Troubleshooting
Troubleshooting Guides
6-2
Model 48
i
Instruction Manual
Thermo Fisher Scientific
Table 6–2
lists all the alarm messages you may see on the graphics display
and provides recommendations about how to resolve the alarm condition.
Table 6–1.
Troubleshooting - General Guide
Malfunction
Possible Cause
Action
Does not start (the light on
display does not come on
and the pump motor is not
running)
No power or wrong power
configuration
Check the line to confirm
that power is available and
that it matches the voltage
and frequency configuration
of the instrument.
Main fuse is blown or
missing
Unplug the power cord, open
the fuse drawer on the back
panel, and check the fuses
visually or with a multimeter.
Bad switch or wiring
connection
Unplug the power cord,
disconnect the switch and
check operation with a
multimeter.
Pressure transducer does not
hold calibration or is noisy
Pressure transducer
defective
Replace pressure transducer.
Run output noisy
Recorder noise
Replace or repair recorder.
Sample CO concentration
varying
Run instrument on a span CO
source - if quiet, there is no
malfunction.
Foreign material in optical
bench
Clean optical bench.
Analyzer does not calibrate
properly
System leak
Find and repair leak.
Pressure or temperature
transducer out of calibration
Recalibrate pressure and
temperature transducer.
Dirty system
Clean cells and flow
components.
Leaky correlation wheel
Replace with a known good
wheel.
Analog test ramp
Faulty recorder
Replace recorder.
D/A calibration off
Re-calibrate the D/A with a
DMV known to be in
calibration.
