DigiVac SNAP Betriebshandbuch - Seite 14

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Section 6. Servicing and Maintenance

Sensor and Plumbing

In many cases, a sensor may become fouled with oil or other foreign matter. It is often

possible to restore the functionality of contaminated probes with cleaning. If the contaminant

is known, the SNAP plumbing should be ﬁlled with a ﬂuid that is known to be a solvent to that

contaminant. Ethanol/alcohol are very powerful

solvents and are highly effective against some

contaminants.

After cleaning with solvents, the plumbing should be

completely dried or ﬂushed with a volatile solvent to

assure that it is dry prior to reinstalling it. If this is

not done, contamination of the system may result.

Maintenance

Your vacuum instrument should give you many years

of trouble-free service. There are no regularly

scheduled maintenance intervals. If consistent

accuracy is required, it is recommended that the

SNAP and power supply be returned for an annual

calibration check.

Notes on calibration

There is inherent drift in all sensors. Repeatability is speciﬁed in the datasheet, but the

speciﬁcation is typically a worst case scenario as drift is not easily predicted and depends on

the operating environment. Depending on your accuracy requirements, it makes sense to set up

a calibration interval to obtain as found data, and get a fresh calibration. Having this information

will allow you to determine the optimal calibration interval. The accepted interval is 1 year, but

depends on the accuracy you require and what you have deﬁned in your standard operating

procedures (SOPs).

Note the sensors have excellent accuracy by themselves. Additional accuracy is gained by

calibrating the sensor controller (sensor is integral on SNAP) to the sensor. The sensor itself

cannot be calibrated, but the sensor-controller pair is. See our blog on sensor interchangeability

effects on accuracy for the Bullseye Precision Gauge Piezo for more information.

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