CSAT3A3-D Sonic Anemomer，仅限头
Precision Measurements
助焊剂和其他高级湍流研究项目的最佳仪器
天气应用程序 水应用 能源应用 gas flux and turbulence applications infrastructure applications soil applications

Overview

The CSAT3A 3-D Sonic Anemometer is the 3-D sonic anemometer of choice for eddy-covariance measurements. It has an aerodynamic design, a 10 cm vertical measurement path, operates in a pulsed acoustic mode, and withstands exposure to harsh weather conditions. Three orthogonal wind components (ux，U.y，U.z），声音（c）的速度以50Hz的最大速率测量和输出。CSAT3A头由EC100电子设备运营，也控制EC150或EC155气体分析仪。

测量可以从两个来源触发：

  • Data logger’s SDM command
  • EC100’s internal clock

The SDM protocol supports a group trigger for synchronizing multiple CSAT3As.

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福利和特色

  • New conformal coating helps protect sonic transducers in corrosive environments
  • 创新设计提供了具有最小流动变形的精密湍流测量
  • Usually combined with EC150 or EC155 gas analyzers giving near complete colocation for eddy-covariance measurements
  • Compatible with most Campbell Scientific data loggers
  • Measurements can be used to calculate momentum flux and friction velocity
  • Campbell Scientific的细线热电偶是快速响应温度测量的选项
  • Field rugged
  • 创新的信号处理和换能器灯管在雨雨期间显着提高了风速计的性能
  • 密封声音换能器和电子产品

Images

CSAT3Alower transducer assembly top view

详细说明

The CSAT3A is an optional component of an EC150 open-path or EC155 closed-path CO2/H2o气体分析仪。它连接到共同的安装支架上，并连接到气体分析仪的EC100电子模块。

Specifications

测量路径长度
  • 10.0 cm (3.94 in.) vertical
  • 5.8 cm (2.3 in.) horizontal
水平的路径角 60°
Construction 密封声音换能器和电子产品
Anemometer Head Materials Stainless-steel tubing
Electronics Box Materials 焊接铝
Operating Temperature Range -30° to +50°C
Voltage Supply 10到16 VDC
当前的
  • 200 mA（60 Hz测量率）
  • 100 mA（20 Hz测量率）
Digital SDM Output Signal CSI 33.3 k baud serial interface for data logger/sensor communication. (Data type is 2-byte integer per output plus 2-byte diagnostic.)
支持Arm Diameter 1.59 cm (0.63 in.)
换能器直径 0.64厘米（0.25英寸）
Transducer Mounting Arm Diameter 0.84 cm (0.33 in.)
Anemometer Head Dimensions 47.3 x 42.4 cm (18.6 x 16.7 in.)
Anemometer Head Weight 1.7 kg (3.7 lb)

Measurements
Outputs ux，U.y，U.z， C
（U.x，U.y，U.zare wind components referenced to the anemometer axes; c is speed of sound.)
声音的速度 Determined from three acoustic paths; corrected for crosswind effects.
Measurement Rate Programmable from 1 to 60 Hz, instantaneous measurements. Two over-sampled modes are block averaged to either 20 Hz or 10 Hz.
Output Bandwidths 5, 10, 12.5, or 20 Hz
Output Rate 10,20,25或50 Hz
Measurement Resolution
  • Resolution values are for instantaneous measurements made on a constant signal; noise is not affected by sample rate.
  • 1 mm / s rms（U.x，U.y)
  • 0.5 mm / s rms（U.z)
  • 15 mm / s（0.025°C）rms（c）
偏移错误
  • 偏移误差和增益误差值假设-30°至+ 50°C范围，风速<30米/秒，风角在±170°之间。
  • < ±8.0 cm/s (ux，U.y)
  • <±4.0 cm / s（Uz)
获得错误
  • 偏移误差和增益误差值假设-30°至+ 50°C范围，风速<30米/秒，风角在±170°之间。
  • < ±2% of reading (wind vector within ±5° of horizontal)
  • < ±3% of reading (wind vector within ±10° of horizontal)
  • < ±6% of reading (wind vector within ±20° of horizontal)
雨 创新的超声波信号处理和用户可安装的芯片在所有雨季事件下大大提高了风速计的性能。

数字USB和RS-485输出信号
波特率 230400 bps (maximum)
数据类型 Comma-delimited ASCII

SDM，USB和RS-485数字输出报告范围
Full-Scale Wind ±65.535 m/s autoranging between four ranges (Least significant bit is 0.25 to 2 mm/s.)
声音的速度 300 to 366 m/s (-50° to +60°C) Least significant bit is 1 mm/s (0.002°C).

Compatibility

Note:以下显示了显着的兼容性信息。它不是所有兼容或不兼容产品的全面列表。

Data Loggers

Product Compatible Note
CR1000.(retired)
CR200x.(retired)
CR206X(retired)
CR211x.(retired)
CR216X(retired)
CR295X(retired)
CR3000
CR5000(retired)
CR800
CR850
CR9000X(retired)

常见问题

Number of FAQs related toCSAT3A:22

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  1. CSAT3A，CSAT3AH，CSAT3B或CSAT3BH是否有任何安装选项，以频繁重新定位？

    Campbell Scientific不提供任何安装臂或硬件，可轻松频繁地定位Sonic Anemometer传感器头。这种类型的硬件必须由用户提供。

  2. 单个CSAT3A，CSAT3AH，CSAT3B或CSAT3BH的偏移是相对常数的偏移量是相对常数的？

    不可以。偏移是温度和时间的函数。每年一次，点击SONC ANEMOMETERS WINDS偏移使用中概述的程序CSAT3B instruction manual. If the measured offset is outside the specification, return the sensor to the factory for calibration. To request a return material authorization (RMA) number,follow the steps listed on ourRepair and Calibration页。

  3. 可以更换CSAT3 / 3A / 3H上的气泡水平吗？

    是的。泡沫水平可以在现场中更换pn 31962,1-Ring Replacement Bubble Level with Mounting Bumper and Hardware.

  4. If the temperature drops below -30°C, is that a problem for a CSAT3A or CSAT3B?

    将CSAT3A或CSAT3B校准在-30°至+ 50°C的温度范围内。机速计工作温度范围可以偏移10度以覆盖-40°至+ 40°C的范围。对于低温应用，考虑我们的声音风速计的加热版本可能更为合适。

    仪器将继续在校准温度范围之外运行，直到信号变得太弱;但是，由于校准文件仅跨越指定的温度范围，因此不适用于测量的正确校准。

  5. What are the calibration procedures for the CSAT3A, CSAT3AH, CSAT3B, and CSAT3BH, and how are they traceable to NIST?

    The CSAT3A, CSAT3AH, CSAT3B, and CSAT3BH are calibrated over temperature for the effects of transducer delays on the wind speed, and to a lesser extent, for the speed of sound measurements.

    对超声波风管没有NIST可追踪标准。

  6. Is there a way to determine the time at which the CSAT3A, CSAT3AH, CSAT3B, or CSAT3BH started reporting data with sub-second precision?

    不。声波式风速计不报告时间the wind measurements. A time stamp will be assigned to the wind data by the data-acquisition system—either a data logger or a PC.

  7. What is the natural frequency of the CSAT3A, CSAT3AH, CSAT3B, or CSAT3BH?

    100 Hz.

  8. Can the CSAT3A, CSAT3AH, CSAT3B, or CSAT3BH be used in low-speed conditions, such as less than 5 cm/s? If so, what are the resolution and accuracy at these low speeds?

    The sonic anemometer offset specification is ±8 cm/s. Therefore, it cannot be used in an application where the expected wind speed is in the range of ±5 cm/s.

  9. 如果CSAT3A，CSAT3AH，CSAT3B或CSAT3BH换能器的末端的聚合物涂层开始发生，则是一个问题吗？

    是的。如果匹配层损坏或丢失，请将声音风速计返回工厂以进行维修。按照我们列出的步骤Repair and Calibration页面要求返回材料授权（RMA）编号。

  10. Can a CSAT3A, CSAT3AH, CSAT3B, or CSAT3BH be used to measure wind flow angle, horizontal angle, and wind speed for the purpose of power curve testing?

    声波风速计测量右手笛卡尔坐标系中的三维风。从这些测量中，使用三角形来计算风速角度，水平角度和风速。

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