Appendix 1: BetaGauge
P
PIIR
R
Calibration Procedure
Overview
Calibration adjustment of the BetaGauge PIR is performed
electronically via internal software with the case closed. There are
no mechanical adjustments; all calibration commands and
adjustments are done via the keypad, using the display to guide
the user through the calibration process.
Eight calibration points are used in the adjustment program,
working from full scale to zero at pressures equaling 100%, 87.5%,
75%, 62.5%, 50%, 37.5%, 25%, 12.5%, and 0% of full scale plus
vacuum.
Note
: This is an ambient temperature calibration, and should be
performed at an ambient temperature of 23° C ± 3° C (72° F ± 5°
F). Calibration outside this temperature range will invalidate the
temperature compensation program in the BetaGauge PIR.
Calibration Interval
You should check performance of the BetaGauge PIR at the
interval required by your calibration program. We recommend
adjustment when measurement deviates by more than 75% of the
specified accuracy, or 0.04%
Test Equipment
Verification and calibration of the BetaGauge PIR requires
pressure and/or vacuum standards able to produce and indicate
pressures from vacuum to the full-scale range of the unit under
test. In order to maintain the specified accuracy of the BetaGauge
PIR, standards should have a TUR of 4:1 or better.
Connections:
The BetaGauge PIR uses a 1/4 NPT male connection in the
pressure input port. Various adapters may or may not be needed
to connect to the pressure standard. Always make sure the hose,
tubing, and fittings etc have a rated working pressure at or above
the pressure of the unit. Also it is important that there be no leaks
when performing calibration; use Teflon tape where appropriate.
Entering Calibration Mode:
After you have made your connections, turn the power on while
holding the CONFIG key. Use the arrow keys to enter the
password. The password is 101. If you have entered calibration
mode correctly the display should look as shown below. The
pressure value displayed will be the full-scale value of the gauge.
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