User`s manual

NexSens Technology, Inc.
iSIC User‟s Manual 47
Differential (Isolated) 4-20mA Sensors
Connect differential 4-20 mA sensors to the internal analog terminal strip. A diagram of this is
shown below:
Pins AD0 through AD7 can all be used for connecting 4-20 mA sensors. Four 4-20 mA sensors
can be connected at the same time using these pins on the analog terminal strip.
It is necessary for a sense resistor to be added into the wiring for each sensor to convert the
current signal into a voltage signal. For your convenience, four 56 resistors are included with
the iSIC. The included resistors have a 1% accuracy. It is recommended you check the
documentation for your particular sensor to find the exact resistor requirements.