Siemens Building Technology QFA4171 Outdoor Air Relative Humidity Temperature Sensor 4-20mA

Siemens QFA4171 Outdoor Air Relative Humidity Temperature Sensor is a multifunctional instrument to measure humidity and temperature in HVAC systems with high precision. This sensor operates from 13.5VDC to 35VDC and gives 4–20mA output signal independent of supply voltage. The QFA4171 performs all round environmental monitor by measuring temperatures from -40 degrees F to 158 degrees F with 0 to 100 percent R.H. It is constructed of resilient polycarbonate for harsh outdoor use. This sensor is commonly used with commercial and industrial HVAC systems in order to maximize system efficiency and indoor air quality.