Aspiration Psychrometer

An aspiration psychrometer (P.A.) is an instrument that is used to measure the humidity of the air in the environment by measuring the temperature of two thermometers, one located inside the device and the other outside. The device is equipped with a fan that ensures air movement near the surface of both thermometers at a constant speed, which allows measurements to be taken at any wind speed.

The operating principle of a psychrometric thermometer is based on the temperature difference between a dry and wet thermometer. As air passes through the instrument, it cools the dry bulb bulb and its temperature decreases. At the same time, the wet bulb remains relatively warm because it is in contact with a damp surface. The difference between dry and wet bulb temperatures is proportional to air humidity.

Aspiration psychrometers are widely used in meteorology, agriculture, industry and other industries where it is necessary to control air humidity. They allow you to quickly and accurately measure air humidity over a wide range of temperatures and wind speeds, making them indispensable tools for research and environmental monitoring.

A device for measuring air humidity and air temperature, an aspiration psychrometer (P), equipped with a fan. The psychrometric method of measuring humid air is the simplest and most widespread. The method is based on the difference between dry and wet thermometer readings. To measure humidity, use a dry thermometer, which measures only the temperature of the surrounding air, and a wet thermometer, or psychrometer, which, in addition to temperature, shows the difference between the true air humidity and the temperature of the thermometer. This difference is called the degree of dryness. The coefficient of the temperature characteristic of a psychrometer is taken as the difference between the dry-bulb and wet-bulb readings and the division of the pressure scale on the dial.

The process of determining humidity begins with the installation of two thermometers - dry and wet, which are installed before starting operation of the device. It involves the calculation of two values ​​- absolute humidity and relative humidity. When using this instrument, environmental conditions such as wind speed, air temperature and humidity must be taken into account to obtain correct readings. Aspiration psychrometers are indispensable for carrying out measurements in laboratory