Riken Keiki GD-K88Ai Operating Manual
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Riken Keiki GD-K88Ai Operating Manual

2-wire gas detector head
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PT2E-1935
2-Wire Gas Detector Head
GD-K88Ai
Operating Manual
(PT2-193)

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Summary of Contents for Riken Keiki GD-K88Ai

  • Page 1 PT2E-1935 2-Wire Gas Detector Head GD-K88Ai Operating Manual (PT2-193)

  • Page 2: Table Of Contents

    <Contents> 1. Outline of the Product ......................3 1-1. Preface ............................ 3 1-2. Purpose of use ........................3 1-3. Definition of DANGER, WARNING, CAUTION, and NOTE ............ 4 2. Important Notices on Safety ....................5 2-1. Danger cases .......................... 5 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-K88Ai. 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 and its specifications. It contains information required for using the detector properly.

  • Page 4: Definition Of Danger, Warning, Caution, And Note

    1 Outline of the Product 1-3. Definition of DANGER, WARNING, CAUTION, and NOTE 1-3. Definition of DANGER, WARNING, CAUTION, and NOTE This message indicates that improper handling may cause serious damage on DANGER life, health or assets. This message indicates that improper handling may cause serious damage on WARNING health or assets.

  • Page 5: Important Notices On Safety

    2 Important Notices on Safety 2-1. Danger cases Important Notices on Safety 2-1. Danger cases DANGER This detector is the intrinsically safe explosion-proof product with Zener Barrier. However, never attempt to detect a gas over the lower explosive limit. - 5 -...

  • Page 6: Warning Cases

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

  • Page 7: Precautions

    2 Important Notices on Safety 2-3. Precautions 2-3. Precautions CAUTION  Do not use a transceiver near the detector. Radio wave from a transceiver or other radio wave transmitting device near the detector or its cables may disturb readings. If a transceiver or other radio wave transmitting device is used, it must be used in a place where it disturbs nothing.

  • Page 8: 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 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. ...
  • Page 9 Confirm that no combustible gas is present around before opening the door of the unit. Never disassemble or modify the unit. Manufacturer: RIKEN KEIKI Co., Ltd. 2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744 Japan www.rikenkeiki.co.jp *1: The temperature range to maintain explosion-proof performance The temperature range to maintain gas detection performance is 0 to +40°C.

  • Page 10: Product Components

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

  • Page 11: 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 <Front View of Detector Unit> (10) (11) (12) Battery box Houses the battery for sensor backup. Power switch Turns ON/OFF the power of the unit. Sensor Detects a gas.

  • Page 12: 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 alarm system must follow the operating precautions. Ignoring the precautions may damage the alarm system, resulting in inaccurate gas detection. - 12 -...

  • Page 13: Precautions For Installation Sites

    4 How to Use 4-2. Precautions for installation sites 4-2. Precautions for installation sites CAUTION  This is a precision device. Because the detector may not provide the specified performance in some places (environments), check the environment in the installation point, and then take appropriate actions if necessary.

  • Page 14: Precautions For System Designing

    4 How to Use 4-3. Precautions for system designing 4-3. Precautions for system designing CAUTION An unstable power supply and noise may cause malfunctions or false alarms. The descriptions in this section must be reflected on the designing of a system using the detector. Using a stable power supply The external output and alarm contact of the detector may be activated when the power is turned on, when momentary blackout occurs, or while the system is being stabilized.

  • Page 15: 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 16: Grounding

    4 How to Use 4-5. Grounding 4-5. Grounding Connect the detector to your grounding terminal with the internal or external terminal. WARNING Before turning on the detector, never fail to connect it to a grounding terminal. Internal grounding terminal (M4) External grounding terminal (M4) For stable operation of the detector and safety, it must be connected to a grounding terminal.

  • Page 17: How To Wire

    4 How to Use 4-6. How to wire 4-6. How to wire 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. ...

  • Page 18: 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) Non-hazardous location Host system (DCS, PLC) GD-K88Ai detector 4-8-2. Example of connecting to Zener Barrier, indicator, DCS, PLC, etc. Hazardous location Non-hazardous location...
  • Page 19 4-8-3. Example of connecting to Zener Barrier and indicator Hazardous location Non-hazardous location EC-5002/EC-592 Short circuit between (3) and (4). Zener Barrier A type grounding GD-K88Ai detector 4-8-4. Example of connecting to insulating barrier, indicator, DCS, PLC, etc. Hazardous location Non-hazardous location Upper unit (DCS, PLC)

  • Page 20: 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 21: How To Start The Detector (Power-On)

    5 How to Operate 5-3. How to start the detector (power-on) CAUTION The regular maintenance mode is used by a qualified service engineer. 5-3. How to start the detector (power-on)  Before supplying power to the detector, check that the preparation for start-up is completed. ...

  • Page 22: 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 LED display Details Detection mode Normal state...

  • Page 23: 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 is displayed on the LCD. Preparation Power-on LCD display (Example: Gas to be detected: CO) Initial clear (approx.
  • Page 24 5 How to Operate 5-5. Description of operation (detection mode) Negative value display The "-0" display is shown when the zero level drops to the negative (-) side by 10% or more of the full scale. WARNING Accurate gas detection cannot be performed with the negative value display. In this case, perform zero adjustment.
  • Page 25 5 How to Operate 5-5. Description of operation (detection mode) 5-5-2. External output operation 4 – 20 mA transmission (1) Signal transmission method : Electric current transmission (non-isolated) (2) Transmission path CVVS 2c 1.25 sq (3) Transmission distance 1000 m or less 300 Ω...

  • Page 26: 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 27 5 How to Operate 5-6. Description of operation (maintenance) 5-6-2. Zero adjustment This is used to perform the zero adjustment. NOTE  If the zero calibration failed since the zero point was significantly fluctuated from zero, or by other reasons, it returns to 1-1 after FAIL is displayed. In this case, the zero adjustment has not been completed.
  • Page 28 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 alarm.

  • Page 29: How To Exit

    5 How to Operate 5-7. How to exit 5-7. How to exit To turn off the detector, 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. WARNING Before turning off the detector, decide whether the power can be turned off by checking the operation of the devices connected to the external output of the detector.

  • Page 30: Maintenance

    Our qualified service engineers have expertise and knowledge on the dedicated tools used for services, along with other products. To maintain the safety operation of the unit, please use our maintenance service.  Typical maintenance services are listed as follows. Please contact RIKEN KEIKI for more information. - 30 -...
  • Page 31 6 Maintenance 6-1. Maintenance intervals and items Main services Power supply Checks the power supply voltage. check Status display Check that the status indicates normal measurement state. check Concentration Verifies that the concentration display value is zero by using the zero gas. display check* Performs zero adjustment if the display is incorrect.
  • Page 32 6 Maintenance 6-3. Gas calibration method 6-3. Gas calibration method Perform a calibration in each mode (zero adjustment mode and span adjustment mode) using the calibration gas. <Zero Adjustment "2-1"> This is used to perform the zero adjustment. WARNING When the zero adjustment is performed in the atmosphere, check the atmosphere for freshness before beginning the adjustment.
  • Page 33 If there are mistakes, perform the span adjustment again. If the span adjustment cannot be performed even when there is no mistake or after recalibration, the gas sensor life might have expired. After turning off the power supply, please contact RIKEN KEIKI. - 33 -...

  • Page 34: Replacement Parts

    6 Maintenance 6-2. Replacement parts 6-2. Replacement parts <Replacement of Gas Sensor> To replace the gas sensor, use the following procedure. 1. Open the door of the main unit, loosen the two anti-removal screws and remove the sensor part. Do not allow contact between the amplifier board and the door screw mounting part.
  • Page 35 For the stable operation of the detector and safety, ask a qualified service engineer to take care of replacement of the parts. Request the operation check from RIKEN KEIKI. NOTE In the case where the wireless energization time of the device is a total of more than half a year, the battery replacement for the sensor may be empty.

  • Page 36: Storage, Relocation And Disposal

    CAUTION When using detector again after relocation or long-term storage, 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 37: 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 on Unit>...
  • Page 38 Drifting of sensor Perform zero adjustment. output It is difficult to eliminate interference gases, such as Presence of solvents completely. Please contact RIKEN KEIKI to interference gas The reading rises arrange removal filters. (drops) and does not go A very small amount of the gas to be detected may be back.

  • Page 39: Product Specifications

    9 Product Specifications Product Specifications 9-1. List of specifications Model GD-K88Ai Detection principle Electrochemical type Gas to be detected Toxic gases Concentration display 7-segment LCD (4 digits) Detection range Depends on the gas to be detected Detection method Diffusion method...

  • Page 40: Detection Principle

    10 Definition of Terms 9-2. Detection principle 9-2. Detection principle An electrochemical type sensor electrolyzes a gas directly while maintaining the interface between electrode and electrolyte at a constant potential (bias voltage). A gas is electrolyzed by an electrolysis cell to which a certain potential (bias voltage) is applied, and the gas is detected from the electrolytic current generated at that time.

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