Agilent 7890A GC unable to reach set pressure
Posted: Tue Jun 04, 2019 2:34 am
Hello everyone
I am working with an Agilent 7890A GC. The main problem is that the inlet (split/splitless) is unable to reach any set pressure and remains extremely low and shuts off after a few minutes. Initially, the total flow (50 mL/min) is usually able to reach the set flow but it never works more than a few minutes.
The carrier gas is helium and I have checked extensively for leaks with a helium detector. I have also tried swapping out the EPC with no success.
Gas saver is off
I’ve put my thumb over the split vent exhaust, no change in pressure.
I have also performed a SS Inlet Pressure Decay Test, the pressure does not hold, however, I am unable to find leaks.
Any help is appreciated, Thank you
I am working with an Agilent 7890A GC. The main problem is that the inlet (split/splitless) is unable to reach any set pressure and remains extremely low and shuts off after a few minutes. Initially, the total flow (50 mL/min) is usually able to reach the set flow but it never works more than a few minutes.
The carrier gas is helium and I have checked extensively for leaks with a helium detector. I have also tried swapping out the EPC with no success.
Gas saver is off
I’ve put my thumb over the split vent exhaust, no change in pressure.
I have also performed a SS Inlet Pressure Decay Test, the pressure does not hold, however, I am unable to find leaks.
Any help is appreciated, Thank you