DMT.HT.1021 Duct Type Humidity and Temperature Transmitters; Humidity designed to give the humidity and temperature values (0 ... 100% RH / -20 ... + 80 C) as 0-10V, 2-10V, 0-20mA, 4,20mA signal output by mounting the humidity transmitter on the duct. DMT.HT.1021 Duct Type Humidity and Temperature Transmitters are used in many applications such as air handling units, hygienic air conditioners, pool dehumidifiers, greenhouses, storage areas, laboratories and data centers where humidity and temperature are monitored or controlled.