{"product_id":"mcdonnell-miller-113200-fs-1-1-2-liquid-flow-switch","title":"McDonnell \u0026 Miller 113200 FS-1 1\/2\" Liquid Flow Switch","description":"\u003cp\u003eProtect your hydronic equipment from damage caused by insufficient flow with the reliable \u003cstrong\u003e113200 FS-1\u003c\/strong\u003e liquid flow switch by McDonnell \u0026amp; Miller. This precision-engineered device is designed to monitor flow rates in various piping systems, triggering electrical contacts to ensure pumps, heaters, or cooling systems remain protected during unexpected flow fluctuations.\u003c\/p\u003e\u003cp\u003eThe unit functions by utilizing an internal paddle mechanism that detects liquid movement within the pipe. When the flow drops below or rises above the set threshold, the switch acts to open or close an electrical circuit, providing a critical feedback loop for automated system control and emergency shutdown safety protocols.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Sensing:\u003c\/strong\u003e Reliable detection of flow status to safeguard expensive boiler and chiller equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRugged Construction:\u003c\/strong\u003e Built to withstand demanding industrial and commercial HVAC environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimplified Installation:\u003c\/strong\u003e Designed for straightforward integration into existing 1\/2\" NPT piping configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety Assurance:\u003c\/strong\u003e Provides consistent, repeatable switching actions to prevent dry-fire or overheating conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for monitoring water flow in chilled water systems, hot water boilers, liquid transfer lines, and booster pump installations requiring positive flow confirmation.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43123957989470,"sku":"113200","price":358.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/113200_image_becc235a-bf63-461a-ae0d-ef1f43b21bc5.png?v=1786026064","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-113200-fs-1-1-2-liquid-flow-switch","provider":"National Boiler Supply","version":"1.0","type":"link"}