BASI´s temperature transmitter BTT781 is part of a revolutionary new project for the smallest (in-head) and cheapest programmable transmitter. It has a input accepting Pt100 RTD and a 4-20mA 2-wire output linearly proportional to the measured temperature. This model allows on-site selection of input range and conversion direction as well as sensor failure reaction and no user calibration is necessary to be provided.BTT781 is available in a case for mounting inside sensor protection head type “B”, in a watertight box with high protection class. The RS232 serial interface allows fast and easy configuration. Thanks to the combination of performance, reliability, simplicity, flexibility, and low price, the BTT781 transmitter is easy-to-use and very widely applicable.