Thermo Scientific 43iQTL Instruction Manual page 175

Thermo Scientific
Problem
Instrument appears to Span cylinder empty
zero, but there is weak
or no response to span
gas
Calibration system
failure
Flow rate of the
diluted span mix is
adequate
Instrument is not
drawing in span gas
SO
by tubing, filters or dirt
in the calibration
system
Flash lamp has failed
PMT has failed
Zero or Span will not Flow rate of the
stabilize diluted span mix is
inadequate
Instrument is not
drawing in span gas
Possible Cause
Lamp screen. If the previously high
signal drops to zero or less when the
flash lamp is off, the problem may be
caused by scattered light from dust in
the optical bench. If so, carefully clean
the bench.
Check the source pressure.
Check solenoids or other hardware to be
sure that span gas is being delivered.
Check by-pass or atmospheric vent to
verify that the zero air system is
providing more flow than the instrument
draws.
Check the sample flow and pressure 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.
is being absorbed Replace any lines made of vinyl or
2
plastics with fresh PTFE or stainless
steel. Replace PTFE filter membranes
that look dirty. Remove any filters that
are not PTFE membranes.
Listen for the rapid clicking of the flash
lamp. Check the flash lamp voltage and
intensity.
Check the PMT voltage and run the
optical span test. A good optical span
test indicates that the PMT is OK and
that the problem is more likely the lamp.
Adjust PMT voltage if needed.
Check the by-pass or atmospheric
pressure vent to verify that the zero air
system is providing more flow than the
instrument is drawing.
Check the sample flow and pressure 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
Troubleshooting
Troubleshooting Guide
Action
6-3
43iQTL Instruction Manual