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 FT702LM1
The LM1 has an RS-422 serial digital interface, which 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
Connector pin details FT702LM5
The LM5 has an RS-485 serial digital interface, which 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
Voltage supply
Sensor 4.4V to 30V dc @12mA (typical excluding data output drive current)
Heater 10V to 30V dc @ 2.5A (max)
