This is a 2-wire, 4-20 mA Current Transmitter that accepts signals from 350, 500, 1K, 2.5K and 5K ohm bridges and provides the amplification and common-mode rejection necessary to control the current drawn from a 8 to 40 Vdc source to produce the 4-20 mA output signal. The transmitter is designed for 0.5 to 4.0 mV/V bridge sensitivities. It has two internal reference voltages for powering the bridge. The 1.24 volt reference is used with 1K ohm and lower resistance bridges. The 2.5 volt reference is used with 2.5K and 5K ohm bridges.