ELECTRONIC PNEUMATIC CONTROLLER (EPC) LESS FLOW

Dear  Community Member,

I have facing  some issue in ELECTRONIC PNEUMATIC CONTROLLER (EPC) of GAS CHROMATOGRPAH (7890B)  The EPC Module has not give the Set Flow rate for AIR Flow, as we have give the Set Point of Air 350 ml/min, but the observed flow rate is 160 ml/min whic measure through Agilent based flow meter.  The less flow of air causing the FID turned Off and Flame not ignite.  I would like to  REVIVE the Existing Part in OPEARTION by replacement of any accessory of the said part. Our Instrument team have maintained that EPC Modules are  not completely replaced but certain parts / accessories could be change.  Kindly suggest us as what accessory need to be replaced to make this EPC Revive and Operational.

Regards

Muhammad Usman

Parents
  • First make sure that the air supplied to the GC is at a high enough pressure.  Typically for FID air it should be at least 60 psig (4 bar), maximum 120 psig (8 bar).  If that is okay, the EPC module should be replaced.  Part number for 7890 FID EPC is G3431-60831.

  • Dear Lance, 

    I have set the AIR PRESSURE at 7 Bar, there is issue in EPC flow, what our Management want is to REPAIR the said EPC Module by replacing any defective component of EPC rather to completely replace the EPC Module.

    Can you plz support and guide that which Component of EPC may be malfunctioning or which component of EPC need to be replace to revive the EPC Module. we have only issue with AIR Flow.

  • HI, it can be proportional valve for air  - G3430-67013. Also , if you have any inlets (SSL/PP etc) you can use a carrier valve from inlet EPC for test , valves the same. 

  • Very Thanks Dmbaikin,

    Currently i don't have any spare proportional value, but if the said issue is fixed by replacing the Air Proportional valve , i will procure and replace with the existing valve. Are u sure / confident that by that changing the Valve make this EPC Module Operation? If confirms by You then i proceed for Procurement. Awaiting your response.

    Regards  

Reply
  • Very Thanks Dmbaikin,

    Currently i don't have any spare proportional value, but if the said issue is fixed by replacing the Air Proportional valve , i will procure and replace with the existing valve. Are u sure / confident that by that changing the Valve make this EPC Module Operation? If confirms by You then i proceed for Procurement. Awaiting your response.

    Regards  

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