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034B-L Met One Wind Set
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Overview

The 034B, manufactured by Met One, combines a 3-cup anemometer and vane into a single integrated package to measure wind speed and direction. It is cabled for use with our dataloggers, and can provide measurements for a variety of applications.

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Benefits and Features

  • Designed for continuous, long-term, unattended operation in adverse conditions
  • Constructed of lightweight aluminum

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Technical Description

The 034B monitors wind speed using a three-cup anemometer that contains a sealed magnetic reed switch. Rotation of the cup wheel produces a pulse that is directly proportional to wind speed. The frequency of the pulse is measured by the datalogger pulse count channel, then converted to engineering units (mph, m/s, knots).

Wind direction is sensed with 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 of the wind direction.

Specifications

Applications General (Rain with light snow. Little or now riming or blowing sand. No salt spray.)
Sensor 3-cup anemometer and vane
Measurement Description Wind speed and direction
Operating Temperature Range -30° to +70°C
Weight 907 g (2.0 lb)

Wind Speed (Anemometer)
Range 0 to 75 m/s (0 to 167 mph)
Starting Threshold 0.4 m/s (0.9 mph)
Sensor Output Pulsed contact closure
Accuracy
  • 0.1 m/s (0.25 mph) at < 10.14 m/s (22.7 mph)
  • ±1.1% of true at > 10.14 m/s (22.7 mph)
Resolution (0.7998 m s–1) / (scan rate in seconds) or (1.789 mph) / (scan rate in seconds)
Anemometer Radius 10.7 cm (4.2 in.)
Anemometer Height 24.4 cm (9.6 in.)
Output Signal Contact closure (reed switch)

Wind Direction (Vane)
Mechanical Range 360°
Electrical Range 356° (4° open)
Accuracy ±4°
Damping Ratio 0.25
Resolution < 0.5°
Potentiometer Resistance 0 to 10 kΩ (open at crossover)
Threshold 0.4 m s–1 (0.9 mph)
Vane Length 33.5 cm (13.2 in.)

Compatibility

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Dataloggers

Product Compatible Note
CR1000 (retired)
CR1000X
CR300
CR3000 (retired)
CR310
CR350
CR6
CR800 (retired)
CR800 (retired)
CR800 (retired)
CR850 (retired)
CR850 (retired)
CR850 (retired)
CR850 (retired)

Additional Compatibility Information

Mounting

The 034B can be attached to a Campbell Scientific crossarm using a 17953 Nu-Rail fitting or a CM220 Right Angle Mounting Bracket. Alternatively, the 034B can be attached to the top of our stainless-steel tripods via the CM216 Sensor Mounting Kit. The CM216 extends 4 inches above the mast of a CM106B, CM110, CM115, or CM120 tripod.

Data Logger Considerations

The 034B's anemometer 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 034B's 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).

Related Documents

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Related FAQs

Number of FAQs related to 034B-L: 13

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  1. What type of pole and mounting bracket should be used to mount a 034B-L against an outside wall of a building, sticking up over the roofline?

    For proper siting of the wind sensor, refer to the 034B-L manual. The 034B-L can be mounted using a 1.00 IPS pipe of any length.

  2. Can the 034B-L store data?

    No. A datalogger is needed to measure and store data from the 034B-L.

  3. What should be done if the rods of the 034B-L wind sensor are bent?

    Wind vane tails are user-replaceable and are available for purchase as pn 13765, Replacement Wind Vane Tail for 034B or 034A.

  4. What are the suggested supply voltages for both the vane and anemometer of a 034B-L?

    The supply voltage is 5 Vdc.

  5. What is the major difference between the 034B-L and the 03002-L?

    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.

  6. Do the vane and anemometer of the 034B-L produce analog or digital signals?

    Analog.

  7. What is the power consumption of the 034B-L anemometer?

    The sensor does not consume power to operate.

  8. What needs to be done to replace an existing 034A-L at a weather station with a new 034B-L?

    They are completely interchangeable, and no changes are needed.

  9. 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 datalogger. For other sensors, the calibration sheet is a pass/fail report.

  10. If the original calibration sheet gets lost, can another copy be requested?

    This depends on the information contained in the calibration sheet:

    • If the calibration sheet contains coefficient information, Campbell Scientific keeps a copy, and a replacement copy can be requested.
    • If the calibration sheet does not contain coefficients, Campbell Scientific does not keep a copy. It may be possible to contact the original manufacturer for a replacement copy.
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