Bb sensors drtr al series industrial pressure transmitters relative pressure bb sensors drtr al 10v r4b this industrial pressure transmitter is designed to measure up to 0 to 4 bar relative pressure and transmit the measured value in the form of a calibrated and temperature compensated standard signal of 0 to 10v 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 meas