{"product_id":"mcdonnell-miller-120601-fs8-w-1-flow-switch","title":"McDonnell \u0026 Miller 120601 FS8-W 1\" Flow Switch","description":"\u003cp\u003eMaintain precise control over your hydronic heating or process cooling systems with the \u003cstrong\u003eMcDonnell \u0026amp; Miller 120601\u003c\/strong\u003e, also recognized as the \u003cstrong\u003eFS8-W\u003c\/strong\u003e 1-inch flow switch. This robust device is engineered to monitor liquid flow effectively, triggering a response when flow rates deviate from operational standards to protect critical system components from dry-firing or flow failure.\u003c\/p\u003e\u003cp\u003eThe unit utilizes a precision-engineered paddle mechanism that extends into the piping, sensing the physical movement of the fluid. As flow fluctuates, the mechanical force acts upon the paddle to open or close an internal electrical circuit, providing a reliable, automated safety interlock for pumps, burners, or alarms.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow Sensing Reliability:\u003c\/strong\u003e Consistent mechanical actuation designed for long-term hydronic service.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRugged Construction:\u003c\/strong\u003e Built to withstand the rigors of industrial and commercial piping environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety Interlocking:\u003c\/strong\u003e Ideal for preventing equipment damage by disabling systems during low-flow conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Primarily used in commercial HVAC installations, chiller circuits, liquid cooling systems, and large-scale boiler loops to safeguard circulating pumps and heating elements.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43124295041118,"sku":"120601","price":338.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/120601_image_b96154e0-9400-4329-8a50-467d64bd92f6.png?v=1786034710","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-120601-fs8-w-1-flow-switch","provider":"National Boiler Supply","version":"1.0","type":"link"}