Martel Electronics BetaGauge 321A-Ex - Manual (Page 16)

14
3. Measuring Pressure
To measure pressure, connect the calibrator using an appropriate fitting. Choose a
pressure setting for the display being used. The calibrator is equipped with two internal
sensors. Be sure to choose the sensor based on working pressures and accuracy.
Warning
Pressure sensors may be damaged and/or personnel injury may occur due to improper
application of pressure. Please refer to the table of ranges and resolutions at the back of
this manual for information on overpressure and burst pressure ratings. Vacuum should
not be applied to any gauge pressure sensor. The calibrator display will indicate “OL”
when an inappropriate pressure is applied. If “OL” is observed on any pressure display,
the pressure should be reduced or vented immediately to prevent damage or possible
personnel injury. “OL” is displayed when the pressure exceeds 120% of the nominal range
of the sensor or when a vacuum in excess of 2 PSI is applied on gauge range sensors.
Figure 5
Use the (ZERO) key to zero the pressure sensor when vented to atmospheric pressure.
Important NOTE: To protect sensor integrity and prevent damage to the sensor, the
calibrator will display OL [overload] when the applied pressure exceeds 120% of the full
scale calibrated range of the sensor.
Important NOTE: To ensure accuracy of the calibrator it is critical to zero the calibrator
before a device is calibrated.