Emerson Rosemount OCX8800 Quick Start Manual page 36

Quick Start Guide
The COe zero feature is only valid if the transmitter is supplied with
calibration solenoids and the solenoids have been activated.
A Rosemount OCX8800 shipped from the factory must be configured before
the COe zero feature can be implemented. This same process must be
performed any time a replacement card stack is installed.
WARNING
During the COe Zero Function, the analog output signals may track the
oxygen and combustibles readings if configured to do so.
To avoid a potentially dangerous operating condition, remove the
transmitter from the automatic combustion control loop before performing
the COe Zero Function procedure.
Note
At the completion of the COe Zero Function, the COe analog output signal
will change if the Zero Update parameter is set to Yes.
3.6.1 Configure the calibration tolerance feature with the Field
Communicator - Fieldbus
Procedure
1. Use the Field Communicator or AMS software to access the Fieldbus
menu.
2. From the TRANSDUCER block menu, select COe ZERO.
3. From the COe ZERO menu, select the functions as follows:
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COe Zero Enable - Select "Yes" or "No" to enable or disable this
feature.
COe Zero Interval - Length of time between COe zero events.
Range is 60 to 480 minutes. Default is 60 minutes.
COe Zero Duration - Length of time COe zero gas flows. Range is
120 to 600 seconds. Default is 120 seconds.
COe Zero Purge Time - Length of time after COe zero is complete
before oxygen/ combustibles readings are considered valid.
Range is 60 to 180 seconds. Default is 60 seconds. Total duration
of this function is flow time plus purge time.
COe Zero Output Track - Determines if the analog output signals
track or hold during the function. Valid choices are None, Both,
COe, and O .
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February 2020
Rosemount OCX8800