The transmitters come in piston and diaphragm-sensor models with ratings of 1,500 to 5,000-psig line pressures. DP ranges are 0-5 to 0-1,000 psid for the piston version and 0-5 to 0-300 psid for the diaphragm model. A Hall-effect sensor transforms DP measurements into an electrical output. The transmitters provide voltage, current, frequency, or RS-232 output. Users select the desired output and a built-in temperaturecompensation makes sure transmitter output doesn't drift. The units can be installed as three or four-wire connections. Optional dials for local readout are available.