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Thermo Scientific
Problem
Flow meter fluctuations
Alarm – Chamber
Temperature
Alarm – Perm Gas Temp
Alarm – Pressure
Alarm – Flow
Possible Cause
full-scale value or below
zero
Recorder is drawing down
output
Dirty pump diaphragm
Capillary blocked
Clogged PTFE line
Heater failed
Defective PCB
Incorrect Perm oven set
temperature or alarm
setting
Perm oven heater
thermistor or gas thermistor
error
Perm oven failure
High pressure indication
Flow low
Flow high
Troubleshooting
Troubleshooting Guide
Action
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>Ana
log I/O screen.
Verify that the recorder or data
logger input impedance meets
minimum requirements.
Clean or replace pump
diaphragm.
Clean or replace capillary.
Inspect all sample lines.
Replace heaters as needed.
Replace PCB.
Check that the alarm settings
match the set temperature.
Replace thermistor.
Replace the Perm oven.
Check plumbing for leaks.
Check the pump for a tear in
the diaphragm. Replace if
needed.
Check that the capillary is
properly installed and o-rings
are in good shape.
Check sample capillary for
blockage. Replace as
necessary.
If using sample particulate
filter, make sure it is not
blocked. Disconnect sample
particulate filter from the
sample bulkhead. If flow
increases, replace the filter.
Perform a leak test as decribed
on page 5-5.
When delivering zero air or gas
to the instrument, use an
43iQ Instruction Manual
6-7
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