the 157S series features an integral water column body

Compressor Protection: Filters out scale

Always view the rotation from the hub/shaft side

As a technician-grade HVAC replacement part

preventing nuisance breaker trips

Siemens Building Technology QFM3101 Sensor 322838-753 the 157S series features anThe Siemens Building Technology QFM3101 is a high precision duct relative humidity sensor designed for demanding building automation and HVAC control applications. Featuring a robust 4 20mA output signal, this sensor provides a linear 0 100% RH measurement with a strict 2% accuracy rating. Engineered for professional grade reliability, it functions as a direct functional cross for the HD2XMSX, ensuring seamless integration into existing control loops