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Instruction Manual
7.4.2 Inspecting the sensor (Pirani Filament)
In the event of a fault or a complete failure of the output signal, the sensor can easily be checked.
Tools / Material Required
• Voltmeter / ohmmeter
• Allen wrench, AF 2
• Spare sensor (if the sensor is faulty)
If the cause of a fault is suspected to be in the sensor, the following checks can be made with an ohmmeter.
Separate the sensor from the electronics unit and use an ohmmeter to make the following measurements on
the contact pins.
Sensor
PCM301
40 ± 1 [Ω]
All of the above conditions can only be remedied by replacing the sensor.
InstruTech
Ω
Possible cause
>>40
Contamination
<<40
Contamination
Pirani Filament broken
PCM301 Busy Bee
Page 28
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