In certain applications, you may want to apply a correction factor to the displayed value.
Example: if you want 1 volt of the input to equal 10 volts on the display
To do this, select Scale & Offset and enter 10 in the Scale box.
Offset
If you want the displayed value to be the input value plus 3 volts, then enter 3 in the Offset box.
If your input is 4 volts and you add 3 in the Offset box, your display will show 7 volts.
Scale and Offset
If you set both a Scale and an Offset, then APM will apply the Offset first, followed by the Scale.
Example: Applying a Scale of 0.01 and an Offset of 2 will result in the values to the right. By applying 20V to the meter, the displayed value would be (20V + 2) x 0.01 = 0.22V.
Full Linearization
Most of the APM meters include a 20-point linearization table that can be used to correct for non-linear sensors such as thermocouples and pressure transducers. (Image A)
Select Full Linearization to open the table.
Example: Due to the irregular shape of the silo, the 20-point linearization table is used to correct the non-linear signal from the sensor. The displayed value accurately shows the volume in the silo. High or low setpoints can be set, and the APM can be integrated into other systems for process control. (Image B)
Image B
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