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Troubleshooting
Troubleshooting Guide
6-6
43iQ Instruction Manual
Problem
Poor linearity
Excessive response time
Analog signal doesn't
match expected value
Possible Cause
Noise pick-up by recorder or
data logger
Problem with calibrator
Hydrocarbon kicker
Leak in sample probe line
Averaging time is not set
correctly
Instrument is not drawing in
sample at the expected
flow rate
SO
is being absorbed and
2
released by dirt in tubing or
filters of the calibration
system or contamination
inside the instrument
Contaminated bench
Software has not been
configured
Analog output goes above
Action
possible.
Check analog cable shielding
and replace.
Try to localize source of noise
by comparing analog signal to
data collected through RS-232
or Ethernet.
Verify accuracy of the
calibration system with an
independent flow meter.
Replace kicker if older than 3
years.
Check for variable dilution.
Check the "Averaging Time" in
the Settings>Measurement
Settings screen.
Check sample flow and
pressure readings 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.
Contact technical support for
additional information and
options.
Verify that the selected analog
output has been properly
configured to match the data
system.
By default, a 5% over and
Thermo Scientific
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