These multifunctional HVAC transmitters measure temperature, relative humidity, CO2 and ambient light levels. They are optimised for indoor applications and have a smooth, contemporary design that will fit seamlessly with most interiors. In many applications, the integrated light sensor can be used to control the ventilation system in function of the occupancy of the room. All settings can be adjusted via Modbus RTU. Sentera NDIR CO2 sensors transmit the measured values into an analogue output or a Modbus RTU register. The algorithm of the intelligent sensors controls a single analogue output based on the measured temperature, relative humidity and CO2 values. They can directly control an EC fan, an AC fan speed controller or a damper actuator.