CSAT3A

Name: CSAT3A
Brand: Campbell Scientific
SKU: CSAT3A
Availability: InStock

3-D Sonic Anemometer, Head Only

CSAT3A

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3-D Sonic Anemometer, Head Only

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Model:: CSAT3A
Item Number:: CSAT3A
Lead time:: 21 days

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 (u_x, u_y, u_z) and the speed of sound (c) are measured and output at a maximum rate of 50 Hz. The CSAT3A head is operated by the EC100 electronics, which also control either an EC150 or EC155 gas analyzer.

Measurements can be triggered from two sources:

Data logger’s SDM command
EC100’s internal clock

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

Key Advantages

Precision Measurements
Best instrument for flux and other high-level turbulence research projects

Technical Description

The CSAT3A is an optional component of an EC150 open-path or EC155 closed-path CO₂/H₂O gas analyzer. It attaches to a common mounting bracket and connects to the gas analyzer's EC100 electronics module.

Benefits

New conformal coating helps protect sonic transducers in corrosive environments
Innovative design provides precision turbulence measurements with minimal flow distortion
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’s fine wire thermocouples are an option for fast-response temperature measurements
Field rugged
Innovative signal processing and transducer wicks considerably improve performance of the anemometer during rain events
Sealed sonic transducers and electronics

Specifications

Measurement Path Length: 10.0 cm
(3.94 in.) vertical
Measurement Path Length: 5.8 cm
(2.3 in.) horizontal
Path Angle from Horizontal: 60°
Construction: Sealed sonic transducers and electronics
Anemometer Head Materials: Stainless-steel tubing
Electronics Box Materials: Welded aluminum
Operating Temperature Range: -30° to +50°C
Voltage Supply: 10 to 16 Vdc
Current: 200 mA
(60 Hz measurement rate)
Current: 100 mA
(20 Hz measurement rate)
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.)
Support Arm Diameter: 1.59 cm
(0.63 in.)
Transducer Diameter: 0.64 cm
(0.25 in.)
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: u_x, u_y, u_z, c

(u_x, u_y, u_z are wind components referenced to the anemometer axes; c is speed of sound.)
Speed of Sound: 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, or 50 Hz
Measurement Resolution: Resolution values are for instantaneous measurements made on a constant signal; noise is not affected by sample rate.
Measurement Resolution: 1 mm/s rms
(u_x, u_y)
Measurement Resolution: 0.5 mm/s rms
(u_z)
Measurement Resolution: 15 mm/s (0.025°C) rms
(c)
Offset Error: Offset error and gain error values assume the -30° to +50°C range, wind speeds of < 30 m/s, and wind angles between ±170°.
Offset Error: < ±8.0 cm/s
(u_x, u_y)
Offset Error: < ±4.0 cm/s
(u_z)
Gain Error: Offset error and gain error values assume the -30° to +50°C range, wind speeds of < 30 m/s, and wind angles between ±170°.
Gain Error: < ±2% of reading
(wind vector within ±5° of horizontal)
Gain Error: < ±3% of reading
(wind vector within ±10° of horizontal)
Gain Error: < ±6% of reading
(wind vector within ±20° of horizontal)
Rain: Innovative ultrasonic signal processing and user-installable wicks considerably improve the performance of the anemometer under all rain events.

Digital USB and RS-485 Output Signal

Baud Rate: 230400 bps
(maximum)
Data Type: Comma-delimited ASCII

SDM, USB, & RS-485 Digital Outputs Reporting Range

Full-Scale Wind: ±65.535 m/s autoranging between four ranges
(Least significant bit is 0.25 to 2 mm/s.)
Speed of Sound: 300 to 366 m/s
(-50° to +60°C) Least significant bit is 1 mm/s (0.002°C).