Sensor question for low freq
Because I have built so many remote sensors I used a SSM2142 600 ohm Diff line driver, but it needs +/- 15 volts to drive a 1K diff load 200 meters away. It needs +/- 18 volts to drive a distant 600 ohm load. Not needed here.







simulate this circuit &ndash; Schematic created using CircuitLab

I used 600 ohm STP cable with 22 awg wire as a twisted pair. Gives excellent AC (to 50 KHZ) and DC performance. You may need an op-amp to drive the SSM2142 as it does not have offset and gain trim built in, and its input impedance is only 10 K ohm.

In the schematic the 1K load divides the signal by 2, so the +/- 10 volt drive signal becomes +/- 5 volts at the isolation modules.

I am assuming you have DC power options at the sensor, but you have not clarified that.