The 4-20mA output signal is an analog output signal commonly used in sensors. It is typically powered by DC voltage ranging from 8-32 VDC, which are widely available commercially.
Occasionally, 4-20mA output signals use a three wire configuration (+V, -V, +S), but the vast majority of modern 4-20mA output sensors employ a two-wire, loop powered configuration with a supply (+V) and ground (-V). The current (mA) is measured on the loop by reading the voltage across a known value resistor (often called a sense resistor).
Nearly all industrial level products from Core Sensors offer 4-20mA output options.
Wiring guides for 4-20mA output signal pressure transducers can be found here.
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