3.6.3 Configure blowback with the LOI
Procedure
1. Use the Z pattern to enter the LOI menu tree.
2. From the SYSTEM menu, select Blow Back.
3. From the Blow Back menu, select Blow Bk Enable. Select Yes to enable
blowback. Also set the following parameters:
• Blow Bk Intrvl: Length of time between blowback events. Range is 0 to
32,000 minutes. Default is 60 minutes. Emerson recommeneds 60
minutes.
• Blow Bk Period: Length of time blowback in activated. Range is one to
five seconds. Default is two seconds. Emerson recommends five seconds.
• Blow Bk Purge: Length of time after blowback is complete before
oxygen/combustibles readings are considered valid. Range is 0 to 500
seconds. Default is 88 seconds. Set as required by the application.
• Force Blow Bk: Initiates a blow back event manually.
3.7 Calibration verify feature
The calibration verify feature flows one or more calibration gases to verify the
analyzer is reading correctly. The calibration verify feature flows each calibration
gas on demand to verify calibration, but does not change the slope or constant of
the current calibration. This function uses the same gas flow and purge times
from the basic calibration setup.
The calibration verify feature is only valid if the transmitter is supplied with
calibration solenoids and the solenoids have been activated.
WARNING
During the calibration verify function, the analog output signals track the
oxygen and combustibles readings.
To avoid a potentially dangerous operating condition, remove the transmitter
from the automatic combustion control loop before performing the calibration
verify procedure.
3.7.1 Verify calibration with the Field Communicator -
HART
®
Procedure
1. Use the Field Communicator or AMS software to access the HART menu.
2. From the DEVICE SETUP menu, select DIAG/SERVICE.
3. From the DIAG/SERVICE menu, select CALIBRATION.
Manual Configuration and start-up
00809-0500-4880 December 2022
Rosemount OCX8800A 61
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