Mid WestInstrument’s Model 121 transmitter provides low-cost, loop-powered,8-28 Vdc, two-wire 4-20 ma support for a variety of applications. Theunit features a 1/2″ NPT interface with an easy-to-wire industrialterminal strip and a removable cover.  Accuracy is  +/-2%from 20 percent to 100 percent of full scale. Temperature operatingrange is -20 F to 150 F (-20 C to 65 C). The unit also features apushbutton zero reset feature. Units available in pressure ranges from0-5 PSID (0-3 bar) to 0-110 PSID (0-7 bar).