Model TDFT Thermal Dispersion Flow Transmitter

Product Applications

  • Chiller systems
  • Boiler systems
  • Liquid transfer systems


The Model TDFT Thermal Dispersion Flow Transmitter has continuous frequency output. It fits applications with pipe sizes from 1/2″ to 2″ (12.7 to 50 mm) and features 316L stainless steel housing for use in harsh environments.


ServiceCompatible water-based fluids.
Wetted Materials316L SS.
Range1-3 ft/s (0.05-0.7 m/s).
Repeatability±10% at 68°F (20°C).
Temperature LimitsAmbient: -4 to 158°F (-20 to 70°C), Process: 14 to 140°F (-10 to 60°C), Storage: -40 to 158°F (-40 to 70°C).
Pressure Limit362 psi (25 bar).
Response Time1 to 10 seconds.
Power Requirements24 VDC.
Current Consumption<50 mA.
Electrical Rating80 mA.
Output Frequency5 to 74 Hz.
Weight5 oz (0.14 kg).
Electrical Connections1 x M12.
Process Connection½” NPT.
Enclosure RatingIP67.
Housing Material316L SS.
Mounting OrientationsHorizontal or vertical.
Weight0.274 lb (124.5 g).
Agency ApprovalsCE.


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