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7.MEASURES AT ABNORMAL CASE 

 
 
7−1.Responding to trouble alarm 

If this detector founds defective, contact RIKEN KEIKI. 

 
 
7−2.Before it is thought to be a trouble 

 
 

  ・Check the wirings around the related instruments as well as this detector head. 

 

It may be caused by improper operation. 

  ・Re-check the detection system and contact RIKEN KEIKI. 

 
 
 
 

8.DEFINITION OF TERMS 

 
 
  Galvanic cell 

Galvanic cell type oxygen sensor that produces a current proportional to the oxygen content 
permeated through the membrane.    Refer to  「10. DETECTION PRINCIPLE」  for details. 

 
  Zener barrier 

Safety  retainer  for  explosion  protection  by  limiting  the  energy  of  electric  current  within  a 
non-ignition level. 

 
  CVVS 

This is a kind of connecting cable between indicator/alarm unit and oxygen detector head. 
CVVS means a “Polyethylene insulated and vinyl sheathed control cable with shield”. 

 
  Calibration 

By  using  standard  (calibration)  gas,  adjust  gas  reading  in  indicator/alarm  unit  to  match  the 
calibration gas concentration.   

 

It may be caused by cable disconnection, short circuit, etc. 

Summary of Contents for GD-F4A-1

Page 1: ...ion for accidents and damage caused by using this product The indemnification shall be made only under the warranty policy of products or parts replacement Because this is a safety unit a regular main...

Page 2: ...tector head 2 Alarm level for gas alarm instrument shall be set within the performance of the instrument Our standard alarm level is 18 by volume for the prevention of oxygen deficiency 3 This is not...

Page 3: ...aution at piping works 10 Example of piping connection 10 HOW TO OPERATE Preparation for start up 12 How to start the detector head 12 How to exit 12 MAINTENANCE Maintenance intervals and items 13 Cal...

Page 4: ...tor alarm unit to show oxygen content Read the operating manual for indicator alarm unit as well as this manual This unit is designed as drip proof construction for outdoor installation Also it can be...

Page 5: ...interval Do not change or remodel the circuit structure of this unit Do not disassemble the sensor since there is a electrolyte inside If your finger touches the electrolyte wash your finger away with...

Page 6: ...3 PRODUCT COMPONENTS External drawing Cable inlet Cable inlet Sensor Gas inlet Protective ground Gas outlet For U bolt Cable inlet Sensor Gas inlet Protective ground Gas outlet For U bolt...

Page 7: ...yed terminal for sensor lead and external cable Cable gland Entrance to lead the cable 8 11mm from outside Hinge Hinge for front door Lock Lock for front door Mounting hole Mounting hole to fix this u...

Page 8: ...ormance division and group Performance division ia Group C 3 Relations between allowable inductance Lo and allowable capacitance Co of intrinsic safety circuit and external wiring inductance Lw and ca...

Page 9: ...inside detector head Drip proof housing Sensor lead Terminal strip Cable gland Shielded cable Oxygen sensor Gas inlet Gas outlet Detector head Indicator alarm unit Non hazardous area Non hazardous ar...

Page 10: ...to get direct rays of the sun Places closed to high temperature and or emission of electromagnetic wave Place with vibration or shocks Place where the mounting part is weak and it is easy to come out...

Page 11: ...t full lengths Cable O D 8 11mm Example of cable connection 1 In case of non explosion proof system Lead the applicable cable through cable inlet and connect to the terminal strip Connect the other si...

Page 12: ...or alarm unit and be specified that it is for power interruption of indicator alarm unit Ground the zener barrier separately corresponding to the A class grounding with ground resistance of 10 or less...

Page 13: ...G Use 8 O D 1t copper pipe and so on for piping Carry out piping works as straight as possible Excessively high load may cause burden on the suction pump shortening the effective life of the pump When...

Page 14: ...hen the pump cannot be used If the sample gas pressure would fluctuate use the constant flow rate control valve to keep the constant flow rate Exhaust the sampled gas to open air in principle When mak...

Page 15: ...ead sampled gas to 1 0L 0 3mL min Be sure to perform gas calibration at the time of new installation Correct reading may not be obtained before gas calibration How to exit Stop the sample gas supply t...

Page 16: ...is also necessary to carry out gas calibration at least every 6 months The law in Japan sets forth that the unit must issue an alarm during the circuit maintenance related to alarm while providing no...

Page 17: ...ag for calibration and confirm that the oxygen reading returns to 20 9vol Return disconnected piping to where they were completion of zero adjustment Performing a span adjustment Pack the span gas fre...

Page 18: ...at the top of terminal strip and disconnect two lead black and white wires Loosen the screw for sensor stopper and take off the sensor stopper Pull out the sensor upward from the holder Insert new sen...

Page 19: ...temperature 5 10 Environment of low oxygen content Put a sensor into the container and seal off the container List of recommendable spare parts for regular replacement No Name of parts Inspection fre...

Page 20: ...rent proportional to the oxygen content permeated through the membrane Refer to 10 DETECTION PRINCIPLE for details Zener barrier Safety retainer for explosion protection by limiting the energy of elec...

Page 21: ...Cable entry Cable gland Applicable cable O D 8 11mm Piping connection Rc 1 8 8 1t Provided with coupling Operating temperature 10 40 Operating humidity Below 90 RH Non condensing Structure Wall mount...

Page 22: ...base metal electrodes immersed in an electrolyte with a lead wire an electrochemical cell is formed A membrane covers the cell and allows oxygen to diffuse into the electrolyte at a rate proportional...

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