Martel Electronics BetaGauge 321A - Manual (Page 27)

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Setup 4: The lower display is set to [P1] switch test, the other displays are off.
Setup 5: The upper display is set to [P1], the middle display is set to [P2] and the lower
display is set to RTD.
11. Custody Transfer / Flow Calibration
The Model 311A/321A is ideal for flow computer calibration. Every manufacturer of flow
computers has a different calibration procedure, but most call for calibration of three
parameters: static pressure, differential pressure and temperature. To facilitate these
measurements recall setup #5 on the 311A/321A.
Note: The pressures in the UPPER, and MIDDLE displays can be changed to [P1],
[P2], and EXT.
1. Connect the calibrator to your static and differential pressures. ([P1], [P2], EXT) Then
connect the RTD sensor to the calibrator.
2. Using the reading of your RTD, static, and differential pressures make sure the flow
computer has the correct reading. If not, adjust the flow computer as necessary.