Dwyer Instruments: Series TDFS, Thermal Dispersion Flow Switch

Non-Mechanical, Low Pressure Drop

The SERIES TDFS Thermal Flow Switch uses impulse thermal dispersion measurement technique to indicate whether the flow rate is above or below a user set flow rate. It provides NO and NC NPN outputs and two LED, one green and one red for high and low set point indication.

SERIES TDFS Applications

  • Boiler flow proving
  • Hot water heaters
  • Chillers
  • Liquid transfer systems


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