• Classifi ed acc. to IEC 61400-12-1:2017
• Measurement of wind direction, wind velocity and
virtual temperature
• Highest precision, maintenance-free, different heating options
• Digital & Analog outputs
Description
The Ultrasonic Anemometer 2D is designed to acquire the horizontal components of wind velocity and wind direction as
well as the virtual temperature in two dimensions. Due to the measuring principle the instrument is ideal for inertia-
free measurement of gusts and peak values.
Wind velocity and direction
The speed of propagation of the sound in calm air is superposed by the velocity components of an air ow in the direc-
tion of the wind. A wind velocity component in the propagation direction of the sound supports the speed of propagation;
i.e. it increases if while a wind velocity component against the propagation direction reduces the speed of propagation.
The propagation speed resulting from superposition leads to different propagation times of the sound at different wind
velocities and directions over a xed measurement path. As the speed of sound greatly depends on the temperature
of the air, the propagation time of the sound is measured on each of the two measurement paths in both directions.
This rules out the in uence of temperature on the measurement result. By combining the two measuring paths which
Ultrasonic Anemometer Thies 2D
Dimensional drawing
S82100H: Heating of sensor arms
S82200H: Heating of sensor arms and ultrasonic converters
S82300H: Extra strong heating for the whole sensor incl. housing
S82800H: Upside down installation for winter operation with
heating of sensor arms and ultrasonic converters
are at right angles to each other, the measurement results of the sum
and the angle of the wind velocity vector are obtained in the form of
rectangular components. After the rectangular velocity components
have been measured, they are converted to polar coordinates by the
digital-signal-processor of the anemometer and output as a sum and
angle of wind velocity.
Acoustic virtual temperature
The thermodynamic interrelationship between the propagation veloc-
ity of sound and the absolute temperature of the air is de ned by a
root function. The physical interrelationship between sound velocity
and temperature is ideal when measuring the air temperature as long
as the chemical composition is known and constant.
Heating
The Ultrasonic is equipped with a sophisticated heating system, which
keeps all outer surfaces that might disturb the data acquision in case
of ice formation, ef ciently on a temperature above +5°C. The convert-
ers carrying arms belong to the heated outer surfaces, as well as the
ultrasonic converters itself and the housing – depending on the model.
The Ultrasonic is able to acquire measuring data with high accuracy
even in unheated state at temperatures down -40 °C. There is no tem-
perature-depending quality of the measuring data. The heating is nec-
essary only for avoiding ice formation on the instrument construction
and the associated blockage of the run time data acquisition.
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Ultrasonic Anemometer Thies 2D
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Alignment to north with North ring adapter (S83010)
We recommend installing a North ring adapter (1; yellow), which assists aligning the sensor
correctly and avoids re-alignment after sensor replacement.
The North ring adapter is installed between sensor and boom. It is equipped with a north pin
(2; red) and a direction bearing tube (3; violet). By selecting a xed point in north direction,
the adapter can easily be aligned and xed with screws on the boom. Remove the tube and
place the sensor on the adapter. The sensor is mounted with its north drilling on the north
pin of the adapter and screwed in place.
Using Ultrasonic anemometers for wind energy assessments in cold climates
Ultrasonic anemometers have proven to be ideally suited for harsh winter conditions in comparison to traditional cup
anemometers. Advantages of ultrasonic anemometers are:
• Very effective heating system including all relevant parts of the sensor
• Distinct failure notice in cases of icing
• No “slowing down”-effects due to icing
• No inuence of the heating on mechanical and aerodynamic features of the sensor
The Ultrasonic anemometer Thies 2D is available with different heating options:
Order No. S82100H S82200H + S82800H S82300H
Heating options • Sensor arms • Sensor arms
• Ultrasonic converters
• Sensor arms
• Ultrasonic converters
• Housing
In order to reduce snow and ice formation on top of the sensor, you can install the sensor upside down (S82800H). Thus
snow or ice is falling down and does not pile up on the sensor.
Note: Take care of the cable connection. It must be ensured that no water gets into the shaft and connector or cable
gland of the sensor. Ask for a special conguration of the sensor with cable gland at the side (see picture below).
Order No.
S82800H
Ultrasonic Anemometer Thies 2D
Wind Speed
Measuring range 0 ... 75 m/s, scaling of the analog output is free selectable (Starting threshold: 0.01 m/s)
Accuracy ± 0.1 m/s @ ≤ 5 m/s
± 2% of meas. value @ > 5 m/s
Resolution 0.1 m/s (standard)
< 0.01 m/s (user-dened)
Wind Direction
Measuring range 0 ... 360°
Accuracy ± 1°
Resolution 1° (standard), < 1°(user-dened)
Virtual Temperature
Measuring range -50 ... +70°C
Accuracy ± 0.5 K to 35 m/s
Resolution 0.1 K (standard)
Data Output Digital
Interface RS485 / RS422
Baud rate 1200 to 230400 selectable
Output Instantaneous values, wind speed / direction and acoustic-virtual temp.
Sliding mean values 0.5 sec to 100 min freely selectable
Output rate 1 per 1 msec to 1 per 60 sec., adjustable
Status identication Heating, measurement path failure, ΔT path temperatures
Data Output Analog
Electr. output 0 ... 20 mA / 0 ... 10 V or 4 ... 20 mA / 2 ... 10 V, wind velocity & direction, virtual temp.
Output Instantaneous values, sliding mean values 0.5 sec to 100 min freely selectable
Output rate Updating rate 1 to 100 msec
Resolution 16 bit
Analog Inputs
Input number Up to 3 analog inputs possible. (3x standard, 2x add. congurable acc. to manu.)
Input resolution 16 bit
Sampling rate 0.1 ... 100 Hz per channel
Input range 0 ... 10 V
Data processing Output of measured values in user-specic telegram
Accuracy ± 1% of meas. value in the range -40 ... +70°C
Linearity, integral INL: type < 6LSB
Effective low-noise bits Type 14 bit (at DC-supply for avoiding of dynamic cross-talk in the connection line)
General
Temperature range Oper. temperature: -50 ... +80°C (heated), -30 ... +80 °C (unheated)
Storage: -50 ... +80°C
(Measuring operation possible with heating down to -75°C)
Internal measuring rate Up to 400 measurements per second at 20°C
Operating voltage
S82100H
S82200H
S82300H
S82800H
Power supply electronics: 8 ... 78 V DC, 1.5 VA, max. 2.5 VA
Power supply electronics + heating: 24 V AC/DC ± 15%: typ. 80 VA, max. 90 VA @ 24V
Power supply electronics + heating: 24 V AC/DC ± 15%: typ. 85 VA, max. 90 VA @ 24V
Power supply electronics + heating: 48 V AC/DC ± 15%: typ. 280 VA, max. 310 VA @ 48V
Power supply electronics + heating: 24 V AC/DC ± 15%: typ. 85 VA, max. 90 VA @ 24V
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Ultrasonic Anemometer Thies 2D
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General (continued)
Electr. connection 8-pole plug
Mounting Mast tube 1 ½”, e.g., DIN 2441
Protection IP 67
Weight 2.5 kg
Manufacturer Thies
Ammonit Meteo-40 RS485-M (Half duplex, 2-wire, baudrate: 38400 bps)
Accessory Module set M83575 (incl. isolated repeater)
Sensor Connection to Ammonit Meteo-40 Data Loggers
In order to connect the Ultrasonic sensor to the Ammonit Meteo-40 data logger, an additional module set (M83555 or
M83575) has to be installed between sensor and data logger.
Connector Pin Assignment (Serial interface, half-duplex and analog outputs)
Plug
Pin No.
Ammonit
Wire Color
Allocation Function Solder terminal of
coupling socket
1 WG* Analog output wind speed
2 brown TXD- / RXD- Serial interface
3 green
ADIO (Analog Digital Input Output)** Function congurable
4 WR* Analog output wind direction
5 white TXD+ / RXD+ Serial interface
6 yellow AGND Analog ground
7 red/pink AC/DC Supply, reverse-polarity protected
8 blue/grey AC/DC Supply, reverse-polarity protected
* If congured by Ammonit, Pin not used.
** Pin congured for analog output of wind speed. OR If heating is managed by the Meteo-40 data logger, Pin 3 is congured
to switch the sensor heating.
Cable type (without heating): LiYCY 4 x 2 x 0.25 mm²
