CSAT3A
CSAT3A
Orderable3-D Sonic Anemometer, Head Only
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, 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.
Key Advantages
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
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).
Replacement Parts
(3)44299
Replacement Sonic Head for CSAT3A
The 44299 CSAT3A sonic anemometer head is similar to the sensor head from the CSAT3 sonic anemometer, but its cable is modified to connect to the EC100 electronics. It is used as part of the EC150 open-path analyzer and the CPEC3XX closed-path eddy-covariance system.
Orderable31461
CSAT3A Replacement Carrying Case with Foam Insert
The 31461 is a large, rugged carrying case with foam to accommodate a CSAT3A sonic anemometer and its accessories.
Orderable33434
CSAT3A Replacement Carrying Case without Foam
The 33434 is a large, rugged carrying case without foam to accommodate a CSAT3A sonic anemometer and its accessories. This product is intended for use with foam inserts that were originally shipped with the CSAT3A.
Orderable
Services
(3)16554
CSAT3A/B/BH/C Standard Calibration without CMM or Data
The 16554 provides calibration over the CSAT3A's operating temperature range without using the coordinate measurement machine (CMM); the CMM is used on the CSAT3A at time of original purchase. During calibration, Campbell Scientific determines if the geometry of the heads has changed since original manufacture. If so, the 16555 Calibration with a CMM is required. In all cases, factory calibration requires an RMA (Return Material Authorization).
Orderable16555
CSAT3A/B/BH/C Calibration with CMM but without Data
The 16555 includes calibration over the CSAT3A's operating temperature range and coordinate measurement of transducer positions in space relative to the bubble mounting surface. A coordinate measurement machine (CMM) is used for this process. CMM measurement is performed on the CSAT3A at time of original purchase. This calibration option (instead of the 16554) is required if the geometry of the heads has changed since original manufacture. In all cases, factory calibration requires an RMA (Return Material Authorization).
Orderable38945
Sonic Anemometer Inspection, Diagnosis, and Evaluation
The 38945 service is for Campbell Scientific sonic anemometers (CSAT3, CSAT3A, CSAT3B, and CSAT3BH) that are sent in for repair service, but, after diagnosis, it is determined that the sensor cannot be repaired or calibrated, or repair is not required. This service fee covers the required sensor testing for the evaluation.
Orderable
Ships With
(1)
Similar Products
(10)CSAT3B
3-D Sonic Anemometer with Integrated Electronics
Limited availability27106T
Vertical Propeller Anemometer
Orderable03101
Wind Sentry Anemometer
Limited availability03301
Wind Sentry Vane
Limited availability03002
Wind Sentry Set
Orderable05103
Wind Monitor
Orderable05305
RM Young Wind Monitor AQ
OrderableWINDSONIC1
2-D Sonic Wind Sensor with RS-232 Output
OrderableWINDSONIC4
2-D Sonic Wind Sensor with SDI-12 Output
OrderableCSAT3C
3-D Sonic Anemometer for Demanding Flux Research
Orderable
Related Resources
Case Studies
Korea: Flux Monitoring over a Rice Paddy
Eddy covariance fluxes and vertical profiles of methane, carbon dioxide, and water vapor
Seoul, Korea
January 25, 2013
View
Alaska: Eddy Covariance
Measuring eddy-covariance fluxes in cold-climate forest
Bonanza Creek Experimental Forest (a National Science Foundation Long-Term Ecological Research site in the Alaska interior)
June 19, 2013
View
British Columbia: Forest Carbon Sequestration
Long-term eddy-covariance assessment of carbon sequestration in forested land
Vancouver Island, British Columbia, Canada
April 17, 2013
View
Documents
- Manual
EC155 CO2 and H2O Closed-Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer
September 2021
View Document - Compliance
CSAT3A EU Declaration of Conformity
View Document - Brochure
CSAT3A 3D Sonic Anemometer
March 2026
View Document - Manual
Open Path Eddy Covariance System with IRGASON or EC150/CSAT3A Quick Deploy Guide
January 2024
View Document
Showing 4 of 9 results
See all Documents