Humidity & Air Quality Selection of transmitters for sensing concentrations of humidity, carbondioxide and carbonmonoxide. CODE Description Files NCSRHR1 Room Humidity & Temperature Transmitter Datasheet NCSRHD1 Duct Humidity & Temperature Transmitter Datasheet NCSRHO1 Outdoor Humidity & Temperature Transmitter Datasheet NCSCO2R1 CO2 & Temperature Transmitter Datasheet NCSCO1 CO Transmitter Datasheet