this LFMMVM1-US model features a lead-free cast copper silicon alloy body

allowing you to set the damper to begin opening at a specific signal pressure (starting point) and reach full travel at a higher pressure (span)

we see these fail due to restricted airflow from oversized filters or blower motor degradation

They are not interchangeable as they require different sheave configurations

Addressing is typically managed via on-board DIP switches or through the programming interface of the host controller

Dwyer Instruments 1950-20-2F Pressure Switch 328140-751 this LFMMVM1-US model features aThe Dwyer Instruments 1950 20 2F Pressure Switch is a trade standard solution for monitoring differential pressure in hazardous locations. Engineered as an explosion proof alternative to the Series 1900, this unit integrates a weatherproof housing that meets NEMA 3, 7, and 9 ratings. With an adjustable range of 4 to 20" w. c. and a tight deadband of 0. 40 to 0. 60, it provides precise control for HVAC systems, fan proof of flow, and filter monitoring.