Troubleshooting
Troubleshooting Guide
Thermo Scientific
43iQ Instruction Manual
6-3
Problem
Possible Cause
Action
Hydrocarbon kicker has
failed
Replace the hydrocarbon kicker.
High scattered light
Toggle the “Flash Lamp” off in
the Settings>Measurement
Settings>Advanced
Settings>Flash Lamp screen. If
the previously high signal drops
to zero or less when the flash
lamp is off, the problem may be
caused by scattered light from
dust in the optical bench. If so,
carefully clean the bench.
Instrument appears to zero,
but there is weak or no
response to span gas
Span cylinder empty
Check the source pressure.
Calibration system failure
Check solenoids or other
hardware to be sure that span
gas is being delivered.
Flow rate of the diluted
span mix is adequate
Check by-pass or atmospheric
vent to verify that the zero air
system is providing more flow
than the instrument draws.
Instrument is not drawing in
span gas
Check the sample flow and
pressure in the Settings>Health
Check>Status and Alarms>Flow
and Pressure 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 on page
SO
2
is being absorbed by
tubing, filters or dirt in the
calibration system
Replace any lines made of vinyl
or plastics with fresh PTFE or
stainless steel. Replace PTFE
filter membranes that look
dirty. Remove any filters that
are not PTFE membranes.
Flash lamp has failed
Listen for the rapid clicking of
the flash lamp. Check the flash
lamp voltage and intensity.
PMT has failed
Check the PMT voltage and run
the optical span test. A good
optical span test indicates that
the PMT is OK and that the
problem is more likely the
lamp. Adjust PMT voltage if
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