{"product_id":"mcdonnell-miller-120201-fs7-4w-1-1-4-flow-switch-with-nema-4x-enclosure","title":"McDonnell \u0026 Miller 120201 FS7-4W 1-1\/4\" Flow Switch with NEMA 4X Enclosure","description":"\u003cp\u003eProtect your critical liquid piping systems with the \u003cstrong\u003eMcDonnell \u0026amp; Miller FS7-4W\u003c\/strong\u003e, designed to accurately monitor flow and trigger alarms or shut-off sequences. This robust \u003cstrong\u003e120201\u003c\/strong\u003e model is specifically engineered to provide consistent detection of flow or no-flow conditions in industrial and commercial hydronic applications, ensuring peace of mind through reliable operation.\u003c\/p\u003e\u003cp\u003eThe unit operates using a precision-engineered paddle mechanism that detects changes in flow velocity within the pipe. When flow drops below the set point, the internal switch engages or disengages electrical circuits, providing a seamless integration with pump motor starters, valves, or process controllers.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnclosure Rating:\u003c\/strong\u003e NEMA 4X standard for superior protection against water ingress and corrosion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection Diameter:\u003c\/strong\u003e Designed for standard 1-1\/4 inch pipe installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperational Reliability:\u003c\/strong\u003e Rugged construction ensures longevity in demanding mechanical room environments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for monitoring liquid flow in chilled water systems, hot water heating setups, and industrial process cooling lines where environmental protection is critical.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43124294975582,"sku":"120201","price":723.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/120201_image_4b5ebd9e-1527-4e0f-a29e-89e3abd70c98.png?v=1786034694","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-120201-fs7-4w-1-1-4-flow-switch-with-nema-4x-enclosure","provider":"National Boiler Supply","version":"1.0","type":"link"}