Evaporimeters are mainly used by farmers and growers to measure evapotranspiration (ET-measure of all of the water that evaporates from land surfaces plus the water that transpires from plant surfaces) rates of crops at fields.The weight may be 30-50kg;Rotary speed is 10-140r/min;Rotating speed is 0-120rpm.Designed sealing systems, corrosion resistance,high evaporation efficiency, high recovery rate,convenient operation and easy maintenance are its features.

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Detailed Description for Evaporimeter

An Atmometer or Evaporimeter is a scientific instrument used for measuring the rate of water evaporation from a wet surface to the atmosphere. Atmometers are mainly used by farmers and growers to measure evapotranspiration (ET) rates of crops at any field location.[1] Evapotranspiration is a measure of all of the water that evaporates from land surfaces plus the water that transpires from plant surfaces. Based on the amount of water that does evaporate and transpire, the user can water crops correspondingly, which results in less water use and possibly increased crop yields. Companies that currently sell atmometers include C&M Meteorological Supply and Calsense.



1.Designed sealing systems, corrosion resistance

2.High evaporation efficiency, high recovery rate

3.Easy assembly and disassembly, convenient operation, easy maintenance

4.The stainless steel chassis, column, spindle, aluminium casting, attractive appearance, corrosion resistance.

5.Intelligent temp control, sink lift

6.AC induction motor stepless, brushless, no spark, long life


Use and maintenance

An atmometer is fairly easy to install and use. It is usually mounted on a wooden post about 40 in (1,000 mm)s above the ground in an area representative of the weather and field conditions. The plate of the atmometer should be placed in direct sunlight so the evaporation rates are not affected. It should not be placed near tall trees or buildings, as they can affect the amount of exposure that the atmometer has to environmental factors, which affect evapotranspiration rates. To measure the amount of water that has evaporated, calculate the change in water level on the gauge by subtracting the final water level from the initial water level.

An atmometer is also fairly easy to maintain. Salts can accumulate in the ceramic plate, so only distilled water should be poured into the reservoir to prevent the accumulation of these salts. Any salts that do accumulate can affect evapotranspiration rates, so it is best regularly check the ceramic plate. During the winter, freezing can cause damage and malfunctions to the atmometer, so it should be placed indoors to prevent any harm. Dust and other particles can build up in the canvas cover, so it should be cleaned about twice a month. Spikes placed on the atmometer prevent any birds or other animals from interfering with its performance. The most accurate and consistent results are produced by reading the gauge around the same time each day, preferably early in the morning (8:00 A.M.)


Advantages (compared to weather stations)

In a 2003 study conducted on the Central Coast of California, the performance of atmometers was compared with that of the more expensive weather stations. Atmometers were placed adjacent to seven weather stations around the area and weekly values were recorded for each method. The results indicated that the atmometers and weather stations yielded very similar results, both producing comparable evapotranspiration (ET) readings. Under conditions of lower evapotranspiration, the atmometers produced slightly lower ET values than those of the weather stations. Studies conducted by Colorado State University and the United States Department of Agriculture in Fort Collins produced similar results. The atmometers produced evapotranspiration values that were very close to the data calculated from weather stations. These studies show that atmometers are especially useful for areas that do not have access to nearby weather stations and/or evapotranspiration data.

Low cost

Easy operation


No computer or power required

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