Chromatography Forum

Dear All,
We are using Varian(now bruker) GC-450for Natural gas analysis, there is a prblem in air pressure(EFC11) which is stable at start of test but gradually decrease & results in turned off Flame of FID. i have checked the Leakage but did't find any leakage. please help me to sort out the problem.

It sounds as if the air supply to the instrument is inadequate - check the pressure at the cylinder, and make sure that the supply line is not obstructed, and that there are not excessive volumes being taken off elsewhere.

Peter

other GC of same brand using the common supply of air shows no problem(300ml/min)

other GC of same brand using the common supply of air shows no problem(300ml/min)

Probably a faulty EPC then, time for a service call.

Peter

thanks sir for your promt reply