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4. Next it is necessary to determine how much from the sensor measurement range (4–20 mA) is already
used by the current measurement. Here from the recorded current value then minimal reading value = 4mA
should be subtracted (in our example 5.12 mA – 4 mA = 1.12 mA)
5. Then subtraction value obtained in the previous point should be divided by 0.01mA that is the resolution
step of electric current measurements (in our example 1.12mA/0.01mA = 112). This is the measurement
range in step units that are already used by the sensor.
6. Next used electric current measurement step unit value should be multiplied by 0.003125mm that is the
value of one measurement step unit in millimeters (in our example 112*0.003125mm=0.35mm). The
obtained value should be rounded to 2 digits after the comma, and it is the measurement range used by the
sensor in millimeters (in our example 0.35mm);
7. Next, the used measurement range in millimeters should be subtracted from stem diameter measured in
point 1 (in our example 8mm-0.35mm=7.65mm) and here we obtain stem diameter value that
corresponds to 4mA electric current reading of the sensor
8. Then measurement value in millimeters should be determined that correspond to max electric current
measurement value 20mA. Sensor measurement range in millimeters is 5mm, so this value should be
added to the value obtained in point 7 to get the value corresponding to the 20mA electric current reading of
the sensor (in our example 7.65mm+5mm=12.65mm)
9. Finally, previously obtained millimeter values for 4mA and 20mA should be entered in Stem Micro-variation
sensor Conversion configuration in Aranet PRO base station graphical user interface section Sensors
à
SENSORS after that user will be able to see sensor measurements in mm of the stem diameter:
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