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Thermo Fisher Scientific
Malfunction
Table 6–3. Troubleshooting - Measurement Failures
Malfunction
Possible Cause
Reduced response or
Undefined electronic
no response to
failure or pump failure
sample gas with
alarm(s) indicated.
Instrument is not drawing
in sample as expected.
Reduced response or
Instrument is not drawing
no response to
in sample as expected.
sample gas with no
alarms indicated.
Possible Cause
Action
and released by dirt in
other plastics with fresh Teflon or
the tubing or filters of
stainless steel. Replace Teflon filter
the calibration system,
membranes that look dirty. Remove
or contamination inside
any filters that are not Teflon
the instrument.
membranes.
Averaging time is not
Check the Averaging Time in Main
set correctly.
Menu. If too high, the unit will be
slow to stabilize. If too low, the
signal may appear noisy.
PMT high voltage power
Check the PMT high voltage power
supply failure
supply voltage. This voltage should
be about -600 volts (violet wire is
positive).
Flasher lamp
Replace with known good lamp to
see if the lamp is the problem.
Action
Check alarm screens and the diagnostic
voltage screen to localize fault.
Check the response to known span gas.
Run an optical span test.
Check sample Flow and Pressure
readings on the Diagnostics screen.
Use an independent flow meter to
check flows at the sample inlet and
exhaust bulkheads (they should match).
Perform a leak test, as described in the
"Preventive Maintenance" chapter.
Check sample Flow and Pressure
readings on the Diagnostics screen.
Use an independent flow meter to
check flows at the sample inlet and
exhaust bulkheads (they should match).
Perform a leak test, as described in the
"Preventive Maintenance" chapter.
Check the external plumbing for leaks or
other problems.
Model 43i Trace Level-Enhanced Instruction Manual
Troubleshooting
Troubleshooting Guides
6-5
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Troubleshooting
