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GC-FPD failure

tctsead

Hello, I am using a GC-FPD with a sulfur filter. The machine has not been used for months and I have been restarting it this week. However there is a huge problem for FPD to ignite, the output is only ~1.0 with 0.5/1.0/2.0 offset. It was ~40 before with the flame being easily lit but now there is no water dripping from the exhaust hose so I suspect the flame is not on with the 1.0 output. 

Is there any possible solution for this case? Have tried heating and allowed air to flow for few days before lighting it. 

At the same time, I have read the FPD maintenance manual from Agilent. 

I spot that there might be a problem with the eletrometer or the signal cable. Is eletrometer same as PMT voltage? If so, our PMT is always on. Where is the signal cable and how could I find it? 

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    It's possible you may just have air in the hydrogen lines after a period of non-use.  If nothing else has changed since it was running OK it may just take a little while for the normal flow rate to once again get pure undiluted hydrogen to the FPD.

    Then it might ignite OK.

    Also remember most FPDs are very sensitive to total gas flow, including carrier.  The position of the flame in front of the photomultiplier must be consistent or the response will not be, and changes in inert gas flow during a run can move the flame a bit so it might not be exactly where it was when calibrated.

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  • 0

    It's possible you may just have air in the hydrogen lines after a period of non-use.  If nothing else has changed since it was running OK it may just take a little while for the normal flow rate to once again get pure undiluted hydrogen to the FPD.

    Then it might ignite OK.

    Also remember most FPDs are very sensitive to total gas flow, including carrier.  The position of the flame in front of the photomultiplier must be consistent or the response will not be, and changes in inert gas flow during a run can move the flame a bit so it might not be exactly where it was when calibrated.

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