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ICEFREE3A Anemometer
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The ICEFREE3A anemometer is an electrically heated wind-speed sensor, designed for ice-prone sites. The sensor provides an electrical output signal with frequency directly proportional to wind speed.

The ICEFREE3A is manufactured by Renewable NRG Systems and has an 8 m (26 ft) cable.

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Detailed Description

The ICEFREE3A monitors wind speed using a three-cup anemometer. Rotation of the cup wheel produces a sine-wave that is directly proportional to wind speed. The frequency of the sine wave is measured by the data logger pulse count channel, then converted to engineering units (mph, m s-1, knots).

Wiring Information

Gray Cable

  • Clear - Signal
  • Black - Reference
  • Shield - Shield

Red Cable

  • Black - Heater
  • White - Heater


Sensor 3-cup anemometer
Measurement Description Wind speed
Range 0 to 90 m s-1 (0 to 200 mph)
Sensor to Sensor Variation 99.7% of sensors fall within 4.3% of stated transfer function (based on over 800 samples)
Distance Constant 7.6 m (25 ft) for 63% recovery
Sensor Output Signal Range 0 to 155 Hz
Operating Temperature Range -40° to +60°C
Operating Humidity Range 0 to 100% RH
Supply Voltage 24 V ac/dc
Supply Current Inrush 8 A (maximum)
Supply Current Steady State 1 A at 20°C, 4 A under maximum thermal load (head frozen in clear ice then powered on)
Body Diameter 7.0 cm (2.75 in.)
Swept Diameter of Rotor 12.7 cm (5 in.)
Cable Length 8 m (26 ft)
Overall Assembly Height 22.4 cm (8.82 in.)
Weight 1.45 kg (3.2 lb)


Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Data Loggers

Product Compatible Note
CR1000 (retired)
CR200X (retired)
CR3000 (retired)
CR800 (retired)
CR850 (retired)

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