NEW LI-550

TriSonica® Mini

Wind and Weather Sensor

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The LI-550 TriSonica® Mini Wind and Weather Sensor is a compact, lightweight sonic anemometer and weather sensor with low power requirements. It is small enough to fit in the palm of your hand, yet it is a powerful and highly accurate tool for atmospheric monitoring, weather reporting, and ecosystem research.

With a measurement path of 35 mm and weight of 50-67 grams, its size and featherweight profile make it perfect for many uncrewed aerial systems (UAS), while the fact that it has no moving parts allows it to be stationed on fixed or portable towers for real-time 3-dimensional* air flow measurements. It provides wind speed, direction, temperature, humidity, pressure, tilt, and compass data.

The LI-550 also provides measurements of all three dimensions of air flow. The open path provides the least possible distortion of the wind field. Because there are four measurement paths, the path with the most distortion can be removed from the calculations to provide more accurate wind measurements.

LI-550F and LI-550P studio photography

LI-550F flat base and LI-550P pipe-mount base

The LI-550F has a flat base for a variety of mounting options. The LI-550P features a pipe-mount base accommodating any 1/2” DN15 Schedule 10 pipe or thin-walled 22 mm carbon fiber pipe. Data and power wires are run through the mounting tube for a streamlined appearance and protection from rotors. Tripod adapters are available for both models.

LI-570 TriSonica Data Logger

The LI-570 TriSonica Data Logger is small, lightweight, weather-resistant, and can collect data from multiple devices, including multiple TriSonica sensors.

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studio photo of LI-570 TriSonica Data Logger

* The LI-550 makes vertical wind measurements up to ±15° from the horizontal. The LI-560 TriSonica® Sphere Ultrasonic Anemometer provides full vertical wind measurements.

TriSonica 550USB studio photo


The USB adapter for configuring the anemometer and viewing data is available (it is not for outdoor use). We also offer cables for power and data transfer to the LI-570 Data Logger and customer-supplied equipment, as well as mounting adapters for tripods and custom platforms.

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LI-550 Specifications

  • Power Supply Voltage: 5 - 32 VDC
  • Power: 400 mW
  • Operating Environment:
    • Altitude: Up to 5000 meters
    • Temperature: -20 to 72 °C
    • Relative Humidity: 0 to 100% (non-condensing). System may require reset if condensation accumulates within enclosure.
    • The 550USB is not rated for outdoor use.
  • Transient Overvoltage: Category I
  • Temporary Overvoltage: 40 Volts
  • Pollution Tolerance: Level 3 (enclosure must be intact and humidity vent in good condition)
  • Sampling Frequency: 40 Hz maximum
  • Ultrasonic Frequency: 60 kHz ±5 kHz
  • Weight: 50-67 grams
  • Size:
    • LI-550F: 9.1 x 9.1 x 5.2 cm
    • LI-550P: 8 × 8 × 7.3 cm
  • Digital Output: RS-232, RS-422, UART-3V
    • LI-550F: RS-232
    • LI-550P: RS-232, RS-422, UART-3V
  • Output Rate: 1 Hz, 2 Hz, 5 Hz, 10 Hz, 20 Hz, or 40 Hz
  • Wind Direction Measurements:
    • Resolution (u/v/w): 1.0°
    • Range (u/v): 0 to 359°
    • Accuracy (u/v): ±1.0°
    • Range (w): ±15° from the horizontal plane of the instrument
    • Accuracy (w): 0.2 m/s
  • Humidity Sensor:
    • Range: 0 to 100% RH
    • Resolution: 0.01%
    • Accuracy: ±3%
  • Pressure Sensor:
    • Range:50 to 115 kPa
    • Resolution: 0.01 kPa
    • Accuracy: ±1.0%
  • Temperature Measurements:
    • Range:-20 °C to 72 °C
    • Resolution: 0.01 °C
    • Accuracy: ±2.0 °C
  • Magnetometer:
    • Range (u, v, w): ±50 Gauss
    • Heading Accuracy: ±5°
  • Accelerometer:
    • Range (u, v, w): ±2 g
    • Tilt (pitch, roll): ±90°

Specifications subject to change without notice.

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