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Troubleshooting

Troubleshooting Chart

Problem Possible Cause Refer to page:

No signal Main or filament power switch off 4

Filament temperature too low 4

Fuse blown 3

Output cable in the wrong connector 14

Signal reversed Signal wires reversed 14

Noisy signal Dirty system or leaking fittings 7, 13, 19

Bad flow controller in system 15

Cell/filament differential too small 15

Filament damaged 2

Cannot zero the signal Recorder/Int. not zeroed 16

Voltage incompatibility 14

Main or filament power switch off 4

Excessive drift* Block temperature not stabilized 15

Heater fault 17

Cell doesn’t heat properly Heater/sensor cable unplugged/

heater fail safe mechanism 17

Heater fault 17

Fuse blown 3

For technical assistance from Valco Instruments, call (713) 688-9345 or email [email protected].

*Try referenced mode, page 12

Heater Fault Determination

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.

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