Siemens Building Technology QFM3171 Sensor 322057-301 the internal bimetal disc has

the internal bimetal disc has likely failed and requires immediate replacement

Simplified Installation: Compact track-mount design with a pre-supplied MT212-4 track ensures quick integration into standard control panels

Rugged Construction: Built with a high-strength aluminum housing and synthetic coated fabrics for the diaphragm to withstand an ambient temperature range of -40 to 205°F

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

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 the internal bimetal disc hasThe 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