Anemometer – ET-40RS

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This 3 Cup Reed Switch Anemometer is an improved version of the popular three-cup design that has been used in wind assessments for decades, manufactured to precise industry standards. The rotor is made of tough polycarbonate for exceptional durability and reliability. The anemometer base is also made of rugged polycarbonate, making it more resistant to damage during installation and use.

Manufactured in the USA with exceptional quality control—all units are tested mechanically and electronically before shipping. The sensor is made entirely of Lexan, a strong plastic that makes the anemometer less likely to break during installation and operation. Its distinctive vinyl boot shields wiring for long-term performance. Additionally, it is manufactured to meet new standards and is RoHS-compliant— no toxic metals.

Contact us or call us at (413) 835-5387 with questions about your application.

Features

  • RoHS compliant, elegantly engineered construction
  • Dirt and water resistant, modified Teflon bearing system
  • Built with corrosion resistant materials
  • All three cups molded in one piece for repeatable performance

Applications

  • Anemometer for wind resource assessment instrumentation
  • Research measurements in environmental studies
  • Engineering studies on wind effects on bridges, skyscrapers
  • Control anemometer for new or existing wind warning devices

Specifications

  • Accuracy
    • 3 m/s to 25 m/s (+/- 0.1 m/s)
      • < 3 m/s (+/- 0.2 m/s)
      • > 25 m/s (+/- 1% of reading)
    • 7 MPH to 55 MPH (+/- 0.2 MPH)
    • Measurement Range – 0.75 m/s to 80 m/s (1.75 MPH to 180 MPH)
  • Threshold
    • Starting – less than 0.75 m/s (1.75 MPH)
    • Cup Distance Constant – 3.0m (10 ft.) 63% recovery
  • Materials
    • Rotor and Housing Body – Injection molded black polycarbonate
    • Shaft – Beryllium  Copper (Fully Hardened)
    • Bearing – Modified Teflon, self-lubricating
    • Rated PV factor of 20,000 (at 6.7 m/s or 15 MPH, PV is approx. 500; at 45 m/s or 100 MPH PV is approx. 2,000)
    • Upper Bearing is centered in the plane of cup thrust for optimal loading
    • Permanent Magnet Indox – 1, 25 mm (1 in.) diameter, 13 mm (0.5 in.) long, 4 pole
  • Weight
    • 0.1 kg (0.2 lbs.)
  • Dimensions
    • 3-Cup Conical Cross Section – 51 mm (2 in.) diameter
    • Swept Diameter of Rotor – 190 mm (7.5 in.)
    • Overall Height – 81 mm. (3.2 in.)
    • Moment of Inertia of rotor assembly – 68 x 10-6 S – ft^2
  • Electrical
    • Reed Switch
      • Maximum Voltage – 10VDC
      • Maximum Current – 10 mA
      • Lifetime 10^9 cycles
    • Output Signal
      • Contact transfer rate varies linearly with wind speed.
      • MPH = 0.8542 * y – where y is the number of contact transfers per second.
      • m/s = 0.3818 * y – where y is the number of contact transfers per second
  • Environmental 
    • Operating Temperature – -55C to 65C (-67F to 150F)
    • Operating Humidity – 0-100% RH
    • Gust Survival Speed – 232 MPH
    • Lifespan – 3-5 years under normal circumstances
  • Mounting
    • Using cotter pin on a 13 mm. (0.5 in.) diameter mast with a #35 hole 11 mm (.35 in) from the top