in a wide variety of solutions The Model 9121 is designed to meet the need for an inexpensive, yet versatile, two-wire transmitter which produces a 4-20ma current output signal... stage mounted inside its case for direct electrode connection, or this portion of the circuit maybe removed and located nearer the sensor assembly. Model 9121 provides a well... instrument, the versatile continuous controls allow expansion of any 400mv (or greater) span to 4-20ma. SPECIFICATIONS POWER: +10 to +40V DC, 35mA quiescent current, plus 20mA...