Thermo 48i, Instruction Manual

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Troubleshooting
Troubleshooting Guides
6-2 Model 48 i Instruction Manual Thermo Electron Corporation
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 power
switch 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 Recalibrate the D/A with a
DVM known to be in
calibration.