CSAT3A 3-D Sonic Anemometer

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

9 ₫

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, uy, uz) 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.

Category: Uncategorized

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 and Features

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

Measurement Path Length	10.0 cm (3.94 in.) vertical 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) 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	ux, uy, uz, c (ux, uy, uz 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. 1 mm/s rms (ux, uy) 0.5 mm/s rms (uz) 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°. < ±8.0 cm/s (ux, uy) < ±4.0 cm/s (uz)
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°. < ±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)
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).

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Benefits and Features