Instruction Manual
D103785X012
Calibration
June 2017
52
3. The value of the Analog Input appears on the display. Press OK to display the adjustment menu.
4. From the adjustment menu, select the direction and size of adjustment to the displayed value.
Selecting large, medium, and small adjustments causes changes of approximately 0.4 mA, 0.04 mA, and 0.004 mA,
respectively.
If the displayed value does not match the current source, press OK, then repeat this step (step 4) to further adjust
the displayed value. When the displayed value matches the current source, select Done and go to step 5.
5. Set the current source to the target value shown on the display. The target value is the Input Range High value.
Press OK.
6. The following message appears:
Use the Increase and Decrease
selections until the displayed
current matches the target.
Press OK when you have read this message.
7. The value of the Analog Input appears on the display. Press OK to display the adjustment menu.
8. From the adjustment menu, select the direction and size of adjustment to the displayed value. If the displayed value
does not match the current source, press OK, then repeat this step (step 8) to further adjust the displayed value.
When the displayed value matches the current source, select Done and go to step 9.
9. Place the instrument In Service and verify that the analog input displayed matches the current source.
Relay Adjustment
Before beginning travel calibration, check the relay adjustment. Replace the instrument cover when finished.
Note
Relay B and C are not user‐adjustable.
Double‐Acting Relay
The double‐acting relay is designated by “Relay A” on a label affixed to the relay itself. For double‐acting actuators, the
valve must be near mid‐travel to properly adjust the relay. The Field Communicator will automatically position the
valve when
Relay Adjust
is selected.
CAUTION
Care should be taken during relay adjustment as the adjustment disc may disengage if rotated too far.
Rotate the adjustment disc, shown in figure 4‐6, until the output pressure displayed on the Field Communicator is
between 50 and 70% of supply pressure. This adjustment is very sensitive. Be sure to allow the pressure reading to
stabilize before making another adjustment (stabilization may take up to 30 seconds or more for large actuators).