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Troubleshooting
Troubleshooting Guide
Thermo Scientific
42iQHL Instruction Manual
6-3
Problem
Possible Cause
Action
Defective cooler
Check temperature (less than -2
°
C at T
amb
= 25
°
C).
Non-linear response
Incorrect calibration
source
Verify accuracy of multipoint
calibration source gas.
Leak in sample probe line Check for variable dilution.
Excessive response time
Partially blocked sample
capillary
Unplug power cord. Clean or
replace capillary.
Hang up/blockage in
sample filter
Change element.
Improper converter
operation
Questionable calibration
gas
Verify accuracy.
Converter
temperature
too high or too low
Temperature should be 625
°
C for
stainless steel.
Low line voltage
Check to see if line voltage is
within specifications.
Alarm – Instrument
Temperature
Fan failure
Replace fan if not operating
properly.
Dirty fan filter
Clean or replace filter.
Overheating PCB
Locate defective PCB reporting
the error and replace if needed.
Alarm – Bench
Temperature
Heaters failed
Replace heaters as needed.
Defective PCB
Replace PCB.
Alarm – Cooler Temp
Sensor
Check fan operation
Replace defective fan.
Check fan filter
Clean or replace filter.
Bad thermistor
Replace thermistor.
Alarm – NO
2
Converter
Temperature
Converter temperature
low
Stainless steel converter should
be hot to the touch. If not, the
heater may have failed. Check
that converter temperature
setpoint is approximately 625
°
C.
Alarm – Pressure
High pressure indication
Check plumbing for leaks.
Check the pump for a tear in the
diaphragm.
Replace if needed.
Check the capillary is properly
installed and o-rings are in good
shape.
Alarm – Flow
Flow low
Check sample capillary for
blockage. Replace as necessary.
Summary of Contents for 42iQHL
Page 1: ...42iQHL Instruction Manual High Level NO NO2 NOx Analyzer 119018 00 27Sep2018 ...
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