USEFUL GUIDE FOR THE INSTALLATION OF SENSORS
The right place and method of installation of sensors is important for the purpose of obtaining reliable and papers valid data.
Installation guides have been suggested by the World Meteorological Organization, the National Weather Service and the US National Weather Service. These suggestions are summarized below:
-Wind direction and speed:
- The standard height for wind measurement is 10 m above the ground. In some particular applications (such as in fighting forest fires), is performed to 6 m.
- The distance between the sensor and any obstruction (natural or artificial) should be at least 10 times the height thereof.
- If the sensor is mounted on a building, to be installed at 1.5 times the height of it, in order to get him away from the area where the flow of air must be disturbed.
- In tall buildings this may not always fulfilled, so it is recommended to assemble a mast in 3.5 to 5 m. high-side and the prevailing winds.
- If the sensors are mounted on a stand on a tower, the support must be greater length of 2 times the diameter or diagonal of the tower. Well and should be installed on the side of the prevailing winds.
-Temperature and humidity:
- Standard height for installation of these sensors is 1.25 to 2 m above the ground, although special requirements can be used other altitudes.
- The floor under the sensors should be short grass or natural terrain, but never concrete or asphalt.
- The area underneath the sensors must be open at least 9 m. in diameter, also while avoiding steep slopes, hills and holes.
- The distance between the sensors and any obstructions (natural or artificial) should be at least 4 times the height of the obstruction.
- If a tower is mounted on the support should be at least once the diameter or diagonal of the tower.
- Temperature sensors must have the suction down.
- It is desirable location on a high platform or roof of a building.
- The location must be free of obstructions capable of causing shadow on the sensor.
- Colored walls, or artificial sources of radiation should be avoided.
- The gauge should be mounted using the bubble level, 1.5 m height from the soil level.
- The area around the sensor must be of natural vegetation or gravel. It should not be pavement because it can cause splashing.
- The distance between the sensor and any obstruction to the wind must be at least 2 times the height of it.
- In open areas it is advisable to use wind shields.