flame photometric detector has low signal

I have a 6890N gc with 2 FPD detectors.  One detector has low sesitibity.  Maybe it needs a new O ring for the ignitor?


I checked the flows comming out of the derectors.  The make up gas was set to 60 but my flowmeter read 30.

I snooped around with a helium leak detector and found one of the detectors has a leak somewhere inside of it.


I swapped the 2 colums ( I use a 2 hole injection port ferrule) and got the same low results on my 2nd FPD so I  think my problem is with the detector.

Maybe I need to use different flow rates?



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