FS-550 Series - High Pressure, Metal Paddle Switch Pipe Line Size: 1-1/4 and Up Primary Construction Material: Stainless Steel or Brass Setting Type: Fixed U.L. Recognized File No. E31926 CSA Listed -- File No. LR30200 and LR22666 FM Approved -- File No. 0A8A3.AE and 1H3A2.AX Standard FS-550 switches sense liquid flow in either direction to monitor flow/no-flow conditions. They are supplied in two paddle lengths. The paddle is trimmed during installation to permit switch actuation at the desired flow rate. As flow increases in a pipe, the paddle of the switch pivots to move out of the liquid path, producing less than 3 PSIG of pressure drop regardless of pipe size. Specifications Wetted Materials Housing Brass or 316 Stainless Steel Paddle 302 Stainless Steel Spring 316 Stainless Steel Other Wetted Parts Ceramic and Teflon(R) Operating Pressure, Maximum 2000 PSIG (138 bar) Pressure Drop 3 PSIG (0.2 bar) Maximum Operating Temperature -30F to + 300F (-34.4C to + 148.9C) Set Point Accuracy 25% Dimensions 1/2" NPT Switch* SPDT, 20 VA Repeatability 5% Electrical Termination No. 18 AWG, 24 L., Polymeric Lead Wires 3-7/16" (87.2 mm) *See "Electrical Data" on Page X-5 for more information. Standard Actuation and De-actuation Set Points FLOW SWITCHES 1-11/16" (42.8 mm) 1" NPT The Table below indicates paddle lengths which achieve switch actuation for specific flow rates. Approximate pipe line sizes are marked on paddle. Short Paddle Unit Long Paddle Unit Pipe Size Marked at Paddle Cut-Off Point 1-1/4 1-1/4 5 (3) 13 (8) 22 (15) 29 (22) 1-1/2 -- 15 (11) 28 (21) 2 -- -- 22 (15) 2-1/2 -- -- 3 -- -- 4 -- -- Pipe Line Sizes 1-1/2 2 2-1/2 3 4 1-1/2" 1-1/2" -3" (LONG) PADDLE 2" 2-1/2" 3" -- -- 38 (30) -- -- 27 (20) 48 (38) -- -- 21 (14) 40 (26) 52 (39) -- -- 31 (20) 45 (32) -- -- -- 39 (25) FS-550 switches are U.L. Approved for Class I, Division 2, Groups A, B, C, D hazardous areas. They are also available as FM-approved when used with GEMS Junction Boxes which are explosion-proof for Class I, Division 1, Groups B, C, D, E, F, G hazardous locations. LOAD Select switch type, paddle length and housing material, then specify adjacent part number. SPDT Standard Unit Long Short Housing Material Switch Operation Brass 316 S.S. Brass N.O. or N.C. 316 S.S. Part Numbers Standard 3-Pin J-Box 29609 56730 29608 56729 30641 66914 30640 61189 1-1/2" 2" 2-1/2" 3" VAC Using GEMS SAFE-PAK SAFE-PAK Relays and barriers, these switches provide FS-550 automatic flow/no SWITCH flow interlock and HAZARDOUS are intrinsically-safe AREA without explosion-proof housing and piping. U.L. Approved -- File No. E183854 Note: The FS-550 Switch is not recommended for use with 1 plastic tees. G-24 1" (25.4 mm) 1" (25.4 mm) How To Order - Standard Models Paddle Length 1-1/4" (SHORT) PADDLE Approximate Actuation and (De-Actuation) Flow Rates GPM Water All flow rate tests for the above table were conducted with the switch installed in a standard "T" fitting. For calculation of flow rates in pipe sizes larger than 5, a flow velocity of approximately 0.5 ft. per sec. actuates the switch with a full length (5 ) paddle. The paddle can be trimmed to achieve different actuation points. Switch Type 5-1/2" (139.7 mm) 1" Visit www.GemsSensors.com for most current information.