Riken Keiki SD-3 Series User manual

PT2E-3011
Gas Detector with Signal Converter
SD-3 Series
Operating Manual
2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Website: https://www.rikenkeiki.co.jp/

Contents
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Contents
1. Product Overview ................................................................................................................................................. 4
1-1 Introduction .................................................................................................................................................. 4
1-2 Intended use and features .......................................................................................................................... 6
1-2-1 Models and Codes........................................................................................................................... 6
1-2-2 Detection principles and detection target gases for individual models........................................... 7
1-2-3 Product features............................................................................................................................... 8
1-3 Usage zones and conditions....................................................................................................................... 9
1-4 DANGER, WARNING, and NOTE............................................................................................................ 10
2. Important Safety Information.............................................................................................................................. 11
2-1 Danger information.................................................................................................................................... 11
2-2 Warning information .................................................................................................................................. 11
2-3 Caution information ................................................................................................................................... 12
2-4 Safety information...................................................................................................................................... 13
3. Product Configuration......................................................................................................................................... 30
3-1 Main unit and accessories......................................................................................................................... 30
3-1-1 Main unit (SD-3) ............................................................................................................................. 30
3-1-2 Main unit (SD-3SC)........................................................................................................................ 31
3-1-3 Remote sensor head (GD-3) ......................................................................................................... 31
3-1-4 Standard accessories .................................................................................................................... 32
3-1-5 Optional accessories...................................................................................................................... 33
3-2 Part names and functions ......................................................................................................................... 36
3-3 Block diagrams .......................................................................................................................................... 37
4. Installation........................................................................................................................................................... 39
4-1 Installation precautions.............................................................................................................................. 39
4-1-1 General installation information ..................................................................................................... 39
4-1-2 Restrictions regarding installation.................................................................................................. 40
4-2 System design precautions....................................................................................................................... 44
4-2-1 Using a stable power supply.......................................................................................................... 44
4-2-2 Lightning strike protective measures............................................................................................. 44
4-3 Providing maintenance space................................................................................................................... 45
4-4 Main unit installation .................................................................................................................................. 47
4-4-1 Vertical pole mounting.................................................................................................................... 47
4-4-2 Wall mounting................................................................................................................................. 48
4-4-3 Attaching protective cover.............................................................................................................. 49
4-4-4 Attaching sunshade cover ............................................................................................................. 51
4-5 Remote sensor head (GD-3) installation .................................................................................................. 53
4-5-1 Wall mounting................................................................................................................................. 53
4-5-2 Duct mounting ................................................................................................................................ 53
4-6 Connecting the grounding terminal........................................................................................................... 55
4-7 Connecting the power and signal cables.................................................................................................. 56
4-7-1 Main unit cable and device connectors ......................................................................................... 56
4-7-2 Connecting the power and signal cables to the main unit ............................................................ 58
4-7-3 Connecting the power and signal cables to the remote sensor head (GD-3) ....................................... 61
4-7-4 Connecting the main unit (SD-3SC) and remote sensor head (GD-3)......................................... 64
4-7-5 Connecting cables to the terminal plate ........................................................................................ 69
4-8 Mounting the sensor.................................................................................................................................. 72
4-9 Alarm relay setting (option) ....................................................................................................................... 73
4-10 Mounting the splash guard...................................................................................................................... 76

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5. Usage Instructions.............................................................................................................................................. 78
5-1 Preparations for startup............................................................................................................................. 78
5-2 Startup ....................................................................................................................................................... 79
5-3 Basic operation flow .................................................................................................................................. 81
5-4 Operating procedure ................................................................................................................................. 82
5-5 User mode ................................................................................................................................................. 83
5-5-1 User mode setting items ................................................................................................................ 83
5-5-2 Switching to user mode ................................................................................................................. 84
5-6 Performing zero calibration ....................................................................................................................... 85
5-7 Checking settings ...................................................................................................................................... 87
5-7-1 Checking alarm setpoints .............................................................................................................. 87
5-8 Shutting down............................................................................................................................................ 89
6. Storage, Relocation, and Disposal..................................................................................................................... 90
6-1 Procedures for storage or when not in use for extended periods ............................................................ 90
6-2 Procedures for relocation or reuse............................................................................................................ 92
6-3 Product disposal ........................................................................................................................................ 92
7. Troubleshooting .................................................................................................................................................. 93
7-1 Product abnormalities................................................................................................................................ 93
7-2 Reading abnormalities............................................................................................................................... 94
8. Product Specifications........................................................................................................................................ 96
8-1 Detection target gases for individual detection principles ........................................................................ 96
8-1-1 Non-dispersive infrared absorption type (Infrared type)................................................................ 96
8-1-2 New ceramic type .......................................................................................................................... 98
8-1-3 Semiconductor type ....................................................................................................................... 99
8-1-4 Hot-wire semiconductor type ....................................................................................................... 101
8-1-5 Electrochemical type.................................................................................................................... 103
Product warranty .............................................................................................................................................. 104
Sensor warranty ............................................................................................................................................. 104
Revision History................................................................................................................................................ 105

1. Product Overview 1-3 Usage zones and conditions
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1-3 Usage zones and conditions
The product is approved for use in areas where gases classified in explosive gas groups IIA, IIB, or IIC may be
present. This refers to use limited to hazardous zones categorized as Zone 1 or Zone 2 within the product
operating temperature range.

1. Product Overview 1-4 DANGER, WARNING, and NOTE
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1-4 DANGER, WARNING, and NOTE
This operating manual uses the following categories to indicate potential damage/hazards if the user disregards
the information provided and uses the product incorrectly:
DANGER This indicates situations in which improper handling may result in fatal or
serious injury or significant property damage.
WARNING This indicates situations in which improper handling may result in serious injury
or significant property damage.
CAUTION This indicates situations in which improper handling may result in minor injury
or minor property damage.
Additionally, usage recommendations are indicated as follows:
NOTE This indicates items that will be helpful to know when using the product.

2. Important Safety Information 2-1 Danger information
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2
Important Safety
Information
2-1 Danger information
DANGER
Do not open the cover while the power is turned on. When opening the cover, use a portable gas
detector or other similar device to confirm that there is no gas present in the vicinity.
Do not attempt to repair the product.
Do not attempt to repair or replace the explosion-proof bonding surface. If you observe scratches, cracks,
or deformation on the housing or explosion-proof bonding surface, stop using the product immediately
and contact Riken Keiki promptly.
2-2 Warning information
WARNING
Before turning on the power for the product, be sure to confirm that the power source meets the specified
voltage requirements.
Using power supplies other than the stipulated voltage will damage the product. Do not use unstable
power supplies. Doing so may result in malfunctions.
Do not disconnect the protective grounding wire or terminal.
Before operating the product, check the protective functions for defects.
Do not operate the product if you suspect any problems with the protective grounding or other protective
functions.
Connect to a protective ground before connecting to external control circuits.
Before adjusting zero for the surrounding atmosphere, confirm that the surrounding atmosphere contains
clean air.
The presence of interference gases will prevent proper air calibration. The presence of miscellaneous
gases is also extremely dangerous because the product may not detect actual gas leaks correctly.
A gas alarm indicates the presence of extreme danger. The user must take appropriate action after taking
suitable steps to ensure safety.
Do not immerse the product in organic solvents for extended periods. The flame arrester components are
made of polyphenylene sulfide (PPS) resin.

2. Important Safety Information 2-3 Caution information
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2-3 Caution information
CAUTION
The product operation may be affected by radio waves emitted from walkie-talkies or other radio
transmitters used near the product or its cables. Position walkie-talkies or other similar devices so that
they do not affect the product operation.
Wait at least 10 seconds before turning the power back on again after turning off. The product may not
function correctly if the power is turned back on immediately.
The product is not a control device. Never use the product output to control other devices.
Do not disassemble or alter the product. Product performance cannot be guaranteed if the product is
disassembled or modified.
Do not alter settings unnecessarily unless you are fully aware of the consequences. Doing so may result
in improper alarm function. Avoid performing any operations not described in this operating manual.
The product is a safety device. Be sure to maintain the product at regular intervals to ensure safety.
Continuing to use the product without adequate maintenance will result in sensor sensitivity degradation
and prevent proper gas detection.

2. Important Safety Information 2-4 Safety information
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・The client should not try to replace the batteries.
<Applicable standards>
IEC 60079-0:2017
IEC 60079-1:2014
IEC 60079-11:2011
EN IEC 60079-0:2018
EN 60079-1:2014
EN 60079-11:2012
<Operating manual no.>
PT2-287
2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Phone: [phone]
Fax: [phone]
Email: [email protected]
Website: https://www.rikenkeiki.co.jp