PC2E-0371

Featuring the next-generation high-performance F Sensors
to meet a wide range of global standards 

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ATEX certified (ATEX: European directive for equipment for potentiallyexplosive atmospheres)
IECEx certified (IEC explosion-proof electrical equipment standard test)
Japan Ex certified (certificate of conformity for electrical equipment used in
potentially explosive atmospheres)
Functional safety standard certified

The SD-3 Series of fixed explosion-proof gas detectors detect combustible gas and toxic gas leaks andcontinuously monitor oxygen levels in the surrounding atmosphere.
These global products are certified explosion-proof in various countries (some scheduled) and meet therequirements of various international standards, including IEC/EN performance and SIL 2 certification.
<Connector 3> Not used

<Connector 2><Connector 4>• Power supply/signal cables• Lightning arrester (TP-48)*• Power supply/signal cables• Lightning arrester (TP-48)** Japan Ex not supported* Japan Ex not supported

1

Featuring thenext-generation
high-performance
F Sensors2<Connector 1><Connector 5>• Contact output cable• RS-485 communicationcable• HART modem connector(Cannot be used in
explosion-proof areas)

3<Remote type>4

7-segment LED and lamps(green/red/yellow)
Displays gas concentration, status,and command selection menus.

<Connector 6>• Sensor connector<Connector 6>• Sensor• Remote sensor head connector cable

5- Compatible with a wide
range of toxic gases- Double range capability

Wide range of
output options

Suitable for a variety
of uses and installation
environments

Complies withwide range ofglobal standards

Rugged housing

Features1

Incorporates the next-generation high-performance F sensors for dramatically improved
functionality and performance• 3-year sensor warranty* Specific sensors excluded. Assumes the sensor is inspected at least once a year.

• Operating temperature range: -40 - +70 °C* Specific sensors excluded• Sensor degradation and life assessment function
The degradation and life assessment function notifies theuser with a warning when the sensor needs to be replaced.

• IEC/EN performance compliance scheduled* Specific sensors excluded[Sensor degradation assessment]
The individual sensor principle characteristics are used to automatically diagnose sensor
degradation (e.g., reduced zero point output and low electrolyte levels).

Warning[Life assessment]
Diagnoses sensor life during calibration by predicting the sensor output reserve value basedon past calibration history.
* The sensor degradation and life assessment warning is output as a digital signal (HART or RS-485 communication).

Compatible with a wide range of toxic gases

Double range capability(NC type)

Devices in the SD-3EC Series lineup feature an intrinsicallysafe explosion-proof barrier integral construction (Flame-proof
enclosure + intrinsically safe explosion-proof construction).
This eliminates the need for sintered metal in the sensor andallows detection of a wide range of highly adsorptive toxic
gases.
* Compatible models: SD-3ECB, SD-3DECB, GD-3ECB
For more information, refer to the F sensor list (with barrier).

2Intrinsically safe explosion-proof barrier

Double ranges in the form of
low concentration (ppm) andlower explosive limit (LEL) canbe detected with a single device.
This allows measurement of awide range of concentrations withgreater accuracy.
* Not compatible with HART communication* Not SIL compliant

MODEL SD-3 SERIES

2

Wide range of output options
The SD-3 Series also supports Modbus (RS-485) communication in addition to 4 - 20 mA output with HART (support planned).
Three relay contacts are also available (ALARM1, ALARM2, and FAULT). Select any of the following three types to suit specificuses:① 4 - 20 mA signal with HART communication [standard]② 4 - 20 mA signal with HART communication + contact (3c) [optional]③ 4 - 20 mA signal + Modbus (RS-485) communication [optional; future support planned]

3Wide range of types to suit a variety of uses and installation environments
The SD-3 Series lineup includes diffusion type, suction type, remote type, and duct insertion type models. Select the optimal
detection method to suit specific uses. Using a suction type model in conjunction with an external pump allows use in limited
installation space and high places where maintenance work is not possible.

[Remote type/Duct insertion type]Use a remote sensor to allow sensor installation up to 20 m from the detector main unit. An optional duct mount kit (soldseparately) can be used for insertion inside a duct.

[Diffusion type] [Suction type][Remote type][Duct insertion type]
Calibration gas inlet

Splash guard(sensor)4Complies with wide range of global standards
Explosion-proof
certifications indifferent countries

ATEX/IECEx, Japan Ex (Japan), FM/cFM*

Performance

IEC/EN performance compliance*
Combustible gas: IEC/EN 60079-29-1

Miscellaneous

CE marking (ATEX Directive, EMC Directive, RoHS Directive), SIL2 Certification (IEC 61508),
MED Certification*, HART communication

Toxic gas: EN 45544-2

Oxygen: EN 50104* Pending or due to be certified

5

Rugged housing construction allows use evenin harsh environments• Housing material: SCS14 stainless steel (equivalent to
SUS316)• Protection rating: Equivalent to IP66/67• Wide range of operating temperatures (-40 - +70 °C)* -20 - +70 °C for Japan Ex• Extensive range of optional accessories: protective cover,splash guard, lightning arrester (Japan Ex not supported),
various filters, etc.
With sunshade fitted

With splash guard fitted3Detection principles and detection target gases by model
The SD-3 Series consists of the following models, which vary by sampling method and detection principle. Please select the appropriate
model for the intended use.

[List of detection target gases by model]
Detection target gas

Sampling
methodModel
SD-3RI

Diffusion typeSD-3DRI

Suction type

SD-3NC

Diffusion typeSD-3DNC

Suction typeSD-3GH

Diffusion typeSD-3DGH

Suction typeSD-3GHS

Diffusion typeSD-3DGHS

Suction type

SD-3SP

Diffusion typeSD-3DSP

Suction type

SD-3EC

Diffusion type

Detection principle

Combustible
Oxygengas

IRF: N on-dispersive infrared type〇

NCF: New ceramic type(catalytic type)

〇

Toxic
gas
〇

Suction type

SD-3ECS

Diffusion typeSD-3DECS

Suction type

SD-3ECB

Diffusion typeSD-3DECB

Suction type

Remarks

Red

Red

〇

〇

Yellow〇

Yellow〇Blue〇

Yellow/silver

Toxic gas: Y ellow certification
plate
Oxygen: S
 ilver certification
plate

〇

Yellow

H2S (hydrogen sulfide) only〇

Yellow

With EC barrier*

SGF: Semiconductor type

SHF: Hot-wire semiconductor
type

〇

〇
SD-3DEC

Nameplatecolor

ESF: Electrochemical type

CS2 (carbon disulfide) only

* Differs depending on detection target gas. For more information, refer to the F sensor list on the following page.

[List of detection target gases by model (remote type)]
Model(Main unit)

SD-3SC

Main unit model(Remote sensor unit)

Detection target gas

Sampling
methodDetection principle

Combustible
gas

GD-3RI

IRF: Non-dispersive infrared type〇

GD-3NCNCF: New ceramic type(catalytic type)〇

Oxygen

Toxic
gas
〇

Nameplatecolor

Remarks

Red
Red

〇

Yellow〇

Yellow〇Blue〇

Yellow/silver

Toxic gas: Y ellow
certification plate
Oxygen: S
 ilver certification
plate

GD-3ECS〇

Yellow

H2S (hydrogen sulfide) only

GD-3ECB〇

Yellow

With EC barrier*

GD-3GH

SGF: Semiconductor type

GD-3GHS
GD-3SP

Diffusion type

SHF: Hot-wire semiconductor type〇〇〇

GD-3EC
ESF: Electrochemical type

CS2 (carbon disulfide) only

* Differs depending on detection target gas. For more information, refer to the F sensor list on the following page.

Certification plate: Red

4

Certification plate: Blue

Certification plate: Yellow

Certification plate: Silver

MODEL SD-3 SERIESF sensor list
Detection
principle

IRF

NCF

SGF

SHF

ESF

CH4

Operatingtemperature range(no sudden changes)-40 °C - 70 °C

Operatinghumidity range(no condensation)
95 %RH or less

0.5 %LEL

i-C4H10-40 °C - 70 °C

0.5 %LEL

C3H8(i-C4H10)-40 °C - 70 °C

2,000 ppm

1 ppm

CO2

CO2

5,000 ppm

10 ppmCarbon dioxideCO210,000 ppm

IRF-1437

Carbon dioxide

CO26205 13

IRF-1438

Carbon dioxide

6205 14

IRF-1439

6201 03

Product
No.

Sensor modelGas name

ChemicalformulaF.S.

1 digitCalibration gas(replacement gas)6201 02

IRF-1301

MethaneCH4

100 %LEL

0.5 %LEL

6212 03

IRF-1303

Isobutane

C4H10

100 %LEL

6212 02

IRF-1317

Propane

C3H8

100 %LEL

6205 02

IRF-1435

Carbon dioxide

CO26205 03

IRF-1436

Carbon dioxide

6205 04

IRF-1433

6205 12With/
Functional safety
without barrier
IEC 61508

Remarks–〇

95 %RH or less–〇

95 %RH or less–〇

-40 °C - 70 °C

95 %RH or less

–

〇

CO2

-40 °C - 70 °C

95 %RH or less–〇

10 ppmCO2-40 °C - 70 °C

95 %RH or less–〇2 vol%

0.005 vol%CO2

-40 °C - 70 °C

95 %RH or less

–

〇

CO2

5 vol%

0.01 vol%CO2-40 °C - 70 °C

95 %RH or less–〇

Carbon dioxide

CO2

10 vol%0.01 vol%CO2-40 °C - 70 °C

95 %RH or less–〇IRF-1334

MethaneCH4

100 vol%

0.5 vol%CH4-40 °C - 70 °C

95 %RH or less–

6201 04

IRF-1316

Ethylene

C2H4

100 %LEL

0.5 %LEL

C2H4(CH4)-40 °C - 70 °C

95 %RH or less–〇–6213 02

IRF-1340

Isobutylene

C4H8

100 %LEL

0.5 %LEL

i-C4H8(i-C4H10)-40 °C - 70 °C

95 %RH or less–6212 04

IRF-1308

N-hexane

C6H14

100 %LEL

0.5 %LEL

n-C6H14(i-C4H10)-40 °C - 70 °C

95 %RH or less–

6201 05

IRF-1332

Butadiene

C4H6

100 %LEL

0.5 %LEL

C4H6(CH4)-40 °C - 70 °C

95 %RH or less––6000 07

NCF-6318

EthaneC2H6

100 %LEL

0.5 %LEL

C2H6(CH4)-40 °C - 70 °C

95 %RH or less–〇6000 14

NCF-6318

Propane

C3H8

100 %LEL

0.5 %LEL

C3H8(CH4)-40 °C - 70 °C

95 %RH or less–〇6000 19

NCF-6318

MethaneCH4

100 %LEL

0.5 %LEL

CH4-40 °C - 70 °C

95 %RH or less–6000 20

NCF-6318

MethaneCH4

2 vol%

0.01 vol%CH4-40 °C - 70 °C

95 %RH or less–〇–6000 21

NCF-6318

MethaneCH4

20,000 ppm

100 ppm

CH4-40 °C - 70 °C

95 %RH or less––6000 45

NCF-6320

HydrogenH2

100 %LEL

0.5 %LEL

H2-40 °C - 70 °C

95 %RH or less–Hydrogen selective

6000 23

NCF-6320

HydrogenH2

2 vol%

0.01 vol%H2-40 °C - 70 °C

95 %RH or less–〇–6000 24

NCF-6320

HydrogenH2

2,000 ppm

10 ppmH2-40 °C - 70 °C

95 %RH or less––Hydrogen selective

6000 25

NCF-6319

Isobutane

C4H10

100 %LEL

0.5 %LEL

i-C4H10-40 °C - 70 °C

95 %RH or less–6000 26

NCF-6319

HydrogenH2

2 vol%

0.01 vol%H2-40 °C - 70 °C

95 %RH or less–〇–6000 27

NCF-6319

HydrogenH2

100 %LEL

0.5 %LEL

H2-40 °C - 70 °C

95 %RH or less–6000 28

NCF-6319

N-hexane

C6H142,000 ppm

10 ppmn-C6H14(i-C4H10)-40 °C - 70 °C

95 %RH or less–6000 29

NCF-6319

HydrogenH2

1 vol%

0.01 vol%H2-40 °C - 70 °C

95 %RH or less––6000 30

NCF-6319

Isopropyl alcohol

C3H8O

100 %LEL

0.5 %LEL

IPA(i-C4H10)-40 °C - 70 °C

95 %RH or less–〇6000 31

NCF-6319

Toluene

C7H8

100 %LEL

0.5 %LEL

C7H8(i-C4H10)-40 °C - 70 °C

95 %RH or less–〇6000 32

NCF-6319

Acetone

C3H6O

100 %LEL

0.5 %LELC3H6O(i-C4H10)-40 °C - 70 °C

95 %RH or less–〇6000 33

NCF-6319

HydrogenH2

4 vol%

0.02 vol%H2-40 °C - 70 °C

95 %RH or less–6000 34

NCF-6319

N,N-dimethylacetamide

C4H9NO

4,000 ppm

20 ppmDMAC(i-C4H10)-40 °C - 70 °C

95 %RH or less–〇–6000 35

NCF-6319

Acetylene

C2H2

100 %LEL

0.5 %LEL

C2H2(i-C4H10)-40 °C - 70 °C

95 %RH or less–〇6000 36

NCF-6319

Ethylene

C2H4

100 %LEL

0.5 %LEL

C2H4(i-C4H10)-40 °C - 70 °C

95 %RH or less–6000 37

NCF-6319

Normal octane

C8H18

100 %LEL

0.5 %LEL

C8H18(i-C4H10)-40 °C - 70 °C

95 %RH or less–〇–6000 38

NCF-6319

Ethyl alcohol

C2H6O

100 %LEL

0.5 %LELC2H5OH(i-C4H10)-40 °C - 70 °C

95 %RH or less–〇6000 39

NCF-6319

Methyl alcohol

CH4O

100 %LEL

0.5 %LEL

CH3OH(i-C4H10)-40 °C - 70 °C

95 %RH or less–〇6000 40

NCF-6319

Propylene

C3H6

100 %LEL

0.5 %LEL

C3H6(i-C4H10)-40 °C - 70 °C

95 %RH or less–〇6000 41

NCF-6319

Vinyl chloride

C2H3CL

100 %LEL

0.5 %LEL

VCM(i-C4H10)-40 °C - 70 °C

95 %RH or less–〇6000 48

NCF-6319

Isobutylene

i-C4H8

100 %LEL

0.5 %LEL

i-C4H8(i-C4H10)-40 °C - 70 °C

95 %RH or less–〇6000 49

NCF-6319

Butadiene

C4H6

100 %LEL

0.5 %LEL

C4H6(i-C4H10)-40 °C - 70 °C

95 %RH or less–6030 04

SGF-8562

Carbonyl sulfide

COS

2,000 ppm

10 ppmCOS(C2H5OH)-20 °C - 65 °C

20 - 95 %RH–〇–6030 05

SGF-8562

Carbon disulfide

CS2

200 ppm

1 ppm

CS2

-20 °C - 65 °C

20 - 95 %RH––6030 06

SGF-8563

Ethylene oxide

C2H4O

100 ppm

1 ppm

EO-20 °C - 65 °C

20 - 95 %RH––6030 07

SGF-8562

Hydrogen sulfide

H2S

100 ppm

1 ppm

H2 S

-20 °C - 65 °C

20 - 95 %RH––6060 01

SHF-8601

MethaneCH45,000 ppm

25 ppmCH4−30 °C - 70 °C

20 - 95 %RH––6060 02

SHF-8601

Isobutane

C4H10

2,000 ppm

10 ppmi-C4H10−30 °C - 70 °C

20 - 95 %RH––6060 04

SHF-8601

Ethylene

C2H42,000 ppm

10 ppmC2H4−30 °C - 70 °C

20 - 95 %RH––6060 05

SHF-8601

Acetylene

C2H22,000 ppm

10 ppmC2H2−30 °C - 70 °C

20 - 95 %RH––6060 06

SHF-8601

Propylene

C3H62,000 ppm

10 ppmC3H6−30 °C - 70 °C

20 - 95 %RH––6060 07

SHF-8601

N-hexane

C6H14

200 ppm

1 ppm

n-C6H14−30 °C - 70 °C

20 - 95 %RH––6060 08

SHF-8601

OctaneC8H182,000 ppm

10 ppm

C8H18−30 °C - 70 °C

20 - 95 %RH––6060 09

SHF-8601

Fluoromethane

CH3F

2,000 ppm

10 ppmR-41−30 °C - 70 °C

20 - 95 %RH––6060 10

SHF-8601

Difluoromethane

CH2F2

2,000 ppm

10 ppmR-32−30 °C - 70 °C

20 - 95 %RH––6060 11

SHF-8601

Difluoromethane

CH2F2

5,000 ppm

25 ppmR-32−30 °C - 70 °C

20 - 95 %RH––6060 12

SHF-8601

Isopropyl alcohol

C3H8O

2,000 ppm

10 ppmIPA−30 °C - 70 °C

20 - 95 %RH––6060 13

SHF-8601

Hexafluoro-1,3-butadiene

C4F62,000 ppm

10 ppm

C4F6(i-C4H10)−30 °C - 70 °C

20 - 95 %RH––6060 14

SHF-8601

1,2-dichloroethylene

C2H2CL2

600 ppm

5 ppm

C2H2CL2−30 °C - 70 °C

20 - 95 %RH––6060 18

SHF-8601

Carbon monoxideCO1,000 ppm

10 ppmCO

0 °C - 70 °C

20 - 95 %RH––6060 15

SHF-8603

HydrogenH2

500 ppm

5 ppm

H2−30 °C - 70 °C

20 - 95 %RH––

Hydrogen selective

6060 16

SHF-8603

Hydrogen

H2

1,000 ppm

10 ppmH2−30 °C - 70 °C

20 - 95 %RH––

Hydrogen selective

6060 03

SHF-8603

HydrogenH2

2,000 ppm

10 ppmH2−30 °C - 70 °C

20 - 95 %RH––

Hydrogen selective

6060 17

SHF-8603

Deuterium

D2

2,000 ppm

10 ppmD2(H2)−30 °C - 70 °C

20 - 95 %RH––

6100 28

ESF-A24RH

Hydrogen sulfide

H2S

30 ppm0.2 ppm

H2 S-40 °C - 70 °C

40 - 95 %RH

Without barrier–

6100 04

ESF-A24R

Hydrogen sulfide

H2S

100 ppm

1 ppm

H2 S

-40 °C - 70 °C

20 - 90 %RH

Without barrier

6100 06

ESF-A24A

Nitrogen dioxide

NO2

15 ppm0.1 ppmNO2-40 °C - 70 °C

20 - 90 %RH

With barrier

6100 34

ESF-X24P2

Oxygen

O2

25 %

0.1 %

N2

-40 °C - 70 °C

20 - 90 %RH

Without barrier〇
Future support
plannedFuture support
plannedHydrogen selective
High-humidity
compatible sensor–

AmmoniaNH3

75 ppm

0.5 ppm

–

–

–

–

–

–

ChlorineCL2

1.5 ppm

0.01 ppm

–

–

–

–

–

–

Carbon monoxideCO150 ppm

1 ppm

–

–

–

–

–

–

Hydrogen chloride

HCL

15 ppm0.1 ppm

–

–

–

–

–

–

Scheduled to be added tolineupScheduled to be added tolineupScheduled to be added tolineupScheduled to be added tolineup〇–Hydrogen selective

〇
–

–
–

* Please contact Riken Keiki for information on other gas types and detection ranges.

IRF
Non-dispersive infrared typeNCF
New ceramic type (catalytic type)

SGF
Semiconductor type

SHF
Hot-wire semiconductor type

ESF
Electrochemical type5

[SD-3 Series Specifications]
Model

Diffusion typeSD-3RI

SD-3NC

SD-3GH

SD-3GHS

SD-3SP

SD-3EC

SD-3ECS

SD-3ECB

Suction typeSD-3DRI

SD-3DNC

SD-3DGH

SD-3DGHS

SD-3DSP

SD-3DEC

SD-3DECS

SD-3DECB

Non-dispersive
infrared typeNew ceramic type(catalytic type)

Detection principle
Detection target gas
Display
Sampling method
Set flow rate
Gas alarm type
Fault alarm/self-diagnosis
Warning
Gas
Standard
concentration
outputOptionContact output (optional)
Power supply
Power consumption

Maximum 3.8 W

Cable connectors
Operating temperature/humidity range
Housing material
Protection level
External
Diffusion type
dimensions(excluding
cable glandSuction typeprojections)
WeightDiffusion type(excluding
Suction typecable glands)

Hot-wire
Electrochemical typesemiconductor typeCombustible gas/toxic gas/oxygen; detection range depends on detection target gas.
7-segment LED (5 digits) and 3-color lamps (red/green/yellow)
Diffusion/Suction (introduced via an external unit)
0.4 - 1.5 L/min
Two-step alarm (H-HH or H-L or L-LL)
System abnormality (E-9)/sensor abnormality (E-1)
Sensor life assessment/clock abnormality diagnosis/communication diagnosis/sensor warning
Gas concentration output (4 - 20 mA with HART), 4 - 20 mA DC (non-insulated, linear output),load resistance 600 Ω or less, maximum resolution 250 divisions (depending on specifications)RS-485 (half duplex)
SPDT (2 alarms, 1 fault output operation), 250 V 2 A AC, 30 V 1 A DC (resistance load), minimum load 5 V 0.1 A DC
24 V DC (18 V - 30 V DC)
Maximum 4.5 W
Maximum 4.5 W
Maximum 4.5 W
Maximum 3.5 W
Maximum 2.8 W
Maximum 2.8 W
Maximum 3.1 W
Japan Ex: Pressure-proof seal cable glands (M20 × 1.5/M25 × 1.5) (Compatible cable diameter 6.0 - 16.0 mm)
ATEX/IECEx: M25 × 1.5, adapters (option): NPT3/4, NPT1/2, M20 × 1.5
Japan Ex: -20 - +70 °C (no sudden changes), ATEX/IECEx: -40 - +70 °C (no sudden changes) 0 - 95 %RH or less (no condensation) or,
if restrictions apply, in accordance with sensor specifications
SCS14 stainless steel (equivalent to SUS316)
IP66/67 equivalent
Approximately 171 (W) × 322
Approximately 171 (W) × 277 (H) × 127 (D) mm(H) × 127 (D) mm
Semiconductor type

Approximately 171 (W) × 289 (H) × 127 (D) mm

Approximately 171 (W) × 334(H) × 127 (D) mm

Approximately 6.7 kg

Approximately 7.3 kg

Approximately 7.0 kg

Explosion-proof construction
ATEX
Explosion-proof
certification

IECEx
Japan Ex

Functional safety IEC 61508*

Approximately 7.6 kg

Flame-proof enclosure
II 2G Ex db IIC
T6/T5 Gb
Ex db IIC
T6/T5 Gb
Ex db IIC T5 Gb
SIL2 compliant(SIL3 compliant withredundancy)

II 2G Ex db IIC
T5/T4 Gb
Ex db IIC
T5/T4 Gb
Ex db IIC T4 Gb
SIL2 compliant(SIL3 compliant withredundancy)

II 2G Ex db IIC
T5/T4 Gb
Ex db IIC
T5/T4 Gb
Ex db IIC T4 Gb−

CE marking
HART communication

II 2G Ex db IIC
T6/T4 Gb
Ex db IIC
T6/T4 Gb
Ex db IIC T4 Gb

II 2G Ex db IIC
T5/T4 Gb
Ex db IIC
T5/T4 Gb
Ex db IIC T4 Gb

II 2G Ex db IIC
T4 Gb
Ex db IIC
T4 Gb
Ex db IIC T4 Gb
SIL2 compliant−−(SIL3 compliant
with redundancy)
ATEX Directive, EMC Directive, RoHS Directive
HART7

II 2G Ex db IIC
T4 Gb
Ex db IIC
T4 Gb
Ex db IIC T4 Gb
SIL2 compliant(SIL3 compliant
with redundancy)

Flame-proof enclosure+ Intrinsically safe explosionproof construction
II 2G Ex db ia IIC
T4 Gb
Ex db ia IIC
T4 Gb
Ex db ja IIC T4 Gb
Pending* Select SIL certified external units when used in conjunction with suction types. For information on target gases, refer to the F sensor list.

[Remote type: SD-3SC + GD-3 Series Specifications]
Main unit
Model

Remotesensor unit

Detection principle
Detection target gas
Display
Sampling method
Gas alarm type
Fault alarm/self-diagnosis
Warning
Gas
Standard
concentration
outputOptionContact output (optional)
Remote cable
Power source
Main unit
Power
Remoteconsumption
sensor unit
Cable connectors
Operating temperature/humidity range
Housing material
Protection level
External
Main unit
dimensions(excluding
Remotecable glandsensor unit
projections)
Main unit
Weight(excluding cable
Remoteglands)sensor unit
Main unit
Explosion-proof
Remoteconstruction
sensor unit
ATEX
Explosion-proof
certification

IECEx
Japan Ex

Functional safety IEC 61508*

SD-3SCGD-3RI

GD-3NCGD-3GH

GD-3GHS

GD-3SP

GD-3ECGD-3ECS

GD-3ECB

Non-dispersive
infrared typeNew ceramic typeHot-wire
Semiconductor type
Electrochemical type(catalytic type)semiconductor typeCombustible gas/toxic gas/oxygen; detection range depends on detection target gas.
7-segment LED (5 digits) and 3-color lamps (red/green/yellow)
Diffusion typeTwo-step alarm (H-HH or H-L or L-LL)
System abnormality (E-9)/sensor abnormality (E-1)
Sensor life assessment/clock abnormality diagnosis/communication diagnosis/sensor warning
Gas concentration output (4 - 20 mA with HART), 4 - 20 mA DC (non-insulated, linear output), load resistance 600 Ω or less, maximum resolution 250 divisions(depending on specifications)RS-485 (half duplex)
SPDT (2 alarms, 1 fault output operation), 250 V 2 A AC, 30 V 1 A DC (resistance load), minimum load 5 V 0.1 A DC
Shielded twisted pair cable 1.25 sq (1.38 mm2/AWG16), maximum 20 m between main unit (SD-3SC) and remote sensor unit (GD-3)
24 V DC (18 V - 30 V DC)
Maximum 5.0 W
Maximum 1.2 W

Maximum 2.0 W

Maximum 2.0 W

Maximum 2.0 W

Maximum 1.0 W

Maximum 1.0 W

Maximum 1.0 W

Maximum 1.0 W

Japan Ex: Pressure-proof seal cable glands (M20 × 1.5/M25 × 1.5) (Compatible cable diameter 6.0 - 16.0 mm)
ATEX/IECEx: M25 × 1.5, adapters (option): NPT3/4, NPT1/2, M20 × 1.5
Japan Ex: -20 - +70 °C (no sudden changes), ATEX/IECEx: -40 - +70 °C (no sudden changes) 0 - 95 %RH or less (no condensation) or,
if restrictions apply, in accordance with sensor specifications
SCS14 stainless steel (equivalent to SUS316)
IP66/67 equivalent
Approximately 171 (W) × 193 (H) × 127 (D) mm
Approximately 125 (W) × 240(H) × 88 (D) mm

Approximately 125 (W) × 195 (H) × 88 (D) mm
Approximately 6.0 kg
Approximately 3.0 kg

Approximately 4.0 kg

Flame-proof enclosure
Flame-proof enclosure
II 2G Ex db IIC
T6/T5 Gb
Ex db IIC
T6/T5 Gb
Ex db IIC T5 Gb
SIL2 compliant(SIL3 compliant withredundancy)

II 2G Ex db IIC
T5/T4 Gb
Ex db IIC
T5/T4 Gb
Ex db IIC T4 Gb
SIL2 compliant(SIL3 compliant withredundancy)

II 2G Ex db IIC
T5/T4 Gb
Ex db IIC
T5/T4 Gb
Ex db IIC T4 Gb

II 2G Ex db IIC
T6/T4 Gb
Ex db IIC
T6/T4 Gb
Ex db IIC T4 Gb

II 2G Ex db IIC
T5/T4 Gb
Ex db IIC
T5/T4 Gb
Ex db IIC T4 Gb

−

−

−

CE marking
HART communication

II 2G Ex db IIC
T4 Gb
Ex db IIC
T4 Gb
Ex db IIC T4 Gb
SIL2 compliant(SIL3 compliant withredundancy)

II 2G Ex db IIC
T4 Gb
Ex db IIC
T4 Gb
Ex db IIC T4 Gb
SIL2 compliant(SIL3 compliant withredundancy)

Flame-proof enclosure+ Intrinsically safe explosionproof construction
II 2G Ex db ia IIC
T4 Gb
Ex db ia IIC
T4 Gb
Ex db ja IIC T4 Gb
Pending

ATEX Directive, EMC Directive, RoHS Directive
HART7* For information on target gases, refer to the F sensor list.

[Terminal specifications: Power supply + 4 - 20 mA signal(with HART communication)]<Using 3-core cable>
Terminal No.
1
2
3

6

Power supply/signal cable connection
Power supply (+)
Common (Power supply (-), signal (-))
Signal (+)[Terminal specifications:Contact output (3c)]<Using 4-core cable>
Terminal No.
1
2
3

Power supply/signal cable connection
Power supply (+)
Power supply (-)
Signal (+)

4

Signal (-)

Terminal No.
1
2
3

Cable connection
N.O. (Normal Open)CommonN.C. (Normal Close)

MODEL SD-3 SERIES
SD-3 Series exterior drawings (excluding cable glands)

Diffusion type without EC barrier

Diffusion type with EC barrier

Remote type: SD-3SC + GD-3 Series exterior drawings (excluding cable glands)

Main unit (SD-3SC)

Remote sensor unit (GD-3 Series)
Diffusion type without EC barrier

Remote sensor unit (GD-3 Series)
Diffusion type with EC barrier

Optional accessories
Part No.: 4283 9011 00

Part No.: 4283 9016 60

Calibration adapter(for IRF sensor)

Splash guard(for IRF sensor)

Calibration adapter for the SD-3RI<Materials> Body: PP, nipple: stainless steel/Teflon

Part No.: 4283 9012 70
Calibration adapter(for NCF/SGF/SHF
sensors)

SD-3NC/GH/GHS/SP calibration adapter<Materials> Body: PP, nipple: stainless steel/Teflon

Part No.: 4283 9013 40
Calibration adapter(for ESF sensor)

SD-3EC/ECS/ECB calibration adapter<Materials> Body: PP, nipple: stainless steel/Teflon

Part No.: 4283 9019 80 (wall mounting)/4283 9045 60 (pipe mounting)Protective cover

Cover for protecting the SD-3 main unit
<Material> SUS316

Cover for protecting sensors against water and dust “1”is marked on the underside of the guard.
<Material> Resin

Part No.: 4283 9017 30
Splash guard(for NCF/SGF/SHF
sensors)

Cover for protecting sensors against water and dust “2”is marked on the underside of the guard.
<Material> Resin

Part No.: 4283 9031 80
Splash guard(for ECF sensor)

Cover for protecting sensors against water and dust “3” ismarked on the underside of the guard. <Material> Resin

Part No.: 4283 0030 20
Silicone removal
filter (SI-8)*1

Filter for SD-3NC/GH/GHS/SP for removing trace
amounts of silicone from the air. This can extend sensor
life.* 2

Part No.: 4283 0040 10Part No.: 4283 9015 90
Sunshade

Cover to minimize rise in temperature due to direct
sunlight or radiant heat
<Material> SUS316

Part No.: 4283 9018 10
Blankingplug

M25 × 1.5 blanking plug
<Material> Equivalent to SUS316

Part No.: 4283 9058 70
Adapter*4

Adapter for converting M25 × 1.5 threads to 1/2NPT
threads<Material> Equivalent to SUS316

Part No.: 4283 9057 00
Adapter*4

Adapter for converting M25 × 1.5 threads to 3/4NPT
threads<Material> Equivalent to SUS316

Part No.: 4283 9047 10
Adapter*4

Adapter for converting M25 × 1.5 threads to M20 × 1.5
threads<Material> Equivalent to SUS316

Part No.: 2905 2439 10
HART
communication
cable

Relay cable used when connecting a HART modem*1 We recommend fitting a splash guard when using filters.
*2 Installing the silicone removal filter will limit the target gases that can be detected.

Filter for SD-3NC/GH/GHS/SP for removing trace
amounts of silicone from the air. Fitting the filter extends
the sensor service life. The silicone removal capability of
Activated carbon filter
this filter exceeds that of the silicone removal filter.* 3(CF-8304)*1
It can also be used to remove interference gas. This
minimizes interference effects from gases other than thedetection target gas.
Part No.: 4262 9580 80
Duct mounting
kit

Kit for mounting the remote sensor head on a duct
<Material> SUS316

Part No.: 4283 9055 50
Lightning arrester*4(TP48-3-N-NDI)

Device for limiting instantaneous overvoltage due tolightningWith adapter (M25 × 1.5 → 1/2NPT)Part No.: 4283 9056 20
Lightning arrester*4(TP48-4-N-NDI)

Device for limiting instantaneous overvoltage due tolightningWith adapter (M25 × 1.5 → 1/2NPT)Part No.: 2564 0125 10
Fuse

Littelfuse fuse
(1.25 A, 100 V DC)

Part No.: 4283 9046 30
U-bolt components

U-bolt, spring washer, and hex nut used for mounting themain unit on a pole (size: 50A (2B)) <Material> SUS316*3 L imits the range of target gases that can be detected more than when the silicone
removal filter is fitted.
*4 Japan Ex not supported

7

Accessories
Name

Quantity

Part No.

Description

Control key*

4286 9200 80

Key used to operate the productOperating lever

×1

2594 0481 90

Tool used to connect cables to the terminal plateHex key wrench(2 across flats)*

1510 5020 40

Tool used to tighten M4 hex socket set screws* The number will differ depending on the number of units purchased. 1 -10 units: × 1, 11 - 20 units: × 2, 21 - 50 units: × 3, 51 or more units: × 4

Order information
SD-3① ② ( ③ ④ ⑤

0

⑦ ⑧ )

Explosion-proof
application type

[Remote type: Main unit (SD-3SC) + Sensor unit (GD-3 Series)]
SD-3SC ( ③ ④ ⑤

①

D

③

④

⑦ ⑧ )

Diffusion type/suction type selection
Blank

②

0

GD-3

⑤

Diffusion type

Sensor type selection
RI

Non-dispersive infrared typeNC

New ceramic type (catalytic type)GH

Semiconductor type1⑥⑦

Functional safety IEC 61508*10Suction type
(introduced via an external unit)②

Range setting*2

N/A

0Single range

SIL (selectable with RI/NC/EC/ECS
only)

1

Double range + 4-16 (selectable with NC only)2

Double range + L4-20 (selectable with NC only)

3

Double range + H4-20 (selectable with NC only)

Performance certification
0

N/A

1

―

2

―

3

―

⑧

Output type selection0

4 - 20 mA with HART1

4 - 20 mA with HART + contact (3c)

2

―

GHS

Semiconductor type + sintered metal(selectable for CS2 only)SP

Hot-wire semiconductor type

EC

Electrochemical type(selectable for CO/O2 only)*1 Double range is not available when SIL is selected.
*2 H
 ART communication is unavailable when double range(optional) is selected.

ECS

Electrochemical type + sintered metal(selectable for H2S only)

Connector 3 * Not used

ECB

Electrochemical type + barrier(selectable for gases other than
CO/O2/H2S)

Cable connectors (See diagram on right.)
0Connector 1 + Connector 2Connector 2Connector 4

1

Connector 1 + Connector 2+ Connector 4 + Connector 5Standard

OptionExplosion-proof
1

ATEX/IECEx

2

―

3

Japan EX

4―

Connector 1

Connector 5Standard

OptionExample: Cable connectors* Connectors must always be blanked off with blanking plugs (sold separately) when not in use.

Distributed by:
2 -7-6 Azusawa, Itabashi-ku, Tokyo 174 - 8744, Japan

Phone : +81-3-3966-1113
Telefax : +81-3-3558-9110
E-mail : intdept@rikenkeiki.co.jp
Web site : https://www.rikenkeiki.co.jp/english※ The contents described in this catalog are

subject to change without notice according
to the performance improvement.

PC2E-0371-230605 S