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Siemens Building Technology QFM3171 Sensor 321894-709 What is the close-off pressureThe 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
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