Duct toxic gas sensor. It measures temperature, relative humidity, CO and NO2 in air ducts. The supply voltage is 24 VDC PoM - this means that Modbus RTU communication and 24 VDC power supply can be connected via one RJ45 connector. The measured values are transmitted via Modbus RTU communication. The CO - NO2 sensor element is replaceable. All settings can be adjusted via Modbus RTU.