Section 2
Functional Description
8
FT205EV Wind Sensors
– User Manual
2 FUNCTIONAL DESCRIPTION
2.1 Technical Performance
Sensor Performance
1
Measurement Principle
Acoustic Resonance (compensated against variations in
temperature, pressure and humidity)
Wind Speed Measurement
Range
0-75 m/s (0-270 km/h, 0-145.8 knots)
Resolution
0.1 m/s
Accuracy
±0.3 m/s (0-16 m/s)
±2% (16 m/s-40 m/s)
±4% (40 m/s-75 m/s)
Wind Direction Measurement
Range
0 to 360°
Sensor Accuracy
4
RMS
Compass Accuracy
2
5° RMS
Resolution
1
Acoustic Temperature Measurement
3
Units
Celsius, Fahrenheit or Kelvin
Resolution
0.1°
Accuracy
±2°C under the following conditions:
Wind speed between 5m/s and 60m/s
Temperature Difference < 10°C (Sensor Temp. vs Air Temp.)
Operating (air) temperature between -20°C and +60°C
Environment
Temperature Range
-20° to +70°C (operational)
-40° to +85
C (storage)
Humidity
0-100%
Altitude
0-4000m
Data I/O
Interface options:
RS422 (full-duplex)
RS485 (half-duplex)
Buffered UART full-duplex (3V & 5V TTL compatible)
Format
ASCII
‘Polled’ or ‘Continuous Update’, Polar and NMEA 0183
Data Update Rate
Up to 10 measurements per second (10 Hz)
Power Requirements
4
Supply Voltage
6-30 VDC range (24 VDC nominal)
Sensor Current
30mA typical
Physical
Weight
100 g
External Body Material
Nylon and graphite composite
I/O Connector
Molex CLIK-Mate (Molex part 505405-0860)
I/O Cable
Molex CLIK-Mate (Molex 600mm part 15135-0806)
Mounting Method
Surface-Mount (adaptor available for pipe-mounting)
Notes:
1. All specifications subject to change without notice. Specifications calculated with the default settings
and filters enabled
2. Requires user calibration (see Section 2.5)
3. See Sections 2.9, 6.4.2 to 6.4.4 for further details
4. See safety instruction requirements (page 5). A suitable PSU capable of providing up to 0.2A maximum
is recommended. RS422 current load is dependent on topology and resistor values,
RS422 in ‘always
enabled’ mode may draw higher currents. See Section 5.2 for RS422 power requirement details
