{"product_id":"mcdonnell-miller-115400-fs6-3-4-3-4-high-sensitivity-flow-switch","title":"McDonnell \u0026 Miller 115400 FS6-3\/4 3\/4\" High Sensitivity Flow Switch","description":"\u003cp\u003eMaintain precise liquid flow monitoring in your hydronic or industrial piping systems with the high-sensitivity \u003cb\u003eMcDonnell \u0026amp; Miller 115400 FS6-3\/4\u003c\/b\u003e flow switch. This robust device is engineered to detect the presence or absence of flow in liquid lines, acting as a critical safeguard to prevent equipment damage due to low-flow conditions or system dry-running.\u003c\/p\u003e\u003cp\u003eThe unit functions through a paddle-actuated mechanism that triggers a switch when liquid movement pushes against the paddle. As flow increases, the paddle shifts to toggle the internal electrical contacts, providing reliable status feedback to controllers, pumps, or alarm circuits for total system protection.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eSensitivity Levels:\u003c\/b\u003e Optimized for high-precision detection in residential and commercial applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eConnection Standard:\u003c\/b\u003e Designed for seamless integration into 3\/4-inch NPT piping configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDurability Focus:\u003c\/b\u003e Built to withstand common hydronic pressure and temperature fluctuations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for use in boiler flow sensing, cooling tower water monitoring, hydronic heating loop protection, and industrial process cooling systems.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43124009107550,"sku":"115400","price":569.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/115400_image_03b99e1c-52d0-4329-ac2b-60f42e77c7e7.png?v=1786028078","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-115400-fs6-3-4-3-4-high-sensitivity-flow-switch","provider":"National Boiler Supply","version":"1.0","type":"link"}