Bb sensors drtr al series industrial pressure transmitters relative pressure bb sensors drtr al 20ma r2b5 this industrial pressure transmitter is designed to measure up to 0 to 25 bar relative pressure and transmit the measured value in the form of a calibrated and temperature compensated standard signal of 4 to 20ma as a result of the precise calibration at 7 measurement points at 3 different temperatures the unit has excellent precision and very low temperature residual error ideal for