Emerson Understanding Calibration Techniques for the OCX 8800

Instruction Manual

IM-106-880, Rev 1.0 January 2007

OCX 8800

Section 6 Calibration

OVERVIEW

FULLY AUTOMATIC CALIBRATION

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6-1 Fully Automatic Calibration . . . . . . . . . . . . . . . . . . . . . . . . page 6-1 Operator - Initiated Autocalibration . . . . . . . . . . . . . . . . . page 6-4 Manual Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6-4

During a calibration, two calibration gases with known O2 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 O2 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 or by the LOI.

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 the LOI or HART/AMS to set up the OCX 8800 for fully automatic calibration.

Autocalibration Setup using the LOI

Use the following procedure to set up the 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.

3.From the Calib Setup second column submenu, use the right-pointing key to select the third column parameter list.

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