05108-45-L Wind Monitor-HD, Alpine Version
Reliable, Accurate Measurements with Low Maintenance
Suitable for alpine applications
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications

Overview

The 05108-45 Wind Monitor-HD is a lightweight instrument that measures wind speed and wind direction. It is designed to prevent ice buildup, allowing the sensor to provide accurate measurements in harsh alpine conditions with limited access. Manufactured by R. M. Young, this wind monitor is cabled for use with Campbell Scientific dataloggers.

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Benefits and Features

  • Compatible with most Campbell Scientific dataloggers
  • Discourages ice-buildup with a black sensor housing that is covered with an ice-resistant coating
  • Extremely long-wearing, corrosion-resistant, oversized ceramic bearings to increase service life many times longer than standard stainless-steel bearings
  • Oversized propeller shaft
  • High-pitch propeller
  • Locking propeller nut
  • Sealed, heavy-duty cable pigtail
  • Rugged enough for harsh environments
  • Compatible with the CWS900-series interfaces, allowing it to be used in a wireless sensor network
  • Compatible with the LLAC4 4-channel Low Level AC Conversion Module, which increases the number of anemometers one datalogger can measure

The "-L" on a product model indicates that the cable length is specified at the time of order.

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Detailed Description

The 05108-45-L Wind Monitor-HD is made from rigid UV-stabilized thermoplastic with stainless steel and anodized aluminum fittings. The thermoplastic material resists corrosion from sea air environments and atmospheric pollutants.

To make it more durable, the HD uses extremely long-wearing, oversized ceramic bearings to increase service life many times longer than standard stainless-steel bearings. The wind monitor's ceramic bearings are resistant to corrosion in environments that are hostile to steel bearings, making the 05108-45-L suitable for harsh alpine applications. To discourage ice buildup, the sensor's housing is black and covered with an ice-resistant coating. The HD also has an oversized propeller shaft, high-pitch propeller, locking propeller nut, and sealed, heavy-duty cable pigtail instead of the standard junction box—all features that further enhance the long-term reliability of the sensor.

The 05108-45-L measures wind speed with a helicoid-shaped, four-blade propeller. Rotation of the propeller produces an ac sine wave that has a frequency directly proportional to wind speed. The ac signal is induced in a transducer coil by a six-pole magnet mounted on the propeller shaft. The coil resides on the non-rotating central portion of the main mounting assembly, eliminating the need for slip rings and brushes.

Wind direction is sensed by the orientation of the fuselage-shaped sensor body, which is connected to an internal potentiometer. The datalogger applies a known precision excitation voltage to the potentiometer element. The output is an analog voltage signal directly proportional to the azimuth angle.

Specifications

Operating Temperature Range -50° to +60°C (assuming non-riming conditions)
Mounting Pipe Description
  • 34 mm (1.34 in.) OD
  • Standard 1.0-in. IPS schedule 40
Housing Diameter 5 cm (2.0 in.)
Propeller Diameter 18 cm (7.1 in.)
Height 40 cm (15.7 in.)
Length 57 cm (22.4 in.)
Weight 1.0 kg (2.2 lb)

Wind Speed

Range 0 to 100 m/s (0 to 224 mph)
Accuracy ±0.3 m/s (0.6 mph) or 1% of reading
Starting Threshold 1.0 m/s (2.2 mph)
Distance Constant 2.7 m (8.9 ft) 63% recovery
Output ac voltage (three pulses per revolution)

90 Hz (1800 rpm) = 8.8 m/s (19.7 mph)
Resolution (0.0980 m s-1)/(scan rate in seconds) or (0.2192 mph)/(scan rate seconds)

Wind Direction

Mechanical Range 0 to 360°
Electrical Range 355° (5° open) electrical
Accuracy ±3°
Starting Threshold 1.0 m/s (2.2 mph) at 10° displacement
Distance Constant 1.3 m (4.3 ft) 50% recovery
Damped Natural Wavelength 7.4 m (24.3 ft)
Undamped Natural Wavelength 7.2 m (23.6 ft)
Output
  • Analog dc voltage from potentiometer (resistance 10 kohm)
  • Linearity is 0.25%.
  • Life expectancy is 50 million revolutions.
Voltage Power switched excitation voltage supplied by datalogger
Damping Ratio 0.25

Compatibility

Mounting

The 05108-45-L can be attached to a crossarm via a 17953 Nu-Rail Crossover Fitting or CM220 Right-Angle Mounting Bracket. Alternatively, it can be attached to the top of a CM106B or stainless-steel tripod via the CM216 Sensor Mounting Kit.

Wind Profile Studies

Wind profile studies measure many wind sensors. For these applications, the LLAC4 4-Channel Low Level AC Conversion Module can be used to increase the number of Wind Monitors measured by one datalogger. The LLAC4 allows datalogger control ports to read the wind speed sensor’s ac signals instead of using pulse channels. Dataloggers compatible with the LLAC4 are the CR200(X) series (ac signal ≤1 kHz only), CR800, CR850, CR1000, CR3000, and CR5000.

Datalogger Considerations

The 05108-45's propeller uses one pulse count channel on the datalogger. Its wind vane requires one single-ended channel and access to an excitation channel. (The excitation channel can be shared with other high-impedance sensors.)

Programming

The 05108-45's propeller is measured by the PulseCount Instruction in CRBasic and by Instruction 3 (Pulse Count) in Edlog. The wind vane is measured by the BrHalf Instruction in CRBasic and by Instruction 4 (Excite-Delay-SE) in Edlog. The measurements are typically processed for output with the Wind Vector instruction (not present in the CR500 or CR9000 but present in the CR9000X).

Compatible Contemporary Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR9000X CR300 Series CR6 Series

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X
* *

*Measurements are typically processed for output with the Wind Vector instruction, which is not present in the CR500 or CR9000.

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