Emerson Rosemount OCX 8800 - Manual O and Coe Calibration Using the Field Communicator - Fieldbus

The Calibration Status is automatically changed to FlowCOeHi and then
ReadCOeHi for a period of time. During this period, if you try to go the next
calibration step by pressing OK and selecting START CAL/STEP CAL, you are
prompted with Operator step command is not accepted at this
time. The Next Cal Step command is not accepted at this time.
11. When ready, Calibration Status stops at STOP GAS. Switch off the COe high gas.
Press OK when ready. Select START CAL/STEP CAL to start purging gas.
The time to purge gas is specified by the Purge Time.
When the Purge step is complete, the Calibration Status is at IDLE if the calibration
is successful or CAL RECOMMENDED if the calibration has failed. A Calibration Failed
alarm is set off if the calibration has failed.
12. When calibration is complete, select Exit Cal to exit the calibration method.
5.4.4 Manual O
2
and COe calibration using the Field
Communicator - Fieldbus
To perform a manual O
2
/COe calibration, using the 375 Field Communicator, use the
following procedure.
If necessary, refer to Section for the Fieldbus menu tree.
Note
To select a menu item, either use Up and Down to scroll to the menu item and pressRight or use the
number keypad to select the menu item number. To return to a preceding menu, press the left arrow
key.
Procedure
1. To calibrate from Fieldbus, the first step is to set the Transducer Block to Out of
Service mode (OOS). To set the OOS mode, select Transducer, then select Process
followed by Out of Service in the Target Mode.
2. From the Transducer screen, select Methods.
3. Select OCX Calibration from the Methods menu.
4. From the OCX Calibration screen, select Calibrate O2 Sensor for O
2
calibration, Calibrate
Combustibles Sensor for COe calibration, or Calibrate Both Sensors if you want to
calibrate both sensors.
5. In the calibration screen, a Loop should be removed from automatic
control warning appears. Remove the device from any automatic control loops to
avoid a potentially dangerous operating condition and press OK.
6. The Select Action screen should look like the following. From the Select Action
screen, select Update Display to refresh the calibration status, Next Calibration Step to
continue calibration, Abort Calibration to abort calibration, or Exit to exit calibration.
Select one item from the list and press OK.
Calibration
Reference Manual 75