CSAT3B

Name: CSAT3B
Brand: Campbell Scientific
SKU: CSAT3B
Availability: InStock

3-D Sonic Anemometer with Integrated Electronics

CSAT3B

Limited availability

3-D Sonic Anemometer with Integrated Electronics

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Configuration

Sonic Carrying CaseCSAT3B-SCPart Number: 42079
No Carrying CaseCSAT3B-NCPart Number: 42078

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Model:: CSAT3B
Item Number:: CSAT3B
Warranty:: 1 year

Overview

Campbell Scientific’s CSAT3B 3-D Sonic Anemometer is an update and replacement to the original CSAT3, and remains 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 sonic temperature (T_s) are measured and output at a maximum rate of 100 Hz.

The most conspicuous innovation of the new design is the elimination of the electronics box. Instead, the electronics are packaged inside the mounting block of the CSAT3B head. This design feature makes installation easier and offers greater flexibility in instrument placement.

Measurements can be triggered from three sources:

Data logger SDM command
Data logger CPI command
CSAT3B internal clock

The SDM and CPI protocols both support mechanisms for synchronizing multiple CSAT3Bs.

Key Advantages

Precision Measurements
Designed for flux and other turbulence research projects

Benefits

New conformal coating helps protect sonic transducers in corrosive environments
Integrated electronics that provide easy mounting of a single piece of hardware
Integrated inclinometer
High-precision measurements ideal for turbulence and eddy-covariance studies
An improved design with a thin, aerodynamic support strut close to the ends of the sensor arms, creating greater rigidity and improved accuracy of sonic temperature
Data logger sampling supported for any frequency between 1 and 100 Hz
New CPI communications for more robust, higher bandwidth measurements
Multiple communication options including SDM, CPI, USB, and RS-485
Internal temperature and humidity measurements with easily replaced desiccant
Version 5 algorithm for calculating data outputs; combines the signal sensitivity of version 3 with the rain performance of version 4
Includes options to filter high frequencies for applications requiring analysis of non-aliased spectra

Specifications

Sensor: 3-dimensional sonic anemometer
Measurement Description: Highest-quality wind speed and direction
Operating Temperature Range: -40 to +50°C
(equivalent to 305 to 368 m s^-1 in speed of sound)
Outputs: u_x, u_y, u_z, T_s
(u_x, u_y, u_z are wind components referenced to the anemometer axes; T_s is sonic temperature in degrees Celsius.)
Signal Type/Output: SDM, CPI, USB, RS-485
Speed of Sound: Determined from three acoustic paths.
(Corrected for crosswind effects.)
Wind Direction Range: 2.5 to 357.5° in CSAT3B coordinate system
(0 to 360° customized)
Range: ± 65 m s^–1
(full-scale wind)
Filter Bandwidths: 5, 10, or 25 Hz
Measurement Path Length: 10.0 cm (3.9 in.) vertical; 5.8 cm (2.3 in.) horizontal
Transducer Angle from Horizontal: 60 degrees
Ingress Protection: IP67
Transducer Diameter: 0.64 cm
(0.25 in.)
Transducer Mounting Arm Diameter: 0.84 cm
(0.33 in.)
Support Arm Diameter: 1.59 cm
(0.63 in.)
Anemometer Head Weight: 1.45 kg
(3.2 lb)
Anemometer Dimensions: 60.64 x 12.2 x 43.0 cm
(23.87 x 4.8 x 16.9 in.)

Wind Accuracy

-NOTE-: Accuracy specifications assume the following:
-40° to +50°C operating rangeWind speeds < 30 m s^-1Wind angles between ±170°
Maximum Offset Error: < ±8.0 cm s^-1 (u_x, u_y), < ±4.0 cm s^-1 (u_z)
Maximum Gain Error: < ±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)

Measurement Resolution

u_x, u_y: 1 mm s^-1 rms
u_z: 0.5 mm s^-1 rms
T_s: 0.002°C RMS
(at 25°C)
Wind Direction: < 0.058°
(u_x = u_y ≤ 1 m s^-1)

Measurement Rates

Data Logger Triggered: 1 to 100 Hz
Unprompted Output (to PC): 10, 20, 50, or 100 Hz
Internal Self-Trigger Rate: 100 Hz

Measurement Delay

Data Logger Triggered (no filter): 1 trigger period
(1 scan interval)
Unprompted Output (no filter): 10 ms
Filtered Output (data-logger-prompted or unprompted to PC): 795 ms
(with 5 Hz bandwidth filter)
395 ms
(with 10 Hz bandwidth filter)
155 ms
(with 25 Hz bandwidth filter)

Internal Monitor Measurements

Update Rate: 2 Hz
Inclinometer Accuracy: ±1°
Relative Humidity Accuracy: ±3%
(over 10 to 90% range)
±7%
(over 0 to 10% range)
±7%
(over 90 to 100 % range)
Board Temperature Accuracy: ±2°C

SDM

-NOTE-: Used for data-logger-based data acquisition.
Bit Period: 10 µs to 1 ms
Cable Length: 7.6 m (25 ft) max
(@ 10 µs bit period)
76 m (250 ft) max
(@ 1 ms bit period)
Address Range: 1 to 14
Bus Clocks per Sample: ~200

CPI

-NOTE-: Used for data-logger-based data acquisition.
Baud Rate: 50 kbps to 1 Mbps
Cable Length: 15 m (50 ft) max
(@ 1 Mbps)
122 m (400 ft) max
(@ 250 kbps)
853 m (2800 ft) max
(@ 50 kbps)
Address Range: 1 to 120
Bus Clocks per Sample: ~300

RS-485

-NOTE-: Used for configuration or PC-based data acquisition.
Baud Rate: 9.6 kbps to 115.2 kbps
Cable Length: 305 m (1000 ft) max
(@ 115.2 kbps)
610 m (2000 ft) max
(@ 9.6 kbps)
Bus Clocks per Sample: ~500
(ASCII formatted)

USB

-NOTE-: Used for configuration or PC-based data acquisition.
Connection Speed: USB 2.0 full speed 12 Mbps
Cable Length: 5 m (16.4 ft) maximum

Power Requirements

Voltage Supply: 9.5 to 32 Vdc
Current at 10 Hz Measurement Rate: 110 mA
(@ 12 Vdc)
65 mA
(@ 24 Vdc)
Current at 100 Hz Measurement Rate: 145 mA
(@ 12 Vdc)
80 mA
(@ 24 Vdc)