• 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 Speed Measurements:
• Range: 0-50 m/s
• Resolution: 0.01 m/s
• Accuracy (0-10 m/s): ±0.2 m/s
• Accuracy (11-30 m/s): ±2%
• Accuracy (31-50 m/s): ±4%

• 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.

• Power Supply Voltage: 10 - 54 VDC
• Power: 400 mW when no sensor is connected; up to 12 W maximum
• Environment: Suitable for outdoor use in wet locations
• Altitude: Up to 5000 meters
• Temperature: -20 to 50 °C
• Relative Humidity: 0 to 100%.
• Transient Overvoltage: Category II
• Temporary Overvoltage: 60 V
• Pollution Tolerance: Level 3 (enclosure must be intact and in good condition)

• Four Serial Ports for TriSonica^® Anemometers:
• UART-TTL or EIA232 voltage level
• Configurable baud rate and parity
• 12V output to power TriSonica^® sensors
• Trigger output to synchronize multiple pipe-mount type sensors

• Instrument Ports:
• LI-550P and LI-560 trigger output
• RS-232

• GPS Port and External Radio Port:
• NMEA0183 GPS
• TTL-UART
• I2C
• JST 6-pin GH connector
• GPS can be timing standard

• MicroSD Card Storage:
• Formats: FAT16, FAT32, exFAT
• Maximum card capacity: >32 GB

• Data Sampling:
• Maximum scan rate: 100 Hz
• Adjustable sampling rates
• User-definable response for missing data
• Real-time clock with time tagging option
• External connections ESD protected
• Weight: 450 g (16 oz.)