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Instruction Manual
Service
5
5.1 Calibration
Every InstruTech CVG101 gauge is calibrated prior to shipment using nitrogen (N
the instrument by adjusting zero and span (atmosphere), using the controller which is operating the gauge.
Zero and span (atmosphere) calibration affect the displayed value and the output signal. Zero calibration
optimizes performance of the gauge when operating at a low pressure range of 1 x 10
your minimum operating pressure is higher than 1 x 10
at zero and thus span calibration should be adequate. If you are able to evacuate your system to below 1 x 10
Torr, it is always a good practice to check and set zero if necessary. This will also improve performance in cases
where gauge contamination is causing higher readings than 1 x 10
evacuated to below 1 x 10
5.2 Maintenance
In general, maintenance is not required for your InstruTech gauge. Periodic performance checks may be done
by comparing the gauge to a known reference standard.
5.3 Troubleshooting
Indication
Readings appear very different from
expected pressure
Readings are noisy or erratic
Gauge cannot be calibrated - zero and
span can't be adjusted
Controller displayed pressure is too high
and cannot be set to correct value
Controller displayed pressure is too low
and cannot be set to correct value
InstruTech, Inc.
-4
Torr. Care should be exercised when using gases other than nitrogen (N
Possible Cause
The process gas is different from the
gas used to calibrate the CVG101
Gauge has not been calibrated or has
been calibrated incorrectly
Loose cables or connections
Contamination
Vibration
Contamination
Sensor failure for other cause
Contamination
Sensor wire damaged
Sensor wire damaged
Contamination
-3
Torr, it is not normally necessary to perform calibration
-4
Torr, even though the system has been
Possible Solution
Correct readings for different gas thermal
conductivity. See controller User Manual
Check that zero and span are adjusted
correctly. See controller User Manual
Check and tighten connections
Inspect gauge for signs of contamination
such as particles, deposits, discoloration
on gauge inlet. Return to factory for
possible cleaning
Ensure gauge is not mounted where
excessive vibration is present
Return to factory for possible cleaning
Return to factory for evaluation or replace
Return to factory for possible cleaning
Return to factory for evaluation or replace
Return to factory for evaluation or replace
Return to factory for possible cleaning
CVG101 Worker Bee
). However, you can calibrate
2
-4
-3
Torr to 1 x 10
Torr. If
) / air.
2
-4
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