CSAT3B 3-D Ultraschall-Anemometer mit integrierter Elektronik
Präzisionsmessungen
für Fluxmessungen und Strömungsforschungen
wetter wasser energie gas flux and turbulence bauwerke boden

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

  • Harsh Sonic Environment Option adds conformal coating to transducers to better withstand 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

Operating Temperature Range -30 to +50°C (equivalent to 312 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.)
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)
Filter Bandwidths 5, 10, 20, 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:
  • -30° to +50°C operating range
  • Wind speeds < 30 m s-1
  • Wind angles between ±170°
Maximum Offset Error < ±8.0 cm s-1 (ux, uy), < ±4.0 cm s-1 (uz)
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

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)
  • 795 ms (with 5 Hz bandwidth filter)
  • 395 ms (with 10 Hz bandwidth filter)
  • 195 ms (with 20 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)

Kompatibel mit

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Datenlogger

Product Compatible Note
CR1000 (retired)
CR1000X
CR200X (retired)
CR216X (retired)
CR300
CR3000
CR3000
CR6
CR800
CR850
CR9000X (retired)

Miscellaneous

Product Compatible Note
CR310

Downloads

CSAT3B OS v.3.02 (548 KB) 14-10-2019

Current CSAT3B Operating System.

Liste der Änderungen

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:

  1. What is the capability of each CDM or CPI device
  2. What is the CPI network capacity
  3. How much of the CPI capacity are the CDMs or CPI devices using

 

FAQs für

Number of FAQs related to CSAT3B: 15

Alle anzeigenWenige anzeigen

  1. The CSAT3 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.

  2. Campbell Scientific does not offer any mounting booms or hardware that enable easy and frequent positioning of the CSAT3 sensor head. This type of hardware must be provided by the user.

  3. 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.

  4. The CSAT3 is 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.

  5. No. The offset is a function of temperature and time. Once a year, spot-check the CSAT3 wind offset using the procedure outlined in the CSAT3 instruction manual. If the measured offset is outside the specification, return the CSAT3 to the factory for calibration. To request a returned material authorization (RMA) number, follow the steps listed on our Repair and Calibration page. 

  6. The CSAT3 is calibrated over the temperature range of -30° to +50°C. The CSAT3 operating temperature range can be shifted by 10 degrees to cover the range of -40° to +40°C.

    The instrument will continue to operate outside the calibrated temperature range; however, the proper calibration will not be applied to the measurements because it does not exist in the CSAT3 electronics.

  7. The CSAT3 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.

  8. Yes. The CSAT3 measurement frequency can be changed by the user. It is set by the Execution Parameter. This parameter is described in detail in the CSAT3 instruction manual in the “Datalogger Instruction Parameters” section, as well as in the “CSAT3 RS-232 Commands” section of Appendix B.

  9. The CSAT3, like other sonic anemometers, measures wind speed along the sonic path using ultrasonic signals. If the salt spray blocks the sonic path, the CSAT3 will not be able to make measurements. The same is true if a thick layer of salt is deposited on the transducer faces.