034B-L Wind Set
Reliable, Accurate Wind Measurements
Compatible with most Campbell Scientific dataloggers
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications


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

  • Compatible with all contemporary dataloggers (including the CR200X series)
  • Designed for continuous, long term, unattended operation in adverse conditions
  • Constructed of light-weight aluminum
  • 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.


Detailed 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.


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)
Accuracy < 10.14 m/s (22.7 mph) 0.1 m/s (0.25 mph)
Accuracy > 10.14 m/s (22.7 mph) ±1.1% of true
Resolution (1.789 mph) / (scan rate in seconds) or (0.7998 m s–1) / (scan rate in seconds)
Starting Threshold 0.4 m/s (0.9 mph)
Sensor Output Pulsed contact closure
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 < 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.)



The 034B can be attached to a crossarm via a 17953 NU-RAIL fitting or a CM220 Right Angle Mounting Bracket. Alternatively, the 034B can be attached to the top of a CM106B or stainless-steel tripod via the CM216 Sensor Mounting Kit. The CM216 extends 4 in. above the mast of the tripod.

Datalogger Considerations

The 034B's anemometer 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).


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).

Compatible Contemporary Dataloggers

CR1000 CR3000 CR6 CR9000X CR300

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000
* *

*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 034B-L: 15

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

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

  3. 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.

  4. They are completely interchangeable, and no changes are needed.

  5. The sensor does not consume power to operate.

  6. 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.

  7. 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.

  8. 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. 

Case Studies

Bucknell University: Weather Station
The Geography Department at Bucknell University has implemented a weather station to obtain meteorological data......read more