CSAT3 CAMPBELL | Alldatasheet
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5] SCIENTIFIC \\_/ WHEN MEASUREMENTS MATTER Overview The CSAT3 is a three-dimensional sonic anemometer that measures three orthogonal wind components and the speed of sound. In eddy covariance systems, it can measure the turbulent fluctuations of horizontal and vertical wind. Benefits and Features ) Provides precision turbulence measurements with minimal flow distortion ) FWOS fine wire thermocouple (12.7 pm diameter) is available as an option for fast response temperature measurements Technical Description The CSAT3 has a 10 cm vertical measurement path and operates in a pulsed acoustic mode. The three orthogonal wind components (Uy, Uy, ) and the speed of sound (c) are measured and output at a maximum rate of 60 Hz. Analog outputs and two types of digital outputs are provided. Specifications Measurement Path Length ) 10.0 cm (3.94 in) vertical 5.8cm (2.28in.) horizontal Path Angle from Horizontal 60° NEE(ERES CSAT3 3-D Sonic Anemometer Precision Measurements Best instrument for flux and other high-level turbulence research projects These measurements are then used to calculate momentum flux and friction velocity. This sonic anemometer can also provide average horizontal wind speed and direction measurements. The CSAT3 comes with 25 ft cables. ) Withstands exposure to harsh weather conditions ) Measurements can be used to calculate momentum flux and friction velocity ) Compatible with most Campbell Scientific data loggers Measurements can be triggered from from the CSAT3's internal clock, the PC-generated RS-232 command, or the datalogger’s SDM command. The SDM protocol supports a group trigger for synchronizing multiple CSAT3s. The FWO5 fine wire thermocouple (12.7 um diameter) is available as an option for fast response temperature measurements. Sealed sonic transducers and electronics Construction Anemometer Head Materials Stainless-steel tubing For comprehensive details, visit: www.campbellsci.eu/csat3 ‘
Electronics Box Dimensions Electronics Box Weight Measurements Outputs Speed of Sound Measurement Rate Measurement Resolution Offset Error SCIENTIFIC Cast aluminum -30°to +50°C 10to 16 Vdc 200 mA (60 Hz measurement rate) 100 mA (20 Hz measurement rate) (51333 k baud serial interface for data logger/sensor communication. (Data type is 2- byte integer per output plus 2- byte diagnostic.) 1.59¢cm (0.63in) 064cm (0.25in) 084cm (0.33in) 762m (25ft) 473x424cm (186x 167 1n) 17kg (371b) 26x16x9cm (10.24x 6.3 x3.54 in) 38kg (84 1b) Uy, Uy, Uz, C (uy, Uy, U are wind components referenced to the anemometer axes; cis speed of sound) Determined from three acoustic paths; corrected for crosswind effects. Programmable from 1to 60 Hz, instantaneous measurements. Two over-sampled modes are block averaged to either 20 Hz or10Hz. 0.06° rms (wind direction) 15 mm/s (0.025°C) rms (c) 0.5 mm/s rms (u,) Resolution values are for instantaneous measurements made on a constant signal; noise is not affected by sample rate. 1 mm/s rms (uy, uy) < £80 cm/s (uy, uy) Offset error and gain error values assume the -30°to +50°C range, wind speeds of < 30 m/s, and wind angles between £170°. < +4.0 cm/s (up) Gain Error < +2% of reading (wind vector within +5° of horizontal) < +6% of reading (wind vector within +20° of horizontal) < £3% of reading (wind vector within +10° of horizontal) Offset error and gain error values assume the -30° to +50°C range, wind speeds of < 30 m/s, and wind angles between +£170°. Wind Direction Accuracy ~ +0.7°at 1 m/s (for horizontal wind) Rain Innovative ultrasonic signal processing and user-installable wicks considerably improve the performance of the anemometer under all rain events. Digital RS-232 Output Signal Baud Rate 9600, 19200 bps Data Type 2-byte integer per output plus 2-byte diagnostic Analog Number of Outputs 4 Voltage Range +5V Number of Bits 12 SDM & RS-232 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 300to 366 m/s (-50° to +60°C) Least significant bit is 1 mm/s (0.002°0). Analog Outputs Reporting Range Uy £30ms’, +60ms’ Uy +30ms’, 60 ms’ u, +8ms’ c 300t0366m s (-50 to +60°C) Analog Outputs LSB Uy 15mms’, 30mms’ Uy 15mms’, 30mms’ u, I c 16mm s’ (0.026°C) For comprehensive details, visit: www.campbellsci.eu/csat3 CAMPBELL 80 Hathern Road, Shepshed, LE129GX UK | +(0)1509828888 | sale@campbellsci.couk | www.campbellscieu AUSTRALIA | BRAZIL | CANADA | CHINA | COSTA RICA | FRANCE | GERMANY | INDIA | SOUTH AFRICA | SPAIN | THAILAND | UK | USA ©2019 Campbell Scientific, Ltd.| 12/12/2019