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Instruction Manual
7 Service
7.1 Calibration
The gauge is factory-calibrated and the pressure reading applies to dry air, O
-1
7.6 X 10
Torr, the readings have to be corrected as described in
7.2 Maintenance
In general, under clean operating conditions, maintenance is not required for the PCM301. The operational
characteristic curve of the gauge may change due to contamination and extended period of use. Periodically
check the zero and adjust it if necessary (See section
In case of a defect the sensor can be replaced in the field.
InstruTech assumes no liability and the warranty becomes null and void if any repair work other than replacing
the sensor is carried out by the end-user or third parties.
7.3 Contamination
The most common cause of all vacuum gauge failures is contamination of the sensor. Noisy or erratic readings,
gauge failures due to contamination or wear and tear, as well as expendable parts (e.g. replacement sensor) are
not covered by the warranty.
Contamination can to a certain extent be reduced by:
• Geometric protection (e.g. screenings, elbows) against particles that spread rectilinearly
• Mounting the flange of the gauge at a place where the partial pressure of the pollutants is particularly low.
7.4 Removing the gauge from service
WARNING! Contaminated parts can be detrimental to health. Before beginning work, find out whether
parts are contaminated and adhere to the relevant regulations and precautions for handling contaminated
parts.
CAUTION! Dirt and damage impair the function of the vacuum component. Take appropriate measures to
ensure cleanliness and prevent damage. Touching the product or parts with bare hands increases the
desorption rate. Always use clean, lint free gloves as well as clean tools when working with this product.
1) Vent the vacuum system and turn off power to the gauge.
2) Unplug the cable and remove the gauge from the chamber.
3) Re-install the protective lid.
InstruTech
section 5
.
4.4.4
for Zero Adjustment instructions).
PCM301 Busy Bee
, CO and N
. For other gases below
2
2
Page 26
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