Instruction Manual
D103557X012
Calibration
April 2016
40
Supply Pressure Sensor
To calibrate the supply pressure sensor, connect an external reference gauge to the output side of the supply
regulator. The gauge should be capable of measuring maximum instrument supply pressure. Follow the prompts on
the Field Communicator display to calibrate the instrument's supply pressure sensor.
1. Select a) Zero Only, or b) Zero and Span (gauge required).
a. If Zero Only calibration is selected, adjust the supply pressure regulator to remove supply pressure from the
instrument. Press OK. Once calibration is complete, go to step 5.
b. If Zero and Span calibration is selected, adjust the supply pressure regulator to remove supply pressure from the
instrument. Press OK. Adjust the supply regulator to the maximum instrument supply pressure. Press OK.
Proceed with step 2.
2. The following message appears:
Use the Increase and Decrease
selections until the displayed
pressure matches the supply
pressure.
Press OK when you have read this message.
3. The value of the pressure appears on the display.
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 3.0 psi/0.207 bar/20.7 kPa, 0.30
psi/0.0207 bar/2.07 kPa, and 0.03 psi/0.00207 bar/0.207 kPa, respectively.
Adjust the displayed value until it matches the supply pressure, select Done and go to step 5.
5. Place the instrument In Service and verify that the displayed pressure matches the measured supply pressure.
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. 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 the 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.
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