The TP3801 smart sensor probe is a 200mm (8”) temperature probe for insertion into air conditioning ducts or thermowells in pipelines for temperature measurement. The smart sensor operates on a two wire non polarised connection to the TC5044 or TC6644 controller. Power and communications are supplied over the one pair of wires. Up to four sensors, including one TR3840 sensor can be connected to the same pair of non polarised wires. The TP3801 has a two pole dip switch for sensor application.