Riken Keiki SD-3 Series Technical Manual
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Riken Keiki SD-3 Series Technical Manual

Riken Keiki SD-3 Series Technical Manual

Gas detector with signal converter
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PT2E-2871
Gas Detector with Signal Converter
SD-3 Series
Technical Manual
2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Website: https://www.rikenkeiki.co.jp/

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Summary of Contents for Riken Keiki SD-3 Series

  • Page 1 PT2E-2871 Gas Detector with Signal Converter SD-3 Series Technical Manual 2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan Website: https://www.rikenkeiki.co.jp/...

  • Page 2: Table Of Contents

    Contents Contents Product Overview ..............................5 1-1 Introduction ..............................5 1-2 Intended use and features .......................... 7 1-2-1 Models and Codes ........................... 7 1-2-2 Detection principles and detection target gases for individual models ........... 8 1-2-3 Product features ..........................9 1-3 Usage zones and conditions ........................
  • Page 3 Contents Usage Instructions .............................. 79 5-1 Preparations for startup ..........................79 5-2 Startup ............................... 80 5-3 Basic operation flow ..........................82 5-4 Operating procedure ..........................83 5-5 User mode ..............................84 5-5-1 User mode setting items ........................ 84 5-5-2 Switching to user mode ......................... 85 5-6 Performing zero calibration ........................
  • Page 4 Contents 8-2 Procedures for relocation or reuse ......................136 8-3 Product disposal ............................136 Troubleshooting ..............................137 9-1 Product abnormalities ..........................137 9-2 Reading abnormalities ..........................138 Product Specifications ............................140 10-1 SD-3 specifications ..........................140 10-1-1 SD-3 (model without EC barrier) ....................140 10-1-2 SD-3 (model with EC barrier) .......................

  • Page 5: Product Overview

    The contents of this manual are subject to change without notice to allow product improvements. Any duplication or reproduction of this manual without permission is prohibited, whether in whole or in part. Riken Keiki accepts no liability for accidents or damage resulting from use of the product, whether within or outside the warranty period.
  • Page 6 1. Product Overview 1-1 Introduction <This operating manual> In this operating manual, where descriptions differ according to the detection principle, these are indicated by the following icons: Non-dispersive infrared absorption type (infrared type) New ceramic type Semiconductor type Hot-wire semiconductor type Electrochemical type Operating procedures and specifications for which no icons appear apply to all detection principles.

  • Page 7: Intended Use And Features

    1. Product Overview 1-2 Intended use and features 1-2 Intended use and features The product is a fixed explosion-proof device for continuous monitoring of combustible gases, toxic gases, and oxygen in the air. An alarm is triggered if combustible gases, toxic gases, or oxygen exceeding preset concentrations are detected in the air.

  • Page 8: Detection Principles And Detection Target Gases For Individual Models

    1. Product Overview 1-2 Intended use and features 1-2-2 Detection principles and detection target gases for individual models The product is available in the following models, depending on the specific detection method and detection principle. Check the specifications before use to confirm that correct gases will be detected in accordance with the intended purpose.

  • Page 9: Product Features

     The concentration of the gas detected is converted to a 4 - 20 mA analog output (NAMUR NE43 compliant) or a digital HART output signal.  It can be connected to a Riken Keiki monitoring system or programmable logic controller (PLC) via a ceiling fitting or approved cable gland.

  • Page 10: Usage Zones And Conditions

    1. Product Overview 1-3 Usage zones and conditions 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.

  • Page 11: Danger, Warning, And Note

    1. Product Overview 1-4 DANGER, WARNING, and NOTE 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: This indicates situations in which improper handling may result in fatal or DANGER serious injury or significant property damage.

  • Page 12: Important Safety Information

     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 ...

  • Page 13: Caution Information

    2. Important Safety Information 2-3 Caution information 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.

  • Page 14: Safety Information

    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 used with a suction cap fitted.
  • Page 15 2. Important Safety Information 2-4 Safety information  The SD-3SC is used with a remote sensor head (GD-3) from among the following models: Model Detection principle (Detection method: Diffusion type) SD-3 GD-3 (Remote sensor head) Optical sensor Non-dispersive infrared absorption GD-3RI type (infrared type) Solid state sensor...
  • Page 16 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 depending on whether the optional lightning arrester is fitted. Refer to the following performance data for each model: <Without lightning arrester>...
  • Page 17 2. Important Safety Information 2-4 Safety information <With lightning arrester> Explosion- Explosion-proof Model Group Category Ambient temperature* proof class construction SD-3RI SD-3DRI Ex db IIC T6/T5 -40 °C ≤ Ta ≤ +60 °C/+70 °C GD-3RI SD-3GH SD-3DGH Ex db IIC T5/T4 -40 °C ≤...
  • Page 18 2. Important Safety Information 2-4 Safety information <Electrical data> Option (select one) Alarm relay Power No alarm relay/ Model Supply voltage Signal output (contact output)/ Digital consumption No digital Resistance load communication communication only SD-3RI 30 V DC, 1 A 24 V DC 3.8 W Max 0 - 22 mA + HART...
  • Page 19 2. Important Safety Information 2-4 Safety information ・ The client should not try to replace the batteries. <Applicable standards>  IEC 60079-0:2017  IEC 60079-1:2014  IEC 60079-11:2011  EN 60079-0:2018  EN 60079-1:2014  EN 60079-11:2012 <Operating manual no.> ...
  • Page 20 2. Important Safety Information 2-4 Safety information <System configuration diagrams> Installation diagram Hazardous area Non-hazardous (Zone 1) area Gas detector (SD-3) Display POW(+) POW(+) COM(−) COM(−) Signal cable Sig(+) Sig(+) Sig(−) Sig(−) Installation diagram Hazardous area Non-hazardous (Zone 1) area Gas detector (SD-3) Display POW(+)
  • Page 21 2. Important Safety Information 2-4 Safety information Installation diagram Hazardous area Non-hazardous (Zone 1) area Gas detector (SD-3 (RS-485)) Display POW(+) POW(+) COM(−) COM(−) Signal cable Sig(+) Sig(+) Sig(−) Sig(−) RS-485 RS-485 Signal cable Installation diagram Hazardous area Non-hazardous (Zone 1) area Gas detector (SD-3SC) Display...
  • Page 22 2. Important Safety Information 2-4 Safety information Installation diagram Hazardous area Non-hazardous (Zone 1) area Gas detector (SD-3SC) Display POW(+) POW(+) COM(−) COM(−) Signal cable Sig(+) Sig(+) Sig(−) Sig(−) Remote sensor head (GD-3) POW(+) POW(+) COM(−) Signal COM(−) Signal cable RS-485(Y) RS-485(Y) cable...
  • Page 23  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.
  • Page 24 2. Important Safety Information 2-4 Safety information <Connector screw thread types and sizes (SD-3/SD-3SC)> Connector 3 Connector 2 Connector 4 Connector 1 Connector 5 Connector 6 <Standard> Connector 1 Connector 2 Connector 3 Connector 4 Connector 5 Connector 6 M25 × 1.5 M25 ×...
  • Page 25 2. Important Safety Information 2-4 Safety information <Components that can be connected (SD-3/SD-3SC)> The following components can be connected to the main unit (SD-3/SD-3SC): Connector Connector Connector Connector Connector Connector Sensor assembly × × × × × 〇 EC barrier ×...
  • Page 26 2. Important Safety Information 2-4 Safety information The “X” at the end of the certificate number indicates the following special operating conditions: Certificate numbers “X” specific operating conditions Judgment Use terminals suitable for the operating conditions or use appropriate termination within the bonds to protect against Conforms as mechanical damage—for example, when pulling assembly.
  • Page 27 2. Important Safety Information 2-4 Safety information <Components that can be connected (GD-3)> Connector 1 Connector 2 Connector 3 The following components can be connected to the remote sensor head (GD-3): Connector Connector Connector Sensor assembly × × 〇 EC barrier ×...
  • Page 28 2. Important Safety Information 2-4 Safety information <Connection examples> SD-3SC GD-3RI SD-3SC GD-3ECB 28 / 168...
  • Page 29 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 29 / 168...
  • Page 30 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”...

  • Page 31: Product Configuration

    3-1 Main unit and accessories Product Configuration 3-1 Main unit and accessories Open the box and packaging and inspect the main unit and accessories. If anything is missing, contact Riken Keiki. 3-1-1 Main unit (SD-3) <Diffusion type> <Model without EC barrier>...

  • Page 32: Main Unit (Sd-3Sc)

    3. Product Configuration 3-1 Main unit and accessories 3-1-2 Main unit (SD-3SC) 3-1-3 Remote sensor head (GD-3) <Diffusion type> <Model without EC barrier> <Model with EC barrier> 32 / 168...

  • Page 33: Standard Accessories

    3. Product Configuration 3-1 Main unit and accessories 3-1-4 Standard accessories Standard accessory Quantity Part No. Description Varies depending Key used to control the Control key 4286 9200 80 on quantity product ordered. Tool used when connecting Operating lever ×1 2594 0481 90 cable to terminal plate Varies...

  • Page 34: Optional Accessories

    3. Product Configuration 3-1 Main unit and accessories 3-1-5 Optional accessories Optional accessory Part No. Description SD-3RI calibration adapter Calibration adapter <Material> 4283 9011 00 (for IRF sensor) Body: PP Nipple: Stainless steel/Teflon SD-3NC/GH/GHS/SP calibration adapter Calibration adapter <Material> 4283 9012 70 (for combustible gas sensor) Body: PP...
  • Page 35 3. Product Configuration 3-1 Main unit and accessories Optional accessory Part No. Description SD-3NC/GH/GHS/SP cover to protect sensor from water and dust Splash guard The identification number “2” 4283 4137 9A (for combustible is engraved on the underside. gas sensor) <Material>...
  • Page 36 3. Product Configuration 3-1 Main unit and accessories Optional accessory Part No. Description Filter for removing trace amounts of silicone from the air. This can extend sensor life. The silicone removal Activated carbon capability of this filter exceeds filter 4283 0040 10 that of the silicone removal filter.* (CF-8304)

  • Page 37: Part Names And Functions

    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 ＜SD-3SC＞ ⑤ ③ ⑪ ⑫ ⑬ Name Function MENU/ESC key Hold down this key in detection mode to switch to user mode.

  • Page 38: Block Diagrams

    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 supply voltage converter ・ POWER ・ ALM1 ・ ALM2 ・...
  • Page 39 3. Product Configuration 3-3 Block diagrams <SD-3SC> Power supply unit 24 V DC Display (LED) Power supply voltage converter ・ POWER ・ ALM1 ・ ALM2 ・ FAULT External output ・ PPM 4 - 20 mA + HART ・ %LEL ・ % HART modem Display Control...

  • Page 40: Installation

    4. Installation 4-1 Installation precautions Installation 4-1 Installation precautions Selecting an appropriate installation location is vital for system performance. Be sure to observe the following precautions before installing. Failure to comply with these precautions may result in failure of the product or improper function. CAUTION ...

  • Page 41: Restrictions Regarding Installation

    4. Installation 4-1 Installation precautions 4-1-2 Restrictions regarding installation <Do not install in locations subject to vibration or impact.> The product contains precision electronic components. Install the product in a stable location not exposed to vibration, impact, or risk of falling. <Do not install in locations exposed to water, oil, or chemicals.>...
  • Page 42 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 have a cross section of 1.308 mm (AWG16) or 2.082 mm (AWG14).
  • Page 43 4. Installation 4-1 Installation precautions • Alarm relay contact welding, insulation failure, contact failure • Damage to electrical components due to high voltage inside the product • Malfunctions due to CPU runaway If the product is used to operate loads, take the following measures to stabilize product operations and protect the alarm contacts: •...
  • Page 44 4. Installation 4-1 Installation precautions CAUTION  A de-energized b contact (break contact) may result in momentary opening in the event of an external force or other physical impact. If a b contact is used as an alarm contact, implement measures to account for such momentary operations—for example, by adding a delay operation (of approximately one second) to the signal on the b contact receiving side.

  • Page 45: System Design Precautions

    4. Installation 4-2 System design precautions 4-2 System design precautions Consider the following precautions when designing a system in which the product is used: CAUTION  An unstable power supply or noise may result in malfunctions or false alarms.  Consider the details described in this section before designing a system that uses the product.

  • Page 46: Providing Maintenance Space

    4. Installation 4-3 Providing maintenance space 4-3 Providing maintenance space When mounting the product, allow space to open and close the covers during maintenance. <Main unit (SD-3/SD-3SC)> 1200 *The diagram illustrates the SD-3. The maintenance space for the SD-3SC is identical. <Remote sensor head (GD-3)>...
  • Page 47 4. Installation 4-3 Providing maintenance space CAUTION The product requires periodic maintenance. Do not install in the following or similar locations where maintenance is dangerous or not possible:  Locations such as within systems that must be stopped for maintenance ...

  • Page 48: Main Unit Installation

    4. Installation 4-4 Main unit installation 4-4 Main unit installation 4-4-1 Vertical pole mounting Mount the main unit (SD-3/SD-3SC) to a vertical pole (size: 50A (2B)) using two U bolts. Fit one U bolt around the vertical pole and through the upper slots on the main unit. Secure the U bolt to the main unit with two washers, two spring washers, and two M10 nuts.

  • Page 49: Wall Mounting

    4. Installation 4-4 Main unit installation 4-4-2 Wall mounting Mount the main unit (SD-3/SD-3SC) to a wall. Place the main unit against the wall surface and secure with four M10 double SEMS bolts. Bolt positions Bolt positions *The diagram illustrates the SD-3. The mounting method for the SD-3SC is identical. CAUTION The product requires periodic maintenance.

  • Page 50: Attaching Protective Cover

    4. Installation 4-4 Main unit installation 4-4-3 Attaching protective cover Attach the protective cover to the main unit (SD-3/SD-3SC). <Pole mounting (pole size: 50A (2B))> Attach the chassis and mounting bracket to the main unit. Secure with four M5  6 double SEMS bolts from behind, as shown in the diagram to the right.
  • Page 51 4. Installation 4-4 Main unit installation <Wall mounting> Secure the main unit and chassis with four M10 double SEMS bolts. Chassis Lugs Attach the protective cover, aligning it with the two lugs at Protective cover the top of the chassis. Secure the protective cover in place by tightening the knurled screws on either side of the cover.

  • Page 52: Attaching Sunshade Cover

    4. Installation 4-4 Main unit installation 4-4-4 Attaching sunshade cover Attach the sunshade cover to the main unit (SD-3/SD-3SC). <Pole mounting (pole size: 50A (2B))> Chassis Fit one U bolt around the vertical pole and through the upper slots on the main unit. Secure with the chassis, two washers, two spring washers, and two M10 nuts.
  • Page 53 4. Installation 4-4 Main unit installation <Wall mounting> Secure the main unit and chassis with four M10 double Chassis SEMS bolts. Attach the sunshade cover, aligning it with the two lugs at Lugs the top of the chassis. Sunshade cover Secure the sunshade cover in place by tightening the knurled screws on either side of the cover.

  • Page 54: Remote Sensor Head (Gd-3) Installation

    4. Installation 4-5 Remote sensor head (GD-3) installation 4-5 Remote sensor head (GD-3) installation 4-5-1 Wall mounting Place the remote sensor head (GD-3) against the wall surface and secure with two M6 double SEMS bolts. Bolt positions 4-5-2 Duct mounting Attach the remote sensor head (GD-3) to a duct.
  • Page 55 4. Installation 4-5 Remote sensor head (GD-3) installation Insert the remote sensor head (GD-3) into the duct Duct mounting kit mounting kit and secure with four M5 bolts. Connect a tube to the sensor on the remote sensor head (GD-3) to enable calibration. The tube should protrude from the top of the duct mounting kit.

  • Page 56: Connecting The Grounding Terminal

    4. Installation 4-6 Connecting the grounding terminal 4-6 Connecting the grounding terminal WARNING  Be sure to ground the product before turning on the power.  To ensure stable operation and safety, be sure to ground the product. Never connect grounding wires to gas pipes.

  • Page 57: Connecting The Power And Signal Cables

    4. Installation 4-7 Connecting the power and signal cables 4-7 Connecting the power and signal cables 4-7-1 Main unit cable and device connectors The cable and device connectors on the main unit are as follows: <SD-3> ・Power supply and signal <Optional>...
  • Page 58 4. Installation 4-7 Connecting the power and signal cables NOTE  Use the approved cable glands when connecting the remote sensor head (GD-3).  Up to two external cable connectors can be used at the same time (excluding the remote sensor head (GD-3) connector cable).

  • Page 59: Connecting The Power And Signal Cables To The Main Unit

    4. Installation 4-7 Connecting the power and signal cables 4-7-2 Connecting the power and signal cables to the main unit Connect the power cable, signal cable, and contact cables to the main unit (SD-3/SD-3SC). Unscrew the M4 hex socket set screw on the main unit cover, then rotate the cover counterclockwise to remove.
  • Page 60 4. Installation 4-7 Connecting the power and signal cables Attach cable glands or conduits to the connectors on the Cable gland main unit. Use appropriate cable glands or conduits to suit the purpose and type of the cable. Cable gland Pull out the terminal plates from the terminal plate board.
  • Page 61 4. Installation 4-7 Connecting the power and signal cables Mount the terminal plates on the terminal plate board. Power and signal terminal plate Adjust the cable position so that no load is applied to the terminal plates. Contact output terminal plates 10 Return the display unit to its original position and secure with the two M3 screws.

  • Page 62: Connecting The Power And Signal Cables To The Remote Sensor Head (Gd-3)

    4. Installation 4-7 Connecting the power and signal cables 4-7-3 Connecting the power and signal cables to the remote sensor head (GD-3) Unscrew the single M4 screw on the remote sensor head (GD-3) cover. Hex key wrench Use a hex key wrench (2 across flats) to unscrew the M4 hex socket set screw.
  • Page 63 4. Installation 4-7 Connecting the power and signal cables Connect the power and signal cables to the terminal plate. Connect the cables to the following terminals on the terminal plate. For information on how to connect cables to the terminal plate, refer to ‘4-7-5 Connecting cables to the terminal plate’.
  • Page 64 4. Installation 4-7 Connecting the power and signal cables Rotate the cover clockwise to attach and secure with the single M4 hex socket set screw. Hex key wrench Use a hex key wrench (2 across flats) to tighten the M4 hex socket set screw.

  • Page 65: Connecting The Main Unit (Sd-3Sc) And Remote Sensor Head (Gd-3)

    4. Installation 4-7 Connecting the power and signal cables 4-7-4 Connecting the main unit (SD-3SC) and remote sensor head (GD-3) Unscrew the M4 hex socket set screw on the main unit (SD-3SC) cover, then rotate the cover counterclockwise to remove. Use a hex key wrench (2 across flats) to unscrew the M4 hex socket set screw.
  • Page 66 4. Installation 4-7 Connecting the power and signal cables Pull out the remote connection terminal plate from the terminal plate board. Unscrew the single M3 screw securing the clamp and remove the clamp. Screw (M3) Clamp Connect the power and signal cables extending from the remote sensor head (GD-3) to the remote connection terminal plate.
  • Page 67 4. Installation 4-7 Connecting the power and signal cables Clamp the shield wire. Use the single M3 screw to clamp the cable shielding. Shielding Screw (M3) Clamp 10 Return the display unit to its original position and secure with the two M3 screws. Take care not to trap the cable here.
  • Page 68 4. Installation 4-7 Connecting the power and signal cables ＜SD-3SC and GD-3 connection example＞ SD-3SC Cable glands GD-3 Cable <SD-3/SD-3SC and RM-5003 terminal plate connection example> RM-5003 SD-3/SD-3SC Shielded cable 68 / 168...
  • Page 69 4. Installation 4-7 Connecting the power and signal cables <Indicator connection example> SD-3 <SD-3> Connect the shield to the grounding Indicator (e.g., RM-5003) bolt on the chassis Power supply Common Signal (+) SD-3SC <SD-3SC> Connect the shield to the grounding bolt Indicator (e.g., RM-5003) on the chassis Power supply...

  • Page 70: Connecting Cables To The Terminal Plate

    4. Installation 4-7 Connecting the power and signal cables 4-7-5 Connecting cables to the terminal plate Strip the cable to the specified length and connect to the cable wire insertion holes on the terminal plate. <Terminal plate specifications>  Rated voltage: 300 V AC ...
  • Page 71 4. Installation 4-7 Connecting the power and signal cables <Connecting cables to terminal plate> To connect cables to the terminal plate, use the operating lever provided as a standard accessory or a flathead screwdriver (blade tip 2.5 mm × 0.5 mm). The operating lever provided as a standard accessory cannot be used when connecting power and signal cables to TN1 on the SD-3.
  • Page 72 4. Installation 4-7 Connecting the power and signal cables When using a flathead screwdriver to connect to TN1 on the SD-3, connect the cable to the terminal plate as follows: Insert the flathead screwdriver into the screwdriver slot (rectangular hole) in the terminal Flathead screwdriver plate as shown in the figure to the right.

  • Page 73: Mounting The Sensor

    4. Installation 4-8 Mounting the sensor 4-8 Mounting the sensor Mount the sensor on to the main unit (SD-3) or remote sensor head (GD-3). Remove suction cap, splash guard, and filter, if fitted. Unscrew the single M4 bolt securing the sensor guard. Use a hex key wrench (2 across flats) to unscrew the M4 hex socket set screw.

  • Page 74: Alarm Relay Setting (Option)

    4. Installation 4-9 Alarm relay setting (option) Confirm that the sensor is fully inserted. Sensor Sensor is not fully inserted. Attach the sensor guard to the main unit. Attach using a hex key wrench (8 across flats) or wrench. Use the single M4 hex socket set screw to secure the sensor guard in place.
  • Page 75 4. Installation 4-9 Alarm relay setting (option) CAUTION  Note that recurring use with the alarm relay contacts normally closed may result in the contacts seizing due to minute vibrations.  Connect the alarm relay cable and sensor before turning on the power to the product. To set the alarm relay, connect the alarm unit cables to the TN2 (Relay1), TN3 (Relay2), and TN4 (Relay3) terminal plates on the main unit (SD-3/SD-3SC).
  • Page 76 4. Installation 4-9 Alarm relay setting (option) Pull out the terminal plates (TN2 (Relay1), TN3 (Relay2), and TN4 (Relay3)) from the terminal plate board. Connect the alarm unit wires to the corresponding terminals on the detached terminal plates. Use either terminal 1 (N.O.) or terminal 3 (N.C.) on the terminal plate.

  • Page 77: Mounting The Splash Guard

    4. Installation 4-10 Mounting the splash guard 4-10 Mounting the splash guard When using a silicone removal filter or activated carbon filter, fit the filter inside the splash guard before mounting the splash guard. When using a silicone removal filter or activated Cover carbon filter, remove the splash guard cover, fit the filter inside the splash guard, and reattach the cover.
  • Page 78 4. Installation 4-10 Mounting the splash guard NOTE  Three different splash guard types are available: for the IRF sensor; for the combustible gas sensor; and for the ESF sensor. The corresponding identification number is engraved on the underside of each splash guard. Identification ・...

  • Page 79: Usage Instructions

    5. Usage Instructions 5-1 Preparations for startup Usage Instructions 5-1 Preparations for startup Carry out the following checks before connecting the power supply. Failure to perform these checks may result in electric shock or damage to the product.  Check to confirm that the product is grounded. ...

  • Page 80: Startup

    5. Usage Instructions 5-2 Startup 5-2 Startup CAUTION  Check to confirm that the product has been correctly installed before turning on the power supply (24 V DC). Turn on the power supply (24 V DC) and start the product. The product takes approximately 25 seconds before switching to detection mode after the power is turned on.
  • Page 81 5. Usage Instructions 5-2 Startup CAUTION  Never turn off the power while initialization is underway. The internal memory is read during initialization.  A specific warmup is required for each sensor type at startup and after sensor replacement. Allow the product to warm up for the specified time.

  • Page 82: Basic Operation Flow

    5. Usage Instructions 5-3 Basic operation flow 5-3 Basic operation flow After the power is turned on, the product operates as follows when you press the MENU/ESC key: <Detection mode> MENU/ESC key (long press) Power is turned back on after recovery. MENU/ESC key (long press) <User mode>...

  • Page 83: Operating Procedure

    5. Usage Instructions 5-4 Operating procedure 5-4 Operating procedure The product is operated using the control key. Use the control key to touch the four keys (MENU/ESC key, SET key, ▲ key, and ▼ key) on the front of the product.

  • Page 84: User Mode

    5. Usage Instructions 5-5 User mode 5-5 User mode Switching to user mode lets you perform zero calibration and check various settings. CAUTION  Do not alter settings unnecessarily. Altering the settings without a proper understanding of the details may prevent the product from operating correctly. 5-5-1 User mode setting items Item No.

  • Page 85: Switching To User Mode

    5. Usage Instructions 5-5 User mode 5-5-2 Switching to user mode Hold down the MENU/ESC key (for approximately three seconds) in detection mode. The product switches to user mode. Press the ▲ or ▼ key to select the required item number, then press the SET key.

  • Page 86: Performing Zero Calibration

    5. Usage Instructions 5-6 Performing zero calibration 5-6 Performing zero calibration This performs the zero calibration required to ensure accurate measurement of gas concentrations. Prepare the zero calibration gas, then connect to the product before starting zero calibration. For information on zero calibration preparation, refer to ‘7-4-1 Calibration preparation’. WARNING ...
  • Page 87 5. Usage Instructions 5-6 Performing zero calibration NOTE  If zero calibration is unsuccessful because the zero point ([20.9] (vol%) in the case of oxygen) fluctuates significantly around zero, [FAIL] is displayed before the display returns to [1-1]. If this occurs, zero calibration was not performed.

  • Page 88: Checking Settings

    5. Usage Instructions 5-7 Checking settings 5-7 Checking settings Displays the alarm settings. Item No. Setting item Remarks Setting display 1-2.0 Alarm setting display Zero follower setting ON/OFF display: Sensitivity correction ON/OFF display: 1-2.1 This is not normally used by the user. ‐...
  • Page 89 5. Usage Instructions 5-7 Checking settings ・ Second alarm setpoint display Displays the second alarm setpoint. ・ Alarm delay time Displays the alarm delay time (in seconds). ・ Zero suppression value display Displays the positive side suppression value. ・ Zero follower ON/OFF display Displays whether the zero follower setting is on or off.

  • Page 90: Shutting Down

    5. Usage Instructions 5-8 Shutting down 5-8 Shutting down To shut down product operation, turn off the power supply (24 V DC) while in detection mode. WARNING  Shutting down product operation may activate an alarm in an upstream (central) system. ...

  • Page 91: Alarm Activation

    6. Alarm Activation 6-1 Gas alarm activation Alarm Activation 6-1 Gas alarm activation 6-1-1 Alarm activation The product issues an alarm when the detected gas or oxygen concentration reaches or exceeds the alarm setpoint. (Auto reset or self-latching) NOTE  The alarm setpoints (first and second alarms) and alarm pattern (auto reset or self-latching) are set at the factory before shipping.

  • Page 92: Contact Operation (Auto Reset)

    6. Alarm Activation 6-1 Gas alarm activation 6-1-2 Contact operation (auto reset) If auto reset is set, the contacts will activate when the gas concentration reaches or exceeds the alarm setpoint. The contact operation is automatically reset when the gas concentration falls below the alarm setpoint. <Alarm pattern (H-HH)>...

  • Page 93: Contact Operation (Self-Latching)

    6. Alarm Activation 6-1 Gas alarm activation 6-1-3 Contact operation (self-latching) If self-latching is set, the contacts will activate when the gas concentration reaches or exceeds the alarm setpoint. The contact operation is automatically reset when the gas concentration falls below the alarm setpoint after resetting.
  • Page 94 6. Alarm Activation 6-1 Gas alarm activation <Alarm pattern (L-H)> Normal Alarm Reset Alarm Reset Gas concentration Reset Reset ■ ALM1 alarm lamp (red) ■ ALM2 alarm lamp (red) ■ ALM1 alarm contact ■ ALM2 alarm contact Reset Reset ■ ALM1 alarm lamp (red) ■...
  • Page 95 6. Alarm Activation 6-1 Gas alarm activation <Alarm pattern (L-LL)> (Oxygen deficiency alarm) Normal Alarm Reset Gas concentration Reset Reset ■ ALM1 alarm lamp (red) ■ ALM2 alarm lamp (red) ■ ALM1 alarm contact ■ ALM2 alarm contact Reset ■ ALM1 alarm lamp (red) ■...

  • Page 96: Alarm Response

    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 and faults occur repeatedly, contact Riken Keiki immediately. 96 / 168...

  • Page 97: Warning Operation

    6. Alarm Activation 6-3 Warning operation 6-3 Warning operation If the product ambient temperature exceeds the specified operating temperature range, the concentration readout and warning number [E-27] are displayed alternately. Gas can still be measured in this state, as this is not a product fault. The external output will also be output in the range 4 mA to 20 mA according to the target gas concentration.

  • Page 98: External Output Operation

    6. Alarm Activation 6-4 External output operation 6-4 External output operation 6-4-1 For target gases other than oxygen Mode 4 - 20 mA (output value) Power supply off 0 mA Initialization 2.5 mA setting: 2.5 mA 4 mA, HOLD, 4 - 20 mA setting: 4 mA Detection mode (no alarm) 4 - 20 mA (concentration output) Detection mode (gas alarm)
  • Page 99 6. Alarm Activation 6-4 External output operation <Gas concentration and external output example (with standard range)> <4 - 20 mA specification (maintenance output: 2.5 mA setting)> Detection mode Maintenance mode External output 20.5 mA 20 mA 4 mA 2.5 mA Gas concentration Zero suppression Full scale...
  • Page 100 6. Alarm Activation 6-4 External output operation <Gas concentration and external output example (with double range)> Two display ranges (L range and H range) are provided when using a new ceramic type sensor. The display automatically switches to the H range if the combustible gas concentration reading exceeds the full scale of the L range.
  • Page 101 6. Alarm Activation 6-4 External output operation <4 - 20 mA (H range) setting> External output Detection mode Maintenance mode 20.5 mA 20 mA Switchover point mA Full scale over 20.5 mA fixed output 4 mA 2.5 mA H range L range concentration Zero suppression...

  • Page 102: When The Target Gas Is Oxygen

    6. Alarm Activation 6-4 External output operation 6-4-2 When the target gas is oxygen Mode 4 - 20 mA (output value) Power supply off 0 mA Initialization 2.5 mA setting: 2.5 mA 4 mA, HOLD, 4 - 20 mA setting: 4 mA ※...
  • Page 103 6. Alarm Activation 6-4 External output operation CAUTION <With analog transmission (4 - 20 mA)>  The 4 - 20 mA output is already adjusted. If the full scale is exceeded, the output will not exceed 20.5 mA.  If the inhibit function is enabled or initialization is underway, the output follows the 4 - 20 mA output setting in maintenance mode.
  • Page 104 6. Alarm Activation 6-4 External output operation <Gas concentration and external output example> 0 - 25 vol% (oxygen deficiency alarm specification) External output 20.5 mA 20 mA Detection mode 17.4 mA Maintenance mode 4 mA Gas concentration Full scale Full scale over 20 mA output Suppression value 20.5 mA fixed output...

  • Page 105: Functions To Ensure Correct Alarm Activation

    6. Alarm Activation 6-5 Functions to ensure correct alarm activation 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 and humidity characteristics) and interference gases (interference characteristics), which affect the readings given by the product.

  • Page 106: Automatic Sensor Recognition Function

    6. Alarm Activation 6-5 Functions to ensure correct alarm activation 6-5-2 Automatic sensor recognition function This product features a function that automatically recognizes the sensor after a sensor is replaced or specifications have been changed. The display appears as follows to prevent incorrect mounting if a sensor with a different serial number, detection principle, or specifications is mounted: <After sensor replacement>...

  • Page 107: Maintenance

    <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 concentration and gas sampling bags.
  • Page 108 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.

  • Page 109: Maintenance Mode

    7. Maintenance 7-2 Maintenance mode 7-2 Maintenance mode Switching to maintenance mode lets you perform various tests, zero calibration, and span adjustment and configure various settings. 7-2-1 Maintenance mode setting items Item No. Setting item LED display Details Test mode Performs the gas test, alarm test, fault test, LED test, and RAM test.

  • Page 110: Switching To Maintenance Mode

    7. Maintenance 7-2 Maintenance mode Item No. Setting item LED display Details Factory mode selection This is not normally used by the user. User mode selection Switches to user mode. (Refer to ‘5-5 User mode’.) 7-2-2 Switching to maintenance mode Hold down the MENU/ESC key (for approximately three seconds) in detection mode.
  • Page 111  If the password setting is enabled, the password must be entered to access maintenance mode.  The password is set in advance by Riken Keiki. If you are unsure, contact Riken Keiki. <Switching from maintenance mode to user mode>...

  • Page 112: Performing Tests (Test Mode)

    7. Maintenance 7-3 Performing tests (test mode) 7-3 Performing tests (test mode) Test mode is used for performing various tests, such as gas tests and alarm tests. Item No. Setting item Test mode 2-0.0 Gas test 2-0.1 Alarm test 2-0.2 Fault test 2-0.3 LED test...

  • Page 113: Performing Alarm Test

    7. Maintenance 7-3 Performing tests (test mode) 7-3-2 Performing alarm test Test to check whether an alarm is triggered when the reading reaches the alarm setpoint. WARNING  Depending on the settings, contact and gas concentration outputs may be activated during alarm testing, even in maintenance mode.
  • Page 114 7. Maintenance 7-3 Performing tests (test mode) Check to confirm that an alarm is triggered. Alarm lamp (ALM1) The first alarm is triggered when the reading reaches the first alarm setpoint. The alarm lamp (ALM1) lights up (red) when the first alarm is triggered.

  • Page 115: Performing Fault Test

    7. Maintenance 7-3 Performing tests (test mode) 7-3-3 Performing fault test Test to check whether an alarm is triggered when a fault occurs in the product. WARNING  Depending on the settings, contact and gas concentration outputs may be activated during fault testing, even in maintenance mode.

  • Page 116: Performing Led Test

    7. Maintenance 7-3 Performing tests (test mode) 7-3-4 Performing LED test Perform an LED display test. Press the ▲ or ▼ key in maintenance mode several times to select [2-0], then press the SET key. Press the ▲ or ▼ key to select [2-0.3], then press the SET key.

  • Page 117: Performing Memory Test (Ram Test)

    7. Maintenance 7-3 Performing tests (test mode) 7-3-5 Performing memory test (RAM test) Perform a memory test. Press the ▲ or ▼ key in maintenance mode several times to select [2-0], then press the SET key. Press the ▲ or ▼ key to select [2-0.4], then press the SET key.

  • Page 118: Performing Calibration

    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) ...
  • Page 119 7. Maintenance 7-4 Performing calibration <Using a gas sampling bag> Product (SD-3) Calibration adapter sampling Flowmeter Pump To exhaust port Needle valve *The diagram illustrates the SD-3. The connection method for the remote sensor head (GD-3) is identical. 119 / 168...
  • Page 120 7. Maintenance 7-4 Performing calibration <Using a gas can> Product (SD-3) To exhaust port Calibration adapter <Using a gas can> Product (SD-3) Calibration adapter To exhaust port *The diagram illustrates the SD-3. The connection method for the remote sensor head (GD-3) is identical. 120 / 168...
  • Page 121 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) New ceramic type Max.
  • Page 122 7. Maintenance 7-4 Performing calibration <Using a gas can> Splash guard * The diagram illustrates the SD-3. The connection method is the same for the remote sensor head (GD-3). 122 / 168...

  • Page 123: Performing Zero Calibration

    7. Maintenance 7-4 Performing calibration 7-4-2 Performing zero calibration Gas concentrations cannot be accurately measured unless zero calibration is performed correctly. Be sure to carry out zero calibration to ensure accurate measurement. Prepare the zero calibration gas, then connect to the product before starting zero calibration. For information on zero calibration preparation, refer to ‘7-4-1 Calibration preparation’.

  • Page 124: Performing Span Adjustment

    Prepare the span adjustment gas, then connect to the product before starting span adjustment. For information on span adjustment preparation, refer to ‘7-4-1 Calibration preparation’. NOTE  Dedicated equipment is required for span adjustment. We recommend contacting Riken Keiki to request the required equipment. 124 / 168...
  • Page 125 7. Maintenance 7-4 Performing calibration <With standard range> CAUTION  Perform span adjustment after supplying the span adjustment gas (at a concentration of 1.6 times the alarm setpoint value or 40 % of full scale) and waiting for the reading to stabilize. ...
  • Page 126  If span adjustment was performed correctly or if span adjustment fails even when repeated, the gas sensor may have reached the end of its service life. Turn off the power and contact Riken Keiki. <With double range> CAUTION ...
  • Page 127  If span adjustment was performed correctly or if span adjustment fails even when repeated, the gas sensor may have reached the end of its service life. Turn off the power and contact Riken Keiki. 127 / 168...

  • Page 128: Setting Environmental Settings 1

    7. Maintenance 7-5 Setting environmental settings 1 7-5 Setting environmental settings 1 The following items can be set in environmental settings 1: Item No. Setting item Remarks Environmental settings 1 2-4.0 Inhibit setting 2-4.1 Alarm setpoint setting 2-4.2 Alarm delay setting This is not normally used by the user.

  • Page 129: Alarm Setpoint Setting

    7. Maintenance 7-5 Setting environmental settings 1 NOTE  Enabling the inhibit setting causes the LED display to alternate between [InHI.] and [0.0] (gas concentration) when in detection mode. 7-5-2 Alarm setpoint setting Set the gas alarm setpoints (first alarm setpoint and second alarm setpoint). Set each alarm setpoint within the following range: Alarm setpoint Alarm setpoint range...

  • Page 130: Date And Time Setting

    7. Maintenance 7-5 Setting environmental settings 1 7-5-3 Date and time setting Sets the date and time (year, month, date, hours, and minutes) for the internal clock. Press the ▲ or ▼ key in maintenance mode to select [2-4], then press the SET key. Press the ▲...

  • Page 131: Setting Environmental Settings 3

    7. Maintenance 7-6 Setting environmental settings 3 7-6 Setting environmental settings 3 The following items can be set in environmental settings 3: Item No. Setting item Remarks Environmental settings 3 2-6.0 Used contact setting This is not normally used by the user. 2-6.1 Energized/de-energized setting This is not normally used by the user.

  • Page 132: Double Range External Output Setting Nc

    7. Maintenance 7-6 Setting environmental settings 3 7-6-1 Double range external output setting Sets the double range external output range. (Refer to <Gas concentration and external output example (with double range)> in ‘6-3 External output operation’.) Select one of the following: ...

  • Page 133: Parts Replacement

    Activated carbon filter 1 year *1: Function checking by a certified service engineer is required after parts replacement. Contact Riken Keiki to request checking by a certified service engineer to ensure consistent operation and safety. *2: For combustible gas sensor (SI-8)/Part No.: 4283 0030 20 *3: For combustible gas sensor (CF-8304)/Part No.: 4283 0040 10...

  • Page 134: Storage, Relocation, And Disposal

    8. Storage, Relocation, and Disposal 8-1 Procedures for storage or when not in use for extended periods Storage, Relocation, and Disposal 8-1 Procedures for storage or when not in use for extended periods The product must be stored in the following environment: ...
  • Page 135 When storing or returning the product to Riken Keiki for any reason, use the packaging in which the product was shipped. If the original packaging is no longer available, wrap twice and place hard objects in the spaces within the packaging to ensure that the product will not shift inside the packaging.

  • Page 136: Procedures For Relocation Or Reuse

    CAUTION  Calibration must always be performed before resuming use of the product that has been relocated or previously stopped and stored. Contact Riken Keiki for information on readjustment procedures, including calibration. 8-3 Product disposal Dispose of the product as industrial waste (incombustible) in accordance with local regulations.

  • Page 137: Troubleshooting

    Check the wiring for the product and peripheral devices. (Disconnection, cable not connected, short circuit) Fuse blown Replacement required. Contact Riken Keiki. Internal circuit abnormality Replacement required. Contact Riken Keiki. Abnormal Disturbances due to Turn off the power and restart. If similar operation sudden noise, etc.

  • Page 138: Reading Abnormalities

    Check the cable between the main unit (SD-3SC) between the main unit and remote sensor head (GD-3). (SD-3SC) and remote sensor head (GD-3) Sensor A main unit (SD-3/ Replacement required. Contact Riken Keiki. abnormality SD-3SC) or remote sensor head (GD-3) fuse has (E-1) blown. Main unit (SD-3/SD-3SC) Replacement required.
  • Page 139 ― If similar symptoms recur frequently, the internal clock may be defective. Replace with a new internal clock. Contact Riken Keiki. Outside operating Ambient temperatures at The product operating temperature range varies temperature the location where the with the specific detection principle.

  • Page 140: Product Specifications

    SD-3 SD-3 (contact model) Specifications Standard Contact Display 7-segment LED (5 digits) Sensor F sensor (Riken Keiki) Detection principle Infrared/electrochemical/new ceramic/semiconductor/hot-wire semiconductor Detection target gas Depends on sensor specifications. Detection range Depends on sensor specifications. Sampling method Diffusion type/suction type (introduced via external unit) Set flow rate 0.4 - 1.5 L/min...
  • Page 141 10. Product Specifications 10-1 SD-3 specifications Model SD-3 SD-3 (contact model) 3-wire analog transmission (common power supply <power supply, signal, Transmission common>) or method (4 - 20 mA) 2-wire analog transmission (current source) 4 mA - 20 mA DC (non-insulated linear output) Transmission specifications Maximum load resistance 600 Ω...
  • Page 142 10. Product Specifications 10-1 SD-3 specifications <Dimensional drawings (SD-3 (model without EC barrier))> <Diffusion type> <Suction type> 142 / 168...

  • Page 143: Model With Ec Barrier)

    SD-3 SD-3 (contact model) Specifications Standard Contact Display 7-segment LED (5 digits) Sensor F sensor (Riken Keiki) Detection principle Electrochemical type Detection target Depends on sensor specifications. Detection range Depends on sensor specifications. Sampling method Diffusion type/suction type (introduced via external unit) Set flow rate 0.4 - 1.5 L/min...
  • Page 144 10. Product Specifications 10-1 SD-3 specifications Model SD-3 SD-3 (contact model) 24 V DC (18 V - 30 V DC) Power source *Use a power supply capable of minimum temporary output of 2.5 A to ensure that fuses blow normally in the event of a product abnormality. Shielded cable 1.25 sq (1.38 mm /AWG16) or 2.0 sq (2.08 mm...
  • Page 145 10. Product Specifications 10-1 SD-3 specifications <Dimensional drawings (SD-3 (model with EC barrier))> <Diffusion type> <Suction type> 145 / 168...

  • Page 146: Electrical Ratings (Sd-3)

    10. Product Specifications 10-1 SD-3 specifications 10-1-3 Electrical ratings (SD-3) Model Power supply Power consumption SD-3RI 24 V DC (18 V - 30 V DC) Max. 3.8 W SD-3GH 24 V DC (18 V - 30 V DC) Max. 4.5 W SD-3GHS 24 V DC (18 V - 30 V DC) Max.

  • Page 147: Sd-3Sc + Gd-3 Specifications

    SD-3SC + GD-3 + GD-3 Specifications Standard Contact Display 7-segment LED (5 digits) Sensor F sensor (Riken Keiki) Detection principle Infrared/electrochemical/new ceramic/semiconductor/hot-wire semiconductor Detection target gas Depends on sensor specifications. Detection range Depends on sensor specifications. Sampling method Diffusion type...
  • Page 148 10. Product Specifications 10-2 SD-3SC + GD-3 specifications SD-3SC (contact model) Model SD-3SC + GD-3 + GD-3 Shielded cable 1.25 sq (1.38 mm /AWG16) or 2.0 sq (2.08 mm /AWG14) (same as power supply cable) Transmission cable *To ensure explosion protection, use a cable designed for use in temperatures at (4 - 20 mA) least 5 °C above the maximum anticipated ambient temperature.
  • Page 149 10. Product Specifications 10-2 SD-3SC + GD-3 specifications <Dimensional drawings (SD-3SC + GD-3 (model without EC barrier))> <Diffusion type> 149 / 168...

  • Page 150: Sd-3Sc + Gd-3 (Model With Ec Barrier)

    Model SD-3SC + GD-3 + GD-3 Specifications Standard Contact Display 7-segment LED (5 digits) Sensor F sensor (Riken Keiki) Detection principle Electrochemical type Detection target gas Depends on sensor specifications. Detection range Depends on sensor specifications. Sampling method Diffusion type...
  • Page 151 10. Product Specifications 10-2 SD-3SC + GD-3 specifications SD-3SC (contact model) Model SD-3SC + GD-3 + GD-3 For 1.25 sq (1.38 mm /AWG16): Not exceeding 1.25 km Transmission For 2.0 sq (2.08 mm /AWG14): Not exceeding 2 km (with derating depending on distance (4 - 20 mA) supply voltage) Shielded twisted pair cable 1.25 sq (1.38 mm...
  • Page 152 10. Product Specifications 10-2 SD-3SC + GD-3 specifications <Dimensional drawings (SD-3SC + GD-3 (model with EC barrier))> <Diffusion type> 152 / 168...

  • Page 153: Electrical Ratings (Sd-3Sc + Gd-3)

    10. Product Specifications 10-2 SD-3SC + GD-3 specifications 10-2-3 Electrical ratings (SD-3SC + GD-3) Model Power supply Power consumption SD-3SC 24 V DC (18 V - 30 V DC) Max. 5 W GD-3RI 24 V DC (18 V - 30 V DC) Max.

  • Page 154: Detection Target Gases For Individual Detection Principles

    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) First Second Operating Operating Calibration Years of Sensor model Gas name F.S. 1 digit temperature humidity Alarm...

  • Page 155: New Ceramic Type

    10. Product Specifications 10-3 Detection target gases for individual detection principles 10-3-2 New ceramic type First Second Operating Operating Calibration Years of Sensor model Gas name F.S. 1 digit Alarm Alarm temperature humidity symbol warranty setpoint setpoint range range NCF-6318 Methane 100 %LEL 0.5 %LEL...

  • Page 156: Semiconductor Type

    10. Product Specifications 10-3 Detection target gases for individual detection principles 10-3-3 Semiconductor type First Second Operating Operating Sensor Calibration Years of Gas name F.S. 1 digit Alarm Alarm temperature humidity model symbol warranty setpoint setpoint range range SGF-8581 Methane 2,000 ppm 10 ppm 500 ppm...
  • Page 157 10. Product Specifications 10-3 Detection target gases for individual detection principles <Semiconductor type sensor warmup times> Warmup time Time turned off SGF-8581 Other SGF sensors Under 10 minutes At least 1 hours At least 30 minutes Under 1 hour At least 2 hours At least 2 hours Under 24 hours At least 4 hours...

  • Page 158: Hot-Wire Semiconductor Type

    10. Product Specifications 10-3 Detection target gases for individual detection principles 10-3-4 Hot-wire semiconductor type First Second Operating Operating Sensor Calibration Years of Gas name F.S. 1 digit Alarm Alarm temperature humidity model symbol warranty setpoint setpoint range range SHF-8601 Methane 5,000 ppm 25 ppm...
  • Page 159 10. Product Specifications 10-3 Detection target gases for individual detection principles <Hot-wire semiconductor type sensor warmup times> Warmup time Time turned off SHF-8603 Other SHF sensors Under 10 minutes At least 10 minutes At least 1 hour Under 1 hour At least 30 minutes At least 2 hours Under 24 hours...

  • Page 160: Electrochemical Type

    10. Product Specifications 10-3 Detection target gases for individual detection principles 10-3-5 Electrochemical type First Second Operating Operating Calibration Years of Sensor model Gas name F.S. 1 digit Alarm Alarm temperature humidity symbol warranty setpoint setpoint range range 20 %RH - Hydrogen ESF-A24R 100 ppm...

  • Page 161: Appendix

    11. Appendix 11-1 Detection principle Appendix 11-1 Detection principle 11-1-1 Non-dispersive infrared absorption type (Infrared type) <Sensor overview> This gas detection sensor relies on the fact that many gases absorb infrared radiation. It detects the presence of a detection target gas by irradiating a measurement cell with infrared and detecting variations caused by target gas absorption of infrared.

  • Page 162: New Ceramic Type

    This uses an ultrafine particle (new ceramic) oxidation catalyst to detect gas concentrations over a wide range, from low concentrations (ppm) up to the lower explosive limit (LEL). This revolutionary gas detection sensor was developed by Riken Keiki and specifically designed to detect combustible gases. <Sensor structure and principle>...

  • Page 163: Semiconductor Type

    11. Appendix 11-1 Detection principle 11-1-3 Semiconductor type <Sensor overview> This method detects gas concentrations from variations in resistance that occur when a metal oxide semiconductor comes into contact with the detection target gas. This general-purpose gas detector sensor is ideal for detecting a wide range of gases, from toxic gases to combustible gases.

  • Page 164: Hot-Wire Semiconductor Type

    11. Appendix 11-1 Detection principle 11-1-4 Hot-wire semiconductor type <Sensor overview> This sensor type detects gas concentrations based on variations in the resistance of a platinum coil integrated with a metal oxide semiconductor whose resistance changes when it comes into contact with a gas. The high- sensitivity low-concentration detection gas sensor is configured simply as a detecting element of metal oxide semiconductor sintered around a platinum coil.

  • Page 165: Electrochemical Type

    11. Appendix 11-1 Detection principle 11-1-5 Electrochemical type <Sensor overview> This sensor type detects a gas concentration in the form of a current generated when the detection target gas is electrolyzed on electrodes maintained at constant potential. This is the most effective gas sensor for detecting toxic gas.

  • Page 166: Terminology

    11. Appendix 11-2 Terminology 11-2 Terminology Term Definition Initialization This function prevents alarms from being issued for a while after the power is turned on. This prevents alarms from being issued, as the output from the detector fluctuates for a while after the power is turned on. Full scale The maximum value of the detection range Calibration...

  • Page 167: Product Warranty

    4. Fees will be charged for repairs in the following cases, even during the warranty period: (a) Fault or damage is attributable to incorrect use or improper repairs or modifications. (b) Fault or damage following repairs or modifications made at locations other than Riken Keiki or a service agent specified by Riken Keiki.

  • Page 168: Revision History

    11. Appendix Revision History Revision History Issue Revision details Issue date First issue 1/25/2021 Complete revision 3/15/2021 168 / 168...
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