Emerson Process Management 3422 User Manual
Reference, Installation, and Operations Manual
Section 6: Meter operation
3-9000-743 Rev S
June 2013
Flow-condition pressure and temperature
209
On the Daniel MeterLink
Analog Inputs Wizard Start
screen, select the analog input to calibrate
and click on the
Next
button. The
Current Calibration
screen shows the current offset and gain
and the input scaling (i.e., the pressures or temperatures corresponding to the minimum (4 mA)
input and maximum (20 mA) inputs).
input and maximum (20 mA) inputs).
The offset and gain can be reset to the default values (0 and 1, respectively) by clicking the
Reset Defaults
button.
Click the
Edit Scaling
button to modify the input scaling.
From the
Current Calibration
screen, click the
Next
button to proceed to the
Calibration Method
screen to select between the offset and two-point calibration methods. The offset method
requires a single calibration point and only affects the input’s calibration offset parameter. The
two-point calibration requires calibrating at two different points (ideally far apart in value) and
affects the input’s calibration offset and gain parameters. Depending upon the selected
calibration method, either one or two screens will follow when the
requires a single calibration point and only affects the input’s calibration offset parameter. The
two-point calibration requires calibrating at two different points (ideally far apart in value) and
affects the input’s calibration offset and gain parameters. Depending upon the selected
calibration method, either one or two screens will follow when the
Next
button is clicked. The
screen(s) will show the current (live) reading. When the input is stable, click on the
Hold
button
to freeze the current reading. Enter the correct value in the
Actual
edit box. Finally, the
Finish
screen shows the new calculated offset and gain values. Click on the
Finish
button to write the
values to the meter. If the meter is not configured to use live values from the analog input for
calculation, a prompt is displayed asking if the configuration should be changed to use the live
input.
calculation, a prompt is displayed asking if the configuration should be changed to use the live
input.
Clicking the Reset Defaults button writes the offset and gain immediately - the previous
values cannot be restored.
values cannot be restored.
Changes to an analog input’s offset, gain, and scaling values are written to the audit log.