{"product_id":"mcdonnell-miller-120160-fs7-4s-1-1-4-stainless-steel-flow-switch","title":"McDonnell \u0026 Miller 120160 FS7-4S 1-1\/4\" Stainless Steel Flow Switch","description":"\u003cp\u003eProtect your hydronic heating and cooling systems from flow-related damage with the \u003cstrong\u003e120160 FS7-4S\u003c\/strong\u003e flow switch from McDonnell \u0026amp; Miller. This robust flow-sensing device is designed to monitor liquid movement in pipelines, providing an electrical signal when flow starts or stops to ensure system safety and efficiency. Built with premium materials for longevity, the \u003cstrong\u003eFS7-4S\u003c\/strong\u003e is a trusted component for demanding HVAC and process piping applications.\u003c\/p\u003e\u003cp\u003eThis flow switch utilizes a paddle-actuated mechanism that sits directly in the media stream. When fluid moves at a specified rate, the paddle deflects, mechanically actuating a precision-engineered switch inside the housing. This simple yet reliable design provides consistent feedback to your control system, alerting operators or automating equipment shutdown if flow conditions fall below safe operating levels.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Heavy-duty stainless steel body resists corrosion in harsh industrial environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePositive Actuation:\u003c\/strong\u003e Precision switch mechanism ensures reliable signaling across varying flow rates.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroad Compatibility:\u003c\/strong\u003e Engineered for seamless integration into standard 1-1\/4\" pipe configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Application:\u003c\/strong\u003e Suitable for use in liquid-based cooling, heating, and process control loops.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for monitoring flow in industrial chillers, hydronic boilers, liquid distribution headers, and critical cooling pump circuits where equipment protection is vital.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43124294877278,"sku":"120160","price":894.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/120160_image_68ffb81a-9572-41f2-92f9-1e9606aac532.png?v=1786034678","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-120160-fs7-4s-1-1-4-stainless-steel-flow-switch","provider":"National Boiler Supply","version":"1.0","type":"link"}