Martel Electronics BetaGauge PI PRO - Manual (Page 11)

Mechanical
Dimensions 4.5” (diameter) x 2.2” (depth) x 5” (height)
(11.4cm x 5.6cm x 12.7cm) (PI PRO depth is 1.5” or 3.7cm)
Pressure Connection: ¼” NPT Male
Housing: Stainless steel, meets NEMA 4/IP65 (PI PRO: cast Z
N
AL)
Display
5-1/2 Digits, 0.65” (16.53 mm) high
20-Segment bar graph, 0 to 100%
Power
Battery three (3), size AA alkaline batteries
Battery Life 1,500 hours without backlight (continuous on)
2,000 hours at slow sample rate
Low Battery Indicator icon is displayed near the end of battery life
Appendix 1: BetaGauge PI Calibration Procedure
Overview
Calibration adjustment of the BetaGauge PI 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. Note that absolute range gauges require a factory calibration
and must be returned to the factory or an authorized service center.
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 PI.
Calibration Interval
You should check performance of the BetaGauge PI 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 PI requires pressure
and/or vacuum standards able to produce and indicate pressures from
9