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Thermo Fisher Scientific
Malfunction
Possible Cause
Problem with input board
range switching
Leak in sample probe line
Excessive response
Averaging time is not set
time
correctly.
Instrument is not drawing
in sample at normal flow
rate.
SO
2
and/or released by dirt in
the tubing or filters of the
sampling system, or inside
the instrument.
Analog signal doesn't
Software has not been
match expected
configured.
value.
Recorder is drawing down
output.
Flow meter
Dirty pump diaphragm
fluctuations
Capillary blocked
Clogged Teflon line
Action
Go to the Input Board Test screen
(Service menu) and step through each
range while the instrument samples a
known stable source of SO
Stay on the Input Board Test screen,
and while holding instrument on the
lowest gain, step the calibrator through
all SO
Manually plot signal vs. concentration
to verify linearity.
Check for variable dilution.
Go to Averaging Time (Main Menu) and
verify setting.
Check sample Flow and Pressure
readings on the Diagnostics 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 in the
"Preventive Maintenance" chapter.
is being absorbed
Replace any lines made of vinyl or other
plastics with fresh Teflon or stainless
steel.
Replace Teflon filter membranes that
look dirty.
Remove any filters that are not Teflon
membranes.
Verify that the selected analog output
has been properly configured to match
the data system.
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.
Model 43i Trace Level-Enhanced Instruction Manual
Troubleshooting
Troubleshooting Guides
.
2
levels.
2
6-7
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Troubleshooting
