03101-L Wind Sentry Anemometer
Reliable, Accurate Wind Speed
Compatible with most Campbell Scientific data loggers
weather applications water applications energy applications gas flux and turbulence applications infrastructure applications soil applications

Overview

The 03101 is the three-cup anemometer included with our Wind Sentry Sets. You can purchase it separately if your application requires only wind speed measurements. The 03101 connects directly to a Campbell Scientific data logger, 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

The "-L" on a product model indicates that the cable length is specified at the time of order.

Images

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. The frequency of the ac signal is measured by a data logger 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.

Specifications

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)

Compatibility

Mounting

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.

Programming

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: 6

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  1. What might cause a 03101-L to produce a signal that is not high enough to be registered by the magnetic pickup?

    Very low voltage outputs from the sensor could be the result of a bad coil or an internal magnet that was mounted incorrectly. Refer to the “Troubleshooting” section of the instruction manual for more information. If it is necessary to return the sensor to Campbell Scientific for repair, request a return material authorization (RMA) number by following the steps listed on our Repair and Calibration page.

  2. How is the 03101-L, with its offset fitting and strain relief, mounted to the conversion kit?

    Follow these steps:

    1. Remove the screw that attaches the 03101-L to the pipe mount fitting.
    2. Set the screw aside, but do not discard it.
    3. Mount the plastic flange of the 03101-L sensor to the underside of the crossarm.
    4. Use the screw to secure the sensor to the crossarm.
  3. If a cup breaks off the 03101-L, can the cup be replaced, or is a new sensor needed?

    The cup assembly can be replaced with pn 4609, Replacement Wind Speed Cup Assembly for 03001 or 03101. 

  4. Is the 03101-L capable of delivering a 0 to 5 Vdc square wave output for the wind speed?

    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. 

  5. How can the pulse output of a 03101-L be converted to a 4 to 20 mA output?

    The pulse output can’t be converted easily to a 4 to 20 mA output without additional equipment. For a wind monitor designed to generate a 4 to 20 mA output, refer to the R. M. Young website. 

  6. Can the 03101-L be installed in a position that is tilted to the horizontal?

    No. Installing the anemometer in a tilted position will cause damage to the bearings and the shaft, and the bearings will be infiltrated with water and dust.

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