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Series TDFS thermal dispersion flow switches from Dwyer Instruments

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The W.E. Anderson Division of Dwyer Instruments presents the new Series TDFS thermal dispersion flow switches designed to indicate whether the flow rate is above or below a user set flow rate with NO and NC NPN outputs.

The setpoint can be easily field set by simply tapping the magnet provided with the flow switches on the setpoint target three times at the desired flow rate.

Series TDFS thermal dispersion flow switches also incorporate two LED status indicators on opposite sides of the unit to provide visual switch indication with green indicating that the flow is above set point and red when the flow is below setpoint.

Series TDFS thermal flow switches use an impulse thermal dispersion measurement technique to measure the flow rate where the probe is heated above the process temperature and then is allowed to cool down to the process temperature.

Key features of Series TDFS thermal dispersion flow switches:

  • Empty pipe is not a problem with the TDFS unlike some competitor units that will overheat 
  • Better long term reliability and life expectancy than mechanical flow switches 
  • No paddles or vanes that can break off into the flow media 
  • No jams or materials to stop the paddle movement 
  • No seals on movement assembly to wear or leak 
  • Two LED status indicators provide visual switch indication

Questions about this article

26/11/2013 - The process connection on the TDFS series is 1/2" male NPT. The wetted materials of the TDFS series is 316SS, Polusulfone and FKM.

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