Model-TDFT

Thermal Dispersion Flow Transmitter for 1/2-2 in Pipes, 316L SS

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Models In Stock

Flow measurement in low flow applications
Continuous frequency signal from measured flow velocity
Low pressure drop
No moving parts

See Product Overview

Model-TDFT

From ^C$ 792.46

Models In Stock

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1 Variations available

See all series options below

Data Sheet

Product Overview

Applications Boilers, Fluid Measurement and Control, Oil, Refrigeration, Refrigeration Equipment
Electrical Connection M12 4 pin Male
Enclosure Material 316L Stainless Steel
Enclosure Ratings IP67
Media Compatibility Clean process / cooling water
Mounting Orientation Horizontal, Vertical
Operating Temperature, Max 158 °F
Operating Temperature, Min -4 °F
Output Frequency 5 to 74 Hz
Pipe Size, Min 0.5 in
Power Consumption max 50 mA
Pressure Limits Up to 362 psi
Measurement Pressure Type Gauge
Process Connection Size 1/2 in
Process Connection Type NPT Male
Process Temperature, Max 140 °F
Process Temperature, Min 14 °F
Repeatability ± 10%
Repeatability Note ± 10% at 68°F (20°C)
Response Time 1 to 10 s
Sensor Material 316L Stainless Steel
Series ID Model-TDFT
Storage Temperature, Max 158 °F
Storage Temperature, Min -40 °F
Supply Power Type DC
Supply Voltage 24 Vdc
Switch Rating 80 mA
Velocity, Max 3 ft/s
Velocity, Min 1 ft/s
Weight 124.5 g

Supported Applications

The Dwyer Series TDFT Thermal Dispersion Flow Switch is a continuous frequency output flow transmitter designed for low flow applications. With no moving parts, it delivers low pressure drop and reliable operation, making it well suited to chiller, boiler, and liquid transfer systems where water-based fluids must be monitored.

The transmitter fits pipe sizes from 1/2" to 2" (12.7 to 50 mm) and features a 316L SS housing for use in harsh environments. It is compatible with water-based fluids, so it is a natural fit for HVAC hydronic loops and process cooling and heating circuits.

Operating Conditions & Performance

The TDFT measures flow over a range of 1-3 ft/s (0.05-0.7 m/s) with a repeatability of ±10% at 68°F (20°C) and a response time of 1 to 10 s. Its continuous frequency output spans 5 to 74 Hz.

Process temperature: 14 to 140°F (-10 to 60°C).
Ambient temperature: -4 to 158°F (-20 to 70°C).
Storage temperature: -40 to 158°F (-40 to 70°C).
Pressure limit: 362 psi (25 bar).
Power requirements: 24 VDC.
Current consumption: <50 mA.
Output frequency: 5 to 74 Hz.
Electrical connection: 1 x M12.
Process connection: 1/2" NPT.
Enclosure rating: IP67.

The device is wetted only with 316L SS and weighs 0.274 lb (124.5 g). It carries CE and cULus approvals.

Configuration Options

The Series TDFT is supplied as a single transmitter configuration, the TDFT, so every unit shares the same 316L stainless steel construction, 1-3 ft/s (0.05-0.7 m/s) measurement range, 5 to 74 Hz frequency output, 24 VDC power requirement, and M12 electrical connection. There are no sensor-grade or output-signal options that differentiate one unit from another; capability is fixed by this common specification.

The M12 connector standardizes field wiring, and the IP67 enclosure rating is common to all units, keeping installation and spare-part planning simple.