WS2R Reed Switch Wind Speed Sensor / Cup Anemometer

Regular price $69.00 USD
Sale price $69.00 USD Regular price

Inspeed's WS2R reed switch wind speed sensor is built with precision components to provide years of accurate weather monitoring.

Features You'll Love:

  • Wire length variants to suit different applications
  • Sapphire bearing provides exceptional sensitivity to gentle breezes and long life
  • Zero power to operate
  • Use it anywhere - home, RV, mobile or fixed installations.
  • Thousands in use across the world
Product Details

Inspeed's "WS2R" Reed Switch Wind Speed Sensor - Anemometer

Inspeed's rugged and affordable WS2 Anemometer is a high quality, Inspeed-designed, Made In America wind speed sensor a variety of options available so it will be sure to be a great fit for your application.  These options include:

  • Sensor type:  reed switch or non-contacting "infinite life" Hall chip
  • Mounting:  vertical bracket or 1/2" tube mount
  • Rotor:  polycarbonate or metal
  • Wire length:  standard lengths or customized for you

The WS2 wind speed sensor uses either a zero power reed switch (WS2R) or a Hall chip (WS2H) as the active element, with a magnet on the shaft that causes one pulse per rotation.  (If you want 2 pulses per rotation we can do that too - let us know).

The conversion factor from pulse rate to wind speed is in the specifications below.  Visit the WS2H Hall Sensor page for the Hall sensor anemometer.

The difference between the Reed Switch and Hall Sensor is as follows:

  • Power required:  Reed Switch:  0.  Hall Chip:  ~3mA 
  • Life:  Reed switch:  depends on voltage/current applied (lower=longer).
             Hall chip:  basically infinite

NOTE:  Both the reed switch and Hall PCB are replaceable items.

Battery-powered applications might be better off with a reed switch anemometer whereas the Hall chip might be a better choice for situations where power is available.

The base product has 25' of wire for the reed switch, but we offer standard options for 50', 100', and 200' feet.  If you need more, or less - reach out to us - we can do up to 1,000' or more!

The shaft has a Tungsten Carbide ball pressed into the end, which rides on a small sapphire.  The result is very low friction - for low wind speed sensitivity, and basically zero wear - for long life.

The polycarbonate rotor is designed by Inspeed based on years of experience with some tough users (mainly storm chasers!). It is light and strong - to give you years of dependable service.  If you prefer a metal rotor, we can do that too.

The mounting bracket can be attached to just about anything so it is easy to get up and running.  the single-screw mount to the head means that you can pivot the head relative to the bracket if you need to make fine adjustments to make the rotor completely level.  Alternatively we offer a tube mount base so it can be mounted to a 1/2" tube (available separately from Inspeed or customer-provided).

The Inspeed WS2R anemometer is based on simplicity, ruggedness, and a commitment to precision and accuracy.


Speed Range

~3 mph to 200 mph (~5 kph to over 200 kph)

Mounting Bracket

  • Supplied with an aluminum mounting bracket with 2 holes for screws.
  • Made from 1/8" x 1/2" aluminum bar stock
  • Designed to be mounted on top of a pole or other bracket.
  • Vertical bracket for anemometers/vanes, offset bracket for the E-Vane
  • Custom brackets available up request
  • Single screw head mounting means the bracket can be tilted to keep the head horizontal

Rotor Diameter

~6 in (150 mm)

Sensor Type

Inspeed offers 3 sensor types: reed switch, Hall, and Optical

  • Reed switch/magnet provide 1 pulse per rotation (more available on request)
  • Hall chip anemometers provide 1 pulse per rotation (same)
  • Hall chip E-Vanes provide 5-95% of the input voltage (3-24VDC)
  • Optical anemometers provide 8 pulses per rotation


  • Standard length is 25 feet (8m)
  • Additional options include 50 ft (15 m) and 100 ft (30 m) or more
  • Custom lengths available upon request - tested OK to over 1,500 feet
  • The wire is provided stripped and unterminated (except FlexWire and Mag Mount which have jack connections)

WS2R Reed Switch Owners Instructions

Here are the instructions for Inspeed WS2R Reed Switch wind speed sensors:

Link: WS2R Reed Switch Sensor Instructions

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