Emerson OCX 8800 instruction manual Manual O2 Calibration using Hart

Instruction Manual

IM-106-880, Rev 1.0 January 2007

OCX 8800

7.Press the right-pointing key when the low O2 reading is stable. Turn off the low O2 test gas and turn on the high O2 test gas as prompted by the Flow High Gas message.

8.Press the right-pointing key when the high O2 test gas is applied. The calibration data changes as the calibration proceeds.

9.Press the right-pointing key when the high O2 reading is stable. Turn off the high O2 test gas. Press the right-pointing key to start the high O2 gas purge.

10.When the purge period expires, the LOI display reverts to the normal operation display. If the calibration failed, the display will indicate an alarm condition.

11.Press the right-pointing key to start combustibles calibration. Turn on the CO test gas when prompted.

12.Press the right-pointing key when the CO test gas is applied. The calibration data changes as the calibration proceeds.

13.Press the right-pointing key when the CO reading is stable.

14.Turn off the CO test gas and press the right-pointing key to start the CO gas purge.

15.When the purge period expires, the LOI display reverts to the normal operation display. If the calibration failed, the display will indicate an alarm condition.

Manual O2 Calibration using HART

To perform a manual O2 calibration using the HART communicator or AMS, use the following procedure. If necessary, refer to Section 5, Using HART Communications, for the HART menu tree.

NOTE

To select a menu item, either use the up and down arrow keys to scroll to the menu item and press the right arrow key or use the number keypad to select the menu item number.

To return to a preceding menu, press the left arrow key.

1.From the DIAG/SERVICE menu, select CALIBRATION. From the CALIBRATION menu, select PERFORM CAL.

2.From the PERFORM CAL menu, select CAL METHODS. Select O2 CALIBRATION to start O2 calibration.

3.In the first O2 Calibration screen, a Loop should be removed from automatic control warning appears. Remove the OCX 8800 from any automatic control loops to avoid a potentially dangerous operating condition and press OK.

4.The main Calibration screen should look like the following. Press OK to continue.

OCX: TAG NAME

STATUS: Idle

TIME REMAIN: 0s

O2: 0.4 %, 85.95mV OK/NEXT to Select ABORT/CANCEL to Exit

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