Chapter 10: Configuring a 4 - 20mA Zone Type
NOTE:
The span entered by the user is not the
m
but rather the ratio between the normal curve and
the correction.
Setting the Calibration Zero and Calibration Span
Setting the calibration zero and calibration span ensures accuracy in the values being monitored by the
system in the event that an input is not calibrated.
What You Should Know
The calibration zero and calibration span only need to be entered if the input calibration is incorrect.
1. In edit mode, under the
General
tab, click on the edit field beside the
Cal. Zero
button.
2. Enter the zero calibration.
3. Click on the edit field next to the
Cal. Span
button.
4. Enter the calibration span.
How it Works: Calibration Zero and Calibration Span
Calibrating the zero and span errors allow the installer to correct the output of a sensor. A sensor output is
viewed as a linear function y = mx + b
Sensors that are not calibrated can generate span or zero errors as illustrated in the figures below:
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