03101-L Wind Sentry Anemometer
Reliable, Accurate Wind Speed
Compatible with all Campbell Scientific dataloggers
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The 03101 is the three-cup anemometer included with our Wind Sentry Sets. It can be purchased separately for applications that require only wind speed measurements. The 03101 connects directly to a Campbell Scientific datalogger, which measures the anemometer's pulse signal and converts the signal to engineering units (mph, m/s, knots).

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Benefits and Features

  • Ideal for applications that do not require wind direction measurements
  • Compatible with most Campbell Scientific data loggers
  • Designed for continuous, long-term, unattended operation in adverse conditions
  • Small size, simplicity, and rugged construction provide a quality instrument for a modest price
  • Ideal for wind profile studies
  • Compatible with the LLAC4 4-channel Low-Level AC-Conversion Module, which increases the number of anemometers one data logger can measure
  • Campbell Scientific version uses shielded bearings, which lowers the anemometer's starting threshold


03101 with IPS pipe; crossarm and Nu-Rail fitting sold separately
03101 with IPS pipe; crossarm and Nu-Rail fitting sold separately
03101 with IPS pipe; crossarm and Nu-Rail fitting sold separately
03101 with IPS pipe; crossarm and Nu-Rail fitting sold separately

Detailed Description

The 03101 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. Campbell Scientific’s version uses shielded bearings, which lowers the anemometer’s threshold.


Sensor 3-cup anemometer
Measurement Description Wind speed
Range 0 to 50 m/s (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
Starting Threshold 0.5 m/s (1.1 mph)
Transducer Stationary coil (1300 ohm nominal resistance)
Output Frequency 1 cycle per cup wheel revolution (0.75 m/s per Hz)
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)
Operating Temperature Range -50° to +50°C (assumes non-riming conditions)
Cup Wheel Diameter 12 cm (4.7 in.)
Height 23.4 cm (9.2 in.)
Weight 113 g (4 oz)


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


Product Compatible Note
21X (retired)
CR10 (retired)
CR1000 (retired)
CR1000 (retired)
CR1000 (retired)
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR3000 (retired)
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR9000 (retired)
CR9000X (retired)

Additional Compatibility Information


The 03101 anemometer is supplied with a galvanized 10-in.-long x ¾-in. IPS threaded pipe, which mounts to a crossarm via a CM220 mount or 1049 Nu-Rail fitting. The 03101 can also be mounted to the top of a CM106B or a 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 data logger. The LLAC4 allows data logger control ports to read the anemometer’s ac signals instead of using pulse channels. Data loggers compatible with the LLAC4 are the CR200(X)-series (ac signal ≤1 kHz only), CR800, CR850, CR1000, CR3000, and CR5000.

Data Logger Considerations

The 03101 uses one pulse count channel on the data logger.


The 03101 is read by the PulseCount Instruction in CRBasic and by Instruction 3 (Pulse Count) in Edlog. Wind speed measurements can be taken and processed with any of the data loggers.

Frequently Asked Questions

Number of FAQs related to 03101-L: 3

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  1. The sensor could be sent in for repair if it isn't a total loss. Remember to call for an RMA (return material authorization) number before sending in the sensor.

    • Replacing the wind speed sensor:
      • Purchase a 03101-L to replace the anemometer. This unit comes with a pipe mount adapter that can be removed and used with the 40-cm Wind Sentry crossarm. Remember to purchase the correct cable length to match the damaged sensor.
    • Replacing the wind direction sensor
      • Additional options come with this sensor. Don't forget the cable length!
      • Purchase a 03301-L-NM for just the wind-direction sensor and cable.
      • Purchase a 03301-L-SM to add a wind-direction sensor to an existing 03101-L anemometer and the 40-cm Wind Sentry crossarm.
      • Purchase a 03301-L-P for a wind-direction sensor with a pipe-mount adapter.
  2. No. But using a LLAC4 will convert the ac signal for up to four 03101-L sensors (and other ac output anemometers) to individual 0 to 5 Vdc TTL level square wave outputs. For more information, see the LLAC4 specification information

  3. 03101-L Specifications
    Gust survival: 134 mph (60 m/s)
    Accuracy: ±1.1 mph (0.5 m/s)
    Threshold (w/ shielded bearings): 1.1 mph (0.5 m/s)
    Distance constant: 7.5 ft (63% recovery)

    014A-L Specifications
    Operating range: 0 to 100 mph (0 to 45 m/s)
    Accuracy: ±0.25 mph (0.11 m/s) or ±1.5%
    Threshold: 1 mph (0.45 m/s)
    Distance constant (aluminum cups): 15 ft (4.6 m)
    Distance constant (optional fast response Lexan cups): < 5 ft (1.5 m)

    Any mechanical wind speed sensor will need to have its bearings replaced on a regular basis. The 03101-L is a less expensive sensor and does not have a reed switch to replace. It’s easier to work on, and the bearings are less expensive. The turret covering the bearings is longer and protects the bearings better from dust and debris. The cups and sensor body are plastic and more fragile, so careful handling is required, but they hold up well after the sensor is installed.

    The 03101-L comes with a ¾ in. pipe. The 014A-L has a 1 in. pipe.