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Automated Pressure Calibrator
HART Tasks
61
URV: Configure the upper range value of transmitter
Closed Loop:
ON: Automatically sets the pressures to the LRV and URV values and
dwells for the time specified in the Dwell Time field. The
measurements are taken from the amount of time shown in the
Averaging Time field.
OFF: Trim the function manually.
Dwell Time:
This is a user-configurable amount of time for how long the pressure
dwells before measurements are taken. Dwell is greyed out if the Closed
Loop is set to NO.
Note
Once at the setpoint and the pressure stabilizes (Ready is shown),
the dwell countdown timer starts. Once the dwell is finished, if closed
loop was used, then the measurement is taken and the controller
continues to the next setpoint. If closed loop is OFF, push continue
to go to the next setpoint.
4. In the “Trim by Re-ranging” main menu, push to start trim.
5. If the “Closed Loop” was “ON”, the trim process automatically progresses
without user interaction. Otherwise, the “Closed Loop” is “OFF”.
6. Push to trim, and change to next range.
7. If necessary, repeat either “Lower Range” or “Upper Range” by pushing
or as necessary.
8. When the trim process is finished, follow the display guide “Trim Complete,
Press F1 to exit”.
Note
This trim process changes the upper and lower range values to
compensate the sensor’s error.
Write LRV/URV
Change the working range of a HART Transmitter by changing the LRV or URV
as follows:
1. Select Write LRV and URV.
2. In the change menu, input the new LRV and URV values.
Note
LRV cannot be set to lower than LTL (Lower transmitter limit) and
the URV cannot be set greater than the UTL (upper transmitter limit).
3. Push (Send) and save the new values.
4. Push to exit.
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