


Dwyer Instruments 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)
A thermal flow switch that shows whether the flow rate is above or below a user-set flow rate is the TDFS2-2-P-06-BSPT model, part of the Series TDFS2. The device has two LED status indicators that show the switch visually. The unit has both NO and NC NPN outputs, and the fixed flow rate (setpoint) can be readily changed in the field using the magnet that is included.

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Approvals | CE |
Connection | Electrical: 1/2' NPT female or cable gland with 4 conductor 22 AWG 6' (1.83 m) long (model selectable) |
Connection | Process: 1/2" NPT or BSPT male (model selectable) |
Current consumption [mA] | Average: 93 mA Peak: 300 mA |
Deadband | 0.1 ft/s (0.03 m/s) +15% of setpoint. |
Enclosure Rating | NEMA 4X (IP65) |
Housing Material | 316 SS, 416 SS, polycarbonate, neoprene, and acrylated urethane |
Input Power and Protection | 0.5A fuse (resettable) reverse polarity protected |
Manufacturer | Dwyer Instruments |
Material | Wetted: 316SS |
Maximum Operating Pressure | 300 psig (20.67 bar) |
Maximum operating temperature | 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) |
Power | 9 to 24 VDC |
Range | Pipe: 1/2 to 1-1/2" (15 to 40 mm) or 2 to 10" (50 to 250 mm) (model selectable) |
Range | Set Point: 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 |
Response Time | Approx. 8 s |
Switch Type | 1 NO NPN, 1 NC NPN |
Switched Output Protection | 0.5A fuse (resettable) reverse polarity protected |
Switching Current | 400 mA, de-rate 5 mA/°C above 23°C |
Type | Thermal Dispersion Flow Switch |
- Having no paddles or vanes to wear out or break, no jams in the paddle movement, and no movement assembly seals to wear out or leak means that mechanical flow switches are less reliable and have a shorter lifespan.
- Extended lifespan due to the fact that it remains unaffected by empty pipes by preventing overheating and cooling down to the process temperature.
- Reduced pressure drop with 10% insertion into the flow (e.g., 1/8" for 3/4" schedule 40 pipe) results in a lower system run cost.
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