Reed Relays and
Electronics India Limited
Manufacturer of Reed Switches, Reed Sensors and Reed-based products
Reed Relays and Electronics India Limited Incorporated in 1971

Flow Sensor

A Flow Sensor or a Flow Meter, is a device used to quantify the volume of fluid passing through a point in a pipe. Reed Switch based flow sensors are built with a paddle having multiple magnets or a single multi-pole magnet that continuously triggers the reed switch to generate a square wave output that can be translated to volume of fluid.

Flow Meter
Flow_measurement (Wikipedia)

Flow measurement is the quantification of bulk fluid movement. Flow can be measured in a variety of ways. The common types of flowmeters that find industrial application can be listed as below:

  • a) Obstruction type (differential pressure or variable area)
  • b) Inferential (turbine type)
  • c) Electromagnetic
  • d) Positive-displacement flow meters, which accumulate a fixed volume of fluid and then count the number of times the volume is filled to measure flow.
  • e) Fluid dynamic (vortex shedding)
  • f) Anemometer
  • g) Ultrasonic
  • h) Mass flowmeter (Coriolis).

Flow measurement methods other than positive-displacement flowmeters rely on forces produced by the flowing stream as it overcomes a known constriction, to indirectly calculate flow. Flow may be measured by measuring the velocity of fluid over a known area. For very large flows, tracer methods may be used to deduce the flow rate from the change in concentration of a dye or radioisotope.

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