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Instruction Manual
IM-106-880C, OI
September 2009
Hazardous Area 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 5-4
D/A Trim Procedures - LOI . . . . . . . . . . . . . . . . . . . . . . . . . page 5-12
D/A Trim Procedures - HART . . . . . . . . . . . . . . . . . . . . . . . page 5-14
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
Hazardous Area OCX 8800. Slope and constant values are calculated to
determine if the Hazardous Area OCX 8800 is correctly measuring net
concentrations of O
2
and combustibles in the industrial process.
Before calibrating the Hazardous Area 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 Hazardous Area OCX
8800; automatic, operator-initiated automatic, and manual. Calibration
commands and menus can be accessed by 375 Field Communicator or by
the optional LOI.
FULLY AUTOMATIC
CALIBRATION
If the Hazardous Area 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 the LOI or 375 Field
Communicator to set up the OCX 8800 for fully automatic calibration.
Autocalibration Setup using the optional LOI
Use the following procedure to set up the Hazardous Area OCX 8800 for
automatic calibration. If necessary, use the LOI menu tree in Figure 4-4 for
reference. The unit must be equipped with calibration solenoids to use
automatic calibration.
NOTE
Automatic calibration is only available on units equipped with calibration
solenoids.
1. From the operating display use the right-pointing key to select SYSTEM
first column submenu.
2. From the SYSTEM first column submenu, use the right-pointing key to
select the Calib Setup second column submenu.