Digital Calibration Adjust; Sensor Calibration; Pressure Sensor Calibration - Fisher FIELDVUE DVC6200 Instruction Manual

DVC6200 Digital Valve Controller

Digital Calibration Adjust

From the Calibrate menu, select Travel Calibration,
Manual Calibration and Digital Adjust.
Connect a variable current source to the instrument
LOOP + and LOOP − terminals. The current source
should be set between 4 and 20 mA.
Follow the prompts on the Field Communicator display
to calibrate the instrument's travel in percent.
1. Adjust the input current until the valve is near
mid-travel. Press OK.
Note
5
0% Travel = Valve Closed
100% Travel = Valve Open
2. From the adjustment menu, select the direction and
size of change required to set the travel at 0%.
Selecting large, medium, and small adjustments
causes changes of approximately 10.0%, 1.0%, and
0.1%, respectively.
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 100%.
If another adjustment is required, repeat step 3.
Otherwise, select Done and go to step 4.
4. From the adjustment menu, select the direction and
size of change required to set the travel at 0%.
If another adjustment is required, repeat step 4.
Otherwise, select Done and go to step 5.
5. From the adjustment menu, select the direction and
size of change required to set the travel to 100%.
If another adjustment is required, repeat step 5.
Otherwise, select Done and go to step 6.
6. From the adjustment menu, select the direction and
size of change required to set the travel to 5%.
If another adjustment is required, repeat step 6.
Otherwise, select Done and go to step 7.
7. From the adjustment menu, select the direction and
size of change required to set the travel to 95%.
If another adjustment is required, repeat step 7.
Otherwise, select Done and go to step 8.
8. Place the instrument In Service and verify that the
travel properly tracks the current source.
56
Calibration using the Aux Terminal Connections
Note
Pressure range is not captured during
this procedure.
Travel calibration can also be accomplished by
shorting the Aux Terminal Connections for 3 to 5
seconds. You can abort the procedure by shorting the
auxiliary terminals for 1 second.
To enable this calibration the Aux Terminal Mode must
be set to Auto Calibration. The instrument Operational
Status during calibration is Calibration in Progress.
Use this calibration procedure to calibrate the digital
valve controller travel whenever the I/P converter or
relay is replaced. Do not use this calibration for initial
calibration when mounting the instrument on an
actuator, or if the printed wiring board assembly was
replaced.
You can use the aux terminal connections to calibrate
the digital valve controller if you suspect calibration
has changed due to drift. However, prior to initiating
calibration for this reason, perform a Valve Signature
diagnostic test, using ValveLink software. This will
capture the as-found data for future root cause
analysis.

Sensor Calibration

Note
The pressure sensor is calibrated at
the factory and should not require
calibration.
Pressure Sensors
Output Pressure Sensor
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 Sensor Calibration, Press
Sensors. Depending upon the sensor you wish to
calibrate, select either Output A Sensor or Output B
Sensor. Follow the prompts on the Field
Communicator display to calibrate the instrument's
output pressure sensor.
September 2010