These multifunctional HVAC transmitters measure temperature, relative humidity, CO, NO2 and ambient light level. They are optimised for indoor applications. All settings can be adjusted via Modbus RTU. Sentera CO - NO2 sensors transmit the measured values into an analogue output or a Modbus RTU register. The algorithm of the intelligent sensors control a single analogue output based on the measured temperature, relative humidity, CO or NO2 values. They can directly control an EC fan, an AC fan speed controller or a damper actuator.