Thermo Scientific 43iQTL Instruction Manual page 177

Thermo Scientific
Problem
Detection circuit
failure
PMT failure
Flash lamp failure
Span calibration Bad span gas
coefficient outside
acceptable limits of
0.5–2.0.
System leak
Insufficient calibrator
flow
Excessive noise or Defective or low
spikes on analog sensitivity
outputs
Noise pick-up by
recorder or data logger
Poor linearity Problem with
calibrator
Hydrocarbon kicker
Leak in sample probe
line
Excessive response Averaging time is not
time set correctly
Instrument is not
drawing in sample at
the expected flow rate
Possible Cause
Check all external plumbing and the
source of the sample to verify that the
SO is not being absorbed by the
2
sampling system. Lines carrying SO
must be made from clean PTFE or
stainless steel.
Run the optical span text to verify PMT
and associated electronics.
Check the PMT voltage. Adjust if
needed.
Check the lamp voltage. Perform a
detector Autocal. If outside of spec,
replace the detector.
Verify quality of span gas.
Perform a leak test as described on
page 5-5.
Verify calibrator is providing a flow of at
least 1.5 LPM.
Check PMT voltage and run an optical
span test. Replace PMT with known-
good unit if 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).
Troubleshooting
Troubleshooting Guide
Action
2
6-5
43iQTL Instruction Manual