Siemens Building Technology QFM3171 Sensor 322057-301 as the citrus-based formula is

as the citrus-based formula is non-corrosive and non-scratching

Industrial Build Quality: The NEMA 4X housing protects the electrical internals against moisture

selecting the correct orifice diameter is essential to match the specific capacity requirements of the burner or furnace

Always replace a HVAC pressure switch with one that matches the specific "Water Column rating labeled on the manufacturer's data tag to ensure the system trips at the correct threshold

Siemens Building Technology QFM3171 Sensor 322057-301 as the citrus-based formula isThe Siemens QFM3171 is a high precision duct relative humidity and temperature sensor designed for demanding HVAC applications where signal stability is paramount. Engineered for seamless integration into building automation systems (BAS), this unit provides dual 4 20mA output signals for both humidity and temperature, ensuring reliable data transmission even over long cable runs. For technicians performing retrofits, the QFM3171 serves as the direct