FT702LM wind sensor
| Overview | Technical Specification | Installation | Market Sectors |
Overview
The FT702LM is an ultra-compact anemometer which uses our patented Acu-Res® airflow sensing technology to measure accurately both wind speed and direction.
Our OEM (Original Equipment Manufacturer) wind sensor is designed for integration into a wide range of engineering systems.
The LM2 Version includes an electronic compass.
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- Designed for integration into OEM equipment
- Ultra-compact (70mm x 78mm)
- Low power consumption (66mW)
- Light weight (234g), rugged and portable
- Built in self-regulating anti-icing heaters
- Sealed to IP67
- NMEA 0183 compatible
- Corrosion resistant surface finish
- Optional integrated compass - FT702LM2
- Wind speed output in m/s, km/h or knots available
Interface and Data format
The sensor can output up to 5 readings per second via a RS422 or RS485 interface. There is a 10-way connector in the sensor’s base for the power and data connections.
Data is transmitted in digital with serial messages in ASCII. The sensor is NMEA 0183 (MWV sentence) compatible and wind speed measurement in knots is now available, making it ideal for use with other marine electronic devices. (Wind speed measure in knots only available in software version 3.8. Please contact FT for assistance with updating sensor software.)
Physical
Its small size, light weight, robust construction and ease of integration give designers maximum flexibility.
Datasheet
If you have any technical enquiries or require a quotation, please contact us.
| Overview | Technical Specification | Installation | Market Sectors |
Technical specification
Sensor Performance
Measurement principle
Acu-Res® Technology Acoustic Resonance (compensated against variations in temperature, pressure and humidity)
FT patented Acoustic Resonance airflow measuring system
Wind Speed Measurement
Range: 0-50m/s
Accuracy: ±4%
Resolution: 0.1m/s
Zero Error: ±0.1m/s
Wind Direction Measurement
Range: 0° to 360°
Accuracy: ±4°
Resolution: 1°
Compass Accuracy (FT702LM2 ONLY): ≤ 5° RMS
Data I/O
Interface: S-422 or RS-485
Format: Full range of user programmable functions. NMEA 0183 (MWV sentence) ASCII data output format.
Data Update Rate: 5 measurements per second
Power requirements
Anemometer:
FT702LM1: 4.4V to 30V dc @15mA (typical – exclude data o/p drive current)
FT702LM2: 4.4V to 30V dc @16mA (typical – exclude data o/p drive current)
Heater: 10V to 30V dc @ 2.5A (max)
Physical
Dimensions: 70mm x 78mm (nominal dia. x height)
Weight: 233.5g (sensor stand alone) 250g (with accessories: gasket)
Material: Aluminium alloy, hard anodised.
I/O Connector: 10 way connector (p/n Harwin M80-867 1022). Mating connector (p/n Harwin M80-8891005)
Mounting Method: Threaded holes (M4) x6 in base
Environmental specification
Operating Temperature Range: -40° to +85°C
Storage Temperature: -40° to +85°C
Humidity: 0-100%
Dust and Immersion: Sealed to IP67 (when correctly installed with supplied gasket)
Standards
EN 61000-6-3 (2007 inc. A1:2011) Emission standard for residential, commercial and light-industrial environments
EN 61000-6-2 (2005) Generic Standard - Immunity for Industrial Environments
EN 61000-4-2 (2009) Electrostatic discharge immunity test
EN 61000-4-3 (2010) Radiated, radio-frequency, electromagnetic field immunity test
EN 61000-4-8 (2010) Power frequency magnetic field immunity test
EN 61000-4-9 (2009) Pulse magnetic field immunity test
EN 61000-4-10 (1994; A1:2001) Damped oscillatory magnetic field immunity test
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Installation: mounting and connections
Mounting details
The wind direction datum is indicated by a small circular indentation on the lower half of the sensor (located below sensor label). The datum is offset by 6deg from the 60deg pitch of the fixing holes (see right).
The sensor should be mounted using the supplied gasket to ensure adequate sealing is achieved.
The six fixing holes are M4 threaded. Maximum screw depth is 5mm (plus 1.6mm to allow for gasket thickness).
Electrical connections
Electrical connections to the FT702LM are made via a Harwin 10 way connector.
Wind sensor connector Harwin p/n M80-8691022
Connector pin details RS-422
The LM wind sensor with RS-422 serial digital interface uses a differential pair Rx to receive information (2 wires A&B) and a differential pair Tx to transmit information (2 wires A&B). You can transmit and receive at the same time, as the transmit wires are separate to the receive wires.
View of the fixed connector looking at base of wind sensor (RS-422)
Connector pin details RS-485
The FT702LM wind sensor with RS-485 serial digital interface uses the same differential pair (2 wires Data A and Data B) to transmit and receive information. Each device (sensor and controller) must take it in turns to listen and talk otherwise the communications will be corrupted.
View of the fixed connector looking at base of wind sensor (RS-485)
Voltage supply
Sensor 4.4V to 30V dc @12mA (typical excluding data output drive current)
Heater 10V to 30V dc @ 2.5A (max)
| Overview | Technical Specification | Installation | Market Sectors |
Market sectors and OEM applications
Existing OEM applications
The FT702LM is used in a wide range of fixed and mobile systems. Examples include:
- Vehicle mounted meteorology systems
- CBRN (Chemical, Biological, Radiological and Nuclear) integrated monitoring systems
- Ship based meteorology systems
- Fixed and portable weather stations
Sectors
We are discussing potential applications in many sectors including:
- Military and Civil defence
- Semiconductor manufacturing
- Naval Engineering and Oceanology Research
- Marine meteorology
- Infrastructure (cranes, bridges, roads, airports)
If you think that the FT702LM series could help you in your project please contact us.
