Siemens Building Technology QFM3101 Sensor 318518-761 it ensures a precision fit

it ensures a precision fit for compatible Lennox

If the manometer shows negative pressure at the valve but it fails to open when 24VAC is applied

and stainless steel

As with all hermetic replacements

Siemens Building Technology QFM3101 Sensor 318518-761 it ensures a precision fitThe 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