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• Pressure display does not indicate a constant value.
Possible cause
Corrective action
Pressure is actually changing.
Normal
Sensor head is not the specified one.
Change with the specified one. Or calibrate the
current one.
Sensor head is contaminated.
Overhaul or replace the sensor head with a new
one.
There is a leak in the sensor head or in the
area where the sensor head is installed.
Leak in the sensor head
→
Replace the sensor
head.
Increase in wire rod resistance due to poor
contact of cable or corrosion of wire rod.
Other leak
→
Stop the leak.
Check cable for continuity.
Cable is subject to electromagnetic
induction (by external noise).
Change the cable installation location. Or use
the unit by turning off equipment that can be a
source of noise.
Examine the method of laying cable.
Take actions against noise separately.
• The output value largely differs from the expected value.
Possible cause
Corrective action
Sensitivity is very poor due to
contamination of the sensor head.
Change the sensor head with another one and
check symptom. If it is OK with the other sensor
head, the sensor head is faulty.
The pressure differs greatly from the
expected value.
Check pressure by another vacuum gauge.
* For troubles when the display unit is used, also refer to the instruction manual for the
display unit. Also check action using the sensor unit alone. If measurement can be
made by the sensor unit alone, the cause of trouble is in other than the sensor unit.
Summary of Contents for G-Tran Series
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