by
AICMM » Fri Oct 07, 2022 3:16 pm
Marye,
As pointed out by rb6banjo, since you have manual flow controllers, it will be difficult to find the proper flows after the flame is lit by trying to adjust the controllers. I would suggest a different approach.
If this is not a shared GC, ie it has its own regulator for air and hydrogen, then put a mark on the air regulator at the current pressure. Then reduce this pressure by 30 - 40% or so and try to re-light the FID. If it lights, then slowly increase the air regulator back up to its original pressure. If it is a shared GC you should consider a regulator for the air pressure directly upstream of this GC and try the same process.
The comments about more hydrogen relative to the air are appropriate BTW and a hotter detector lights easier than a colder detector.
Finally, I would ask, is this being lit by a glow plug and if so, a glow plug permanently attached to the FID detector or one that is hand held like the old PE. Reason I ask is that I have found the solution to Agilent FID's not lighting and was wondering if PE's are configured the same way.
Best regards,