PISTON TYPE How It Works HERMETICALLY SEALED SPDT SWITCH 0.5 GPM PERMANENT MAGNET PISTON 2.5 PRESSURE DROP (PSID) SPRING Pressure Drop - Typical HOUSING VALVE ADJUSTMENT LOCKING SET SCREW 2.0 1.5 Part No. 25357 1.0 0.5 0 FLOW ADJUSTMENT VANE 0 0.5 1.0 2.0 FLOW RATE - GPM MAGNETIC SWITCH 10 GPM and 20 GPM PRESSURE DROP (PSID) 16 ADJUSTMENT An externally rotatable vane is positioned in the main flow path within the unit. The magnet carrier piston is located in a bypass flow chamber. Pressure differential, caused by flow around the adjusting vane, displaces the spring-biased piston which actuates a hermetically sealed SPDT reed switch within the unit. 12 Part No. 25358 8 4 0 0 5 10 15 20 25 How To Order - Standard Models Specify Part Number based on desired media, piston material and electrical termination. Housing Liquids Gases Part Numbers With 1/2˝ With Lead Conduit Wires Connector Materials Media Piston Brass (for Oils) Brass 61205 49073 FS-10798 switches are U.L. Approved for Class I, Division 2, Groups A, B, C, D hazardous locations. U.L. Approved - File No. E183854 Standard Wiring Color Code 25357 25363 316 Stainless Steel 25358 25364 Wire Color Brass 25359 25365 Orange N.O. 316 Stainless Steel 25360 25366 Black Common Red N.C. Polysulfone (for Water) 30 FLOW RATE - GPM Tests conducted with units in horizontal position with water at +70°F (21°C). Data will vary slightly for vertically mounted units. FLOW SWITCHES Flow diagram with switch shown actuated. PISTON Notes: 1. Temperature changes will slightly affect the standard water or gas flow settings listed. Oil flow settings will vary with temperature and viscosity. 2. Use of 50 micron filtration is recommended. Terminal -- Stock Items. FS-10798 Series / p2of2 / 30-JUL-14 Visit www.GemsSensors.com for most current information. G-17http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/61205 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/49073 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/61205 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/49073 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25357 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25363 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25357 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25363 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25358 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25364 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25358 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25364 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25359 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25365 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25359 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25365 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25360 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25366 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25360 http://ecatalog.gemssensors.com/ecatalog/flow-switches/en/25366 http://www.GemsSensors.com