Copyright 2010 Baker Hughes Company.
English–PACE Calibration Manual | 11
6. Calibration Check A - Control Modules
Note: The PACE adds the barometric reading to a gauge range to produce a pseudo-absolute
range (for CM2 and below). For CM3 the PACE subtracts the barometric reading from an
absolute range to produce a pseudo-gauge range.
Note:
Use the Calibration check mode, as this removes any additional pressure processing
enabled by the user.
For PACE calibration menus, refer to Appendix A.
To check the calibration of PACE, proceed as follows:
1. Connect the PACE to the pressure calibration standard. See Section 5.
2. With the pressure calibration standard connected to the correct pressure port, on the PACE
screen, select the measured pressure then Range to select the pressure range to be
checked.
3. For gauge ranges (CM0, 1, 2), apply zero pressure to the UUT.
a. Select the measured pressure then Zero to zero the selected gauge range.
b. On completion of the zero operation, the display shows ‘Zero completed successfully’.
4. Select the measured pressure then Global Setup > Calibration and enter the Calibration
PIN (4321).
5. Select Sensor Correction.
6. Select the pressure range to be checked or corrected.
7. Select the pressure sensor to be checked or corrected.
8. Select Calibration Check.
9. Adjust the applied calibration pressure to the first pressure value and wait until this pressure,
displayed on PACE is stable to less than 5 ppm (0.0005%) for CM2 and below (aim for 1 ppm
(0.0001%) on CM3). The standard deviation of the measured pressure is shown on the
screen in the pressure units to help with measuring the deviation in pressure.
10. Compare the pressure value on the pressure calibration standard to the value shown on the
PACE and record the difference.
11. Do steps (9) and (10) again for each calibration pressure.
12. If the recorded difference is more than the permitted deviation (Precision) for the selected
range, it is necessary to do a calibration adjustment for that range on the calibrator. Refer to
PACE Datasheet for permitted precision deviation and accuracy.
Note: If it has been less than 24 hours since calibration, the PACE specification equals the
Datasheet precision specification with respect to the original pressure calibration standard. If it
has been greater than 24 hours since calibration, the PACE specification is the Route-Sum-
Squared (RSS) of the Datasheet precision and the long term stability specification with respect
to the original pressure calibration standard.
13. If no adjustment has been done and the calibration check is within the precision limits, then
the calibration date can be updated by selecting the As Found Calibration Icon.
INFORMATION This check is for Control Modules CM0, 1 and 2 (and CM3 up
to and including 3.5 bar Absolute).
Zero the gauge ranges (CM0, CM1, CM2) immediately before a calibration check.
For CM3 8 bar absolute ranges and above, zero the Reference Sensor. See the
user manual.
Zeroing is not necessary for CM3 2 bar and 3.5 bar ranges.
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