Emerson ROSEMOUNT OCX 8800 - Manual (Page 55)

Instruction Manual
IM-106-880, Rev 1.0
January 2007
OCX 8800
http://www..raihome.com
Section 5 Calibration
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5-1
Fully Automatic Calibration . . . . . . . . . . . . . . . . . . . . . . . . page 5-1
Operator - Initiated Autocalibration . . . . . . . . . . . . . . . . . page 5-3
Manual Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5-3
OVERVIEW During a calibration, two calibration gases with known O
2
concentrations and
one calibration gas with a known COe concentration are applied to the OCX
8800. Slope and constant values are calculated to determine if the OCX 8800
is correctly measuring net concentrations of O
2
and combustibles in the
industrial process.
Before calibrating the OCX 8800, verify that the calibration gas parameters
are correct by setting the test gas values used when calibrating the unit. Refer
to Section 3, Configuration and Startup.
There are three calibration methods available to the OCX 8800; automatic,
operator-initiated automatic, and manual. Calibration commands and menus
can be accessed by HART/AMS.
FULLY AUTOMATIC
CALIBRATION If the OCX 8800 is equipped with calibration solenoids, the unit can be
programmed to automatically calibrate without any operator action. Refer to
the following paragraphs for using HART/AMS to set up the OCX 8800 for
fully automatic calibration.
Autocalibration Setup using HART
NOTE
Automatic calibration is only available on units equipped with calibration
solenoids.
Use the following procedure to specify a time interval (in hours) at which the
OCX 8800 will automatically calibrate.
1. From the DEVICE SETUP screen, select DETAILED SETUP.
2. From the DETAILED SETUP screen, select O2 CALIB PARAMS or
COE CALIB PARAMS.
3. If the unit is equipped with calibration solenoids and timed automatic
calibrations are desired, select Solenoids, then select Yes. Selct No to
disable the calibration solenoids.