Copyright 2010 Baker Hughes Company.
10 | PACE Calibration Manual–English
3. With the pressure calibration standard connected to the correct pressure port, select
Measured Pressure
and press
Range
to select the pressure range to be checked.
4. Barometric pressure can be displayed in the status area for -B variants.
5. Set maximum displayed resolution.
6. Press
Measured Pressure/Zero
to zero the selected gauge range.
7. On completion of the zero operation, the display shows Zero completed successfully.
8. Adjust calibration pressure to the first pressure value and wait until this pressure, as
displayed on PACE, is stable to less than 5
ppm (0.0005%) for CM2 and below (aim for
1
ppm (0.0001%) on CM3). Display filtering may be required.
9. Compare the pressure value on the pressure calibration standard to the value displayed on
the PACE and record the difference.
10. Repeat (8) and (9) for each pressure, as prompted by the PACE.
11. If the recorded difference exceeds the permissible deviation (accuracy) for the selected
range, the calibrator requires a calibration adjustment for that range. Refer to PACE Data
Sheet for permissible precision deviation and accuracy.
Note:
If it has been less than 24
hours since calibration, the PACE specification equals the
Data Sheet 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 sum of
the Data Sheet precision and the long term stability specification with respect to the original
pressure calibration standard. It is recommended that an adjustment is performed on a new
instrument and/or if the deviation measured is greater than 70% of the 1-Year uncertainty
specification.
12. Select the next pressure range for a calibration check.
13. After completing all calibration checks, adjust the pressure calibration standard to
atmospheric pressure.
14. Disconnect pressure calibration standard from the output.
15. If no further calibration is required, switch off the PACE.
7. Calibration Adjustment
For PACE calibration menus, refer to Appendix
To adjust the calibration of PACE, proceed as follows:
1. Connect the PACE to the pressure calibration standard. Refer to Section
Note:
Calibration adjustments may be carried out in any order. Three calibration points are
required for gauge sensors. Two calibration points are required for absolute sensors.
2. Select
Measured Pressure/Global Set-up/Calibration
and enter the Calibration
PIN
(4321)
.
3. Select
Sensor Correction
.
4. Select the pressure range to be corrected.
5. Select the pressure sensor to be corrected.
6. Select
Calibration Adjustment
.
7. The display shows the first value to be set on the pressure calibration standard and to press
OK
when the applied pressure is stable to less than 5
ppm (0.0005%) for CM2 and below
(aim for 1 ppm (0.0001%) on CM3). Use the numeric keys to enter the precise applied
pressure.
Note:
The display also shows throughout this procedure the message Calibrating and the
selected pressure range.
