2-Wire Gas Detector Head

1 PT2-1930 2-Wire Gas Detector HeadGD-K88Ai Operating Manual (PT2-193) Part Number: 71-0415 Revision: P1 Released: 1/25/17<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. Warning cases ..6 2- 3. Precautions ..7 2- 4. Operating precautions ..7 2- 5. Important information about explosion-proof ..8 3. Product Components .. 10 3- 1. Main unit and standard accessories .. 10 3- 2. Names and functions for each part .. 11 4. How to Use .. 12 4- 1. Before using the Detector .. 12 4- 2. Precautions for installation sites .. 13 4- 3. Precautions for system designing .. 14 4- 4. How to install .. 15 4- 5. Grounding .. 16 4- 6. How to wire .. 17 4- 7. Compatible cables and terminal plate specifications .. 17 4- 8.

2 System connection example .. 18 5. How to 20 5- 1. Preparation for start-up .. 20 5- 2. Basic operating procedures .. 20 5- 3. How to start the Detector (power-on) .. 21 5- 4. Modes .. 22 5- 5. Description of operation (detection mode) .. 23 5- 6. Description of operation (maintenance) .. 26 5- 7. How to exit .. 29 6. Maintenance .. 30 6- 1. Maintenance intervals and items .. 30 6- 2. Replacement parts .. 32 7. Storage, Relocation and Disposal .. 33 7- 1. Procedures to store the Detector or leave it for a long time .. 33 7- 2. Procedures to relocate the Detector or use it again .. 33 7- 3. Disposal of products .. 33 8. Troubleshooting .. 34 9. Product Specifications .. 36 9- 1. List of specifications .. 36 9- 2. Detection 37 10. Definition of Terms .. 38 - 2 -1 Outline of the Product1- 1. Preface1 Outline of the Product 1- 1. PrefaceThank you for choosing our 2-Wire gas Detector head GD-K88Ai.

3 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. Not only the first-time users but also the users who have already used the product must read and understand the operating manual to enhance the knowledge and experience before using the Detector . When the Detector is used in combination with an indicator/alarm unit, read also the operating manual of the indicator/alarm unit. 1- 2. Purpose of use This Detector is a fixed type gas Detector head which detects combustible and toxic gases. When the Detector detects gas leakage, it outputs a current according to the gas indicator/alarm unit indicates the gas concentration and triggers an alarm if a preset concentrationlevel is exceeded. The Detector is a safety unit, not an analyzer or densitometer which performs quantitative/qualitativeanalysis/measure ment for gases.

4 Please fully understand the features of the Detector before using it,so that it can be used 3 -1 Outline of the Product 1-3. Definition of DANGER, WARNING, CAUTION, and NOTE 1-3. Definition of DANGER, WARNING, CAUTION, and NOTE DANGER This message indicates that improper handling may cause serious damage on life, health or assets. WARNING This message indicates that improper handling may cause serious damage on health or assets. CAUTION This message indicates that improper handling may cause minor damage on health or assets. NOTE This message indicates advice on handling. - 4 - 2 Important Notices on Safety 2-1. Danger cases - 5 - 2 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 2 Important Notices on Safety 2-2. Warning cases 2-2. Warning cases WARNING Power supply Before turning on the Detector , always check that the voltage is properly applied. Need of grounding circuit Do not cut the grounding circuit inside or outside the Detector or disconnect the wire from the grounding terminal. In both of the cases, the Detector will be in danger. Defects in protective functions When seeming defects are found in the protective functions, such as protective grounding, do not start the Detector . Before starting the Detector , check the protective functions for defects. Grounding Zener Barrier Arrange A type grounding for Zener Barrier. Operation in a gas The Detector employs the intrinsically safe explosion-proof structure (Zener Barrier used separately). It can be used in a location where a combustible gas, or steam is present; however, it should be done carefully.

6 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. Handling of sensor Do not disassemble the sensor unit because it contains electrolyte. If contact occurs, rinse the area immediately with water. Calibration When performing calibration for the Detector , be careful not to lack calibration gases by loosing tubes. Response to gas detection When a gas is detected, it indicates a potentially dangerous situation. Take proper actions based on your judgment. - 6 - 2 Important Notices on Safety 2-3. Precautions 2-3. Precautions 2-4. Operating precautions This Detector is a gas Detector that detects combustible and toxic gases in the air and outputs gas concentration signals. The gas Detector is a safety unit, not an analyzer or densitometer which performs quantitative/qualitative analysis/measurement for gases.

7 Please fully understand the following points before using it, so that it can be used properly. 1. The Detector may be interfered by gases other than the gas to be detected, solvents, vapors etc. Please note that the gas concentration signal may be fluctuated by interference. In addition, it may be fluctuated by environmental (temperature, humidity, etc.) changes in the installation site. 2. The alarm must be set within a range where the performance of the Detector can be ensured. In facilities compliant with the High Pressure Gas Safety Act, an alarm setting below our standard alarm setpoint (threshold limit value) may trigger a false alarm. 3. This is a safety unit, not a control unit. Use the analog signal output of the Detector for an indicator or external recorder. If these outputs are used to control other units, we shall not be responsible for any malfunctions. 4. Because the contact point of the gas Detector sensor is made of porous polymeric membrane, the water repellency of the membrane is deteriorated by solvents, thus causing an electrolyte leak from its inside.

8 Do not use solvents near the Detector . If a solvent is used for unavoidable reasons, attach the recommended filter to the areas such as inlet of the gas Detector while using the solvent and for one hour after that. 5. For maintenance of the Detector , it must go through a regular maintenance, including replacement and adjustment of the regular replacement parts as specified in the operating manual. In addition, because this is a safety unit, it is recommended that a regular maintenance and a calibration are performed every six months in accordance with the regulations. 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. To restart the Detector , wait for five seconds or longer before switching on Detector .

9 Restarting the Detector within five seconds may cause errors. Careful consideration should be given to instrumentation to maintain safety even when a trouble like disconnection of power/signal cable or unexpected malfunction or failure occurs. This is an electrical appliance. Be careful that it may be affected, in rare cases, by power supply noises, static electricity and electromagnetic noises. Before using the Detector in an environment with such noises, provide for protective measures against them. - 7 - 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 . Explosion-proof structure and class The Detector employs the following explosion-proof structure and class.

10 Use the Detector according to the operating environment. Explosion-proof structure : Intrinsically safe explosion-proof structure Explosion-proof class : ExiaIICT4X Certificate number : Certification body : Technology Institution of Industrial Safety Applied standard : Recommended Practices for Explosion-Protected Electrical Installations in General Industries Electrical parameter Intrinsically safe circuit allowable voltage (Ui) : 28 V Intrinsically safe circuit allowable current (Ii) : 93 mA Intrinsically safe circuit allowable power (Pi) : W Internal capacitance (Ci) : 586 pF Internal inductance (Li) : Negligible value Operating temperatures : -20 - +50 C (*1) Protective class of case : IP20 (Water-proof: None/Dust-proof: Up to mm foreign solid material protected) Insulation performance : Meet JIS standard (between the power supply and case, 500 VAC, one minute) under the condition that the capacitor connected to the terminal plate has been removed.