Emerson Rosemount OCX8800A - Page 96

6.4.1 Calibrate manually using the optional local
operator interface (LOI)
If necessary, refer to Figure 4-4. Once the the operator initiates the manual
calibration procedure at the LOI, a series of prompts will appear giving
instructions to the operator.
Procedure
1. Press Right to select the CALIBRATION first column submenu.
2. From the CALIBRATION submenu, press Right to select the Cal Control
second column submenu.
3. From the Cal Control submenu, press Right to select the third column Start
Cal O2 option.
4. Remain at Start Cal O2 or press Down to select Start Cal COe or Start Cal
Both.
The following sequence applies when you select Start Cal Both.
5. Press Right to start the calibration. Turn on the low O
2
test gas, when
prompted by the Flow Low Gas message.
6. Press Right after applying the low O
2
test gas.
The calibration data changes as the calibration proceeds.
7. Press Right when the low 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 Right after applying the high O
2
test gas.
The calibration data changes as the calibration proceeds.
9. Press Right when the high O
2
reading is stable. Turn off the high O
2
test
gas. Press Right 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 will indicate an alarm
condition.
10. Press Right to start combustibles calibration. Turn on the CO test gas when
prompted.
11. Press Right after applying the CO test gas.
The calibration data changes as the calibration proceeds.
12. Press Right when the CO reading is stable.
13. Turn off the CO test gas and press Right 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 will indicate an alarm
condition.
Calibration Manual
December 2022 00809-0500-4880
96 Emerson.com/Rosemount