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Series TDFS Thermal Dispersion Flow Switch

The Series TDFS is a thermal flow switch that indicates whether the flow rate is above or below a user set flow rate with NO and NC NPN outputs. Setpoint is easily field set, just tap the included magnet on the setpoint target three times at the desired flow rate and it’s done. Incorporated into the unit are two LED status indicators on opposite sides of the unit providing visual switch indication, green when the flow is above set point, red when the flow is below set point.

The TDFS uses 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. Empty pipe is not a problem with the TDFS unlike some competitor units that will overheat. Thermal flow switches can offer better long term reliability and life expectancy than mechanical flow switches.

TDFS Advantages over Mechanical Flow Switches

  • No paddles or vanes to break off into the flow
  • No jams or material stopping the paddle movement
  • No seals on movement assembly to wear or leak
  • Low pressure drop, only needs to be 10% into the flow (e.g. 1/8" for 3/4" schedule 40 pipe)

Testimonial

” I would like to put on record my appreciation of the service you provide. Your prompt delivery/collection service is very useful as it minimizes equipment downtime. I have always found the work carried out to be of the highest quality. The calibration paperwork received is always clear and concise. In short it has made our compliance with quality standards easier. I would recommend your calibration service to anyone.”
“ PERFECT is the most suitable word to describe their service “

“I did the Right Choice ,cost effective,Great Service”

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