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Troubleshooting
Troubleshooting Guide
6-4
43iQ Instruction Manual
Problem
Zero or Span will not
stabilize
Reduced response or no
response to sample gas
with alarm(s) indicated
Possible Cause
Flow rate of the diluted
span mix is inadequate
Instrument is not drawing in
span gas
SO
is being absorbed and
2
released by dirt in tubing or
filters of the calibration
system or contamination
inside the instrument
Averaging time is not
correct
Flasher lamp
Undefined electronic failure
or pump failure
Instrument is not drawing in
sample as expected
Action
needed.
Check the by-pass or
atmospheric pressure vent to
verify that the zero air system
is providing more flow than the
instrument is drawing.
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 5-5.
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.
Check the "Averaging Time" in
the Settings>Measurement
Settings screen. If too high, the
unit will be slow to stabilize. If
too low, the signal may appear
to be noisy.
Replace with known-good lamp
to see if the lamp is the
problem.
Check the status and alarms
screen to localize fault.
Check the response to known
span gas.
Run an optical span test.
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).
Thermo Scientific
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