US 4,380,248 AGranted

Equipment for the measurement of evaporation and/or precipitation

AssigneeGanz Muszer Muvek

InventorsValeria Ambrus, Henrik Karsai

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Abstract

The invention represents an evaporation and/or precipitation measuring equipment, which can measure with high-accuracy, continuously and automatically the evaporation of an open water surface and simultaneously eventual precipitation. The value of evaporation, which is defined as the decrease of the water level of a standard evaporation measuring vat, is measured by the equipment with the quantity of water necessary to compensate the original level. Precipitation on the other hand is measured with that quantity of water which needs to be let out in order to restore the original water level of the vat. The high accuracy can be obtained on the one hand by adjusting deliberately small feeding resp. lower quantities. On the other hand the sensing unit of the equipment watches the water level of the evaporation measuring vat with high accuracy, and controls the supply and lower units respectively when the level varies due to either evaporation or precipitation. The electronic circuit of the equipment counts separately the quantities dosed and lowered respectively, and leads said information e.g. to a recording instrument.

Claims2

Dependent claims

Apparatus for the measurement of evaporation and precipitation, comprising an open-topped pan for a quantity of water, said pan fluidly connected to feeding and tapping means for detecting a predetermined water level in the pan, means responsive to a fall in the water level in the pan below said predetermined level to feed a first plurality of quantities of water of predetermined volume to the pan until said predetermined water level is restored, means responsive to a rise in water level in the pan above said predetermined level to tap from the pan a second plurality of quantities of water of predetermined volume until said predetermined water level is restored, a float chamber connected in fluid communication with said pan through a tube of relatively small cross section disposed below said predetermined level, a float in said float chamber, means responsive to the height at which said float floats in said float chamber to control said feeding means and tapping means, and means for counting and recording as evaporation said first plurality of quantities of water of predetermined volume and for counting and recording as precipitation said second plurality of quantities of water of predetermined volume and providing a continuous measurement.

Dependencies are inferred from the claim text.