Detailed Setup and Calibration
July 2009
4-15
If another adjustment is required, repeat step 2.
Otherwise, select Done and go to step 3.
3. From the adjustment menu, select the direction and
size of change required to set the travel to 50%.
If another adjustment is required, repeat step 3.
Otherwise, select Done and go to step 4.
4. Place the instrument In Service and verify that the
travel properly tracks the current source.
Analog Input Calibration
To calibrate the analog input sensor, connect a
variable current source to the instrument LOOP+ and
LOOP
−
terminals. The current source should be
capable of generating an output of 4 to 20 mA. Select
Analog In Calib from the Calibrate menu, then follow
the prompts on the Field Communicator display to
calibrate the analog input sensor.
1. Set the current source to the target value shown on
the display. The target value is the Input Range Low
value. Press OK.
2. The following message appears:
Use Increase and
Decrease selections
until the displayed
current matches the
target.
Press OK when you have read this message.
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 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. 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 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.
Pressure Sensor Calibration
Note
The pressure sensor is calibrated at
the factory and should not require
calibration.
Output Pressure Sensor Calibration
To calibrate the output pressure sensor, connect an
external reference gauge to the output being
calibrated. The gauge should be capable of measuring
maximum instrument supply pressure. From the
Calibrate menu, select Pressure Calib. Follow the
prompts on the Field Communicator display to
calibrate the instrument’s output pressure sensor.
1. Adjust the supply pressure regulator to the
maximum instrument supply pressure. Press OK.
4
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Страница 71: ...Parts July 2009 7 1 7 7 Section 7 Parts Parts Ordering 7 2 Parts Kits 7 2 Parts List 7 2 7 ...
Страница 77: ...Principle of Operation July 2009 A 1 A A Appendix A Principle of Operation DVC2000 Operation A 2 A ...
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