The duct humidity and temperature transmitter DHT measures the humidity and temperature of air. The duct humidity and temperature transmitter DHT converts the measurements humidity and temperature into standard signals of 0-10 Vdc or 4-20 mA. Passive temperature sensor PT1000, PT100, NTC 10K, NTC 20K, NTC 1.8K, NI1000 as option The DHT duct humidity and temperature transmitter can be ordered with or without display. DIP switch on pcb to select relative humidity, absolute humidity, dew point or enthalpy measurement. The built-in display on room humidity and temperature transmitter DHT show actual humidity and actual temperature. Probe lenght for duct humidity and temperature transmitter DHT is 220 mm. Mounting flange is included in the scope of delivery for DHT duct humidity and temperature transmitter.