Humidity is one of the main environmental parameters that affect the storage and processing of various types of raw materials and finished products. Therefore, measuring air humidity is an indispensable process in production. Currently, many doctors recommend monitoring the degree of humidity in the air and at home, as the humidity readings also affect the well-being of a person, especially young children. It is recommended to maintain this parameter indoors at a level of 50-70%. To determine the air humidity use a special device - a hygrometer or, as it is also called, a hygrometer.
Hygrometers are of various types, which differ in the principle of action. Distinguish between absolute, hair hygrometers and psychrometric hygrometers. There are also devices whose operation is based on determining
the dew point. The main and most commonly used is a psychrometric hygrometer. It allows you to measure not only the level of humidity, but also the temperature. A psychrometric hygrometer allows you to determine the
relative humidity in percent. It represents the base on which there is a scale with divisions and two capillaries are fixed. The base of one of the capillaries is wrapped with a cloth wick, the end of which is lowered into a glass flask. Before determining the moisture content, water is poured into the flask. The hygrometer scale is calibrated in degrees Celsius. The measurement is based on the difference in air temperatures indicated by the “dry” and “wet” capillaries. Each psychrometric hygrometer is also equipped with a table, using which the relative humidity of the air is determined from the difference in temperature readings.
To measure air humidity, a psychrometric
hygrometer should be installed in a vertical position at eye level in such a place that its readings are most accurate, that is, so that there are no sources of heat or vibrating parts nearby. Pour water into the flask. It is necessary to ensure that the wick does not come into contact with the walls of the flask. Then you need to wait until the temperature difference is established, it will take more than thirty minutes. When using a hygrometer, you must be careful, because the capillaries are made of thin glass and can break.
The most commonly used psychrometric hygrometer is VIT-2. Its body is made of plastic. And as a liquid inside the capillaries is toluene. The humidity measurement range is 20 - 90%, and the temperature is 20 - 40
0 . This hygrometer has a low cost, ease of measurement, wide coverage of air humidity values - this determines its prevalence. To measure humidity at lower temperatures, a VIT-1 hygrometer is used. It allows determination in the temperature range from 5 to 25
0 C.
A hygrometer is a necessary device not only in production, but also in residential premises, since air humidity should be within normal limits, because excessive dryness of the air adversely affects the condition of the mucous membranes, skin, and also increases the level of dust, which can cause severe allergic reactions. reactions.