Description
Dwyer SERIES TDFS2 THERMAL DISPERSION FLOW SWITCH
Non-Mechanical, Low Pressure Drop, Large Pipe Sizes
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.
Features:
- 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 due to low pressure drop with 10% insertion into the flow (e.g. 1/8″ for 3/4″ schedule 40 pipe)
Applications:
- Boiler flow proving
- Hot water heaters
- Chillers
- Liquid transfer systems
Specifications:
- Service: Compatible water-based fluids
- Wetted Materials: 316SS
- Pipe Range: 1/2 to 1-1/2″ (15 to 40 mm) or 2 to 10″ (50 to 250 mm) (model selectable)
- Set Point Range: 0.5 to 10 ft/s (0.15 to 3.0 m/s)
- Repeatability: 0.07 ft/s (0.02 m/s) +3% of setpoint
- Typical Deadband: 0.1 ft/s (0.03 m/s) +15% of setpoint
- Temperature Limits: Ambient: 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 Limits: 300 psig (20.67 bar)
- Response Time: Approx. 8 s.Power Requirement:9 to 24 VDC
- Switching Current: 400 mA, de-rate 5 mA/°C above 23°C
- Current Consumption: Average: 93 mA; Peak: 300 mA
- Electrical Connection: 1/2′ NPT female or cable gland with 4 conductor 22 AWG 6′ (1.83 m) long (model selectable)
- Process Connection: 1/2″ NPT or BSPT male (model selectable)
- Enclosure Rating: NEMA 4X (IP65)
- Housing Materials: 316 SS, 416 SS, polycarbonate, neoprene, and acrylated urethane
- Switch Type: 1 NO NPN, 1 NC NPN
- Input Power and Protection: 0.5A fuse (resettable) reverse polarity protected
- Switched Output Protection:0.5A fuse (resettable) reverse polarity protected
- Agency Approvals: CE.
Models:
- TDFS2-1-P-06 Thermal dispersion flow switch for pipe size 1/2 to 1-1/2″ (15 to 40 mm), 316SS, 1/2″ NPT process connection, 6′ of cable with cable gland. (Standard length)
- TDFS2-2-C-06 Thermal dispersion flow switch for pipe size 2 to 10″ (50 to 250 mm), 316SS, 1/2″ NPT process connection, 6′ of cable with conduit connection. (Extended length)
- TDFS2-2-P-06-BSPT Thermal dispersion flow switch for pipe size 2 to 10″ (50 to 250 mm), 316SS, 1/2″ BSPT process connection, 6′ of cable with conduit connection. (Extended length)
