Data Sheet

Weather Sensor Assembly p/n 80422

Imported by Argent Data Systems

Usage Notes

This kit includes a wind vane, cup anemometer, and tipping bucket

rain gauge, with associated mounting hardware. These sensors

contain no active electronics, instead using sealed magnetic reed

switches and magnets to take measurements. A voltage must be

supplied to each instrument to produce an output.

Assembly

The wind sensor arm mounts on top of the two-piece metal mast and

supports the wind vane and anemometer. A short cable connects the

two wind sensors. Plastic clips on the underside of the arm hold this

cable in place. Screws are provided to secure the sensors to the arm.

The rain gauge may be mounted lower on the mast using its own

mounting arm and screw, or it may be mounted independently.

Rain Gauge

The rain gauge is a self-emptying tipping bucket type. Each 0.011”

(0.2794 mm) of rain causes one momentary contact closure that can

be recorded with a digital counter or microcontroller interrupt input.

The gauge’s switch is connected to the two center conductors of the

attached RJ11-terminated cable.

Anemometer

The cup-type anemometer measures wind speed by closing a contact

as a magnet moves past a switch. A wind speed of 1.492 MPH (2.4

km/h) causes the switch to close once per second.

The anemometer switch is connected to the inner two conductors of

the RJ11 cable shared by the anemometer and wind vane (pins 2 and

3.)

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Weather Sensor Assembly p/n 80422 Imported by Argent Data Systems Usage Notes This kit includes a wind vane, cup anemometer, and tipping bucket rain gauge, with associated mounting hardware. These sensors contain no active electronics, instead using sealed magnetic reed switches and magnets to take measurements. A voltage must be supplied to each instrument to produce an output. Assembly The wind sensor arm mounts on top of the two-piece metal mast and supports the wind vane and anemometer.
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Wind Vane The wind vane is the most complicated of the three sensors. It has eight switches, each connected to a different resistor. The vane’s magnet may close two switches at once, allowing up to 16 different positions to be indicated. An external resistor can be used to form a voltage divider, producing a voltage output that can be measured with an analog to digital converter, as shown below. The switch and resistor arrangement is shown in the diagram to the right.