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)
