Emerson Rosemount OCX8800 Instruction Manual page 99

Section 5:
Calibration
April 2017
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The Calibration Screen should look like the following, press OK to continue. The
Calibration Screen should be automatically refreshed, however it may take a while for
the data to refresh.
• Calibration Step = Apply O2 Low Gas
• Step Time Remaining = 0 seconds
• O2 Value = 0.40 %
• Combustibles Value = 1000 ppm
• Press Next for Selection
When the calibration status is at the Apply O2 Low Gas/ Apply Comb Low Gas step,
switch on O2 Low Gas/COe Low Gas. Verify the O2 concentration measured matches
the O2 Low Gas parameter in the setup. The unit samples reference air as the COe Low
Gas. Press OK when ready.
Select Next Calibration Step and press OK to start applying the test gas. The time to
apply the test gas is specified by the Gas Time.
The calibration step will change to Flow O2 Low Gas/ Flow Comb Low Gas and then Read
O2 Low Gas/ Read Comb Low Gas for a period of time.
When ready, Calibration Step will stop at the Apply O2 High Gas/ Apply Comb High Gas.
Switch off the O2 Low Gas/Sample Reference Air and switch on the O2 High Gas/Comb
Test Gas. Verify the O2/COe concentration measured matches the O2 High Gas/COe
Test Gas parameter in the setup. Press OK when ready.
Select Next Calibration Step to start applying the test gas. The time to apply the test
gas is specified by the Gas Time.
The calibration step will change to Flow O2 High Gas/ Flow Comb High Gas and then
Read O2 High Gas/ Read Comb High Gas for a period of time.
Skip over to Step 19, Stop Gas, if executing Calibrate O2 Sensor or Calibrate
Combustibles Sensor.
The calibration step will change to Read Comb Low Gas for a period of time. When
ready, Calibration Step will stop at Apply Comb High Gas. Switch off the O2 High Gas
and switch on the COe Test Gas. Verify the COe concentration measured matches the
COe Test Gas parameter in the setup.
Select Next Calibration Step to start applying the test gas. The time to apply the test
gas is specified by the Gas Time.
The calibration step will change to Flow Comb High Gas and then Read Comb High Gas
for a period of time.
When ready, Calibration step will stop at Stop Gas. Switch off the O2 High Gas/COe Test
Gas, Press OK when ready. Select Next Calibration Step to start purging gas. The time to
purge gas is specified by the Purge Time.
When the Purge step is complete, the Calibration Step will be at Idle. The Calibration
Failed alarm will be set if the calibration has failed.
When calibration is complete. Select Exit to exit the calibration method.
Manual O2/COe Calibration using the Field Communicator -
Fieldbus
Instruction Manual
IM-106-880C, OI