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Troubleshooting
Troubleshooting Chart
Problem
No signal
Signal reversed
Noisy signal
Cannot zero the signal
Excessive drift*
Cell doesn't heat properly
For technical assistance from Valco Instruments, call (713) 688-9345 or email tech_usa@vici.com.
*Try referenced mode, page 12
Heater Fault Determination
Possible Cause
Main or filament power switch off
Filament temperature too low
Fuse blown
Output cable in the wrong connector
Signal wires reversed
Dirty system or leaking fittings
Bad flow controller in system
Cell/filament differential too small
Filament damaged
Recorder/Int. not zeroed
Voltage incompatibility
Main or filament power switch off
Block temperature not stabilized
Heater fault
Heater/sensor cable unplugged/
heater fail safe mechanism
Heater fault
Fuse blown
The heater control circuit is designed to disable itself in the event of a fault
such as over-temperature, shorted heater, short/open temperature sensor,
etc. Once disabled, circuit operation is restored by turning off the controller,
disconnecting and reconnecting the detector cable, and then turning the
controller back on. E.g. , if mains power is applied before the detector is
connected to the controller, the heater circuit will not operate until mains
power is removed, the detector connected, and mains power restored.
Under normal circumstances, the amber temperature indicator light will flash
once after mains power is applied, before control is established. If the light
fails to flash, it indicates that a fault has been detected or (less likely) the
heater supply fuse has failed.
Refer to page:
4
4
3
14
14
7, 13, 19
15
15
2
16
14
4
15
17
17
17
3
17
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