Ocx 8800 – Emerson ROSEMOUNT OCX 8800 User Manual
Page 57
Instruction Manual
IM-106-880, Rev 1.0
January 2007
5-3
OCX 8800
OPERATOR - INITIATED
AUTOCALIBRATION
An operator can initiate an automatic calibration at any time provided that the
unit is equipped with calibration solenoids.
Autocalibration using HART
To initiate an automatic calibration using HART/AMS, perform the following
steps on the HART menu tree. Refer to Section 4, Using HART
Communications, for the HART menu tree.
1. Select DIAG/SERVICE from DEVICE SETUP menu.
2. Select CALIBRATE from the DIAG/SERVICE menu.
3. Select PERFORM CAL from the CALIBRATE menu.
4. Select CAL METHODS from the PERFORM CAL menu.
5. From the CAL METHODS menu, select the type of calibration desired:
O2 Calibration, COe Calibration, or O2 and COe Calibration.
MANUAL CALIBRATION
If a unit is not equipped with calibration solenoids, a calibration must be
performed by an operator following prompts from the unit. Refer to the
following paragraphs for manual calibration.
Manual O
2
Calibration using HART
To perform a manual O
2
calibration using the HART communicator or AMS,
use the following procedure. If necessary, refer to Section 4, 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 O
2
calibration.
3. In the first O
2
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