A75-101 Reed Switch Anemometer by COMPTUS®

A75-104 Anemometer.jpg
Comptus A75-104 Anemometer.jpg
A75-104 Anemometer.jpg
Comptus A75-104 Anemometer.jpg

A75-101 Reed Switch Anemometer by COMPTUS®

from 114.00

Proven and rugged anemometer with reed switch pulse output

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Primary replacement for #40 Anemometer in Wind Resource Assessment applications

  • Proven accuracy in an affordable analog wind speed sensor.

  • Durable construction with anodized aluminum and stainless steel

  • Low threshold speed, short distance constant and overspeeding

Calibrated sensors

All sensors come standard with factory calibration. An independent laboratory calibrated version with certificate per ISO/IEC 17025:2005 or MEASNET/IEC 61400-12-1:2005 is available per request. Calibration provides individual slope and offset values to configure the anemometer or your data logger. 


  • Research measurements in environmental studies

  • Engineering studies on wind effects on structures

  • Control anemometer for new or existing wind warning devices

  • Anemometer for wind resource assessment instrumentation


  • Reed switch pulse output.

  • Very simple, elegantly engineered construction

  • Dirt and water resistant, modified Teflon bearing system

  • All corrosion resistant materials

  • All three cups molded in one piece for repeatable performance

  • Professional quality at a minimum price


Proven dirt resistance and reliability with long service intervals over 20+ years

Proven years of reliability in wind energy application in highly dusty and dirty environments all around the world.

  • Optimized labyrinth and sliding bearings for dirt resistance.

  • Simple and reliable construction.


A75-101 Three Cup Anemometer reed switch outputPer IEC 61400-12-1 & IEC 61400-12-2:
Power performance measurements of wind turbines and on nacelle anemometry.
Type Accuracy Resolution Measuring range Environmental conditions range Starting wind speed Distance constant Survival wind speed
A75-101 Reed Switch Anemometer 2-10 MPH ±1 MPH (±0.45 m/s),
11-55 MPH ±0.2 MPH (±0.09 m/s) (Consensus Standard),
56 - 200 MPH +5% of Reading Threshold:
Analog output 0...214 MPH (96 m/s)


1.75 MPH (0.75 m/s) 10 ft (3 m) @ 5 m/s (11 MPH) 0...214 MPH (96 m/s)
Tilt angle sensitivity Cosine response, see graph. (for horizontal wind speed measurement)



Cups one piece injection molded black polycarbonate (Lexan) Body housing is black ABS plastic Shaft beryllium copper - fully hardened

Bearing modified Teflon, self-lubricating. Rated Pv factor of 20,000 (at 15 mph, Pv is approx. 500; at 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) dia., 13 mm (0.5 in) long, 4 poles

Comptus anemometer & wind vane technical specifications and dimensional drawings can be found in the data sheet link above.

Output signal Reed Switch: Maximum voltage 10VDC Maximum Current 10 mA Lifetime: 109 cycles. Output signal: Contact transfer rate varies linearly with wind speed. 120 contact transfers per second at 102.5 MPH
Supply Voltage 0...10VDC
Power consumption 0mA...10mA @ 0-10VDC (Based on logger and connection electrical configuration and cable length
Operating temperature -55°C to +60°C (-67°F to 150°F)
Operating humidity range 0% to 100% RH
Survival wind speed 96 m/s (214 MPH) continuous
Connection Wire terminals housed under a rubber boot
IP – Protection rating IP53W (DIN 40050)
SizeAnemometer = Ø190 mm (7.5 in), 3 cups of conical cross-section and Ø51 mm (Ø2 in), Total height = 51 mm (3.2 in)
Weight (Mass)Aprox. 100g (0.2 lb)without mount
Mounting Using a cotter pin on a 13 mm (0.5 in) diameter mast with a #35 hole 11 mm (.35 in) from the top. Tighten electrical terminals to 3 ounce-inches torque./td>

A sample wind speed MEASNET calibration certificate of the A75 Comptus anemometer showing accuracy levels per MEASNET/IEC 61400-12-1:2005.

A sample 1-45 m/s wind speed calibration test certificate showing full-scale linearity and accuracy levels of the A75 Comptus anemometer per ISO/IEC 17025:2005, IEC 61400-12-1, ISO 17713-1, ASTM D5096-02.