Calibration
December 2009
5-3
Auto Calibration
(TB > Configure/Setup > Calibration > Auto
Calibration)
WARNING
During calibration the valve will move
full stroke. To avoid personal injury
and property damage caused by the
release of pressure or process fluid,
provide some temporary means of
control for the process.
There are two auto travel calibration options available;
autocalibrate-standard or autocalibrate− extended.
Autocalibrate-extended is used for large actuators or
actuators with accessories.
Auto Calibration requires user interaction only when
the Feedback Connection is SStem Pot. If the
Feedback Connection is SStem Roller Pot, no user
interaction is required. For valves with the SStem Pot
Feedback Connection, interaction provides a more
accurate crossover adjustment.
1. Select the method of crossover adjustment:
manual, last value, or default. Manual adjustment is
recommended.
If you select Last Value, the crossover setting
currently stored in the instrument is used and there
are no further user interactions with the
auto-calibration routine (go to step 3). If you select
Default, an approximate value for the crossover is sent
to the instrument and there are no further user
interactions with the auto-calibration routine (go to
step 3). If you select Manual, the Field Communicator
prompts you to adjust the arm until the feedback arm
is 90° to the actuator stem, as shown in figure 5-1.
After you have made the adjustment (step 2), press
OK and go to step 3.
2. The Field Communicator displays a menu to allow
you to adjust the crossover.
Select the direction and size of change required to set
the feedback arm so it is 90° to the actuator stem, as
shown in figure 5-1.
If another adjustment is required, repeat step 2.
Otherwise, select Done, and then Next and go to
step 3.
3. The remainder of the auto-calibration procedure is
automatic.
ACTUATOR
STEM
FEEDBACK ARM
Figure 5-1. Crossover Point
90
A6536−3 / IL
Note
If the instrument is in the travel control
state (Travel, Travel with Pressure
Fallback Auto Recovery, or Travel with
Pressure Fallback Manual Recovery)
you will be prompted to calibrate the
pressure range. If you select “yes” the
valve is moved from 1% to 99%, and
Pressure Range Lo
(PRESS_RANGE_LO [42.8]) and
Pressure Range Hi (PRESS_RANGE_HI
[42.7]) are set.
4. When the calibration procedure has finished, you
will be prompted to enter the name of the person
performing the calibration procedure.
5. Enter the location of the calibration procedure, if
desired.
6. Enter the date of the calibration procedure, if
desired.
5
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