Emerson Rosemount OCX 8800 - Manual Calibration Using the Optional LOI

5.4.1 Manual calibration using the optional LOI
Use the following procedure to perform a manual calibration with the LOI.
If necessary, refer to the menu tree in Chapter 4. Once the manual calibration is intiated at
the LOI, a series of prompts appear giving instructions to the operator.
Procedure
1. Use the Right key to select the CALIBRATION first column submenu.
2. From the CALIBRATION submenu, use the Right key to select the Cal Control second
column submenu.
3. From the Cal Control submenu, use the Right key to select the third column Start Cal
O2 option.
4. Remain at the Start Cal O2 option or use the Down key to select Start Cal COe or Start
Cal Both.
The following sequence applies when Start Cal Both is selected.
5. Use the Right key to start the calibration. Turn on the low O
2
test gas when
prompted by the Flow Low Gas message.
6. Press the Right key when the low O
2
test gas is applied.
The calibration data changes as the calibration proceeds.
7. Press the Right key when the O
2
reading is stable. Turn off the low O
2
test gas and
turn on the high O
2
test gas as prompted by the Flow High Gas message.
8. Press the Right key when the high O
2
test gas is applied.
The calibration data changes as the calibration proceeds.
9. Press the Right key when the high O
2
reading is stable. Turn off the high O
2
test gas.
Press the Right key to start the high O
2
gas purge.
When the purge period expires, the LOI display reverts to the normal operation
display. If the calibration failed, the display indicates an alarm condition.
10. Press the Right key to start combustibles calibration. Turn on the CO test gas when
prompted.
11. Press the Right key when the CO test gas is applied.
The calibration data changes as the calibration proceeds.
12. Press the Right key when the CO reading is stable.
13. Turn off the CO test gas and press the Right key to start the CO gas purge.
When the purge period expires, the LOI display reverts to the normal operation
display. If the calibration failed, the display indicates an alarm condition.
Calibration
Reference Manual 71