CSAT3BH Heated, 3-D Sonic Anemometer with Integrated Electronics

Provides continuous, reliable data year-round in harsh environments

The CSAT3BH is ideal for stations that are deployed in cold climates. The easy-to-use CSAT3BH sonic anemometer features smart heating that delivers just the right amount of heat to keep the instrument free of ice and snow, enabling continuous and reliable measurements in cold environments. The CSAT3BH is designed to prevent ice accumulation on the sensor, avoiding prolonged periods of data loss. 

The CSAT3BH features variable power, only delivering power when needed—as opposed to the common method of providing two-way heating (on/off). Moreover, there are real-time data flags when the heaters are turned on, which is crucial to post-processing your data files. 

The CSAT3BH is a heated version of the CSAT3B 3-D Sonic Anemometer with Integrated Electronics. The specifications of the CSAT3BH are the same as the CSAT3B with regard to wind measurements. 

Category:

The CSAT3BH provides integrated two-zone smart heating:  

  • Zone 1 consists of the arms and strut. 
  • Zone 2 provides heating to all the transducers. 

The smart heating uses environmental conditions and a controller to apply variable heating to the sonic anemometer to keep the body and transducers free of ice and snow. The CSAT3BH is designed to prevent ice from forming on the arms and fingers of the system. The block has no heating in it. The CSAT3BH has a separate controller that is used to control the heating algorithm of the sensor. The controller requires a temperature/RH input. There is an ambient temperature and relative humidity sensor that is standard for use with the controller, or the data can be provided through a user-supplied temperature/RH sensor. 

Physical 

The CSAT3H heater controller is a polycarbonate enclosure sized 20.32 x 25.4 x 15.24 cm (8 x 10 x 6 in.). The enclosure uses connectors for incoming power, heaters, temperature sensors, temperature/RH, RS-485(2), and USB. 

Electrical 

The heaters are controlled on two zones and require 150 W at full power. The controller controls the heaters by increasing or decreasing the voltage to get the appropriate wattage to keep ice from forming on the sensor. 

Benefits and Features 

    • New conformal coating helps protect sonic transducers in corrosive environments 
    • Two-zone heating to keep both the transducers and body of the sonic anemometer free of snow and ice 
    • Heating controller using environmental feedback to ensure power budgeting 
    • Streamlined heater integration to ensure maintenance of sonic aerodynamics 
    • Integrated data flagging, providing critical information when heaters were operational 
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.)
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 1.9 kg (4.2 lb)
Anemometer Dimensions 63.1 x 12.3 x 43.3 cm (24.8 x 4.9 x 17.0 in.)
Power Requirements
Anemometer Voltage Requirement 9.5 to 32 Vdc
Current Required for 10 Hz Measurement Rate
  • 110 mA (@ 12 Vdc)
  • 65 mA (@ 24 Vdc)
Current Required for 100 Hz Measurement Rate
  • 145 mA (@ 12 Vdc)
  • 80 mA (@ 24 Vdc)
Heaters 6.2 A (@ 24 Vdc)
Arms and Strut
  • 0.74 A nominal (@ 24 Vdc)
  • 2.46 A at maximum heating (@ 24 Vdc)
Transducer Fingers
  • 1.13 A nominal (@ 24 Vdc)
  • 3.75 A at maximum heating (@ 24 Vdc)
Total System Power
  • 1.86 A nominal (@ 24 Vdc)
  • 6.2 A at maximum heating (@ 24 Vdc)
Controller Current Required 30 mA (heaters off [quiescent] @ 24 Vdc)
Wind Accuracy
-NOTE- Accuracy specifications assume the following:

  • -40° 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 anemometer 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 anemometer configuration or PC-based data acquisition.
Connection Speed USB 2.0 full speed 12 Mbps
Cable Length 5 m (16.4 ft) maximum

 

Manuals: CSAT3BH Packing Information

Download

Manual: CSAT3BH Quick Deploy Guide

Download

Manual: CSAT3BH Three-Dimensional Heated Sonic Anemometer

Download

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