Geoves

Description

MAIN FEATURES

EVAS is a sensor that measures the water evaporation caused by the effect of surface temperature, solar radiation and wind. This measure is carried out in accordance with the WMO (World Meteorological Organization guidelines) using a collection Class A pan filled with water and laid on a special open-frame wooden platform. Inside the tank it’s immersed a sensor with high precision that detects the variations of water level providing in this way the measurement of water evaporation.

The whole evaporimetric measurement system consists of the following parts:

• AISI 304 Stainless steel pan with reinforced bottom with triple casing that keeps the bath raised from the base; the tank is equipped with filler neck closure plug for the drain and overflow hole which defines the maximum permissible level in the pan (200mm)
• Impregnated larch platform, treated with protective coatings to make the basement completely waterproof. The deck is constituted by a double weft of strips of thickness from 6cm to ensure a natural ventilation of the steel bath
• Protection tube for housing of immersion hydrometer that also serves as the well of calm to avoid any transients caused by water ripples;
• High accuracy piezometric sensor made with a pressure transducer relative (with vented tube for atmospheric pressure compensation) temperature compensated. The sensor is available with analog output 4...20mA with two-wire connection (other outputs on request). The hydrometer used has a content consumption and the possibility of auto-off: in this way the sensor is ideal for low-power systems powered by solar panels.

ADVANTAGES

• Very high precision
• Integrated protection against overvoltage and reverse polarity 
• Protection class: IP 68
• Compact and robust housing structure 
• Measurement stability with temperature compensation