Ultrasonic Anemometer – 3S-UA
3S-UA is an ultrasonic anemometer that measures wind speed and wind direction without using any moving parts. Unlike mechanical cup-and-vane anemometers, it contains no rotating parts. It performs measurements using ultrasonic technology and provides both speed and direction data in a single, compact housing. It is used in areas such as weather stations, wind farms, ports, airports, and building facades.
The measured data is transmitted to data loggers and monitoring units via Modbus RTU digital output. The device has WMO-No.8 measurement compatibility.
Technical Specifications of Ultrasonic Anemometer
| Item Code | 3S-UA |
| Sensor Type | Ultrasonic |
| Measured Data | Wind speed and wind direction |
| Wind Speed Range | 0…75 m/s |
| Wind Direction Range | 0…360° |
| Wind Speed Uncertainty | ±0,2 m/s or ±%2 @ 0-35 m/s ±%3 @ > 35 m/s |
| Wind Direction Uncertainty | ±2° |
| Wind Speed Resolution | 0,1 m/s |
| Wind Direction Resolution | 0,1° |
| Response Time | 1 second |
| Data Output | RS485 from 4800 to 38400 Baud |
| Communication Protocol | Modbus RTU |
| Power Supply | 24…30 V DC (24 V DC recommended) |
| Power Consumption | Typically 35 mA @ 24 V DC @ 25°C |
| Cable Length and Features | 3/5/10 m 3x2x0,22 mm² 24 AWG LI2YC11Y-TP PUR cable, UV weather resistant, bending radius 35 mm (supplied on request) |
| Galvanic Isolation | 1000 V between the power supply and the RS485 line. |
| Operating Temperature Range | -20°C…+60°C |
| Weight | 480 g (620 g with mounting bracket) |
| Ingress Protection | IP65 |
| Housing Material | ASA |
| Dimensions | Ø156 x 258 mm (diameter x height) |
| Origin | Türkiye |
What is an Ultrasonic Anemometer Used For?
An anemometer is a device that measures wind speed and direction in a given area. This data is used in many fields, such as performance evaluation in solar and wind power plants, weather observation in meteorological stations, and operational safety in ports and airports.
The 3S-UA performs this measurement without any moving parts. This means you can continuously measure both wind speed and direction with a single device, without worrying about mechanical wear.
How Does an Ultrasonic Anemometer Work?
An ultrasonic anemometer sends and receives ultrasonic sound pulses between opposing sensors (transducers) in its body. Wind causes these pulses to travel faster in one direction and slower in the opposite direction. By measuring this difference in the time it takes for the pulses to travel back and forth, the device calculates both the speed and direction of the wind.
Because the measurement is entirely electronic, there are no rotating or friction-generating parts. This allows for both the precise detection of very low wind speeds and the rapid capture of sudden wind gusts and changes in direction. The response time is 1 second.
Why Ultrasonic Anemometers Instead of Mechanical Anemometers?
Traditional vane-cup anemometers rely on mechanical parts that rotate with the wind. These parts wear out over time, are susceptible to friction and bearing failures, and may not start rotating in very low winds. The 3S-UA has no moving parts, so it does not have any of these limitations.
- Longer lifespan, less maintenance. No mechanical parts to wear out, rub against, or break down, maintenance needs are minimized.
- Measurement even in low winds. It accurately measures even very low wind speeds that mechanical anemometers may not be able to detect.
- Fast response. It more accurately detects sudden gusts of wind and changes in direction.
- It is resistant to icing. It is much more resistant to mechanical failures caused by icing.
- Suitable for demanding conditions. Ideal for long-term, maintenance-free operation and harsh outdoor environments.
What are the Key Advantages of Ultrasonic Anemometers?
SEVEN ultrasonic anemometers offer many advantages as following:
- WMO-No. 8 measurement compliance.
- Compact design with no moving parts. Speed and direction in a single body.
- Easy integration via Modbus RTU output over RS485 and SunSpec compatibility.
- Configurable termination resistor via GUI. Practical setup for multiple device connections.
- Field-ready with UV-resistant ASA housing and IP65 protection rating.
- Free software updates, SEVEN remote installation and after-sales support, 2-year warranty.
How to Setup the SEVEN Ultrasonic Anemometer?
The device is secured with ground mounting holes and M5 bolts. Pay attention to a few points for accurate wind direction data.
- Align the device so that the north marker on its body faces true north. The accuracy of the wind direction measurement depends on this.
- Place the anemometer in an open, unobstructed spot where it can receive the wind freely.
- Separate the power and communication cables from the AC/DC power lines, ensure the cable bending radius is no less than 35 mm.
- Enable termination resistance via the GUI for multi-device setups.
- Install a ground connection to protect against electrical noise.
Frequently Asked Questions
What does 3S-UA measure?
It measures wind speed (0 - 75 m/s) and wind direction (0 - 360°) in a single device.
How does SEVEN Ultrasonic Anemometer work?
It sends ultrasonic sound pulses between opposing transducers and calculates wind speed and direction from the difference in the time it takes for these pulses to travel back and forth.
What are SEVEN Ultrasonic Anemometer’s advantages over a mechanical anemometer?
Because it has no moving parts, it does not experience wear, friction, or bearing failure. It has a longer lifespan, requires less maintenance, can measure very low winds, and is more resistant to icing.
Which output and protocol does SEVEN Ultrasonic Anemometer use?
It uses Modbus RTU (4800 - 38400 Baud) over RS485 and is SunSpec compliant.
What supply voltage is required for SEVEN Ultrasonic Anemometer?
It operates with 24-30 V DC. 24 V DC is recommended.
Which standard does SEVEN Ultrasonic Anemometer comply with?
It has WMO-No. 8 measurement compatibility.
What is the operating temperature range of SEVEN Ultrasonic Anemometer?
It operates between -20°C and +60°C.
What is the protection class of SEVEN Ultrasonic Anemometer?
It has an IP65 protection rating.
What is the warranty of SEVEN Ultrasonic Anemometer?
Two years warranty for each product.
What are price and delivery for SEVEN Ultrasonic Anemometer?
The unit price varies between 620-1125 EUR. Delivery times are between 3-4 weeks.
Does SEVEN Ultrasonic Anemometer come with a cable?
The SEVEN Ultrasonic Anemometer is available with optional cable lengths of 3 m, 5 m, or 10 m. Longer cable lengths can also be supplied upon request. For assistance in selecting the most suitable cable length for your application, please contact the SEVEN team.