This multifunctional duct transmitter measures temperature and relative humidity in air duct systems. The required supply voltage is: 18-34 VDC. This sensor features 2x analogue / modulating outputs (0-10 VDC / 0-20 mA / 0-100 % PWM) and Modbus RTU communication. The firmware can easily be updated thanks to the bootloader. All settings can be adjusted via Modbus RTU