principles’.
*2 When combined with GD-3NC*3 When combined with GD-3RI*4 When combined with GD-3EC and GD-3ECS

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2. Important Safety Information

2-4 Safety information【Canadian Certification】<With lightning arrester>
Explosionproof
construction

Explosion-proof class

EPL

Ambient temperature*1dEx db IIC T6/T5

Gb-40 °C ≤ Ta ≤ +60 °C/+70 °Cd

Ex db IIC T5/T4

Gb-40 °C ≤ Ta ≤ +44 °C/+70 °Cd

Ex db IIC T4

Gb-40 °C ≤ Ta ≤ +70 °Cd

Ex db IIC T4

Gb-40 °C ≤ Ta ≤ +70 °C

SD-3SC*2d

Ex db IIC T5/T4

Gb-40 °C ≤ Ta ≤ +44 °C/+70 °C*3d

Ex db IIC T6/T5

Gb-40 °C ≤ Ta ≤ +60 °C/+70 °C

SD-3SC*4d

Ex db IIC T6/T5/T4

Gb-40 °C ≤ Ta ≤+47 °C/+55 °C/+70 °C

Model
SD-3RI
SD-3DRI
GD-3RI
SD-3NC
SD-3DNC
GD-3NC
SD-3EC
SD-3DEC
GD-3EC
SD-3ECS
SD-3DECS
GD-3ECS
SD-3SC*1 Ambient temperature refers to the temperature range in which the explosion-proof performance is maintained. It
does not refer to the temperature range in which product performance is guaranteed. For information on theoperating temperature range, refer to ‘Detection target gases for individual detection principles’.
*2 When combined with GD-3NC*3 When combined with GD-3RI*4 When combined with GD-3EC and GD-3ECS【ATEx / IECEx Certification】
EN/IEC 60079-29-1<Without lightning arrester>
Model

Explosionproof
constructio
n

Group

Category

Explosion-proof
class

EPL

Ambient temperature*1

d

II

2G

Ex db IIC T6/T5

Gb-50 °C ≤ Ta ≤ +60 °C /+70 °C

d

II

2G

Ex db IIC T5/T4

Gb-50 °C ≤ Ta ≤ +44 °C /+70 °C

d

II

2G

Ex db IIC T4

Gb-50 °C ≤ Ta ≤ +70 °C

d

II

2G

Ex db IIC T4

Gb-50 °C ≤ Ta ≤ +70 °C

SD-3RI
SD-3DRI
GD-3RI
SD-3NC
SD-3DNC
GD-3NC
SD-3EC
SD-3DEC
GD-3EC
SD-3ECS
SD-3DECS

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2. Important Safety Information

2-4 Safety information

GD-3ECS
SD-3SC*2

d

II

2G

Ex db IIC T5/T4

Gb-50 °C ≤ Ta ≤ +44 °C/+70 °C

SD-3SC*3

d

II

2G

Ex db IIC T6/T5

Gb-50 °C ≤ Ta ≤ +60 °C/+70 °C

SD-3SC*4

d

II

2G

Ex db IIC
T6/T5/T4Gb-50 °C ≤ Ta ≤+47 °C/+55 °C/+70 °C*1 Ambient temperature refers to the temperature range in which the explosion-proof performance is maintained. It
does not refer to the temperature range in which product performance is guaranteed. For information on theoperating temperature range, refer to ‘Detection target gases for individual detection principles’.
*2 When combined with GD-3NC*3 When combined with GD-3RI*4 When combined with GD-3EC and GD-3ECS【ATEx / IECEx Certification】
EN/IEC 60079-29-1<With lightning arrester>
Explosionproof
construction

Group

Category

Explosion-proof
class

EPL

Ambient temperature*1

d

II

2G

Ex db IIC T6/T5

Gb-40 °C ≤ Ta ≤ +60 °C/+70 °C

d

II

2G

Ex db IIC T5/T4

Gb-40 °C ≤ Ta ≤ +44 °C /+70 °C

d

II

2G

Ex db IIC T4

Gb-40 °C ≤ Ta ≤ +70 °C

d

II

2G

Ex db IIC T4

Gb-40 °C ≤ Ta ≤ +70 °C

SD-3SC*2

d

II

2G

Ex db IIC T5/T4

Gb-40 °C ≤ Ta ≤ +44 °C/+70 °C

SD-3SC*3

d

II

2G

Ex db IIC T6/T5

Gb-40 °C ≤ Ta ≤ +60 °C/+70 °C

SD-3SC*4

d

II

2G

Ex db IIC
T6/T5/T4Gb-40 °C ≤ Ta ≤+47 °C/+55 °C/+70 °C

Model

SD-3RI
SD-3DRI
GD-3RI
SD-3NC
SD-3DNC
GD-3NC
SD-3EC
SD-3DEC
GD-3EC
SD-3ECS
SD-3DECS
GD-3ECS*1 Ambient temperature refers to the temperature range in which the explosion-proof performance is maintained. It
does not refer to the temperature range in which product performance is guaranteed. For information on theoperating temperature range, refer to ‘Detection target gases for individual detection principles’.
*2 When combined with GD-3NC*3 When combined with GD-3RI*4 When combined with GD-3EC and GD-3ECS

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2. Important Safety Information

2-4 Safety information<Electrical data>
Option (select one)
Model

Supply voltage

Powerconsumption

Signal output

No alarm relay/
No digitalcommunication

SD-3RI
SD-3DRI
GD-3RI
SD-3NC
SD-3DNC
GD-3NC
SD-3EC
SD-3DEC
GD-3EC
SD-3ECS
SD-3DECS
GD-3ECS
SD-3SC

Alarm relay(contact output)/

DigitalResistance load

communication

only

24 V DC(18 V - 30 V
DC Max)

3.8 W Max0 - 22 mA withHART―

30 V DC, 1 A
250 V AC, 2 A

RS-485 output

1.2 W Max

―

―

―

―

24 V DC(18 V - 30 V
DC Max)

4.5 W Max0 - 22 mA withHART―

30 V DC, 1 A
250 V AC, 2 A

RS-485 output

2 W Max

―

―

―

―

2.8 W Max0 - 22 mA withHART―

30 V DC, 1 A
250 V AC, 2 A

RS485 output

1 W Max

―

―

―

―

2.8 W Max0 - 22 mA withHART―

30 V DC, 1 A
250 V AC, 2 A

RS485 output

1 W Max

―

―

―

―

5 W Max

0 - 22 mA withHART―

30 V DC, 1 A
250 V AC, 2 A

RS-485 output

24 V DC
(18 - 30 V DCMax）
24 V DC
(18 - 30 V DCMax）
24 V DC(18 V - 30 V
DC Max)<Certificate numbers>
 FM22US0043X
 FM22CA0030X
 FM22ATEX0019X
 IECEx FMG 22.0011X* The “X” at the end of the certificate number indicates the following special operating conditions:・ The flameproof joints are not intended to be repaired
・ Equipment must only be placed in areas with low risk of mechanical danger(according to clause 26.4.2 of
ANSI/UL 60079-0:2019、26.4.2 of CAN/CSA-C22.2 No. 60079-0:2019).
・ Avoid rubbing the nameplate area with a dry cloth during use, maintenance, or cleaning. Doing so may
result in a static charge buildup of up to 6 nF.
・ Refer to manufacturer’s instructions for ambient temperature.
・ If the surge protection device (lightning arrester) is attached to the flameproof enclosure, it shall be
provided with a high strength locking compound on the mounting thread.
・The IP ratings are IP44 for the infra-red sensors and IP67 for the ceramic sensors.(according toclause ANSI/FM 60079-29-1)
・The IP ratings of electrochemical sensors are IP44 for the ESF-A24R and IP67 for the ESF-A24R3.
・For situations where the detector has been submerged in water, refer to the Safety Information sectionof the user manual.
・The GD-3 Series remote gas detectors are only for use with the SD-3SC transmitter.

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2. Important Safety Information

2-4 Safety information<System configuration diagrams>

Installation diagram
Hazardous area
(Zone 1)Non-hazardousarea

Gas detector (SD-3)
Display
POW(+)COM(−)
Sig(+)
Sig(−)

Signal cable

POW(+)COM(−)
Sig(+)
Sig(−)

Installation diagram
Hazardous area
(Zone 1)Non-hazardousarea

Gas detector (SD-3)
Display
POW(+)COM(−)
Sig(+)
Sig(−)

RLY

Signal cable

Signal cable

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POW(+)COM(−)
Sig(+)
Sig(−)RLY

2. Important Safety Information

2-4 Safety information

Installation diagram
Hazardous area
(Zone 1)Non-hazardousarea

Gas detector (SD-3 (RS-485))
Display
POW(+)COM(−)
Sig(+)
Sig(−)

Signal cable

RS-485Signal cable

POW(+)COM(−)
Sig(+)
Sig(−)

RS-485

Installation diagram
Hazardous area
(Zone 1)Non-hazardousarea

Gas detector (SD-3SC)
Display

Remote sensor head
(GD-3)
POW(+)COM(−)
RS-485(Y)RS-485(Z)Signalcable

POW(+)COM(−)
Sig(+)
Sig(−)

Signal cable

POW(+)COM(−)
RS-485(Y)RS-485(Z)13 / 71

POW(+)COM(−)
Sig(+)
Sig(−)

2. Important Safety Information

2-4 Safety information

Installation
diagramHazardous area
(Zone 1)Non-hazardousarea

Gas detector (SD-3SC)
Display

Remote sensor head
(GD-3)
POW(+)COM(−)
RS-485(Y)RS-485(Z)Signalcable

POW(+)COM(−)
Sig(+)
Sig(−)

Signal cable

POW(+)RLY
COM(−)
RS-485(Y)RS-485(Z)Signal cable

POW(+)COM(−)
Sig(+)
Sig(−)

RLY

Installation diagram
Hazardous area
(Zone 1)Non-hazardousarea

Gas detector (SD-3SC)
Display
POW(+)COM(−)
Sig(+)
Sig(−)

Signal cable

Remote sensor head
(GD-3)
POW(+)COM(−)
RS-485(Y)RS-485(Z)Signalcable

RS-485
POW(+)COM(−)
RS-485(Y)RS-485(Z)POW(+)COM(−)
Sig(+)
Sig(−)

RS-485Signal cable

14 / 71

2. Important Safety Information

2-4 Safety information

CAUTION Install the product in accordance with the required installation conditions.
 Do not disassemble, modify, or alter the product.
 Contact Riken Keiki to request readjustment or parts replacement including calibration.
 Use cable lugs for grounding wire and bonding conductor connections. Make sure the bonding
conductors are not loose or twisted.
 Do not open the cover in locations where explosive gas may be present.
 The maximum pressure inside the gas channels and sensor is 10.13 kPa (gauge pressure).
 Be sure to connect the grounding terminal before turning on the power to the product.
 Make sure the grounding is Class D equivalent (grounding resistance less than 100 Ω).
 Use crimped terminals to connect the grounding wire to the grounding terminal inside the unit. Use acable with a cross section area of at least 4 mm2 to connect to the external grounding terminal.
 Use approved cable glands when installing.
 If the product is installed in a location where the ambient temperature exceeds 65 °C, use cables
designed for use at temperatures at least 5 °C above the maximum ambient temperature.
 Do not subject the window in the cover to strong forces or impact. Doing so may result in damage andimpaired explosion-proof performance. (The low risk of mechanical hazards has been confirmed in
testing [2 joules].) Do not use more than one adapter per connector.

CAUTION
With suction type
 Use with a flow rate of at least 0.4 L/min and not exceeding 1.5 L/min.

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2. Important Safety Information

2-4 Safety information

Putting into service
Type and size of screw at external entry of SD-3.
Entry3

Entry4

Entry2

Entry1

Entry5

Entry6
Entry1

Entry2

Entry3

Entry4

Entry5

Entry6

M25×1.5

〇

〇

✕

〇

〇

〇

NPT1/2-14

〇

〇

〇

〇

✕

✕

NPT3/4-14

〇

〇

✕

〇

✕

✕

No hole

✕

✕

〇

〇

〇

✕

〇：Correspondence is possible✕：Correspondence is impossible
The above table shows type and size of screw at external entry of SD-3.Each of our component andsensor assembly can be connected to Entry 1 to Entry6.
The following table shows the connectable components of each entry. When connecting each component,
the body needs to have screw holes suitable for each component.Entry1, Entry2, Entry4, Entry6 can be also
be cable entry. Entry 6 is used to connect GD-3. When connecting GD-3, use a certified cable gland. The
number of entry for external cable that can be used simultaneously is two (Excluding entry 6) .Use only
certified components for entry 1 to entry 6. For entry 2 or for entry 4, can use a certified surge protection
device. Entry 3 can use a certified wireless HART adapter. Unused opening entries must be closed off withplugs.

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2. Important Safety Information

2-4 Safety information

Entry1

Entry2

Entry3

Entry4

Entry5

Entry6

Sensor Assembly

✕

✕

✕

✕

✕

〇

EC Barrier

✕

✕

✕

✕

✕

〇

Certified cable gland

〇

〇

✕

〇

✕

〇

M25 Plug

〇

〇

✕

〇

〇

〇

NPT1/2 Plug

〇

〇

〇

〇

✕

✕

Conversion adapter

〇

〇

✕

〇

✕

〇

〇

〇

✕

〇

✕

〇

〇

〇

✕

〇

✕

〇

Surge protection device

✕

〇

〇

〇

✕

✕

Wireless HART adapter

✕

✕

〇

✕

✕

✕

(M25⇔NPT1/2)
Conversion adapter(M25⇔NPT3/4)
Conversion adapter(M25⇔M20)〇：Connectable✕：Unconnectable
Tighten 30 N·m or larger torque value to ensure the tightening M25 Plug and Conversion adapter.
Tighten 10 N·m or larger torque value to ensure the tightening NPT1/2 Plug.
The thread engagement should be 5 or more.

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2. Important Safety Information

2-4 Safety information

External entry of GD-3.

Entry1

Entry2

Entry3
Combination table of external entry
Entry1

Entry2

Entry3

Sensor Assembly

✕

✕

〇

EC Barrier

✕

✕

〇

Certified cable gland

〇

〇

✕

M25 Plug〇〇〇

NPT1/2 Plug

〇

〇

〇

Conversion adapter

〇

〇

〇

〇

〇

〇

〇

〇

〇

(M25⇔NPT1/2)
Conversion adapter(M25⇔NPT3/4)
Conversion adapter(M25⇔M20)〇：Connectable✕：Unconnectable
Tighten 30 N·m or larger torque value to ensure the tightening M25 Plug and Conversion adapter.
Tighten 10 N·m or larger torque value to ensure the tightening NPT1/2 Plug.
The thread engagement should be 5 or more.

18 / 71

2. Important Safety InformationNo

2-4 Safety information

COMPONENT

manufacturer

name/protection

CERTIFICATES

RATINGS

number&edition

voltage,standards

code

current,
temperature

1

Eaton Electric

TP48 and TP32 Series

II 2 G Ex

IECEx BAS

EN 60079-

LimitedSurge Protection

db IIC T6

15.0056X

0:2012+A11:2013-40ºC

Devices

Gb

Issue 1

EN 60079-1:2014

to+70ºC

Baseefa 04

IEC 60079-0:2011

48 VDCATEX 0053X

Edition:6.0

NPT ½”IEC 60079-1:2014
Edition:7.02

Pepperl+Fuchs

WHA-BLT-F9D0-N-A0-

II 2 G Ex

IECEx FMG

EN 60079-

T6： -40°C

GmbH

Z1-1

db IIC17.0020X

0:2012+A11:2013 ,to 75°C,

T6...T5

Issue 0EN 60079-1:2014

T5：-40°C

Gb

FM 17 ATEX

IEC 60079-0:2011

to 85°C

0046 X

Edition:6.0

7〜32 VIEC 60079-1:2014

DC

Edition:7.0

NPT ½”

・In the case of using Surge Protection Devices, the lower limit of ambient temperature of SD-3 or GD-3 is -40℃.
・In the case of using WHA-BLT-F9D0-N-A0-Z1-1(WirelessHART Adaptor), the lower limit of ambient temperature of SD-3 or GD-3
is -40℃.

19 / 71

2. Important Safety Information

2-4 Safety information<Connection examples>
SD-3SCGD-3RI

SD-3SCGD-3ECB

20 / 71

2. Important Safety Information

2-4 Safety information<Exploded view><SD-3>

Container

Cover
Blanking plug

Blanking plug

Gas sensor
Sensor guard<GD-3>

Container

Cover
Blanking plug

Gas sensor

Sensor guard

21 / 71

2. Important Safety Information

2-4 Safety information<Screw holes on rear of container (SD-3)>
Four screw holes are located on the rear of the main unit container.
• Screw size: M5• Pitch: 0.8• Screw depth: 5• Maximum allowable length of male screw:
Lmax = 4.2 mm + x(“x” is the intermediate part thickness.)

Screw holes on rear ofcontainer (four locations)<Screw holes on rear and underside of container (GD-3)>
There are four screw holes on the rear of the container and four screw holes on the underside.
• Screw size: M5• Pitch: 0.8• Screw depth: 5• Maximum allowable length of male screw:
Lmax = 4.2 mm + x(“x” is the intermediate part thickness.)<Container rear>
Screw holes on rear of container(four locations)<Container underside>

Screw holes on underside ofcontainer (four locations)

22 / 71

3. Product Configuration

3-1 Main unit and accessories

3

Product Configuration
3-1 Main unit and accessories
Please refer to the Technical Manual for SD-3series (PT2E-287).

3-1-1

Main unit (SD-3)

Please refer to the Technical Manual for SD-3series (PT2E-287).

3-1-2

Main unit (SD-3SC)

Please refer to the Technical Manual for SD-3series (PT2E-287).

3-1-3

Remote sensor head (GD-3)

Please refer to the Technical Manual for SD-3series (PT2E-287).

3-1-4Standard accessories

Please refer to the Technical Manual for SD-3series (PT2E-287).

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3. Product Configuration

3-1-5

3-1 Main unit and accessories

Optional accessories
Optional accessory

Calibration adapter(for IRF sensor)

Calibration adapter(for NCF gas sensor)

Calibration adapter(for ESF sensor)

Splash guard(for IRF sensor)

Splash guard(for NCF gas sensor)

Splash guard(for ESF gas sensor)

24 / 71

Part No.

Description

4283 9011 00

Calibration adapter for the
SD-3RI<Material>
Body: PP
Nipple: Stainless steel/Teflon

4283 9012 70

Calibration adapter for the
SD-3NC<Material>
Body: PP
Nipple: Stainless steel/Teflon

4283 9013 40

Calibration adapter for theSD-3EC/ECB<Material>
Body: PP
Nipple: Stainless steel/Teflon

4283 9076 10

SD-3RI cover to protect
sensor from water and dust
The identification number “1”is engraved on the underside.
<Material>Resin4283 9077 80

SD-3NC cover to protect
sensor from water and dust
The identification number “2”is engraved on the underside.
<Material>Resin4283 9078 50

SD-3EC/ECS cover to protect
sensor from water and dust
The identification number “3”is engraved on the underside.
<Material>Resin3. Product Configuration

3-1 Main unit and accessories

Optional accessory

Part No.

Blanking plug

4283 9018 10

Description

M25 × 1.5 blanking plug
<Material>
Equivalent to SUS316

4283 9058 70

Adapter to convert M25 × 1.5
screw thread to 1/2NPT screw
thread<Material>
Equivalent to SUS316

4283 9057 00

Adapter to convert M25 × 1.5
screw thread to 3/4NPT screw
thread<Material>
Equivalent to SUS316

Adapter

4283 9047 10

Adapter to convert M25 × 1.5
screw thread to M20 × 1.5
screw thread<Material>
Equivalent to SUS316

Lightning arrester (3wire connection)(TP48-3-N-NDI)

2032 0099 50

Device to limit momentary
surge voltages caused bylightning strikes

Lightning arrester (4wire connection)(TP48-4-N-NDI)

2032 0116 40

Device to limit momentary
surge voltages caused bylightning strikes

Adapter

Adapter

25 / 71

3. Product Configuration

3-2 Part names and functions

3-2 Part names and functions＜SD-3＞<Display (same for both SD-3 and SD-3SC)>⑥ ⑦ ⑧ ⑨ ⑩

①

④

②

⑭
⑤

③

＜SD-3SC＞

⑪ ⑫ ⑬

No.
①

②
③

④
⑤
⑥
⑦
⑧
⑨
⑩
⑪

Name
MENU/ESC key

Function
Hold down this key in detection mode to switch to user mode.
In user mode and maintenance mode, this key is used to cancel a settingor return to the previous screen.
Hold down this key in user mode or maintenance mode to return todetection mode.
7-segment LED display Displays the gas concentration and other information.
Press in detection mode to display the ALM1 (first alarm) and ALM2
SET key(second alarm) alarm setpoints.
In user mode and maintenance mode, this key is used to confirm a value
or select a setting.
In user mode and maintenance mode, this key is used to select a setting▲ key
item and adjust (increase) a value.
In user mode, this key is used to switch menus or adjust (lower) a value.
▼ key
Press in detection mode to display the external output.
Powerlamp. Lights up in green when the power is on.
Power lamp
The lamp flashes in green in user mode and maintenance mode.
(POWER)
ALM1 (first alarm) alarm lamp. Lights up in red when the ALM1 (first alarm)
Alarm lamp (ALM1)
alarm setpoint is reached.
IrDA communication port
Infrared port
ALM2 (second alarm) alarm lamp. Lights up in red when the ALM2
Alarm lamp (ALM2)(second alarm) alarm setpoint is reached.
Fault lamp. Lights up in yellow when an abnormality is detected in the product.
Fault lamp (FAULT)PPM lamp⑫%LEL lamp⑬% lamp⑭

SensorLights up in green when a ppm concentration range gas concentration isdisplayed.
Lights up (green) when a gas concentration within the %LEL concentration
range is displayed.
Lights up in green when a vol% concentration range gas concentration isdisplayed.
Incorporates a gas-detecting sensor.

26 / 71

3. Product Configuration

3-3 Block diagrams

3-3 Block diagrams
The block diagrams (electrical circuit diagrams) for the product are given below.

<SD-3>
Power supply unit
24 V DC

Display (LED)・ POWER・ ALM1
・ ALM2
・ FAULT・ PPM
・ %LEL
・ %Power supply voltage converter

External output
4 - 20 mA with HART

HART modem

Alarm contact output (option)
1. Gas alarm output (ALARM1)
2. Gas alarm output (ALARM2)
3. Fault output (FAULT)

Control
unit
CPU

Display
7-segment LED

Magnetic operation part・ MENU/ESC
・ SET
・ ▲
・ ▼

Contact operation
Normal measurement:
De-energized
Alarm state: EnergizedSensor

27 / 71

3. Product Configuration

3-3 Block diagrams<SD-3SC>Power supply unit
24 V DC

Display (LED)・ POWER・ ALM1
・ ALM2
・ FAULT・ PPM
・ %LEL
・ %Power supply voltage converter

External output
4 - 20 mA with HART

HART modem

Alarm contact output (option)
1. Gas alarm output (ALARM1)
2. Gas alarm output (ALARM2)
3. Fault output (FAULT)

Control
unit
CPU

Display
7-segment LED

Magnetic operation part・ MENU/ESC
・ SET
・ ▲
・ ▼

Contact operation
Normal measurement:
De-energized
Alarm state: Energized

GD-3<GD-3>

SD-3SC
Controlunit
CPUPower supply voltage converter

28 / 71

Sensor4. Installation

4-1 Installation precautions

4

Installation
4-1 Installation precautions
4-1-1

General installation information

 It is not permitted to prevent gases and vapors contacting the sensor.
Dirt, snow, mud, external devices, etc.
 If there is dust or water droplets on the sensor, remove them as appropriate. If there is dust or water in thesplash guard, remove them.
 If the sensor is damaged, replace it.
 The IP class does not mean that the device is capable of detecting gas during or after exposure to these
conditions.
 It is recommended that the detector is installed so that the sensor faces downward. If the sensor if protectedfrom mechanical damage, dirt, and water, then it can be installed facing in another direction.
 The NCF and ESF sensor may slow down its response if water adheres to the Teflon membrane.
In the event of heavy rain or submersion, visually check the surface of the Teflon film on the NCF and ESF
sensor.
[Confirmation procedure]① Turn off the power of SD-3.
② Remove the sensor guard.
③ Wipe off the Teflon film if water droplets are attached.
* For wiping, use paper such as Kimwipe that is hard to tear and does not generate paper dust.
④ Visually check the Teflon film and confirm that the water droplets have disappeared.
⑤ Install the sensor guard.
⑥ Turn on the power of the main unit.
⑦ In order to completely dry the Teflon film, warm it up for 10 minutes before use.

4-1-2

Restrictions regarding installation<Do not install in locations exposed to water, oil, or chemicals.>
Avoid installing in locations associated with risk of splashing water, oil, chemicals, or other liquids. Deploy the
optional protective cover (main unit protection) and splash guard (sensor protection) if the product must be
installed in a location where it may be exposed to these factors.

<Note when installing in locations where interference gases are present.>
Take care when installing in locations where the following interference gases are present:
Sensor typeInterference gas
NCF

Hydrocarbons, alcohols, organic solvents, etc. other than the target gas

IRF

Combustible gas sensor: Hydrocarbons, alcohols, organic solvents, H2O, etc., otherthan the target gas
CO2 sensor: CO, N2O, NO, etc.

ESF

Differs depending on sensor. (e.g., H2 with CO sensor)

29 / 71

4. Installation

4-1 Installation precautions<Use the appropriate power supply and power cable.>
The product requires a 24 V DC (18 V - 30 V DC) power supply to operate. The power cable used should havea cross section of 1.308 mm2 (AWG16) or 2.082 mm2 (AWG14). Use shielded 3-core cable or 4-core cable.
For the installation of cables and power supply
Due to the resistor value of the cable, a voltage drop occurs, causing the actual voltage supply to SD-3 (at theSD-3 terminal) to be lower than the voltage supply at the power source. Because of this, when the voltage
drop by the cable causes the actual voltage supply to become below 18VDC, the voltage supply at the powersource needs to be increased.
This voltage drop is determined by the type and length of the cable, ambient temperature, as well as the current
consumption value of SD-3.
The current consumption value of SD-3 varies depending on the sensor type and the alarm relay state in the
SD-3.
<How to obtain the voltage supply at the power source -1>
Use the equation below to obtain the voltage supply value at the power source.
Voltage supply at the power source= A (Current consumption of SD-3) x B (Resistor value of the cable to be installed) + 18V
A: Current consumption of SD-3
Choose from the list below.（＠18V）
Type
Current
consumption (max.)
SD-3RI
170mA
SD-3NC
200mA
SD3-EC
140mA
SD-3ECS
140mA
SD-3SC + GD-3RI
180mA
SD-3SC + GD-3NC
220mA
SD-3SC + GD-EC
150mA
SD-3SC + GD-3ECS
150mA

Remarks

B: Resistor value of the cable to be installed
The maximum resistor value can be determined by the type and length of the cable to be installed,
and the upper limit of the operating temperature.
e.g.)
A: The maximum current consumption value = 170 mA (SD-3RI)
B: The maximum resister value of the cable to be installed = 24Ω (CVV-S, 1.308 mm2, 1250m, ＠70℃)
Voltage supply at the power source = 170mA x （24Ω x2）＋18V= 8.16V＋18V= 26.16V (or higher)<How to obtain the voltage supply at the power source -2>
When the method in 1 cannot be applied because the type and length of the cable to be installed is unknown, or
to make sure if the voltage calculated in 1 poses no problem for the actual voltage to supply, use this method
described here.
Alarm test is performed under the following conditions (refer to ‘7-3-2 Performing alarm test’ in the Technical
Manual for SD-3 series (PT2E-287)).
Set the contact action ON.
Press ▲ key to increase the indicator until it reaches full scale over (nnnn), and when that happens, make surethat the voltage of the SD-3 terminal block is over 18VDC.
30 / 71

4. Installation

4-1 Installation precautions

Fault test is performed under the following conditions (refer to ‘7-3-3 Performing fault test’ in the Technical
Manual for SD-3 series (PT2E-287)).
Set the Fault test ON.
When that happens, make sure that the voltage of the SD-3 terminal block is over 18VDC.
If it’s below 18VDC, then increase the voltage supply at the power source. If the temperature at this point
increases during the operation, give enough margin to the voltage supply by compensating the voltage drop
caused by the increase of the cable resistor value.

31 / 71

4. Installation

4-2 System design precautions

4-2 System design precautions
Please refer to the Technical Manual for SD-3series (PT2E-287).

4-3 Providing maintenance space
Please refer to the Technical Manual for SD-3series (PT2E-287).

4-4 Main unit installation
Please refer to the Technical Manual for SD-3series (PT2E-287).

4-5 Remote sensor head (GD-3) installation
Please refer to the Technical Manual for SD-3series (PT2E-287).

4-6 Connecting the grounding terminal
Please refer to the Technical Manual for SD-3series (PT2E-287).

4-7 Connecting the power and signal cables
Please refer to the Technical Manual for SD-3series (PT2E-287).

4-8 Mounting the sensor
Please refer to the Technical Manual for SD-3series (PT2E-287).

4-9 Alarm relay setting (option)
Please refer to the Technical Manual for SD-3series (PT2E-287).

4-10 Mounting the splash guard
Please refer to the Technical Manual for SD-3series (PT2E-287).

32 / 71

5. Usage Instructions

4-10 Mounting the splash guard

5

Usage Instructions
Please refer to the Technical Manual for SD-3series (PT2E-287).

33 / 71

6. Alarm Activation

6-1 Gas alarm activation

6

Alarm Activation
6-1 Gas alarm activation
Please refer to the Technical Manual for SD-3series (PT2E-287).

6-1-1

Alarm activation

Please refer to the Technical Manual for SD-3series (PT2E-287).

6-1-2

Contact operation (auto reset)

Please refer to the Technical Manual for SD-3series (PT2E-287).

6-1-3

Contact operation (self-latching)

Please refer to the Technical Manual for SD-3series (PT2E-287).

34 / 71

6. Alarm Activation

6-1-4

6-2 Fault alarm activation

Alarm response

If an alarm is triggered, respond promptly in accordance with the user’s management rules.
The typical procedures are as follows:
Step 1 Check the reading on the product.

CAUTION In the case of momentary gas leaks, the reading may have already dropped by the time the reading ischecked. The reading may also drop while in a temporary alarm state due to factors other than gas
alarms, such as noise or incidental conditions.
Step 2 Keep all individuals out of the monitored zone to ensure safety in accordance with your alarm
control concentrations.
Step 3 If the concentration display continues, close the main valve for the gas involved and confirm
that the gas concentration reading has fallen.
Step 4 Approach the gas leak location and use a portable gas detector to check for the presence of any
remaining gas.

CAUTION To avoid hazards while carrying out this work, assume that the gas is still present and wear theappropriate gear.
Step 5 Once you have determined that no hazard remains, take action to fix the gas leak.

6-2 Fault alarm activation
A fault alarm is triggered if an abnormality is detected in the product.
If a fault alarm occurs, the fault lamp (FAULT) illuminates in yellow, and an error code is displayed as follows:<In case of sensor abnormality>
Fault lamp (FAULT)FAULT lit (yellow)

NOTE
 After the product has successfully recovered from the fault, it will initialize and restart.
 For more information on fault details (error codes) and appropriate corrective action, refer to‘9. Troubleshooting’.
 If a fault alarm occurs, determine the cause and take appropriate action. If the product has problems andfaults occur repeatedly, contact Riken Keiki immediately.

35 / 71

6. Alarm Activation

6-3 Warning operation

6-3 Warning operation
Please refer to the Technical Manual for SD-3series (PT2E-287).

6-4 External output operation
Please refer to the Technical Manual for SD-3series (PT2E-287).

6-5 Functions to ensure correct alarm activation
6-5-1

Zero suppression function

The sensors used in the product are susceptible to the effects of ambient fluctuations (e.g., temperature andhumidity characteristics) and interference gases (interference characteristics), which affect the readings givenby the product. Therefore, readings may fluctuate around zero levels even under normal conditions.
The zero suppression function is designed to minimize the effects of these ambient fluctuations and interference
gases around the zero level. Use this function to suppress reading fluctuations below the preset value to give azero reading (or [20.9] (vol%) for oxygen).
<Zero suppression function disabled><Zero suppression function enabled>

The reading fluctuates around the zerolevel.

Displays zero up to the preset value.

6-5-2

Automatic sensor recognition function

Please refer to the Technical Manual for SD-3series (PT2E-287).

36 / 71

7. Maintenance

7-1 Maintenance intervals and items

7

Maintenance
7-1 Maintenance intervals and items
The following items should be maintained regularly before using the product:• Daily maintenance:
Perform maintenance before commencing work.
• Monthly maintenance: Inspect the alarm circuit (alarm test) once a month.
• Regular maintenance: Confirm and adjust the measurement accuracy with the calibration gas
concentration. The order of calibration is zero adjustment first and then span
adjustment.
Maintenance
item

Maintenance details

Daily
maintenance

Monthly
maintenanceRegularmaintenancePower supply
check

Check to confirm that the power lamp
is lit.

〇〇〇Concentration
display check

Check to confirm that the concentration
reading is zero (or [20.9] (vol%) for
oxygen).
If the reading is offset, perform zeroadjustment after confirming that nointerference gas is present in thevicinity.

〇〇〇

Use the alarm test function to checkthe alarm circuit.
If you use an optional alarm relay,
check the relay at the same time.

－

〇

〇

Calibration

Perform sensitivity calibration using acalibration gas.

－

－

〇

Gas alarm check

Check the gas alarm using a calibration
gas.

－

－

〇

Grounding cablecheck

To ensure EMC performance, check to
confirm that the grounding cableconnection is secure and free ofcorrosion.

－

－

○

Alarm test

<Maintenance services>
Riken Keiki provides services related to regular maintenance including calibration, adjustments, and servicing.
Preparing a calibration gas requires dedicated equipment, including gas cylinders of the specified concentrationand gas sampling bags.
Our certified service engineers have expert knowledge of the dedicated tools and products. We recommend
taking advantage of our maintenance service to ensure safe use of the product.

37 / 71

7. Maintenance

7-1 Maintenance intervals and items

The main details of the maintenance services are as follows. Please contact Riken Keiki for more information.
Service

Service details

Power supply check・ Check the power supply voltage.
・ Check to confirm that the power lamp is lit.
(Confirm that the power lamp (POWER), alarm lamps (ALM1, ALM2), fault lamp
(FAULT), unit lamps (PPM, %LEL, %) are clearly visible on the display.)
・ Check the operation of the UPS (uninterruptible power system), if used.

Concentration
display check

Check to confirm that the concentration reading indicates zero using a zero
calibration gas. Perform zero calibration if the reading is not zero.
With the oxygen deficiency alarm specifications, introduce clean air and check thatthe concentration reading indicates [20.9] (vol%). Perform span adjustment if thereading is offset.

Filter check

Check to confirm that the dust filter is neither contaminated nor clogged.
Replace the filter if the filter is dirty or clogged.

Alarm test

Use the alarm test function to inspect the alarm circuit.
・ Check alarm lamps. (Check the ALM1 and ALM2 operations.)
・ Check external alarms. (Check the buzzer, reset signal, and other external
alarm operations.)

Calibration

Perform sensitivity calibration using a calibration gas.

Gas alarm check

Check the gas alarm using a calibration gas.
・ Check alarms. (Confirm alarm activation when alarm setpoint is reached.)
・ Check delay time. (Check delay time until alarm activation.)・ Check alarm lamps. (Check the ALM1 and ALM2 operations.)
・ Check external alarms. (Check the buzzer, reset signal, and other external
alarm operations.)

Product cleaning
and repair (visualinspection)

Check the product exterior, cover, and interior for dirt and damage. Clean/repair
problem areas.
Replace cracked or damaged parts.

Product operation
check

Operate the keys to check individual functions and parameters.

Consumable part
replacement

Replace degraded components such as sensors and filters.

<Proof tests>
Regular proof testing is a requirement according to the standards regarding the degradation of measurement
performance. The effects of the environment and changes to the application of the detector can have negative
effects on measurement and signal performance. Proof tests must be performed regularly. Determine theinterval for proof tests according the application of the detector.

<Checking indication accuracy>
Regular proof testing is a requirement according to the standards regarding the degradation of measurement
performance. Maintenance must be performed regularly. The inspection interval depends on the ambientconditions in which the sensor operates. The sensor drifts due to ambient conditions and aging deterioration.
Sensor drift has an adverse effect on measurement accuracy. This accuracy can be recovered by calibration.
Shorter check intervals may need to be established according to the severity of the drift. To evaluate the ambientconditions in a new facility, it is necessary to establish shorter check intervals to record the drift. It is necessary forthe plant operator to establish the check intervals based on the data they acquire. Under normal circumstances,
RIKEN KEIKI recommends the following check intervals.
[Recommended check intervals]
IRF: 6 to 12 months
NCF: 6 to 12 months
38 / 71

7. Maintenance

7-1 Maintenance intervals and items

ESF: 6 months to 12 months[Check items]
Indication accuracy: zero reading, gas reading
Response<Visual inspection>
It is necessary to perform a visual inspection of the gas detector to check whether there are external
obstructions to the flow of gas/vapor to the sensor. Things that may be included are debris, dirt, snow, mud,external devices, etc. Corrective measures include removal of such blockages if they exist.
Depending on the environment, it may be necessary to make inspections at short intervals.
1. If necessary, remove protective devices (splash guard, etc.).
2. Check whether there are external obstructions to the detector. For example, debris, dirt, snow, mud,external
devices, etc.
3. If such blockages exist, remove them.
4. Check the status LED/display.

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7. Maintenance

7-2 Maintenance mode

7-2 Maintenance mode
Please refer to the Technical Manual for SD-3series (PT2E-287).

7-3 Performing tests (test mode)
Please refer to the Technical Manual for SD-3series (PT2E-287).

40 / 71

7. Maintenance

7-4 Performing calibration

7-4 Performing calibration
7-4-1

Calibration preparation

Before performing calibration (zero calibration and span adjustment), prepare the calibration gas.
Also connect the calibration equipment required to the product before starting.
 Zero calibration gas
 Span adjustment gas (in gas sampling bag or gas can)
 Gas sampling bag for exhaust gas
 Calibration adapter or splash guard<List of adjustment jigs>
Item nameCalibration
adapter

Pump

Flowmeter
Stopwatch

Applicable specifications
Dedicated adapter for IRF sensor

Part No.: 4283 9011 00

Dedicated calibration adapter for
combustible F sensors

Part No.: 4283 9012 70

Dedicated adapter for ESF sensor

Part No.: 4283 9013 40

One that can provide a flow rate of 0.5 mL or greater
Explosion-proof specifications
Measures tolerances to 0.1 ml.
Has passed regular inspection.
Has passed regular inspection
Material: polyurethaneFor general combustible gases

Internal diameter: 4 mm
Pipe length between gas and adapter: Within
1mMaterial: Teflon

PipingFor organic solvents

Internal diameter: 4 mm
Pipe length between gas and adapter: Within
1mMaterial: Teflon

For strongly adsorptive gases

Internal diameter: 4 mm
Pipe length between gas and adapter: Within
10cm

41 / 71

7. Maintenance

7-4 Performing calibration<List of adjustment conditions>Gas
detectormodel
SD-3RI
SD-3DRI
GD-3RI
SD-3NC
SD-3DNC
GD-3NC
SD-3EC
SD-3DEC
GD-3EC
SD-3ECS
SD-3DECS
GD-3ECS

Sensormodel
IRF-1301
IRF-1317
IRF-1315

Detection
targetChemical
Detection
formula concentration

Methane

CH4

Zero gas

Calibration gas
Calibration gas
concentration
Dilution gas(alternative gas)(alternative gas
concentration)
MethaneN2
50 %LEL

100 %LEL

N2

PropanePropanePropane

C3H8

100 %LEL

N2

C3H8

100 vol%

N2

MethaneCH4

100 %LEL

Atmospheric
Methaneair

Atmospheric
50 %LELair
Atmospheric
50 %LELair

NC-6318

Propane(isobutane)
Propane

N2
N2

50 %LEL(40 %LEL)
80vol%

Calibrationcap

ApplicableTimeflow rate for required
Samplecalibrationforflow ratejig
calibration

Remarks

For IRF sensor 0.5 ±(4283 9011 00) 0.1 L/min

120
seconds

0.4 1.5 L/min

Warm up for at least 10 minutes
before making adjustments.

For combustible
0.5 ±F sensor
0.1 L/min(4283 9012 70)

60 seconds

0.4 1.5 L/min

Warm up for at least 30 minutes
before making adjustments.

Hydorogen

H2

100%LEL

AtmosphericHydrogenair

ESF-A24R3

HydrogensulfideH2S

100 ppm

N2

Hydrogen Sulfide N2

32 ppmFor ESF sensor 0.5 ±(4283 9013 40) 0.1 L/min

60 seconds

0.4 1.5 L/min

ESF-A24R

HydrogensulfideH2S

100 ppm

N2

Hydrogen Sulfide N2

32 ppmFor ESF sensor 0.5 ±(4283 9013 40) 0.1 L/min

60 seconds

0.4 1.5 L/min

At temperatures below -25℃, allow
to acclimatize for the operating
environment before adjustments.
At temperatures below -25℃, allow
to acclimatize for the operating
environment before adjustments.

* For FM specifications, do not use alternative gas for adjustment.

<When using the calibration adapter>
NOTE Use a flow rate of 0.5 ± 0.1 L/min when calibrating. Calibration accuracy may be reduced if calibration is
performed using a different flow rate.
 Leaving the suction cap and calibration adapter attached in a windless state for 10 minutes or more may
cause adsorbed gas to accumulate, which can cause the reading rise. If this occurs, push clean air
through to return the reading to zero. Furthermore, as the sensor will be shut off from the atmosphere inthis state, it will not be monitoring.

<Using a gas sampling bag>

RI

EC

Product (SD-3)

Flowmeter
Pump
Out
Calibration
adapterGassamplingbag

P

Needle valveIn

42 / 71

To exhaust
port7. Maintenance

7-4 Performing calibration<Using a gas sampling bag>

NC

Product (SD-3)

Calibration adapteraFlowmeterInGassamplingbag

Pump
To exhaust port

P

Out
Needle valve* The diagram illustrates the SD-3. The connection method is the same for the remote sensor head (GD-3).

43 / 71

7. Maintenance

7-4 Performing calibration

RI<Using a gas can>EC

Product (SD-3)

Out

In

<Using a gas can>To exhaust
port

Calibration
adapterNC

Product (SD-3)

In

Out
To exhaust
port

Calibration
adapter* The diagram illustrates the SD-3. The connection method is the same for the remote sensor head (GD-3).

44 / 71

7. Maintenance

7-4 Performing calibration<When using the splash guard>
NOTE The calibration adapter is not required when using the splash guard.
 When using the splash guard, calibrate using the following wind speed:Detection principle

Wind speed

Non-dispersive infrared absorption type(infrared type)Max. 6 m/s

New ceramic type
Electrochemical typeMax. 1 m/s

 If calibration is unsuccessful, fit the calibration adapter and calibrate again.
 When calibrating adsorptive gas, fit the calibration adapter.
 Use a flow rate of 0.5 L/min ±0.1 L/min when calibrating. Calibration accuracy may be reduced if
calibration is performed using a different flow rate.

<Using a gas sampling bag>

Product (SD-3)

Splash guard

Flowmeter
Pump
Gas
samplingbag

P
Needle valve*The diagram illustrates the SD-3. The connection method is the same for the remote sensor head (GD-3).

45 / 71

7. Maintenance

7-4 Performing calibration<Using a gas can>Splash guard
In* The diagram illustrates the SD-3. The connection method is the same for the remote sensor head (GD-3).

<Checking for piping leaks>
 Make a visual inspection for cracks in the pipes.
 When installed according to the piping diagram and with the calibration adapter covering the gas inlet,confirm that the flowmeter indicates zero.
 If the flowmeter does not indicate zero, there is a leak between the gas inlet and the pump.
 Make a visual inspection for cracks in the rubber seals on the pipes and calibration adapter.
 When using a gas cylinder for calibration, use the pump to perform checks for leaks using the same method
before connecting the cylinder.
 If this does not solve the issue, the matter needs to be checked by a qualified service engineer. To ensure
safety and the stable operation of the product, request checking by a qualified service engineer. Also, as amethod for determining the locations of leaks, we recommend our leak tester. Contact RIKEN KEIKI torequest checking.

WARNING If you use a method of applying pressure by introducing air through the gas inlet and blocking the gas
outlet, adapters and pipes may become disconnected with great force.

<Calibration adapter> There are different calibration adapters for different models.
 For IRF, use the dedicated adapter for IRF sensors; for NCF, use the dedicated adapter for combustible gas
sensors; for ESF, use the ESF dedicated adapter.
Dedicated adapter for IRF sensor
Calibration adapter
 (for IRF sensor)<Calibration procedure> Perform zero adjustment and span adjustment in the determined order.
 Characteristics may be affected if not performed in the correct order.

46 / 71

7. Maintenance

7-4 Performing calibration<Zero gas>
 Zero gas is a test gas for calibrating the zero point. The ambient air can be used as the zero gas if there are
no interfering impurities or target gases present. For O2 and CO2 sensors, nitrogen (N2) is used.

<Calibration gases> Calibration gas is a gas for calibrating the sensitivity of the sensors during span adjustment. Calibration gas isa known concentration of the target gas diluted with clean air or nitrogen. For O2 sensors, the oxygen in theambient atmosphere is used, so a calibration gas is not required.
 We recommend calibrating the device using the detection target gas. This method is more accurate thanusing a replacement gas. Use of a replacement gas for calibration is permissible in circumstances when it is
not possible to use target gas calibration.
 It is necessary to calibrate for methane and hydrogen using only the actual gases. Do not use replacement
gases for calibration.
 It is necessary to perform span adjustment within 24 hours of the most recent valid zero adjustment.
 For managing the concentration of calibration gases, we recommend the use of a RIKEN KEIKI portabledetector.
 Contact RIKEN KEIKI.

WARNING If harmful calibration gas is inhaled, your health may be harmed and there is also the possibility of death.
 Do not inhale the calibration gas.

<Confirming response time (t90)>
 Checking is performed against the piping diagram.
 1. Confirm response time after air calibration and span adjustment.
 2. Select Maintenance mode 2-0.0 to enter the gas test.
 3. Use a stopwatch to measure the time it takes between when the calibration gas is introduced through thecalibration adapter and the reading reaching a gas concentration of 90 %.
 4. Compare the response time with the t90 value indicated on the corresponding sensor data sheet.
 Confirm that the required response time is being maintained.

<When using the splash guard>

WARNING Response
Gas response times can be affected when a splash guard is used. The gas response time increases andthis can increase the time until the alarm occurs.
In case of the splash guard is installed, the IRF is not included in the performance certification (it does notmeet the response).
 Adjustment
When adjusting highly adsorptive gases, replace with the adjustment adapter before performing theadjustments. Adjusting with a splash guard has an effect on the wind speed.
 The allowable range depends on the sensor, so refer to the table.

47 / 71

7. Maintenance

7-4-2

7-5 Setting environmental settings 1

Performing zero calibration

Please refer to the Technical Manual for SD-3series (PT2E-287).

7-4-3

Performing span adjustment

Please refer to the Technical Manual for SD-3series (PT2E-287).

7-5 Setting environmental settings 1
Please refer to the Technical Manual for SD-3series (PT2E-287).

7-6 Setting environmental settings 3
Please refer to the Technical Manual for SD-3series (PT2E-287).

48 / 71

7. Maintenance

7-7 Parts replacement

7-7 Parts replacement
7-7-1

Sensor replacement

Please contact Riken Keiki for sensor replacement.

<Sensor replacement intervals>
Gas
detectormodel
SD-3RI
SD-3DRI
GD-3RI

Sensormodel

ChemicalformulaDetection
concentration

Units

Sensorreplacement
interval

IRF-1301

MethaneCH4

100 %LEL%LEL

IRF-1317

Propane

C3H8

100 %LEL%LEL

IRF-1315

Propane

C3H8

100 vol%vol%

Detection target
gas

ChemicalformulaDetection
concentration

Units

Sensorreplacement
interval

MethaneCH4
100 %LEL%LEL

3 years

Hydrogen

H2

Detection
concentration

Units

Sensorreplacement
intervalGas
detectormodel

Sensormodel

SD-3NC
SD-3DNC
GD-3NC

NC-6318Gas
detectormodel
SD-3ECS
SD-3DECS
GD-3ECS
SD-3EC
SD-3DEC
GD-3EC

Detection target
gas

Chemicalformula

3 years

Sensormodel

Detection targetgas

ESF-A24R

Hydrogen sulfide

H2S

100 ppm

ppm

3 years

ESF-A24R3

Hydrogen sulfide

H2S

100 ppm

ppm

3 years

CAUTION Precautions regarding sensor replacement
 Be sure to turn OFF the power supplied to the sensor before replacing the sensor.
 Refer to ‘4-8 Mounting the sensor’ for instructions on how to mount the sensor.
 Perform air calibration and span adjustment after replacing the sensor.
 The sensor can be replaced in zones classified as hazardous without turning off the main unit power
supply.
 If the same type of sensor (the same part number) was previously installed, the particular configurationsof the device (detection target gas, measurement range, alarm setpoints, zero suppression, etc.) aremaintained. In other cases, the default factory settings of the new sensor are uploaded, overwriting thecurrent configurations. The sensor is recognized by the automatic sensor recognition function. Refer to‘6-5-2 Automatic sensor recognition function’ for information on the automatic sensor recognition function.

49 / 71

7. Maintenance

7-7 Parts replacement

 Use the "Sensor replacement" item from the sensor replacement function menu to replace the sensor
without triggering a fault signal on the main unit.

NOTE Please contact RIKEN KEIKI to request sensor replacement. Calibration using a calibration gas isrequired after sensor replacement.

7-7-2

Replacement of periodic replacement parts

The recommended replacement parts for this product are as follows: Replace using the recommended
replacement intervals as a guide.

<Recommended periodic replacement parts list>
Name
Sensor guardfor SD-3RI
Sensor guardfor SD-3NC
Sensor guardfor SD-3EC/ECS
Gas sensor

Recommended
check interval

Recommended
replacement interval

Quantity(per unit)

Remarks

3 - 8 years
6 months1
Refer to separate
sensor specifications.

*1*1: A functional check by a qualified service engineer is required after replacement. To ensure safety and the stable
operation of the product, request checking by a qualified service engineer. Contact RIKEN KEIKI to request
checking.

50 / 71

8. Storage, Relocation, and Disposal

8-1 Procedures for storage or when not in use for extended periods

8

Storage, Relocation, andDisposal
8-1 Procedures for storage or when not in use for extended
periods<Storage conditions (Sensor)>
Model

Storagelimit(years)－Temperature(°C)

Humidity*1(% RH)

Pressure(kPa)

Remarks

Minimum Maximum Minimum Maximum Minimum Maximum

NCF

0.5

-10

40

0

90

80

120

IRF

0.5

-10

40

0

90

80

120

ESF

0.5

-10

40

0

90

80

120

・ The sensor must be stored in the specified
packing case.
・ Store in a location away from direct
sunlight.
・ Store in an environment free of corrosive
gas, vibration, and dust.
・ Avoid condensation and moisture.
・ Store in an environment free of gases that
may act as a catalyst poison (e.g., silicone,chlorine, sulfur gases).
・ The sensor must be stored in the specified
packing case.
・ Store in a location away from direct
sunlight.
・ Store in an environment free of corrosive
gas, vibration, and dust.
・ Avoid condensation and moisture.
・ The sensor must be stored in the specified
packing case.
・ Store in a location away from direct
sunlight.
・ Store in an environment free of corrosive
gas, vibration, and dust.
・ Avoid condensation and moisture. ・ Storein an environment free of gases that may
act as a catalyst poison (e.g., silicone,chlorine, sulfur gases).

*1: Maximum humidity corresponds to an absolute humidity of 33 g/m3 (33.6 °C, 90 %RH).

51 / 71

8. Storage, Relocation, and Disposal

8-1 Procedures for storage or when not in use for extended periods<Storage conditions (Sensor-fitted SD-3)>
Storage

Model

limit
(years)－Temperature(°C)

Humidity*1(% RH)

Pressure(kPa)

Remarks

Minimum Maximum Minimum Maximum Minimum Maximum

NCF

0.5

-10

40

0

90

80

120

IRF

0.5

-10

40

0

90

80

120

ESF

0.5

-10

40

0

90

80

120

・ Store in a location away from direct
sunlight.
・ Store in an environment free ofcorrosive gas, vibration, and dust.
・ Avoid condensation and moisture.
・ Store in an environment free ofgases that may act as a catalyst
poison (e.g., silicone, chlorine, sulfur
gases).
・ Store in a location away from direct
sunlight.
・ Store in an environment free ofcorrosive gas, vibration, and dust.
・ Avoid condensation and moisture.
・ Store in a location away from direct
sunlight.
・ Store in an environment free ofcorrosive gas, vibration, and dust.
・ Avoid condensation and moisture.
・ Store in an environment free ofgases that may act as a catalyst
poison (e.g., silicone, chlorine, sulfur
gases).
・ Store in the dedicated sensor
storage container.*2 Open the
dedicated container just before use,
remove the sensor, and mount in
the detector.

*1: Maximum humidity corresponds to an absolute humidity of 33 g/m3 (33.6 °C, 90 %RH).
*2: If not stored in the container, fluid leakage may occur under high humidity conditions of 90 %RH or more.

52 / 71

8. Storage, Relocation, and Disposal

8-2 Procedures for relocation or reuse

8-2 Procedures for relocation or reuse
Please refer to the Technical Manual for SD-3series (PT2E-287).

8-3 Product disposal
Please refer to the Technical Manual for SD-3series (PT2E-287).

53 / 71

9. Troubleshooting

9-1 Product abnormalities

9

TroubleshootingThis troubleshooting section does not address causes of all problems that may occur with the product. It
provides brief explanations to assist in determining the causes of common problems.
If you encounter symptoms not addressed here or if problems persist even after taking corrective action, contact
RIKEN KEIKI.

9-1 Product abnormalities
Symptom/display

FAULT
lamp

The power cannot
be turned on.

―

Abnormaloperation

Cause

Action

The wires are incorrectly
connected.

Wire correctly.

The wires are detachedfrom the terminal plate.

Connect correctly.

Abnormalities or
instantaneousinterruptions in the power
supply circuit

Check to confirm that the rated voltage is
supplied.
Consider use of an uninterruptible power system,
power supply line filter, or insulated transformer,
and add such devices where appropriate.

Cable abnormality(Disconnection, cable notconnected, short circuit)

Check the wiring for the product and peripheraldevices.

Fuse blown

Replacement required. Contact Riken Keiki.

Internal circuit abnormality

Replacement required. Contact Riken Keiki.

Disturbances due tosudden noise, etc.

Turn off the power and restart. If similar
symptoms recur frequently, take appropriate
measures to address the noise source.
If the problem persists even with noise prevention
measures, contact Riken Keiki.

The sensor is notconnected or connected
improperly.

Turn off the power and check the sensor
connection.

A sensor fault has
occurred.

Replace with a new sensor.

Effects of sudden surge
noise

Turn off the power and restart. If similar
symptoms recur frequently, take appropriate
measures to address the noise source.
If the problem persists even with noise prevention
measures, contact Riken Keiki.

―

Sensorabnormality
(E-1)

(Lamp
on)

The main unit (SD-3/
Connect internal wiring of the main unit (SD-3/
SD-3SC) or remote sensor SD-3SC) or remote sensor head (GD-3) correctly.
head (GD-3) internal wiring
is connected incorrectly.

54 / 71

9. Troubleshooting

Symptom/display

9-2 Reading abnormalities

FAULT
lamp

Sensorabnormality
(E-1)
(Lamp
on)

Systemabnormality
(E-9)

(Lamp
on)

GD-3 abnormality(E-1A)

(Lamp
on)

Cause

ActionCable abnormality
between the main unit
(SD-3SC) and remotesensor head (GD-3)

Check the cable between the main unit (SD-3SC)
and remote sensor head (GD-3).

A main unit (SD-3/
SD-3SC) or remote sensor
head (GD-3) fuse has
blown.

Replacement required. Contact Riken Keiki.

Main unit (SD-3/SD-3SC)or remote sensor head
(GD-3) internal circuit
abnormality

Replacement required. Contact Riken Keiki.

4 - 20 mA output
disconnection

Turn off the power and check the 4 - 20 mA
output connection.

Internal ROM, RAM, or
EEPROM fault

Turn off the power and restart. If the problem
persists, replacement is necessary. Contact
Riken Keiki.

The sensor is notconnected or connected
improperly.

Turn off the power and check the sensor
connection.

A sensor fault has
occurred.

Replace with a new sensor.

Effects of sudden surge
noise

Turn off the power and restart. If similar
symptoms recur frequently, take appropriate
measures to address the noise source.
If the problem persists even with noise prevention
measures, contact Riken Keiki.

9-2 Reading abnormalities
Please refer to the Technical Manual for SD-3series (PT2E-287).

55 / 7110. Product Specifications

10-1 SD-3 specifications

10

Product Specifications
10-1 SD-3 specifications
10-1-1 SD-3 (model without EC barrier)ModelSpecifications
Display
Sensor
Detection principle
Detection target gas
Detection range
Sampling method
Set flow rate
Power supply
indication
External output
Alarm setpoints
Alarm accuracy
Alarm delay time
Repeatability (foridentical conditions)Indication accuracy(for identical conditions)
Gas alarm typeGas alarm
indication
Gas alarm reset
operation
Fault alarm/self
diagnosis
Fault alarmindication
Fault alarm reset
operation

Contact operation

Warnings
Warning display
Warning operation
FunctionsSD-3
Standard

SD-3 (contact model)
Contact
7-segment LED (5 digits)
F sensor (Riken Keiki)Infrared/electrochemical/new ceramic/semiconductor/hot-wire semiconductor
Depends on sensor specifications.
Depends on sensor specifications.
Diffusion type/suction type (introduced via external unit)
0.4 - 1.5 L/min
Power lamp lit (green)
Gas concentration signal (4 - 20 mA DC with HART output)
Depends on sensor specifications.
Depends on sensor specifications.
Depends on sensor specifications.
Depends on sensor specifications.
Depends on sensor specifications.
Two-step alarm (H-HH, H-L, or L-LL)
Alarm lamp lit (red)Auto reset or self-latching
System abnormality (E-9)/sensor abnormality (E-1)
Fault lamp lit (yellow)/error code display
System abnormality: Self-latching
Sensor abnormality: Auto reset (self-latching if sensor is disconnected)
SPDT (× 3):
2 alarms, 1 fault output
250 V AC, 2 A; 30 V DC, 1 A (resistance―load)
Minimum load 5 V DC, 0.1 A
Sensor life assessment/clock abnormality diagnosis/communication diagnosis/
sensor warning
Blinking display alternating between gas concentration and error code
Same as normal operation
Alarm delay/suppression/HART communication
56 / 7110. Product Specifications

Model
Transmission
method (4 - 20 mA)
Transmission
specifications(4 - 20 mA)
Transmission cable(4 - 20 mA)
Transmission
distance(4 - 20 mA)
Power source

Power supply cable
Power consumption
Cable connectors
Operation method
Operatingtemperature range
Operating humidity
range
Housing material
Protection level
Installation type
Explosion-proof
construction
Explosion-proof
class
External
dimensions
Weight10-1 SD-3 specifications

SD-3
SD-3 (contact model)
3-wire analog transmission (common power supply <power supply, signal,common>) or
2-wire analog transmission (current source)
4 mA - 20 mA DC (non-insulated linear output)
Maximum load resistance 600 Ω (with derating depending on power supply voltage)
Resolution: max. 250 divisions (depending on specifications)Shielded cable 1.25 sq (1.308 mm2/AWG16) or
2.0 sq (2.08 mm2/AWG14) (same as power supply cable)*To ensure explosion protection, use a cable designed for use in temperatures atleast 5 °C above the maximum anticipated ambient temperature.
For 1.25 sq (1.308 mm2/AWG16): Not exceeding 1.25 km
For 2.0 sq (2.08 mm2/AWG14): Not exceeding 2 km (with derating depending on
supply voltage)
24 V DC (18 V - 30 V DC)*Use a power supply capable of minimum temporary output of 2.5 A to ensure thatfuses blow normally in the event of a product abnormality.
Shielded cable 1.25 sq (1.308 mm2/AWG16) or
2.0 sq (2.08 mm2/AWG14) (same as transmission cable)*To ensure explosion protection, use a cable designed for use in temperatures atleast 5 °C above the maximum anticipated ambient temperature.
Refer to ‘10-1-3 Electrical ratings (SD-3)’.
M25 × 1.5
Dedicated magnet control key−40 °C - +70 °C (no sudden changes)
In accordance with sensor specifications if restrictions apply due to sensor
specifications
0 %RH - 95 %RH (no condensation)
In accordance with sensor specifications if restrictions apply due to sensor
specifications
Stainless steel (SCS14)**IP44/67 equivalent
Wall mounting (standard)/2B pole mounting (optional)
Flame-proof construction
Varies depending on model.
Refer to <Explosion-proof performance data> in ‘2-4 Safety information’.
Diffusion type: Approx. 171 mm (W) × 277 mm (H) × 127 mm (D) (excluding projections)Suction type: Approx. 171 mm (W) × 289 mm (H) × 127 mm (D) (excluding projections)Diffusion type: approx. 6.7 kg/Suction type: approx. 7.0 kg*When used with the contacts closed, the contacts may seize due to vibration. Keep this precaution in mind.
** In case of ANSI/FM 60079-29-1 is applied. IP44 when IRF and ESF-A24R is installed. IP67 when NCF and ESFA24R3 is installed.

57 / 7110. Product Specifications

10-1 SD-3 specifications

10-1-2 SD-3 (model with EC barrier)Please refer to the Technical Manual for SD-3series (PT2E-287).

10-1-3 Electrical ratings (SD-3)
Please refer to the Technical Manual for SD-3series (PT2E-287).

58 / 7110. Product Specifications

10-2 SD-3SC + GD-3 specifications

10-2 SD-3SC + GD-3 specifications
10-2-1 SD-3SC + GD-3 (model without EC barrier)ModelSpecifications
Display
Sensor
Detection principle
Detection target gas
Detection range
Sampling method
Power supply
indication
External output
Alarm setpoints
Alarm accuracy
Alarm delay time
Repeatability(for identicalconditions)Indication accuracy(for identicalconditions)
Gas alarm typeGas alarm indication
Gas alarm reset
operation
Fault alarm/self
diagnosis
Fault alarm indication
Fault alarm reset
operation
Contact operation

Warnings
Warning display
Warning operation
Functions
Transmission
method (4 - 20 mA)
Transmission
specifications(4 - 20 mA)

SD-3SC (contact model)+ GD-3Standard
Contact
7-segment LED (5 digits)
F sensor (Riken Keiki)Infrared/electrochemical/new ceramic/semiconductor/hot-wire semiconductor
Depends on sensor specifications.
Depends on sensor specifications.
Diffusion type
SD-3SC + GD-3

Power lamp lit (green)
Gas concentration signal (4 - 20 mA DC with HART output)
Depends on sensor specifications.
Depends on sensor specifications.
Depends on sensor specifications.
Depends on sensor specifications.

Depends on sensor specifications.
Two-step alarm (H-HH, H-L, or L-LL)
Alarm lamp lit (red)Auto reset or self-latching
System abnormality (E-9)/sensor abnormality (E-1)
Fault lamp lit (yellow)/error code display
System abnormality: Self-latching
Sensor abnormality: Auto reset (self-latching if sensor is disconnected)
SPDT (× 3):
2 alarms, 1 fault output―
250 V AC, 2A; 30 V DC, 1 A (resistance load)
Minimum load 5 V DC, 0.1 A
Sensor life assessment/clock abnormality diagnosis/communication diagnosis/
sensor warning
Blinking display alternating between gas concentration and error code
Same as normal operation
Alarm delay/suppression/HART communication
3-wire analog transmission (common power supply <power supply, signal,common>) or
2-wire analog transmission (current source)
4 mA - 20 mA DC (non-insulated linear output)
Maximum load resistance 600 Ω (with derating depending on power supply voltage)
Resolution: max. 250 divisions (depending on specifications)

59 / 7110. Product Specifications

Model
Transmission cable(4 - 20 mA)
Transmission
distance (4 - 20 mA)
Transmission cable(between GD-3 units)10-2 SD-3SC + GD-3 specifications

SD-3SC (contact model)+ GD-3
2
Shielded cable 1.25 sq (1.308 mm /AWG16) or
2.0 sq (2.08 mm2/AWG14) (same as power supply cable)*To ensure explosion protection, use a cable designed for use in temperatures atleast 5 °C above the maximum anticipated ambient temperature.
SD-3SC + GD-3

For 1.25 sq (1.308 mm2/AWG16): Not exceeding 1.25 km
For 2.0 sq (2.08 mm2/AWG14): Not exceeding 2 km (with derating depending on
supply voltage)
Shielded twisted pair cable 1.25 sq (1.308 mm2/AWG16)*To ensure explosion protection, use a cable designed for use in temperatures atleast 5 °C above the maximum anticipated ambient temperature.

Transmission
distance (between
GD-3 units)

20 m (maximum)

Power source

24 V DC (18 V - 30 V DC)*Use a power supply capable of minimum temporary output of 2.5 A to ensure thatfuses blow normally in the event of a product abnormality.

Power supply cable

Shielded cable 1.25 sq (1.308 mm2/AWG16) or
2.0 sq (2.08 mm2/AWG14) (same as transmission cable)*To ensure explosion protection, use a cable designed for use in temperatures atleast 5 °C above the maximum anticipated ambient temperature.

Power consumption
Cable connectors
Operation method
Operatingtemperature range
Operating humidity
range
Housing material
Protection level
Installation type
Explosion-proof
construction
Explosion-proof class
External dimensions(SD-3SC)
Weight (SD-3SC)
External dimensions(GD-3)
Weight (GD-3)

Refer to ‘10-2-3 Electrical ratings (SD-3SC + GD-3)’.
M25 × 1.5
Dedicated magnet control key−40 °C - +70 °C (no sudden changes)
In accordance with sensor specifications if restrictions apply due to sensor
specifications
0 %RH - 95 %RH (no condensation)
In accordance with sensor specifications if restrictions apply due to sensor
specifications
Stainless steel (SCS14)**IP44/67 equivalent
Wall mounting (standard)/2B pole mounting (optional)
Flame-proof construction
Varies depending on model.
Refer to <Explosion-proof performance data> in ‘2-4 Safety information’.
Diffusion type: Approx. 125 mm (W) × 195 mm (H) × 88 mm (D) (excluding projections)
Approx. 6.0 kg
Approx. 125 mm (W) × 195 mm (H) × 88 mm (D)Approx. 3.0 kg*When used with the contacts closed, the contacts may seize due to vibration. Keep this precaution in mind.
** In case of ANSI/FM 60079-29-1 is applied. IP44 when IRF and ESF-A24R is installed. IP67 when NCF and ESFA24R3 is installed.

60 / 7110. Product Specifications

10-2 SD-3SC + GD-3 specifications

10-2-2 SD-3SC + GD-3 (model with EC barrier)Please refer to the Technical Manual for SD-3series (PT2E-287).

10-2-3 Electrical ratings (SD-3SC + GD-3)
Please refer to the Technical Manual for SD-3series (PT2E-287).

61 / 7110. Product Specifications

10-3 Detection target gases for individual detection principles

10-3 Detection target gases for individual detection principles
10-3-1 Non-dispersive infrared absorption type (Infrared type)
Sensor modelIRF-1301*

Gas nameGassymbolFirst

SecondF.S.

1 digitAlarm
setpointAlarm
setpoint

CH4

100 %LEL

0.5 %LEL

25 %LEL

50 %LEL

MethaneIRF-1317*

Propane

C3H8

100 %LEL

0.5 %LEL

25 %LEL

50 %LEL

IRF-1315

Propane

C3H8

100 vol%

0.5 vol%

25 %vol%

50 vol%Calibration
gas

Operatingtemperature
range

Operatinghumidity
range

Years ofwarranty

CH4
C3H8
i-C4H10−40 °C 70 °C

95 %RH or
less(no conden-

3 yearssation)C3H8*Interference occurs due to other hydrocarbon gases.

NOTE When calibrating, allow the product to warm up for at least 10 minutes before performing zero calibrationand span adjustment.
 Use the IRF sensor adapter when calibrating. Calibration accuracy may be impaired without the IRF
sensor adapter.

10-3-2 New ceramic type
Sensor model Gas name

NCF-6318

NCF-6318

MethaneHydrogenGas
symbol

CH4

H2

F.S.

100 %LEL

100 %LEL

1 digit

0.5 %LEL

0.5 %LEL

First

Second

Alarm

Alarm

setpoint

setpoint

25 %LEL

50 %LEL

25 %LEL

Calibration

50 %LEL* Absolute humidity not exceeding 46 g/m3 (equivalent to 37 °C, 95 %RH)

10-3-3 Semiconductor type
Please refer to the Technical Manual for SD-3series (PT2E-287).

10-3-4 Hot-wire semiconductor type
Please refer to the Technical Manual for SD-3series (PT2E-287).

62 / 71

gas

CH4

H2

OperatingOperatingtemperaturehumidity

range

range

−40 °C 70 °C

Years ofwarranty

0 %RH 95 %RH*1 (nocondensation)

3 years

10. Product Specifications

10-3 Detection target gases for individual detection principles

10-3-5 Electrochemical type
Sensor model

ESF-A24R

ESF-A24R3

Gas name

HydrogensulfideHydrogensulfideGas
symbol

H2S

F.S.

100 ppm

1 digit

1 ppm

First

Second

Alarm

Alarm

setpoint

setpoint

20 ppm40 ppmCalibration
gas

H2S

OperatingOperatingtemperaturehumidity

range

range

-40 to 70 °C*1

95 %RHor less

Years ofwarranty

3 years(no condensation)

H2S

100 ppm

1 ppm

20 ppm40 ppmH2S-40 to 70 °C*1

95 %RHor less

3 years(no condensation)*1 Allow the product to fully adjust to the usage conditions before adjusting if below −25 °C.

NOTE Perform maintenance if a warning appears while the life assessment or self-diagnostic function is active.
 Use the ESF sensor adapter when calibrating. Calibration accuracy may be reduced without the ESF
sensor adapter.
 Use a flow rate of 0.5 ± 0.1 L/min when calibrating. Calibration accuracy may be reduced if calibration is
performed using a different flow rate.
 When using a diffusion type detector, gas sensitivity will be affected by ambient wind speeds.

63 / 7111. Appendix

11-1 Detection principle

11

Appendix11-1 Detection principle
Please refer to the Technical Manual for SD-3series (PT2E-287).

64 / 7111. Appendix

11-2 Sensor Specifications

11-2 Sensor Specifications
11-2-1 IR sensor specification
Gas detector model

SD-3RI/SD-3DRI/GD-3RI

Sensor modelIRF-1301

IRF-1317

IRF-1315

Parts No.

620102620202620402

Measuring principle
Detection target gas

Non-dispersive infrared absorption method (infrared type)
Methane (CH 4)

Propane (C3H8)

Propane (C3H8)

100 %LEL

100 %LEL

100 vol%

Units

%LEL

%LEL

vol%

Digit

0.5%LEL

0.5%LEL

0.5vol%LEL value to apply(BS EN ISO 80079-20-1:2019)

4.4vol%1.7vol%―Maximum detection concentration

Operating temperature range-40 to +70 °C (no sudden fluctuations)
Accuracy: -20 to 60 °C (equivalent to EN 60079-29-1:2016)

Operatinghumidity range

Up to 95 %RH (no condensation)

Operating pressure range

80 - 120 kPa (no sudden changes in pressure, explosion proof is guaranteed at 80kPa~110kPa)

Operating wind speed range

0 - 6m/s (equivalent to EN 60079-29-1:2016)

Orientation*1

Body (SD-3) + Sensor : within ± 90 ° from the normal position
Remote sensor head (GD-3) + Sensor : No limit

Sample flow rate range

0.4 - 1.5 L/min

Warmup time
Calibration gas

EN setting: 60 seconds
Methane 1.98〜2.42 vol%Propane 0.77〜0.94 vol%Propane 72.0〜88.0 vol%Calibration jig flow rate

0.5 ± 0.1 L/min

Calibration time

120 seconds

Response(T90)

without splash guard : within 60 seconds (equivalent to EN 60079-29-1: 2016,)
Different gases: C2H4,1,3-C4H6

Remarks

Different gases: i-C4H10, i-C4H8

Different gases: i-C4H10, i-C4H8

The reading may fluctuate due to temperature, humidity, and pressure characteristics and in some cases may exceed thezero suppression level.
*1 The main body and remote sensor head have no directional restrictions. However, there may be restrictions when
optional items (protective cover, etc.) are attached. The splash guard itself has no directional restrictions. A note will be
added to the installation guide of the instruction manual.

65 / 7111. Appendix

11-2 Sensor Specifications

11-2-2 Combustible gas sensor specification
Gas detector model

SD-3NC/SD-3DNC/GD-3NC

Sensor model
Parts No.

NCF-6318
600019600050Measuring principle
Detection target gas

New ceramic type
Methane (CH 4)

HydrogenMaximum detection

100 %LEL

concentration
Units

%LEL

Digit

0.5%LELLEL value to apply(BS EN ISO 80079-20-1:2019)
Operating temperature range

600003

4.4vol%4.0vol%-40 to +70 °C (no sudden fluctuations)
Accuracy: -20 to 60 °C (equivalent to EN 60079-29-1:2016)

Operating humidity range

Up to 95 %RH (no condensation)*1

Operating pressure range

80 - 120 kPa (no sudden changes in pressure, explosion proof is guaranteed at 80kPa~110kPa)

Operating wind speed range※1 Orientation

0 - 6m/s (equivalent to EN 60079-29-1:2016)
Body (SD-3) + Sensor : within ± 90 ° from the normal position
Remote sensor head (GD-3) + Sensor : No limit

Sample flow rate range

0.4 - 1.5 L/min

Warmup time
Calibration gas

EN setting: 60 seconds
Methane 1.98〜2.42 vol%Hydorogen1.80〜2.2 vol%Calibration jig flow rate

0.5 ± 0.1 L/min

Calibration time

60 seconds

Response(T90)within 60 seconds (equivalent to EN 60079-29-1: 2016,)
Different gases: i-C4H10,C2H4

Remarks

Different gases: H2*1 The main body and remote sensor head have no directional restrictions. However, there may be restrictions when
optional items (protective cover, etc.) are attached. The splash guard itself has no directional restrictions. A note will be
added to the installation guide of the instruction manual.

66 / 7111. Appendix

11-2 Sensor Specifications

11-2-3 EC sensor specification
Gas detector modelSensor model
Parts No.

SD-3ECS/SD-3DECS/GD-3ECS

SD-3EC/SD-3DEC/GD-3EC

ESF-A24R(equivalent to ANSI92.00.01)

ESF-A24R3(equivalent to ANSI92.00.01)

610004610049Measuring principle

Electrochemical

Detection target gas

Hydrogen sulfide(H2S)

Maximum detection
concentration

100 ppm

Units

ppm

Digit

1 ppm

LEL value to apply(BS EN ISO
80079-20-1:2019)―

Operating temperature
range-40 to +70 °C (no sudden fluctuations)Operatinghumidity range

95% RH or less
(No condensation, Conditions to meet performance requirements︓5%RH〜95%RH)

Operating pressure range

80 - 120 kPa (no sudden changes in pressure, explosion proof is guaranteed at 80kPa~110kPa)

Operating wind speed range

0 - 6m/s

Orientation*1

Body (SD-3) + Sensor : within ± 90 ° from the normal position
Remote sensor head (GD-3) + Sensor : No limit

Sample flow rate range

0.4 - 1.5 L/min

Warmup time

EN setting: 30 seconds

Calibration gas

Hydrogen sulfide 30.4~33.6ppm

Calibration jig flow rate

0.5 ± 0.1 L/min

Calibration time

60 seconds

Response(T90)

without splash guard : within 150 seconds±10% of reading

Accuracy/repeatability

Remarks

The reading may fluctuate due to temperature, humidity, and pressure characteristics and in some cases may
exceed the zero suppression level.
*1 The main body and remote sensor head have no directional restrictions. However, theremay be restrictions
when optional items (protective cover, etc.) are attached. The splash guarditself has no directional restrictions. A
note will be added to the installation guide of the instruction manual.

67 / 7111. Appendix

11-3 Calibration curve

11-3 Calibration curve

11-3-1 IRF sensor
Calibration curve for infrared gas detector (Typical Value)
IRF-1301

IRF-1317
gas concentration [ ％ＬＥＬ ]

100

80
70

1,3-C4H6

60
50
40
30

C2H4

20

C3H8 gas concentration [%LEL]

90

Ｃ３Ｈ８

ＣＨ４

CH4 gas concentration [%LEL]

gas concentration [ ％ＬＥＬ ]

100

10
0
0

10

20

30

40

50

60

70

80

90

C3H8gasgasconcentration
concentration[vol%][ ＶＯＬ％ ]
Ｃ３Ｈ８

90
80

i-C4H860
50

i-C4H10

30
20
10
0
20

30

40

50

60

70

80

50
40
30

i-C4H8

20
10

10

20

30

40

50

60

70

80

Gas concentration [%LEL]

100

10

i-C4H1060

gas concentration [ ％ＬＥＬ ]IRF-1315070

0Gas concentration [%LEL]

40

80

0

100

gas concentration [ ％ＬＥＬ ]

70

90

90

100

gas concentration [ ＶＯＬ％ ]Gas concentration [vol%]68 / 7190

100

11. Appendix

11-4 Terminology

11-3-2 NCF sensor
Calibration curve for Combustible gas detector (Typical Value)NCF-6318
0.0

0.2

0.4

0.6

0.8

1.0

1.2

[vol%]

0.0

100

0.5

1.0

1.5

2.0

[vol%]

100
4.0

4.0

3.5

Methane［％LEL］

Methane［％LEL］

80

3.0
60

2.5
2.0

40

1.5
1.0

20

80

3.5
3.0

60

2.5
2.0

40

1.5
1.0

20

0.5
0

0.5

0.0
0

20

40

60

80

0

100

Isobutane [％LEL]

0.0

1.0

2.0

3.0

4.0 [vol%]Methane［％LEL］

4.0
80

3.5
3.0

60

2.5
2.0

40

1.5
1.0

20

0.5
0

0.0
20

40

60

20

40

60

Ethylene [％LEL]

100

0

0.0
0

80

100

Hydrogen [％LEL]

11-4 Terminology
Please refer to the Technical Manual for SD-3series (PT2E-287).

69 / 71

80

100

11. Appendix

Product warranty

Product warranty
Please refer to the Technical Manual for SD-3series (PT2E-287).

Sensor warranty
Please refer to the Technical Manual for SD-3series (PT2E-287).

70 / 7111. Appendix

Revision History

Revision History
Issue

Revision details

Issue date

0First issue

6/15/2023

1

ATEx / IECEx Certification *6 delete

6/22/2023

2

Update Calibration curve

6/26/2023

3

Update EC sensor specification & General installation information

7/11/2023

4

Change of temperature and humidity range for ESF sensor
Change of part number for optional accessory adapters

71 / 71

12/18/2023