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The Automatic Weather station logs various parameters of weather data and displays the results in almost real time. The sensors measure Air temperature, Rainfall, Barometric Pressure, Sunshine, Wind Speed and Wind Direction.

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Rainfall Sensor

The Rainfall Sensor is mounted in U.V stable plastic and is aerodynamically shaped to reduce the effects of wind. The rain is collected by a funnel having an outer diameter of 80mm, therefore, 5ml of rain water will represent 1mm of rainfall.
The Rainfall Sensor measures the amount of rainfall passing through it by means of an infra-red optical system.

 
Automatic Weather Station
 

 


 
 
  Automatic Weather Station
 

 

Sunshine Sensor

The sensor is manufactured from anodised aluminium with a laboratory glass dome. The unit is fully sealed against the ingress of moisture and sturdily built to withstand the most adverse weather.
Comparing direct sunlight with shade the sensor produces a pulse every 36 seconds (0.01 hour) when the ratio exceeds a certain pre-set level ensuring that the output is independent of time of day or season, giving excellent results within a few minutes of dawn or dusk.

 
 
 

Wind Sensor (Wind Speed & Direction)

The combined Wind Speed and Direction Sensor is manufactured from anodised aluminium alloy, UPVC and stainless steel with moulded polypropylene cups. 
Wind Direction is sensed by a precision conductive plastic potentiometer which provides exceptional accuracy and high sensitivity.
Wind Speed is derived from a Hall Effect solid state magnetic switch activated by magnets in the cup rotor running in precision stainless steel ball race providing very high senstivity.

 
 
 
  Automatic Weather Station

 

The Automatic Weather Station was supplied by Instromet and the logging and display software was developed in-house using PERL.


 

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Last Revised: 6th September 2001
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