Emerson Rosemount OCX8800 Quick Start Manual page 34

Quick Start Guide
2. From the TRANSDUCER block menu, select O
3. From the O
SETUP.
4. From the O
Select Present to enable the solenoids.
3.4.2 Configure the calibration solenoids with the LOI
Procedure
1. Use the Z pattern to enter the LOI menu tree.
2. From the SYSTEM menu, select Calib Setup.
3. From the Calib Setup menu, select Use Solenoids. Select Yes to enable
the solenoids.
3.5 Blowback feature
The blowback feature blows instrument air back through the center of the
internal filter and out the sample tube of the probe. This removes built up
dirt and particulate from the internal filter, sample line, and any optional in-
situ filter on the end of the sample tube.
The blowback feature is normally used in systems that have heavy
particulate in the process stream. The blowback feature requires the
optional blowback hardware to be properly installed external to the
transmitter. A Rosemount OCX8800 shipped from the factory must be
configured before blowback can be implemented. This same process must
be performed any time a replacement card stack is installed.
3.5.1 Use the Field Communicator or AMS software to access the Fieldbus
menu
Procedure
1. From the TRANSDUCER block menu, select Alarm Relay/Blowback.
2. From the Alarm Relay/Blowback menu, select Blowback.
3. From the Blowback menu, select Blowback Enabled. Also set the
following parameters:
•
•
•
34
CAL/COE CAL menu, select O
2
CAL SETUP/COE CAL SETUP menu, select Solenoids.
2
Blowback Interval - Length of time between blowback events (60
minutes recommended).
Blowback Period - Length of time blowback is activated (five
seconds recommended).
Blowback Purge Time - Length of time after blowback is
complete before oxygen/combustibles readings are considered
valid (set as required by the application).
February 2020
CAL/COE CAL.
2
CAL SETUP/COE CAL
2
Rosemount OCX8800