Galvanic Applied Sciences AccuChrome MA2963, Operation Manual

Page: 116 / 145

Revision 4 103 12/15/2018
10.2 Potential Faults
10.2.1 Baseline Issues
Problem Cause Corrective action
High Baseline TCD Excitation board
baseline signal is set too high
Halt the analyzer, open the
column oven, and adjust the
screw marked ‘Baseline’ on
the potentiometer on the
electronics board inside the
oven until the baseline reads
lower. If the baseline
continues to drift upwards
after 24 hours, check the next
troubleshooting tip.
There is a leak Check all fittings inside and
outside the oven. Tighten up
any loose fittings. If the
problem persists, disassemble
the valve (as shown in Section
15), and clean or replace the
valve.
Baseline is unstable There is a leak Check all fittings. Ensure that
helium pressure is stable at
60 psig.
Temperature in the column
oven is unstable.
Allow the temperature to
stabilize inside the oven for 24
hours prior to carrying out
another analysis.