Troubleshooting
Troubleshooting Guide
6-6
43iQHL Instruction Manual
Thermo Scientific
Problem
Possible Cause
Action
Excessive response time
Averaging time is not
set correctly
Check the “Averaging Time” in the
Settings>Measurement Settings
screen.
Instrument is not
drawing in sample at
the expected flow rate
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
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.
Contaminated bench
Contact technical support for
additional information and options.
Analog signal doesn’t
match expected value
Software has not been
configured
Verify that the selected analog
output has been properly
configured to match the data
system.
Analog output goes
above full-scale value
or below zero
By default, a 5% over and under
range on the analog outputs is
provided. If this is not desirable
due to system restrictions, it may
be turned off in the
Settings>Communications>Analog
I/O screen.
Recorder is drawing
down output
Verify that the recorder or data
logger input impedance meets
minimum requirements.
Flow meter fluctuations
Dirty pump diaphragm
Clean or replace pump diaphragm.
Capillary blocked
Clean or replace capillary.
Clogged PTFE line
Inspect all sample lines.
Alarm – Chamber
Temperature
Heater failed
Replace heaters as needed.
Summary of Contents for 43iQHL
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