05305-L RM Young Wind Monitor AQ
Reliable, Accurate Wind Measurements
Suitable for air quality applications
weather applications water applications energy applications gas flux and turbulence applications infrastructure applications soil applications

Overview

The 05305 is a lightweight, high-performance wind-speed and wind-direction sensor designed specifically for your air-quality measurements. It is more responsive but less rugged than the other wind monitors. Manufactured by R. M. Young, this sensor is cabled for use with Campbell Scientific data loggers.

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Benefits and Features

  • Compatible with most Campbell Scientific data loggers
  • Constructed with thermoplastic material that resists corrosion from sea-air environments and atmospheric pollutants
  • Lower starting threshold, faster response, and higher accuracy than the other wind monitors
  • Meets or exceeds requirements of the following regulatory agencies: U.S. Environmental Protection Agency, U.S. Nuclear Regulatory Agency, and American Nuclear Society
  • Compatible with the LLAC4 4-channel Low-Level AC-Conversion Module, which increases the number of anemometers one data logger can measure
  • Compatible with the CWS900-series interfaces, allowing it to be used in a wireless sensor network

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Detailed Description

The 05305 is made out of lightweight, UV-stabilized thermoplastic with stainless steel and anodized aluminum fittings. The thermoplastic material resists corrosion from sea air environments and atmospheric pollutants. It uses stainless-steel precision-grade ball bearings for the propeller shaft and vertical shaft bearings.

The 05305 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 data logger applies a known precision excitation voltage to the potentiometer element. The output is an analog voltage signal directly proportional to the azimuth angle.

Designed specifically for air quality measurements, the 05305 provides a lower starting threshold, faster response, and higher accuracy than the other wind monitors. It meets or exceeds the requirements published by the following regulatory agencies:

  • U.S. Environmental Protection Agency—Ambient Monitoring Guidelines for Prevention of Significant Deterioration (PSD) and On-Site Meteorological Instrumentation Requirements to Characterize Diffusion from Point Sources
  • U.S. Nuclear Regulatory Agency—NRC Regulatory Guide 1.23 Meteorological Programs in Support of Nuclear Power Plants
  • American Nuclear Society—Standard for Determining Meteorological Information at Nuclear Power Plants

Specifications

Applications
  • General (Rain with light snow. Little or no riming or blowing sand. No salt spray.)
  • Air quality (Designed to meet specific government standards for air-quality applications.)
Sensor Helicoid-shaped, 4-blade propeller and fuselage-shaped sensor body
Measurement Description Wind speed and direction
Operating Temperature Range -50° to +50°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.)
Height 38 cm (15.0 in.)
Length 65 cm (25.6 in.)
Propeller Diameter 20 cm (7.9 in.)
Weight 1.1 kg (2.5 lb)

Wind Speed
Range 0 to 50 m/s (0 to 112 mph)
Accuracy ±0.2 m/s (±0.4 mph) or 1% of reading
Starting Threshold 0.4 m/s (0.9 mph)
Distance Constant 2.1 m (6.9 ft) 63% recovery
Output ac voltage (three pulses per revolution)

90 Hz (1800 rpm) = 9.2 m/s (20.6 mph)
Resolution (0.1024 m s-1) / (scan rate in seconds) or (0.2290 mph) / (scan rate in seconds)

Wind Direction
Mechanical Range 0 to 360°
Electrical Range 355° (5° open)
Accuracy ±3°
Starting Threshold 0.5 m/s (1.0 mph) at 10° displacement
Distance Constant 1.2 m (3.9 ft) 50% recovery
Damping Ratio 0.45
Damped Natural Wavelength 4.9 m (16.1 ft)
Undamped Natural Wavelength 4.4 m (14.4 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 data logger

Compatibility

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)
CR1000X
CR300
CR3000 (retired)
CR310
CR350
CR6
CR800 (retired)
CR850 (retired)

Additional Compatibility Information

Mounting

The 05305 can be attached to a crossarm via a 17953 NU-RAIL fitting or CM220 Right Angle Mounting Bracket. Alternatively, it can be attached to the top of a CM106B or a stainless-steel tripod via the CM216 Sensor Mounting Kit.

Data Logger Considerations

The 05305's propeller uses one pulse count channel on the data logger. 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 05305'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 is present in the CR9000X).

Frequently Asked Questions

Number of FAQs related to 05305-L: 13

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  1. Are replacement fins and nose cones available for the 05305-L?

    Yes.

  2. If the speed indicator on a wind monitor stops working, is there a part that can be replaced, or does the whole unit need to be replaced?

    This depends on what is broken. Typically, Campbell Scientific can repair the unit, and the user does not have to purchase a new one.

  3. If an existing wind set is replaced with a wind monitor (05103-L, 05103-45-L, 05106-L, 05305-L), will more than the multiplier and offset have to be changed in the data logger program?

    The measurement instructions will likely remain the same. However, in addition to the multiplier and offset, the type of pulse may change for the wind speed, and the excitation voltage may change for the wind direction. For an explanation of how the data logger needs to be programmed, see the instruction manual.

  4. What is the power consumption (mA) of the 05103-L, 05103-45-L, 05305-L, and 05106-L anemometers?

    The short answer is less than 0.01 mA. The wind speed signal requires no power. The wind direction portion of the sensor only uses a maximum of 0.5 mA when excited with 5 Vdc, and then it is only on for 0.016 s for every measurement. When the wind direction is measured every second (typical), the average current drain is less than 0.01 mA.

  5. Can the output of a wind monitor (05103-L, 05103-45-L, 05106-L, or 05305-L) be changed to analog dc voltage?

    No.

  6. What is the procedure for orienting a wind monitor (05103-L, 05103-45-L, 05305-L, or 05106-L) to the cardinal directions so that the wind direction readings are correct?

    Orientation of the wind monitor is done after the data logger has been programmed, and the location of True North has been determined. True North is usually found by reading a magnetic compass and applying the correction for magnetic declination, where magnetic declination is the number of degrees between True North and Magnetic North. Magnetic declination for a specific site can be obtained from a USFA map, local airport, or through a computer service.

  7. If a sensor automatically ships with a calibration sheet, what information is included on it?

    The information included on a calibration sheet differs with each sensor. For some sensors, the sheet contains coefficients necessary to program a data logger. For other sensors, the calibration sheet is a pass/fail report.

  8. Where are the available cable termination options listed for a particular sensor?

    Not every sensor has different cable termination options. The options available for a particular sensor can be checked by looking in two places in the Ordering information area of the sensor product page:

    • Model number
    • Cable Termination Options list

    If a sensor is offered in an –ET, –ETM, –LC, –LQ, or –QD version, that option’s availability is reflected in the sensor model number. For example, the 034B is offered as the 034B-ET, 034B-ETM, 034B-LC, 034B-LQ, and 034B-QD.

    All of the other cable termination options, if available, are listed on the Ordering information area of the sensor product page under “Cable Termination Options.” For example, the 034B-L Wind Set is offered with the –CWS, –PT, and –PW options, as shown in the Ordering information area of the 034B-L product page.

    Note: As newer products are added to our inventory, typically, we will list multiple cable termination options under a single sensor model rather than creating multiple model numbers. For example, the HC2S3-L has a –C cable termination option for connecting it to a CS110 instead of offering an HC2S3-LC model. 

  9. What are the different cable length choices available for Campbell Scientific sensors?

    Most Campbell Scientific sensors are available as an –L, which indicates a user-specified cable length. If a sensor is listed as an –LX model (where “X” is some other character), that sensor’s cable has a user-specified length, but it terminates with a specific connector for a unique system:

    • An –LC model has a user-specified cable length for connection to an ET107, CS110, or retired Metdata1.
    • An –LQ model has a user-specified cable length for connection to a RAWS-P weather station.

    If a sensor does not have an –L or other –LX designation after the main model number, the sensor has a set cable length. The cable length is listed at the end of the Description field in the product’s Ordering information. For example, the 034B-ET model has a description of “Met One Wind Set for ET Station, 67 inch Cable.” Products with a set cable length terminate, as a default, with pigtails.

    If a cable terminates with a special connector for a unique system, the end of the model number designates which system. For example, the 034B-ET model designates the sensor as a 034B for an ET107 system.

    • –ET models terminate with the connector for an ET107 weather station.
    • –ETM models terminate with the connector for an ET107 weather station, but they also include a special system mounting, which is often convenient when purchasing a replacement part.
    • –QD models terminate with the connector for a RAWS-F Quick Deployment Station.
    • –PW models terminate with the connector for a PWENC or pre-wired system.
  10. Using Short Cut, how can the average wind direction be calculated?
    1. Using Short Cut, click the applicable wind direction sensor in the Selected Sensors list of the Outputs screen.
    2. The two output options enabled are Sample and WindVector. Select WindVector.
    3. The WindVector instruction has output options. Select an option with mean wind direction in it.
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