Riken Keiki GD-F88Ai Operating Manual
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Riken Keiki GD-F88Ai Operating Manual

Riken Keiki GD-F88Ai Operating Manual

2-wire gas detector head
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PT2E-1941
2-Wire Gas Detector Head
GD-F88Ai
Operating Manual
(PT2-194)

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Summary of Contents for Riken Keiki GD-F88Ai

  • Page 1 PT2E-1941 2-Wire Gas Detector Head GD-F88Ai Operating Manual (PT2-194)

  • Page 2: Table Of Contents

    Contents 1. Outline of the Product ............................. 1 1-1. Preface ..............................1 1-2. Purpose of use ............................1 1-3. Definition of DANGER, WARNING, CAUTION and NOTE ..............1 2. Important Notices on Safety ........................... 2 2-1. Danger cases ............................2 2-2.

  • Page 3: Outline Of The Product

    1-1. Preface Outline of the Product 1-1. Preface Thank you for choosing our 2-wire gas detector head GD-F88Ai. Please check that the model number of the product you purchased is included in the specifications on this manual. This manual explains how to use the detector head and its specifications. It contains information required for using the detector head properly.

  • Page 4: Important Notices On Safety

    It can be used in a location where a combustible or explosive gas, or steam is present; however, it should be done carefully. Consult RIKEN KEIKI before operating the detector head in such a location.  External connection Before connecting the detector head to the external control circuit, securely connect it to a protective grounding circuit.

  • Page 5: Precautions

    2. Important Notices on Safety 2-3. Precautions WARNING  Handling of sensor Do not disassemble the sensor unit because it contains electrolyte. If contact occurs, rinse the area immediately with a large quantity of water.  Calibration When performing calibration for the detector head, be careful of loose tubes, etc. to prevent personnel from contacting gases.

  • Page 6: Important Information About Explosion-Proof

    2. Important Notices on Safety 2-5. Important information about explosion-proof 2-5. Important information about explosion-proof The detector head is an explosion-proof product. The following provides information about the explosion-proof structure. Understand the information in this section thoroughly before using the detector head. ...
  • Page 7 The detector head contains a battery for sensor backup. Observe the followings to maintain explosion-proof performance. <Usable battery> Only the following battery can be used. Contact RIKEN KEIKI if it is difficult to purchase the battery. Type: AAA alkaline dry battery...

  • Page 8: Product Components

    3. Product Components 3-1. Main unit and standard accessories Product Components 3-1. Main unit and standard accessories <Main Unit> (1) LCD display : Displays the gas concentration. (Used at maintenance) (2) MODE switch : Switches the mode from the detection mode to maintenance mode. Or exits the maintenance mode.

  • Page 9: Names And Functions For Each Part

    3. Product Components 3-2. Names and functions for each part 3-2. Names and functions for each part (10) (11) (7) Power switch : Turns ON/OFF the power of the unit. (8) Sensor : Detects a gas. (9) Terminal plate : Connects the power cable.

  • Page 10: How To Use

    4. How to Use 4-1. Before using the detector head How to Use 4-1. Before using the detector head Not only the first-time users but also the users who have already used the detector head never fail to follow the operating precautions. Ignoring the precautions may damage the detector head, resulting in inaccurate gas detection.

  • Page 11: Precautions For System Designing

    4. How to Use 4-3. Precautions for system designing Do not install the detector head in machinery which is not properly grounded. Before installing the detector head in machinery, the machinery must be grounded properly. Do not install the detector head in a place where interference gases exist around it. The detector head must not be installed in a place where interference gases exist around it.

  • Page 12: How To Install

    4. How to Use 4-4. How to install 4-4. How to install A certain maintenance space needs to be secured in advance to allow the maintenance personnel to safely and properly perform maintenance of the gas detector function and performance. Be sure to secure this space during construction planning or installation.

  • Page 13: Grounding

    4. How to Use 4-5. Grounding 4-5. Grounding Connect the the detector head to your grounding terminal with the internal or external terminal. WARNING Before turning on the detector head, never fail to connect it to a grounding terminal. Internal grounding terminal (M4) External grounding...

  • Page 14: Wiring

    4. How to Use 4-6. Wiring 4-6. Wiring CAUTION  Be careful not to damage the internal electronic circuit when wiring.  The connected cables must not be installed together with the motor power cables, etc.  When stranded wires are used, prevent wires from contacting each other. 4-7.

  • Page 15: System Connection Example

    4-8. System connection example 4-8. System connection example 4-8-1. Example of connecting to indicator, DCS, PLC, etc. (non-explosion-proof system) Upper unit (DCS, PLC) Non-hazardous location GD-F88Ai detector 4-8-2． Example of connecting to Zener Barrier, indicator, DCS, PLC, etc. Non-hazardous location Hazardous location...
  • Page 16 4-8-3． Example of connecting to Zener Barrier and indicator Non-hazardous location Hazardous location OX-5002 Zener Barrier A type grounding GD-F88Ai detector 4-8-4. Example of connecting to insulating barrier, indicator, DCS, PLC, etc. Non-hazardous location Hazardous location Upper unit (DCS, PLC)

  • Page 17: 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 unit.  Check that the detector head is installed properly. ...

  • Page 18: How To Start The Detector Head (Power-On)

    5. How to Operate 5-3. How to start the detector head (power-on) CAUTION The regular maintenance mode is used by a qualified service engineer. Do not operate the mode unless instructed to do so. 5-3. How to start the detector head (power-on) ...

  • Page 19: Modes

    5. How to Operate 5-4. Modes 5-4. Modes Details on each mode are provided as follows. CAUTION  Do not change the settings if not necessary. Changing the settings without understanding the specifications may cause malfunctions. Mode Item Details display Detection Mode Normal state concentration...

  • Page 20: Description Of Operation (Detection Mode)

    5. How to Operate 5-5. Description of operation (detection mode) 5-5. Description of operation (detection mode) 5-5-1. Display operation The operation status of the detector head is displayed on the LCD. Preparation Power-on LCD display - - - - Initial clear (approx. 25 seconds) Detection mode 20.9 In the detection mode, the sampling gas...
  • Page 21 5. How to Operate 5-5. Description of operation (detection mode) Fault Display If a fault occurs on the detector, the fault detail is displayed on the LCD. (LCD display) (Fault detail) System abnormalities Sensor not connected/Sensor disconnection NOTE See "8. Troubleshooting" for remedial actions to fault display. 5-5-2．...

  • Page 22: Description Of Operation (Maintenance)

    5. How to Operate 5-6. Description of operation (maintenance) 5-6. Description of operation (maintenance) 5-6-1. Maintenance mode Enter the maintenance mode to perform each adjustment. Holding down the MODE switch for three seconds in the detection mode enters the maintenance mode. Holding down the MODE switch for three seconds in the maintenance mode returns to the detection mode.
  • Page 23 5. How to Operate 5-6. Description of operation (maintenance) 5-6-2. Fresh air adjustment This is used to perform the fresh air adjustment. NOTE If the zero calibration failed since the zero point was significantly fluctuated from around zero, or by other reasons, it returns to 1-1 after FAIL rather than PASS is displayed.
  • Page 24 5. How to Operate 5-6. Description of operation (maintenance) 5-6-3. External output test This is used to check the transmission status by outputting a signal equivalent to gas concentration to the external device. WARNING Before starting the external output test (transmission test), provide a notification to the related sections so that they can prepare for false abnormalities.

  • Page 25: How To Exit

    5. How to Operate 5-7. How to exit 5-7. How to exit To turn off the detector head, turn off the power switch located on the left side of the power terminal plate. Then, turn off the power supply (24 VDC) to the detector head. WARNING Decide whether the power can be turned off by checking the operation of the devices connected to the external output of the detector head head before turning it off.

  • Page 26: Maintenance

    Our qualified service engineers have expertise, knowledge and other information on the dedicated tools used for services, along with other products. To maintain the safety operation of the detector head, please use our maintenance service.  Typical maintenance services are listed as follows. Please contact RIKEN KEIKI for more information. - 24 -...

  • Page 27: Replacement Parts

    * Check and adjustment are performed at the indicator/alarm unit side. 6-2. Replacement parts <Replacement of Gas Sensor> Our service engineers need to replace and adjust the sensor. Please contact RIKEN KEIKI. NOTE  If adjustment to the standard gas concentration value fails even with the maximum sensitivity, it indicates that the gas sensor has come to the end of its life.

  • Page 28: Storage, Relocation And Disposal

    When using a relocated or stopped/stored detector head 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 head is disposed of, it must be treated properly as an industrial waste in accordance with the local regulations.

  • Page 29: Troubleshooting

     The sensor has not been connected, or poor connection of the connector occurs.  Check that the sensor is attached and that the sensor is attached securely to the connector. If the situation does not improve, contact RIKEN KEIKI. - 27 -...

  • Page 30: Product Specifications

    9. Product Specifications Product Specifications 9-1. List of specifications ＜Oxygen Deficiency Alarm) SPECIFICATION＞ Model GD-F88Ai Detection principle Galvanic cell method Gas to be detected Concentration display 7-segment LCD (4 digits) Detection range 0～25vol% Detection method Diffusion type Alarm preset point 18vol%(1st<L>)【Standard】...
  • Page 31 9-1. List of specifications Material SECC or SS304 Paint Bake-coated with melamine Outer color Munsell 2.5Y9/2 ＜Gas minitoring SPECIFICATION＞ Model GD-F88Ai Detection principle Galvanic cell method Gas to be detected Concentration display 7-segment LCD (4 digits) Detection range 0～5vol%/0～10vol%/0～25vol% Detection method...

  • Page 32: Detection Principle

    10. Definition of Terms 9-2. Detection principle 9-2. Detection principle Galvanic cell type A negative electrode of noble metal and a positive electrode of lead are placed in a resin container filled with electrolyte. A part of the container is opened and covered with a barrier. The negative electrode is installed in contact with the barrier.

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