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Overview

The 03002, manufactured by R. M. Young, measures wind speed and direction with a 3-cup anemometer and a wind vane mounted on a small crossarm. It interfaces directly with Campbell Scientific dataloggers; no signal conditioning is required.

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Benefits and Features

  • Compatible with most Campbell Scientific dataloggers
  • Designed for continuous, long term, unattended operation in adverse conditions
  • Ideal for wind profile studies
  • Compatible with the LLAC4 4-channel Low Level AC Conversion Module, which increases the number of anemometers one datalogger can measure
  • Campbell Scientific version uses shielded bearings, which lowers the anemometer's starting threshold
  • Compatible with the CWS900-series interfaces, allowing it to be used in a wireless sensor network

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 03002 uses a cup wheel assembly to measure wind speed. Rotation of the cup wheel produces an ac sine wave that is directly proportional to wind speed. The frequency of the ac signal is measured by a datalogger pulse count channel, then converted to engineering units (mph, m/s, knots). Campbell Scientific’s version uses shielded bearings, which lowers the anemometer’s threshold.

Wind direction is sensed by a potentiometer. With the precision excitation voltage from the datalogger applied to the potentiometer element, the output signal is an analog voltage that is directly proportional to the azimuth angle of the wind direction.

Specifications

General

Operating Temperature Range -50° to +50°C (assuming non-riming conditions)
Overall Height 32 cm (12.6 in.)
Crossarm Length 40 cm (15.7 in.) between instruments (center-to-center)
Mounting Diameter 34 mm (1.34 in.); mounts on standard 1-in. IPS pipe

Wind Speed (Anemometer)

Range 0 to 50 m/s (0 to 112 mph)
Gust Survival 60 m/s (134 mph)
Sensor 12-cm diameter cup wheel assembly, 40-mm diameter hemispherical cups
Accuracy ±0.5 m/s (1.1 mph)
Turning Factor 75 cm (2.5 ft )
Distance Constant 2.3 m (7.5 ft) 63% recovery
Threshold 0.5 m/s (1.1 mph)
Transducer Stationary coil (1300 ohm nominal resistance)
Transducer Output AC sine-wave signal induced by rotating magnet on cup wheel shaft 100 mV peak-to-peak at 60 rpm (6 V peak-to-peak at 3600 rpm)
Output Frequency 1 cycle per cup wheel revolution (0.75 m/s per Hz)
Cup Wheel Diameter 12 cm (4.7 in.)
Weight 113 g (4 oz)

Wind Direction (Vane)

Mechanical Range 360°
Electrical Range 352° (8° open)
Sensor Balanced vane; 16 cm turning radius
Accuracy ±5°
Damping Ratio 0.2
Delay Distance 0.5 m (1.6 ft) 50% recovery
Threshold
  • 0.8 m s-1 (1.8 mph) with 10° displacement
  • 1.8 m/s (4 mph) with 5° displacement
Transducer
  • Precision conductive plastic potentiometer (10 kohm resistance)
  • 1.0% linearity
  • Life expectancy is 50 million revolutions.
  • Rated 1 W at 40°C, 0 W at 125°C.
Transducer Excitation Requires regulated dc voltage. (15 Vdc maximum)
Transducer Output Analog dc voltage proportional to wind direction angle with regulated excitation voltage supplied by the datalogger
Vane Length 22 cm (8.7 in.)
Weight 170 g (6 oz)

Compatibility

Mounting

The 03002 is supplied with a 12-in.-long x 1-in. IPS unthreaded aluminum pipe, which mounts to a crossarm via a CM220 Mount or 17953 NU-RAIL fitting. The 03002 can also be mounted to the top of a CM106B or stainless-steel tripod via the CM216.

Wind Profile Studies

An ideal application for the Wind Sentry is wind profile studies. For this application, the LLAC4 4-channel Low Level AC Conversion Module can be used to increase the number of anemometers measured by one datalogger. The LLAC4 allows datalogger control ports to read the anemometer’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

Programming

The anemometer 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).

Compatible Contemporary Dataloggers

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


Frequently Asked Questions

Number of FAQs related to 03002-L: 9

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  1. It is possible, but Campbell Scientific does not recommend user replacement. Factory replacement is strongly recommended.

  2. One cup cannot be replaced at a time. The whole cup assembly would need to be replaced. The cup assembly can be replaced by the user.

  3. A CM202, CM204, or CM206 crossarm can be used. Select the appropriate crossarm for the application. To mount the sensor to the crossarm, use a CM220 (Right-Angle Mounting Bracket) or a 17953 (1- x 1-inch NU-RAIL Crossover Fitting). To mount the sensor to the top of a CM110-series tripod, use a CM216 (Apex Sensor Mount for SS Tripod).

  4. The 034B-L uses a switch closure for wind speed measurement, and the 03002-L uses a low-level ac output for wind speed measurement. Both use a pulse channel on the datalogger to measure wind speed.

    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.
  5. 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.
  6. 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. 

  7. Many Campbell Scientific sensors are available with different cable termination options. These options include the following:

    • The –PT (–PT w/Tinned Wires) option is the default option and does not display on the product line as the other options do. The cable terminates in pigtails that connect directly to a datalogger.
    • In the –C (–C w/ET/CS110 Connector) option, the cable terminates in a connector that attaches to a CS110 Electric Field Meter or an ET-series weather station.
    • In the –CWS (–CWS w/CWS900 Connector) option, the cable terminates in a connector that attaches to a CWS900-series interface. Connection to a CWS900-series interface allows the sensor to be used in a wireless sensor network.
    • In the –PW (–PW w/Pre-Wire Connector) option, the cable terminates in a connector that attaches to a prewired enclosure.
    • In the –RQ (–RQ w/RAWS Connector) option, the cable terminates in a connector that attaches to a RAWS-P Permanent Remote Automated Weather Station.

    Note: The availability of cable termination options varies by sensor. For example, sensors may have none, two, or several options to choose from. If a desired option is not listed for a specific sensor, contact Campbell Scientific for assistance.

  8. To incorporate a sensor that is compatible with wireless sensor interfaces into a wireless network, a CWS900-series wireless sensor interface is needed, as well as an A205 CWS-to-PC interface to configure it.