Riken Keiki GD-A80D Operating Manual
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Riken Keiki GD-A80D Operating Manual

Riken Keiki GD-A80D Operating Manual

Fixed combustible/toxic gas detector head
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PT2E-1874
Fixed Combustible/
Toxic Gas Detector Head
GD-A80 Series
GD-A80，GD-A80D
GD-A80V，GD-A80DV
GD-A80S，GD-A80DS
GD-A80N，GD-A80DN
Operating Manual

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  • Page 1 PT2E-1874 Fixed Combustible/ Toxic Gas Detector Head GD-A80 Series GD-A80，GD-A80D GD-A80V，GD-A80DV GD-A80S，GD-A80DS GD-A80N，GD-A80DN Operating Manual...
  • Page 2 Operating Precautions This detector is a gas detector that detects combustible or toxic gases in the air and triggers a gas alarm. The gas detector is a safety unit, not an analyzer or densitometer which performs quantitative/qualitative analysis/measurement for gases. Please fully understand the following points before using it, so that it can be used properly.

  • Page 3: Table Of Contents

    Contents 1 Outline of the Product ........................... 4 1-1. Preface ..............................4 1-2. Purpose of use ............................4 1-3. Definition of DANGER, WARNING, CAUTION and NOTE ..............4 1-4. ethod of confirmation for Standards and Explosion proof specification........... 5 2 Important Notices on Safety .......................... 6 2-1.

  • Page 4: Outline Of The Product

    1 Outline of the Product 1-1. Preface Outline of the Product 1-1. Preface Thank you for choosing our fixed combustible/toxic gas detector head GD-A80 series. Please check that the model number of the product you purchased is included in the specifications on this manual.

  • Page 5: Ethod Of Confirmation For Standards And Explosion Proof Specification

    1 Outline of the Product 1-4. Method of confirmation for Standards and Explosion proof specification 1-4. Method of confirmation for Standards and Explosion proof specification This instrument has some specification depends on standard and explosion proof certificate. Please confirm the detector specification before using. Please refer Declaration of Conformity that is at the end of this manual if you have CE marking type.You can confirm instrument specification to see name plate as follows.

  • Page 6: Important Notices On Safety

     Do not open the lid when applying current.  For the lid, use hexagon socket head bolts specified by RIKEN KEIKI.  If a scratch, crack or other abnormality is found on the container or explosion-proof structure joint surface, stop using the detector immediately and contact RIKEN KEIKI.

  • Page 7: Warning Cases

    2 Important Notices on Safety 2-2. Warning cases 2-2. Warning cases WARNING Need of grounding circuit Do not cut the grounding circuit or disconnect the wire from the grounding terminal. Defects in protective functions Before starting the detector, check the protective functions for defects. When seeming defects are found in the protective functions, such as protective grounding, do not start the detector.

  • Page 8: Precautions

    A dust filter to be used varies depending on the gas to be detected. For more information on dust filters, please contact RIKEN KEIKI. Observe the operating restrictions to prevent condensation inside the tube.* Condensation formed inside the tube causes clogging or gas adsorption, which may disturb accurate gas detection.

  • Page 9: Safty Information

    Necessary information for explosion proof construction of Model GD-A80 series. This product is diffusion gas detector which is called type GD-A80, and used in connection with indication alarm. This product also can be used as suction gas detector, type GD-A80D by attaching suction chamber. <ATEX/IECEx Specifications> Technical Data (Protection Method) Flameproof enclosure “d”...
  • Page 10 2 Important Notices on Safety 2-4. Safety Information <TIIS Specifications> Technical Data (Protection Method) Flameproof enclosure Ex d ⅡB + H2 T4 (Explosion-proof class) (Ambient Temperature) * -40C to +53C (Electrical Data) Electrical rating : GD-A80(D) DC3.0V 430mA or DC5.0V 200mA GD-A80(D)V DC6.5V 205mA or DC3.5V 350mA GD-A80(D)S...

  • Page 11: Product Components

    3 Product Components 3-1. Main unit and standard accessories Product Components 3-1. Main unit and standard accessories <Main Unit> (including a cable gland) [Diffusion type] [Front view] [Side view] Main unit Nameplate Guard Cover Hexagon socket head bolt (with drop-prevention mechanism) Sensor External...
  • Page 12 3 Product Components 3-1. Main unit and standard accessories [Suction type] [Side view] [Front view] Main unit Nameplate Cover Hexagon socket head bolt (with drop-prevention mechanism) Sensor External grounding terminal Fixing bracket Hexagon socket set screw Cable gland Cable connecting port G3/4 Unit: mm [Diffusion type and suction type] [Rear view]...

  • Page 13: How To Use

    4 How to Use 4-1. Before using the detector How to Use 4-1. Before using the detector Not only the first-time users but also the users who have already used the detector must follow the operating precautions. Ignoring the precautions may damage the detector, resulting in inaccurate gas detection. The fixed combustible/toxic gas detector head GD-A80 series is used in combination with an indicator/alarm unit that indicates a gas concentration and triggers an alarm.

  • Page 14: Precautions For System Designing

    4 How to Use 4-3. Precautions for system designing Do not install the detector in a place exposed to direct sunlight or sudden changes in the temperature. When selecting installation points, avoid a place where it is exposed to direct sunlight or radiant heat (infrared rays emitted from a high-temperature object), and where the temperature changes suddenly.
  • Page 15 4 How to Use 4-3. Precautions for system designing Take appropriate measures in accordance with the importance of the facilities and the environment.  Provide protection by a lightning arrester (cable arrester). Protection against (Although inductive lightning surge can be transmitted through the cable, it is lightning prevented by installing a lightning arrester before the field devices and central processing equipment.

  • Page 16: How To Install

    4 How to Use 4-4. How to install 4-4. How to install <Installation Dimensions> [Diffusion type] [Suction type] Unit: mm Fixing Fixing bracket bracket <Maintenance Space> (Example) Diffusion type * The same applies to the suction type. Maintenance space Maintenance space Unit: mm The following installation requirements must be met to install the detector.

  • Page 17: Installation Procedure

    WARNING  If a scratch, crack or other abnormality is found on the container or explosion-proof structure joint surface, stop using the detector immediately and contact RIKEN KEIKI. CAUTION  If it is difficult to tighten the cable gland, grease its screw part and then tighten it with the tool.
  • Page 18 4 How to Use 4-5. Installation procedure (2) Tighten the cable gland with a tightening torque of at least 30 N･m. Then tighten the hexagon socket set screw to fix the cable gland. Hexagon socket set screw M4 x 6 <Drip-proof Cover>...

  • Page 19: How To Wire

    4 How to Use 4-6. How to wire 4-6. How to wire NOTE  Before wiring, read also the operating manual of the indicator/alarm unit to be connected carefully. WARNING  Do not put a metal object or other foreign substances inside the external connection terminal box when attaching the lid.
  • Page 20 4 How to Use 4-6. How to wire inner diameter inner diameter inner diameter Washer Eccentric washer Rubber seal NOTE  The following table shows an example of overall outer diameters of cables. Use them for reference. The overall outer diameters must be checked because they somewhat vary between manufacturers. Number CVV 1.
  • Page 21 4 How to Use 4-6. How to wire (1) The numbers 3, 4, 5 and 6 are shown on the terminal plate of the detector head. Perform wiring in the correct wiring order according to the following connection diagrams. When attaching the lid of the detector head, be careful not to squeeze the cable. (To make the work easier, fasten the cable gland temporarily to the detector head.) NOTE ...
  • Page 22 NOTE  Hexagon socket head bolts with a grade of "A2-70" are used. Contact RIKEN KEIKI when the bolt is lost or replacement is necessary. WARNING  Be sure to use the bolts supplied with the unit to attach the lid of the detector head.

  • Page 23: How To Tube (* For Suction Type)

     To remove dust, never fail to attach a dust filter in the middle of the tube.  It is needed to decide the length and material of the tube. Please contact RIKEN KEIKI for more information. - 23 -...

  • Page 24: How To Operate

    5 How to Operate 5-1. Preparation for start-up How to Operate 5-1. Preparation for start-up Before connecting a power supply, read and understand the following precautions. Ignoring these precautions may cause an electric shock or damage the detector.  Check that the detector is installed properly. ...

  • Page 25: How To Exit

    5 How to Operate 5-4. How to exit 5-4. How to exit Turn off the power switch of the indicator/alarm unit. WARNING  When the detector is turned off, an alarm may be triggered on the upper (central) system.  Before turning off the detector, INHIBIT (point skip) on the upper (central) system must be activated.

  • Page 26: Maintenance

    6 Maintenance 6-1. Maintenance intervals and items Maintenance The detector is an important instrument for the purpose of safety. To maintain the performance of the detector and improve the reliability of safety, perform a regular maintenance. Continuing to use the detector without performing maintenance will compromise the sensitivity of the gas sensor, thus resulting in inaccurate detection.
  • Page 27 To maintain the safety operation of the detector, please use our maintenance service.  Typical maintenance services are listed as follows. For more information, please contact RIKEN KEIKI. Main Services Power supply Checks the power supply voltage.

  • Page 28: Calibration Method

    6 Maintenance 6-2. Calibration method 6-2. Calibration method Perform a calibration with the indicator/alarm unit (zero adjustment/span adjustment mode) using the calibration gas.  Zero adjustment gas  Calibration gas (collected in a gas sampling bag)  Gas sampling bag for exhaust gas [Suction type] [Diffusion type] Exhaust...
  • Page 29 Check that the model of replacement for the gas sensor agrees with the model shown on the sensor model label attached to the detector head. NOTE  The span adjustment requires dedicated tools. We recommend the adjustment be performed by RIKEN KEIKI. - 29 -...

  • Page 30: Replacement Parts

    Cable inlet NOTE  After the sensor is replaced, the voltage, zero and span adjustments must be performed. We recommend the sensor replacement be performed by RIKEN KEIKI. WARNING  Do not replace the sensor while it is energized. Doing so may cause ignition, thus leading to dangers.
  • Page 31 The operation must be checked after replacement by our service engineer. For the stable operation of the detector and safety, ask our service engineer to take care of replacement of the part. Request RIKEN KEIKI for operation check. NOTE ...

  • Page 32: Storage, Relocation And Disposal

    When using a relocated or stopped/stored detector again, never fail to perform a calibration. For information on readjustment including a calibration, Please contact RIKEN KEIKI. 7-3. Disposal of products When the detector is disposed of, it must be treated properly as an industrial waste in accordance with the local regulations.

  • Page 33: Troubleshooting

    If the detector shows a symptom which is not explained in this manual, or still has malfunctions even though remedial actions are taken, please contact RIKEN KEIKI. <Abnormalities of Readings>...
  • Page 34 8 Troubleshooting Improper calibration Use the proper calibration gas. gas concentration Span adjustment impossible Deteriorated sensor Replace the sensor with a new one. sensitivity - 34 -...

  • Page 35: Product Specifications

    9 Product Specifications 9-1. Standard specifications Product Specifications 9-1. Standard specifications [Diffusion type]＜ATEX/IECEx Specifications＞ Model GD-A80 GD-A80V GD-A80S GD-A80N Detection Catalytic combustion Hot-wire Semiconductor Thermal conductivity principle or new ceramic semiconductor Gas to be Combustible gases Combustible/toxic Combustible/toxic Combustible gases in detected in the air gases in the air...
  • Page 36 9 Product Specifications 9-1. Standard specifications [Suction type] ＜ATEX/IECEx Specifications＞ Model GD-A80D GD-A80DV GD-A80DS GD-A80DN Detection Catalytic combustion Hot-wire Semiconductor Thermal conductivity principle or new ceramic semiconductor Gas to be Combustible gases Combustible/toxic Combustible/toxic Combustible gases in detected in the air...
  • Page 37 9 Product Specifications 9-1. Standard specifications [Diffusion type]＜TIIS Specifications＞ Model GD-A80 GD-A80V GD-A80S GD-A80N Detection Catalytic combustion Hot-wire Semiconductor Thermal conductivity principle or new ceramic semiconductor Gas to be Combustible gases Combustible/toxic Combustible/toxic Combustible gases in detected in the air gases in the air gases in the air the air/inert gas...
  • Page 38 9 Product Specifications 9-1. Standard specifications [Suction type] ＜TIIS Specifications＞ Model GD-A80D GD-A80DV GD-A80DS GD-A80DN Detection Catalytic combustion Hot-wire Semiconductor Thermal conductivity principle or new ceramic semiconductor Gas to be Combustible gases Combustible/toxic Combustible/toxic Combustible gases in detected in the air...

  • Page 39: Detection Principle

    9 Product Specifications 9-2. Detection principle 9-2. Detection principle <Catalytic Combustion> When a combustible gas burns on the surface of an oxidation catalyst, the catalytic combustion type sensor considers resultant combustion heat as temperature and resistance changes in the platinum wire coil, and measures their gas concentrations.
  • Page 40 9 Product Specifications 9-2. Detection principle <New Ceramic Type> When a combustible gas burns on the surface of a highly active new ceramic oxidation catalyst in catalytic combustion, the new ceramic-type sensor measures resultant temperature changes by measuring the resistance changes in the heat-resistant alloy wire coil. The sensor consists of two elements: A detecting element having a heat-resistant alloy wire coil with an ultrafine particle (new ceramic) oxidation catalyst sintered on it together with a carrier and a temperature-compensating element with a mixture of gas-inert alumina and glass sintered on it.
  • Page 41 9 Product Specifications 9-2. Detection principle <Hot-wire Semiconductor> The hot-wire semiconductor type sensor detects a change in resistance of the platinum wire coil integrated in a metal oxide semiconductor whose resistance value changes by contact with a gas as gas concentration. This is a highly sensitive gas detection sensor suitable for low concentrations.

  • Page 42: Definition Of Terms

    10 Definition of Terms Definition of Terms Catalytic This is a principle of the sensor installed in GD-A80(D). combustion type See "9-2. Detection principle" for details. This is a principle of the sensor installed in GD-A80(D). New ceramic See "9-2. Detection principle" for details. This is a principle of the sensor installed in GD-A80(D)V.
  • Page 43 10 Definition of Terms 9-2. Detection principle - 43 -...

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