für Fluxmessungen und Strömungsforschungen
Überblick
Das CSAT3B Ultraschall-Anemometer ist eine überarbeitete Version des CSAT3 und das 3D-Anemometer für Eddy-Kovarianzmessungen. Es hat das bewährte aerodynamische Design mit dem 10 cm -Messvolumen und ist robust genug für rauhere Umgebungen.
Die drei orthogonalen Windgeschwindigkeiten (ux, uy, uz) und die Ultraschall-Temperatur (Ts) können mit bis zu 100 Hz gemessen und ausgegeben werden.
Hauptsächliche Änderung ist der Wegfall der Box mit der Elektronik. Die Elektronik ist jetzt im Messkopf untergebracht, dadurch ist die Installation einfacher und man kann das Instrument flexibler einsetzen.
Messungen können ausgelöst werden durch
- SDM-Befehl vom Logger
- CPI Befehl vom Logger
- Interne Uhr des CSAT3B
Das SDM und das CPI Protokoll unterstützen die Verwendung und Synchronisierung mehrerer CSAT3Bs an einem Datenlogger.
Funktionen und Vorteile
- 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
Bilder
Spezifikationen
| 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 | ux, uy, uz, Ts (ux, uy, uz are wind components referenced to the anemometer axes; Ts 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 |
| 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:
|
| Maximum Offset Error | < ±8.0 cm s-1 (ux, uy), < ±4.0 cm s-1 (uz) |
| Maximum Gain Error |
|
Measurement Resolution |
|
| ux, uy | 1 mm s-1 rms |
| uz | 0.5 mm s-1 rms |
| Ts | 0.002°C RMS (at 25°C) |
| Wind Direction | < 0.058° (ux = uy ≤ 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) |
|
Internal Monitor Measurements |
|
| Update Rate | 2 Hz |
| Inclinometer Accuracy | ±1° |
| Relative Humidity Accuracy |
|
| Board Temperature Accuracy | ±2°C |
SDM |
|
| -NOTE- | Used for data-logger-based data acquisition. |
| Bit Period | 10 µs to 1 ms |
| Cable Length |
|
| 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 |
|
| 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 |
|
| 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 |
|
| Current at 100 Hz Measurement Rate |
|
Dokumente
Broschüren Produkte
Videos & Tutorials
Downloads
CSAT3B Example Programs v.1 (4 kB) 20-10-2020
Three example programs.
Simple SDM Program: SDM communications are used to collect data from a single CSAT3B.
Simple CPI Program: CPI communications are used to collect data from a single CSAT3B.
Advanced CPI Program: A single CSAT3B is properly configured and CPI communications are used to collect the data.
CPI Calculator v.1.0 (2.49 MB) 06-07-2016
The CPI Calculator is a downloadable Microsoft Excel spreadsheet used to estimate the usage and capacity of a CPI network. The calculator provides an overview on CPI devices including the CDM-A108, CDM-A116, CDM-VW300, CDM-VW305, and the CSAT3B. The calculator can also estimate the measurement speed of the CDM-A108 and CDM-A116 based on the number of channels and measurement parameters.
The CPI Calculator is an estimation tool and will help you better understand and design CPI networks by considering the following:
- What is the capability of each CDM or CPI device
- What is the CPI network capacity
- How much of the CPI capacity are the CDMs or CPI devices using
FAQs für
Number of FAQs related to CSAT3B: 16
Alle anzeigenWenige anzeigen
-
The CSAT3A, CSAT3AH, CSAT3B, and CSAT3BH—like other sonic anemometers—measure wind speed along the sonic path using ultrasonic signals. If the salt spray blocks the sonic path, the sonic anemometer will not be able to make measurements. The same is true if a thick layer of salt is deposited on the transducer faces.
-
Campbell Scientific does not offer any mounting booms or hardware that enable easy and frequent positioning of the sonic anemometer sensor head. This type of hardware must be provided by the user.
-
The CSAT3A, CSAT3AH, CSAT3B, and CSAT3BH are calibrated over temperature for the effects of transducer delays on the wind speed, and to a lesser extent, for the speed of sound measurements.
There is no NIST-traceable standard for ultrasonic anemometers.
-
No. The offset is a function of temperature and time. Once a year, spot-check the sonic anemometer wind offset using the procedure outlined in the CSAT3B instruction manual. If the measured offset is outside the specification, return the sensor to the factory for calibration. To request a return material authorization (RMA) number, follow the steps listed on our Repair and Calibration page.
-
Ultrasonic anemometers are unable to make measurements if the sonic path is blocked. The path may become blocked by water that puddles on the lower transducer face or droplets that hang from the upper transducers. Sonic wicks, which come with all sonics, can be placed on the transducers to wick away moisture from the faces of the transducers. Ensure that these wicks are removed during cold conditions to prevent ice from building up around them.
-
The sonic anemometer offset specification is ±8 cm/s. Therefore, it cannot be used in an application where the expected wind speed is in the range of ±5 cm/s.
-
The sonic anemometer measures three-dimensional wind in a right-handed Cartesian coordinate system. From these measurements, use trigonometry to compute the wind flow angle, horizontal angle, and wind speed.
-
The CSAT3A or CSAT3B is calibrated over the temperature range of -30° to +50°C. The sonic anemometer operating temperature range can be shifted by 10 degrees to cover the range of -40° to +40°C. For low-temperature applications, it may be more appropriate to consider a heated version of our sonic anemometers.
The instrument will continue to operate outside the calibrated temperature range, until the signal becomes too weak; however, the proper calibration will not be applied to the measurements because the calibration file only spans the specified temperature range.
-
Yes. The CSAT3B and CSAT3BH measurement frequency can be changed by the user. The user can either choose a prompted or unprompted output rate. The prompted output rate is based on the scan interval of the data logger, which must be an integer. Therefore, the measurement frequencies supported would be 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, and 100 Hz. The unprompted output rate allowed is 10, 20, 50, and 100 Hz.