KLK duct humidity transmitters measure the relative humidity and temperature inside ventilation ducts. They are designed for high and low humidity applications in non-condensing environments. They are typically used in building automation systems to measure and control humidity in locations where relative humidity must be kept constant.

These transmitters feature a wide humidity measurement range and a wide temperature measurement range. A custom measurement range (lower and upper limits) can be set separately for both humidity and temperature measurement.

The transmitter has a humidity output and a temperature output. It is possible to select the output signal mode separately for each output during commissioning. The available output signal modes are voltage (V DC) and current (mA). The voltage output is scalable.

The transmitter features a PI controller. It is possible to use one of the outputs as a control output to maintain the humidity or temperature within the configured range. The controller allows the output to be controlled according to a measurement value or according to the selection of the maximum of all values.

All models can be commissioned using the ML-SER commissioning tool.