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