User`s manual

NexSens Technology, Inc.
iSIC User‟s Manual 50
The importance of being able to turn on the SW12VA is that many analog sensors use the
SW12VA as their power supply. This check box must be checked in order for the sensors to work
properly.
When troubleshooting invalid readings from an analog sensor the first step should be to
determine if the sensor is outputting the correct voltage reading.
Note: that 4-20mA sensors use a 56 Ohm resistor, so their voltage range will vary from 224mV
at 4mA (4mA * 56 Ohm = 224 mV) to 1120mV (20mA * 56 Ohm = 1120 mV).