PRESSURE TRANSDUCER, 4 to 20 mA Model : PS-93MA-XXBAR * 6 models : 2/5/10/20/50/100/400 bar. * Zero pressure - 4 mA, Full scale - 20mA. * Power supply : DC 9V to 30V. * 4 wires : 2 wires for power, two wires for signal.