FLOW SWITCHES FS-3 Series - Compact, Low Flow Units for Clean Potable Water Applications Flow Rate Settings: Liquids: 0.05 GPM to 1.00 GPM Gases: 25 CFH to 12 CFM Port Size: 1/4 Male NPT Primary Construction Material: Noryl(R) Setting Type: Fixed These ultra compact switches have been specifically designed for reliable operation in clean post-filtered water. They are made primarily of Noryl(R), with all other wetted materials also FDA or NSF compliant. FS-3 switches are instrument-quality, yet affordably priced for pure water equipment...from U.V. Lamp switching to Filter Life Monitoring. Specifications U.L. RECOGNIZED -- FILE NO. E31926 Dimensions Wetted Materials* Housing and Barbs Piston Spring and Stop Pin Pressure Rating Operating Temperature Required Filtration Switch** Electrical Termination 1.00 (25.4 mm) Noryl(R) Noryl(R) and Epoxy 316 Stainless Steel 150 PSI @ 70F; 50 PSI @ 212F 0F to 212F (100C), Max. 50 Micron or Better SPST, N.O. Pilot Duty 20 VA, 120-240 VAC or VDC No. 22 AWG, 18 L., PVC Lead Wires .775 (19.7 mm) * Materials of construction are either FDA or NSF compliant. ** See "Electrical Data" on Page X-5 for more information. N.O. switches in No Flow condition are standard. Pressure Drop Data Typical P vs Flow Rate 4.10 (104 mm) P (PSI) 2 1.5 1 0.5 0 0 0.5 1 1.5 2 FLOW RATE (GPM, WATER) How To Order 1/4 MNPT PORTS (2) Specify the FS-3 Flow Switch using part numbers tabulated below. Set points other than those listed are available as special order; contact GEMS with your requirements. Switch Actuation Set Point for Gases Part Numbers for Liquids 5 PSI 100 PSI 0.05 165840 25 CFH 60 SCFH 165840-Air Special Requirements. 0.25 165841 1 CFM 2.6 CFM 165841-Air 0.50 165842 2.5 CFM 5.6 CFM 165842-Air 1.00 165843 5 CFM 12 CFM 165843-Air GEMS caters to OEM needs with special configurations, including Gas (Air) flow, and customer specified electrical terminations. Part Numbers for Gases Notes: 1. This device is designed to provide Flow/No Flow sensing. Tabulated set points specify maximum contact closure thresholds on increasing fluid flow. Re-establishment of a Normally Open contact occurs on decreasing fluid flow by 0 GPM. 2. Flow settings are based on a vertical position (inlet port down), using water (for liquids) or air (for gases) at +70F on increasing flow. Some variation in set point actuation will occur with other gases or liquids, and in other mounting orientations. 3. Use of 50 micron, or better, filtration is required. - Stock Items. F-4 Other port sizes available; please call factory. Switch Actuation Set Point for Liquids (GPM) www.gemssensors.com