The 274B Three-Channel Sensor Multiplexor allows a single signal conditioner to operate as many as three (3) high-accuracy Baratron® sensors. The 274B provides heater power for the temperature-controlled sensors such as the new AA06A & AD06A, as well as 590, 690, and 698 pressure sensors, keeping all sensors at their specified operating temperature and waiting for selection for readout with the 670 signal conditioner.