Emerson Rosemount 6888A, Reference Manual

Page: 90 / 136

3.10.1 Calibration procedure
This section covers manual calibration. For automatic calibration details, see the
instruction manual for the Rosemount SPS 4001B Single Probe Autocalibration Sequencer
or the Rosemount IMPS 4000 Intelligent Multiprobe Test Gas Sequencer.
1.
Use the 375/475 Field Communicator to access the main HART menu.
2. From the main menu, select CONFIGURE .
3. From the CONFIGURE menu, select CALIBRATION .
4. From the CALIBRATION menu, again select CALIBRATION .
5. From the CALIBRATION menu, select O
2
CALIBRATION.
WARNING!
Failure to remove the Rosemount 6888A from automatic control loops prior to
performing this procedure may result in a dangerous operating condition.
Calibration Method - Simplified Figure 3-6:
6. In the first screen, a
Loop should be removed from automatic control
warning occurs. Remove the Rosemount 6888A from any automatic loop controls to
avoid a potentially dangerous operating condition. Press OK when ready.
7. At the next screen, when the step shows
APPLY GAS 1
, press OK to continue.
8. When Flow Gas 1 and Read Gas 1 are complete and the step shows
APPLY GAS 2
,
press
OK
to continue.
9. When Flow Gas 2 and Read Gas 2 are complete and the step shows
STOP GAS
,
press OK to continue the calibration with purge.
10. When the screen shows
Loop may be returned to automatic control
,
press OK to return to the CALIBRATION screen.
11. At the CALIBRATION menu, select RESULT .
At the RESULT menu, the results of the calibration are displayed. In the event the
calibration cycle fails, the reason is displayed here as well. The calibration results are
described as follows:
Configuration, startup, and operation
82 Rosemount 6888A