The Series TDFS2 Thermal Dispersion Flow Switch is a thermal flow switch that indicates whether the flow rate is above or below a user set flow rate. The unit incorporates two LED status indicators providing visual switch indication. The set flow rate (setpoint) is easily field adjustable with included magnet and the unit has both NO and NC NPN outputs. • Better reliability and life expectancy than mechanical flow switches with no paddles or vanes to wear or break, no jams in the paddle movement, and no seals on movement assembly to wear or leak • Long operation life, as it is not affected by empty pipe by avoiding overheating with heating above the process temperature and then cooling down to process temperature • Lower system run cost with low pressure drop with 10% insertion into the flow (e.g. 1/8˝ for 3/4˝ schedule 40 pipe) • Boiler flow proving • Hot water heaters • Chillers • Liquid transfer systems BENEFITS/FEATURES DESCRIPTIONAPPLICATIONS SERIES TDFS2 | W.E. ANDERSON THERMAL DISPERSION FLOW SWITCH ® SPECIFICATIONS ServiceCompatible water-based fluids. Wetted Materials316 SS. Pipe Range1/2 to 1-1/2˝ (15 to 40 mm) or 2 to 10˝ (50 to 250 mm) (model selectable). Set Point Range0.5 to 10 ft/s (0.15 to 3.0 m/s). Repeatability0.07 ft/s (0.02 m/s) +3% of setpoint. Typical Deadband0.1 ft/s (0.03 m/s) +15% of setpoint. Temperature LimitsAmbient: 5 to 140°F (-15 to 60°C); Process: 5 to 140°F (-15 to 60°C), Storage: -40 to 185°F (-40 to 85°C). Pressure Limits300 psig (20.67 bar). Response TimeApproximately 8 s. Power Requirement9-24 VDC. Switching Current400 mA, derate 5 mA/°C above 23°C. Current Consumption Average: 93 mA; Peak: 300 mA. Electrical Connection1/2˝ NPT female or cable gland with 4 conductor 22 AWG 6´ (1.83 m) long (model selectable). Process Connection1/2˝ NPT or BSPT male (model selectable). Enclosure RatingNEMA 4X (IP65). Housing Materials316 SS, 416 SS, polycarbonate, neoprene, and acrylated urethane. Switch Type1 NO NPN, 1 NC NPN. Input Power and Protection0.5 A fuse (resettable) reverse polarity protected. Switched Output Protection0.5 A fuse (resettable) reverse polarity protected. Agency ApprovalsCE. TDFS2-1-P-06 TDFS2-2-P-06©Copyright 2021 Dwyer Instruments, Inc. Printed in U.S.A. 4/21 DS-TDFS2 Rev. 3 ORDER ONLINE TODAY! dwyer-inst.com/Product/SeriesTDFS2 DWYER INSTRUMENTS, INC. Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identified in this publication without notice. Dwyer advises its customers to obtain the latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current. DIMENSIONSWIRING DIAGRAM HOW TO ORDER SERIES TDFS2: Thermal dispersion flow switch PIPE SIZE -1: 1/2 to 1-1/2˝ (15 to 40 mm) -2: 2 to 10˝ (50 to 250 mm) ELECTRICAL CONNECTION -C: 1/2˝ female NPT with PVC cable for conduit connection -B: Cable gland with burial rated cable -P: Cable gland with PVC jacketed cable CABLE LENGTH -03: 3 ft cable (0.91 m) -06: 6 ft cable (1.83 m) -10: 10 ft cable (3.05 m) -15: 15 ft cable (4.57 m) -20: 20 ft cable (6.07 m) -25: 25 ft cable (7.62 m) -30: 30 ft cable (9.14 m) -35: 35 ft cable (10.67 m) -40: 40 ft cable (12.19 m) -45: 45 ft cable (13.72 m) -50: 50 ft cable (15.24 m) OPTIONS -BSPT: 1/2˝ BSPT process connection TDFS2-1-P-06BSPT Use the bold characters from the chart below to construct a product code. POWER (RED) NO (WHITE) NC (GREEN) TDFS GROUND (BLACK) HOUSING (DRAIN WIRE) LOAD(S) DC SUPPLY 9-24 VDC EARTH GROUND + – ModelDescription 100571-00Replacement set point magnet ACCESSORIES TDFS2-1-P-06 TDFS2-2-P-06 SENSOR 1-1/8 HEX 1-29/32 [48.26] 2-25/32 [70.49] 5-5/8 [142.88] PROCESS CONNECTION 1/2˝ NPT OR BSPT SETPOINT TARGET STATUS INDICATOR CABLE GLAND CABLE 4-3/16 [106.17] 1-21/64 [33.78] 1-1/8 HEX SENSOR PROCESS CONNECTION 1/2˝ NPT SETPOINT TARGET STATUS INDICATOR CABLE GLAND CABLE 29/64 [11.68]Next >