Section 2 Functional Description
9 FT742-DM (RS485) Sensors – User Manual
2 FUNCTIONAL DESCRIPTION
2.1 Technical Performance
Sensor Performance
1 & 2
Measurement Principle Acoustic Resonance (compensated against variations in temperature,
pressure and humidity)
Wind speed Measurement
Range 0-75m/s
Resolution 0.1m/s
Accuracy ±0.3m/s (0-16m/s)
±2% (16m/s-40m/s)
±4% (40m/s-75m/s)
Knots and km/h options available.
Wind Direction Measurement
Range 0 to 360°
Accuracy 4° RMS
Resolution 1
Environment
Temperature Range -40 to +85C (operating and storage)
Humidity 0-100%
Altitude 0-4000m
Data I/O
RS485 Interface Digital RS485, galvanically isolated from power supply lines and
case
Format ASCII data, polled or continuous output modes
Data Update Rate Up to 10 measurements per second (10Hz)
Power Requirements
3
Supply Voltage 24VDC nominal (12-30VDC range)
Supply Current (Heater off) 31mA (typical)
Supply Current (Heater on) 6A (max
5
) – The heater is thermostatically controlled. Heater power
consumption will depend on the heater energy required to keep the sensor’s
temperature at a user determined set point. The sensor is limited to 4A and
99W
4
by the default software settings (the heater current and voltage limits
can be modified, see Sections 6.4.11 & 6.4.13 for further details or contact
FT Technologies).
Physical
Weight 380g (without size adaptors)
Material Aluminium alloy (hard anodised)
I/O Connector 5 way (RS485 option)
Mounting Method Pipe-Mount screw fix (33.7mm external diameter EN10255 pipe).
Various size adaptors and pipe-inserts available.
Notes:
1. All specifications subject to change without notice.
2. Specifications calculated with the default settings and filters enabled.
3. See safety instruction requirements (page 5 and 6).
4. The heater set point, current limit and maximum power limits can be pre-configured in the factory or
adjusted using the FT Acu-Test Digital kit.
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