FID Analog Filter

Issue

A customer has several Focus GC with FID operating with Chromquest software.
The customer operates one Focus GC in the mode of analog filter range 1 and one Focus GC at an analog filter range of 100 as the samples have high concentrations.
The baseline on two of the systems has drifted down and is now around 0.0 millivolts (mV).
The customer is currently running with a ignition threshold of 0.0 mV and the FID remains ignited.
I discussed this issue with another Technical Support Representative and they indicated this is a common issue when using Analog filters and to overcome the issue the ignition threshold is set to 0.0 mV .
The customer is using Chromquest as the software, and this will also be an issue with Chromeleon and Xcalibur.

The only solution is to run with threshold set to 0.0.
User can confirm that GC is working by removing the analog filter and confirming the signal is around 2-7 mV.