DigiVac Bullseye Piezo Manual del usuario - Página 12

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Maintenance

The Bullseye Precision Gauge Piezo is designed for trouble free use with little or no maintenance

required. A few best practices should be followed. While not required for accuracy, it is best to

mount sensor in stem down orientation where the threads are down towards the ground, and the

wire is up. This will facilitate draining of any foreign matter from the sensor to help mitigate physical

obstruction of the diaphragm.

Keep the measurement unit clean and dry to prevent foreign matter or water from entering the

display and controller electronics. The unit is not waterproof, so splashes of water while the gauge is

powered on can damage the electronics. If a weatherproof version is required, consult DigiVac.

NOTES ON CALIBRATION

There is inherent drift in all sensors including the DigiVac piezo sensors. Drift is specified in the

datasheet, but the specification is typically a worst-case scenario as drift is not easily predicted and

depends on operating environment. DigiVac offers calibration services, including NIST calibration

which provides vacuum data on the gauge. This could be useful to help you determine when the gauge

has drifting out of your determined specifications and will help you determine your optimal calibration

schedule. All DigiVac gauges are sold calibrated against a NIST standard, but only those purchased with

a NIST calibration come with the data. You can pull this information yourself, when you are first using

the gauge to determine its measurement parameters. Having this information will allow you to

determine the optimal calibration interval. The generally accepted calibration interval is 1 year but

depends on what accuracy you require and your standard operating procedures.

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

the sensor controller (the thing with the display and cable coming out of it) to the sensor. The sensor

itself cannot be calibrated, but the sensor-controller pair is. Note: that the 775i sensors accuracy

applies to any type of measurable gases. Readings will be the same regardless of the type of gas you

are trying to measure.

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