Emerson OCX 8800 Instruction Manual download pdf (Page 53)

Instruction Manual

IM-106-880 Original Issue

February 2005

OCX 8800

http://www.processanalytic.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

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

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.

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Emerson OCX 8800 Instruction Manual Page 53