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2 Important Notices on Safety   

2-5. Important information about explosion-proof 

 

 

 

- 8 -

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Important information about explosion-proof (continued) 

 

 Power 

supply 

Never fail to use the following safety maintaining device (barrier) to maintain explosion-proof 
performance. 

 

Ratings to maintain safety 

Intrinsically safe circuit maximum voltage (

U

o) :  28 

Intrinsically safe circuit maximum current (

I

o) : 

 

93 

mA 

Intrinsically safe circuit maximum power (

P

o) : 

 

0.65 

 

Performance classification and group 

Performance classification  :    ia 
Group : 

 

IIC 

 

Relations between the intrinsically safe circuit allowable inductance (

L

o) and intrinsically safe 

circuit external wire inductance (

Lc

) and between the intrinsically safe circuit allowable capacitance 

(

C

o) and intrinsically safe circuit external wire capacitance (

Cc

Intrinsically safe circuit allowable inductance (

L

o) = (

Lc

) or more 

Intrinsically safe circuit allowable capacitance (

C

o) = 586 pF + (

Cc

) or more 

 

 Wiring 

Determine the cable type to use and laying distance in consideration of the above parameters to 
maintain explosion-proof performance. 
Perform wiring so that a current or voltage that disturbs intrinsically safe explosion-proof 
performance of the intrinsically safe circuit is not induced to the circuit due to electromagnetic or 
electrostatic induction. 

 

 Battery 

The detector contains a battery for sensor backup. Observe the followings to maintain explosion-
proof performance. 
<Usable battery> 

Type 

: AAA alkaline dry battery 

Model : 

LR03 

Nominal voltage  : 1.5 V 

<Battery Replacement> 

Turn off the power of the detector before replacing the battery. 
Never fail to use the dedicated battery storage case. 

 

 Grounding 

Never fail to ground the detector (D type grounding). 

 

 Others 

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. (See 
Specifications) 

Содержание GD-K88Di

Страница 1: ...PT2E 1975 2 Wire Gas Detector Head GD K88Di Operating Manual PT2 197...

Страница 2: ...ecommended cables and terminal plate specifications 16 4 8 System connection example 17 4 9 How to Tube 19 5 How to Operate 21 5 1 Preparation for start up 21 5 2 Basic operating procedures 21 5 3 How...

Страница 3: ...anual 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 curren...

Страница 4: ...y 2 1 Danger cases 4 2 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 ov...

Страница 5: ...maintaining device used separately 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 suc...

Страница 6: ...e membrane is deteriorated by solvents thus causing an electrolyte leak from its inside Do not use solvents near the detector If a solvent is used for unavoidable reasons attach the recommended filter...

Страница 7: ...pplied standard Recommended Practices for Explosion Protected Electrical Installations in General Industries JNIOSH TR 46 1 2015 JNIOSH TR 46 6 2015 Electrical parameter Intrinsically safe circuit all...

Страница 8: ...e cable type to use and laying distance in consideration of the above parameters to maintain explosion proof performance Perform wiring so that a current or voltage that disturbs intrinsically safe ex...

Страница 9: ...2 MODE switch Switches the mode from the detection mode to maintenance mode Or exits the maintenance mode 3 SET switch Used to set the mode during the maintenance mode 4 5 UP DOWN switch Used to selec...

Страница 10: ...3 Product Components 3 1 Main unit and standard accessories 10 Standard Accessories Filter Dust filter CF 8350 Attached when the gas to be detected is CO carbon monoxide CF 8364...

Страница 11: ...the battery for sensor backup 9 Power switch Turns on off the power of the unit 10 Sensor Detects a gas 11 Terminal plate Connects the power cable 12 Grounding terminal A terminal M4 to ground the uni...

Страница 12: ...high voltage devices exist Do not place the detector next to a noise source device Do not run cables in parallel or close to each other Do not install the detector in a place where maintenance of the...

Страница 13: ...ures against lightning If cables are installed outside the factory plant or if internal cables are installed in the same duct as the cables coming from outside the factory plant lightning will cause p...

Страница 14: ...heck that the main unit is mounted securely on the wall If not the main unit may fall off and cause unexpected injury or damage to the unit Do not install the detector in a place where maintenance of...

Страница 15: ...grounding terminal For stable operation of the detector and safety it must be connected to a grounding terminal Never connect the grounding wire to a gas pipe The grounding must be made as D type grou...

Страница 16: ...the signal current value 4 to 20 mA When wiring the detector check the following to make sure that the voltage at the terminal plate is appropriate The detector provides stable operation within the po...

Страница 17: ...ecting to indicator DCS PLC etc non explosion proof system 4 8 2 Example of connecting to Zener Barrier indicator DCS PLC etc GD K88Di detector Host system DCS PLC Non hazardous location GD K88Di dete...

Страница 18: ...4 Example of connecting to insulating barrier indicator DCS PLC etc 5 4 6 3 Short circuit between 3 and 4 EC 5002 EC 592 GD K88Di detector Zener Barrier Hazardous location A type grounding Non hazardo...

Страница 19: ...ate required for the detector is 500 cc min or more Consult RIKEN KEIKI for pumps aspirators etc that draw gases externally 3 Tube material Some gases to be detected have highly adsorptive or corrosiv...

Страница 20: ...sampling flow rate 1 Check required flow rate Turn the needle gradually to the left Check that the FLOW is over the upper line If not adjust an external pump etc 2 Adjust flow rate Turn the needle so...

Страница 21: ...l output may be fluctuated during adjustment Take an appropriate measure to avoid the influence on the gas monitoring system Make sure to use a fuse with the specified ratings to prevent fire Check th...

Страница 22: ...l Clear approx 25 seconds System check of the unit External output 4 0 mA Power switch CAUTION Do not turn off the detector during the initial clear The detector is reading the internal memory during...

Страница 23: ...ironmental setting 2 4 Used for various environmental settings 2 4 0 2 4 1 INHIBIT Setting 2 4 2 Alarm Setpoint Setting 2 4 3 Alarm Delay Time Setting 2 4 4 Alarm Pattern Setting 2 4 5 Zero Suppressio...

Страница 24: ...Detection mode LCD display Example Gas to be detected CO In the detection mode the sampling gas concentration is displayed on the LCD Normal display description Detected gas concentration Name of the...

Страница 25: ...el 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 Fault Display If a...

Страница 26: ...ends on the gas concentration 2 Initial clear 4 0 mA 3 Maintenance mode 4 0 mA or lower 4 External output test 4 0 20 0 mA varies with the test value 5 Fault state 3 5 mA 6 Power off 0 0 mA The follow...

Страница 27: ...e If the maintenance mode is left unoperated for 10 hours the detection mode automatically returns 4 0 20 0 mA 4 0 mA The maintenance mode consists of Daily Maintenance and Regular Maintenance and Dai...

Страница 28: ...nu displayed Introduce a zero adjustment gas When the reading is stabilized press the SET switch The display blinks and zero adjustment is performed 3 Press the SET switch to confirm the setpoint When...

Страница 29: ...n the SET switch while is displayed enters the regular maintenance mode 4 Press the SET switch while 2 0 is displayed to display 2 0 1 Alarm Test Then make a selection with the SET switch 5 Increase t...

Страница 30: ...ower 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 of...

Страница 31: ...orm maintenance once or more for every six months to maintain the performance as a safety unit Maintenance item Maintenance content Daily mainte nance Monthly mainte nance Regular mainte nance Status...

Страница 32: ...ro adjustment if the display is incorrect External alarm test Inspect the alarm circuit by using the alarm test function Check the alarm lamps Check the activation Check the external alarm Check the a...

Страница 33: ...ration in the maintenance mode 2 In the atmospheric air press the SET switch and confirm that the order in which it is displayed is CAL NOTE If the zero adjustment failed since the zero point was sign...

Страница 34: ...ce the reading was significantly fluctuated from the introduced gas concentration it returns to 2 2 after FAIL rather than PASS is displayed In this case the span adjustment has not been completed Che...

Страница 35: ...body using the reverse procedure to the above NOTE The gas calibration using the standard gas is required after the sensor is replaced Please make a request to RIKEN KEIKI If adjustment to the standa...

Страница 36: ...6 months 3 8 years 430 mm 4253 9330 10 Battery Assy 1 Replaced together with the gas sensor The operation must be checked after replacement by a qualified service engineer For the stable operation of...

Страница 37: ...use it again When the detector is relocated select a new place in accordance with 4 2 Precautions for installation sites and 4 4 How to install For information on wiring work see 4 6 How to wire and 4...

Страница 38: ...e filter and insulation transformer Cable abnormalities open circuit not connected short circuit Check the wiring of detector and related devices around it Abnormal operations Disturbances by sudden s...

Страница 39: ...ther abnormalities at the detection point Presence of interference gas It is difficult to eliminate interference gases such as solvents completely Please contact RIKEN KEIKI to arrange removal filters...

Страница 40: ...e Trouble alarm indication content display Trouble alarm action Non latching Transmission method 2 wire analog transmission digital transmission HART Communication Transmission specifications 4 20mADC...

Страница 41: ...ent generated at that time 10 10 Definition of Terms Electrochemical type This is a principle of the sensor installed in the detector head See 9 2 Detection principle for details Initial clear Output...

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