Thermo Scientific 43iQ, Instruction Manual

Page: 174 / 284

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