81000 RM Young UVW Sonic Anemometer (3 Axis)
Affordable 3-axis ultrasonic anemometer
weather applications supported water applications supported energy applications supported gas flux and turbulence applications supported infrastructure applications supported soil applications supported

Overview

The YOUNG Model 81000 Ultrasonic Anemometer is a 3-axis, no-moving-parts wind sensor. It is ideal for applications requiring fast response, high resolution and three-dimensional wind measurement. The sensor features durable corrosion-resistant construction with 3 opposing pairs of ultrasonic transducers supported by stainless steel members. Each 81000 is individually wind-tunnel calibrated. Wind and sonic temperature data is available on four voltage output channels. Serial RS-232 and RS-485 outputs are available as well. The sensor installs on standard 1 inch pipe. 

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Detailed Description

The 81000 measures wind velocity based on the transit time of ultrasonic signals sent between the transducers. Depending on its orientation and magnitude, air flow alters the sonic signal transit time. By measuring the transit time in each direction along all three paths, the three dimensional wind velocity and speed of sound may be calculated. From speed of sound, sonic temperature is derived. Speed of sound and sonic temperature are corrected for crosswind effects. Measurement data are available as voltage output signals or serial output using RS-232 or RS-485 connections. Both voltage and serial output may be configured for a variety of output formats. Operating parameters may be edited using ordinary terminal software on a PC. Simple menus make it easy. All parameters are stored in nonvolatile memory. Superior environmental resistance is achieved by using UV stabilized thermoplastic, stainless steel, and anodized aluminum components. Electrical connections are made via an easily accessible junction box. The unit mounts on standard 1 inch pipe.

Specifications

Wind Speed

  • Range: 0 to 40 m/s (0 to 90 mph)
  • Resolution: 0.01 m/s
  • Threshold: 0.01 m/s
  • Accuracy: ±1% rms ±0.05 m/s (0 to 30 m/s) ±3% rms (30 to 40 m/s)

Wind Direction

  • Azimuth Range: 0.0 to 359.9 degrees
  • Elevation Range: ±60.0 degrees
  • Resolution: 0.1 degree
  • Accuracy: ±2° (1 to 30 m/s) ±5° (30 to 40 m/s)

Speed of Sound

  • Range: 300 to 360 m/s
  • Resolution: 0.01 m/s
  • Accuracy: ±0.1% rms ±0.05 m/s (0 to 30 m/s wind)

Sonic Temperature

  • Range: -50 to +50 ºC
  • Resolution: 0.01 ºC
  • Accuracy: ± 2 ºC (0 to 30 m/s wind)

Voltage Output

  • 4 CHANNEL Range: 0 to 5000 mV
  • Resolution: 12 Bit
  • Accuracy: ± 0.1% of full scale

General

  • Air sample column: 10 cm high X 10 cm diameter
  • Air sample path: 15 cm
  • Output rate: 4 to 32 Hz (selectable)
  • Output formats: Serial data (selectable) RS-232 and RS-485
  • Baud Rates: 1200 to 38400
  • Power Supply: 12 to 24 VDC, 110 mA
  • Dimensions: Overall height 56 cm Support arm radius 17 cm
  • Mounting: 34 mm (1.34 in) diameter (standard 1 inch pipe)
  • Weight: Sensor weight 1. 7 kg (3.8 lb)

Compatibility

Mounting

The Ultrasonic Wind Monitor can be attached to a 019WM, 019WMTOW, CM202, CM204, or CM206 crossarm via a L17953 NU-RAIL fitting or CM220 Right Angle Mounting Bracket. Alternatively, the Wind Monitors can be attached to the top of our stainless-steel tripods via the CM216 Sensor Mounting Kit.

Datalogger Considerations

The 81000 data are available as voltage output signals or serial output using RS-232 or RS-485 connections. Both voltage and serial output may be configured for a variety of output formats.

Compatible Contemporary Dataloggers

CR800/CR850 CR1000 CR3000 CR5000 CR7X CR9000X

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000
* * *

* Datalogger may require the use of a VDIV2.1