{"product_id":"thomas-products-18353-flow-switch-for-liquid-flow-monitoring","title":"Thomas Products 18353 Flow Switch for Liquid Flow Monitoring","description":"\u003ch3 data-section-id=\"17lc1ru\" data-start=\"0\" data-end=\"16\" class=\"PDq2pG_selectionAnchorContainer\"\u003eDescription:\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp data-start=\"18\" data-end=\"655\"\u003eThe Thomas Products 18353 Flow \u003ca href=\"https:\/\/plgautomation.com\/collections\/switches-circuit-protection\"\u003eSwitch\u003c\/a\u003e Model 1900 is used for monitoring low liquid flow and actuating electrical control circuits when a preset flow rate is reached. Commonly installed in laboratory equipment, cooling systems, medical devices, water treatment equipment, and industrial process controls, this in-line piston flow switch features a 1\/4-inch FNPT brass body with a factory-set 0.75 GPM increasing-flow set point and an SPDT reed switch. Maintenance teams and \u003ca href=\"https:\/\/plgautomation.com\/collections\/hmi-operator-interfaces\"\u003esystem integrators\u003c\/a\u003e use this part for repair, retrofit, expansion, and replacement of precision liquid flow monitoring systems. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5ms9th\" data-start=\"657\" data-end=\"674\"\u003eApplications:\u003c\/h3\u003e\n\u003cp data-start=\"676\" data-end=\"1174\"\u003eThe Thomas Products 18353 is designed for detecting low flow rates in water, oil, and other compatible liquids. It is widely used in OEM equipment, laboratory instrumentation, coolant circulation systems, medical equipment, industrial automation, and process control applications where accurate low-flow monitoring is essential. The compact piston design provides dependable switching performance while allowing flexible mounting in confined spaces. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5hg6bl\" data-start=\"1176\" data-end=\"1205\"\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cp data-start=\"1207\" data-end=\"2199\"\u003e• Manufacturer Part Number (MPN): 18353\u003cbr data-start=\"1246\" data-end=\"1249\"\u003e• Brand: Thomas Products Ltd.\u003cbr data-start=\"1278\" data-end=\"1281\"\u003e• Model: 1900 Series\u003cbr data-start=\"1301\" data-end=\"1304\"\u003e• Product Type: In-Line Piston Liquid Flow Switch\u003cbr data-start=\"1353\" data-end=\"1356\"\u003e• Housing Material: Brass\u003cbr data-start=\"1381\" data-end=\"1384\"\u003e• Process Connection: 1\/4 in FNPT (Both Ports)\u003cbr data-start=\"1430\" data-end=\"1433\"\u003e• Flow Set Point: 0.75 GPM Increasing Flow\u003cbr data-start=\"1475\" data-end=\"1478\"\u003e• Switch Logic: SPDT Reed Switch\u003cbr data-start=\"1510\" data-end=\"1513\"\u003e• Electrical Rating: 20 VA Pilot Duty\u003cbr data-start=\"1550\" data-end=\"1553\"\u003e• Operating Media: Water, Oil, and Compatible Liquids\u003cbr data-start=\"1606\" data-end=\"1609\"\u003e• Operating Pressure: Up to 1000 PSIG\u003cbr data-start=\"1646\" data-end=\"1649\"\u003e• Proof Pressure: 2000 PSIG\u003cbr data-start=\"1676\" data-end=\"1679\"\u003e• Burst Pressure: 4000 PSIG\u003cbr data-start=\"1706\" data-end=\"1709\"\u003e• Operating Temperature: -20°F to +250°F (High-temperature options available up to +400°F)\u003cbr data-start=\"1799\" data-end=\"1802\"\u003e• Wire Leads: 18 AWG, 24 in Polymeric Leads\u003cbr data-start=\"1845\" data-end=\"1848\"\u003e• Spring Material: 316 Stainless Steel\u003cbr data-start=\"1886\" data-end=\"1889\"\u003e• Mounting: In-line Pipe Installation with Optional Dual Mounting Holes\u003cbr data-start=\"1960\" data-end=\"1963\"\u003e• Set Point Accuracy: ±10% Maximum\u003cbr data-start=\"1997\" data-end=\"2000\"\u003e• Repeatability: 1% Maximum Deviation\u003cbr data-start=\"2037\" data-end=\"2040\"\u003e• Calibration: Factory calibrated in water at 70°F on increasing flow\u003cbr data-start=\"2109\" data-end=\"2112\"\u003e• Certifications: UL Recognized (File No. E86797) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"1cz0398\" data-start=\"2201\" data-end=\"2225\"\u003eCommon Replacements:\u003c\/h3\u003e\n\u003cp data-start=\"2227\" data-end=\"2460\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e• Thomas Products 18352\u003cbr data-start=\"2290\" data-end=\"2293\"\u003e• Thomas Products 18354\u003cbr data-start=\"2356\" data-end=\"2359\"\u003e• Thomas Products 18355\u003c\/p\u003e","brand":"THOMAS","offers":[{"title":"New","offer_id":51714010939694,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_68730e92-72a3-4e01-840a-7eded09a4eff.jpg?v=1770413688","url":"https:\/\/plgautomation.com\/products\/thomas-products-18353-flow-switch-for-liquid-flow-monitoring","provider":"PLG Automation ","version":"1.0","type":"link"}