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The output on the FPD+ detector is vey erratic. Today it could read 100 and the next it will read 1100 and I can not find the problem. I have a 7890 GC. Thanks

Question asked by boperator on Dec 31, 2019
Latest reply on Jan 2, 2020 by james_jenkins

I have two 7890 GC configured the same. Both use the same gas supplies. The output on GC #2 is 28 and is as stable as can be. So I know it is not the gases. I have replaced the detector board and two pressure controller valves. I cannot find any leaks. I can open the oven door on GC #1 and the out put will swing wildly. I can open the oven door on GC #2 and the output is extremely stable. Any suggestions? Thanks.

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