We choose devices for determination of air humidity
We choose devices for determination of air humidity
To measure the moisture level in an apartment orprivate house, you need special equipment. Today, to purchase a device that will show the relative or absolute humidity of air, does not make much trouble, but how to make the right choice?
What humidity do we measure?
Humidity is not temperature or time. When it is measured, there are some nuances. Therefore, before going to the store for the desired device, the topic should be studied a little. First you need to understand the basic concepts. Humidity of air is absolute and relative. Absolute is the density of water vapor in the air. At different temperatures, this value will be different. But the relative humidity of the air - this is exactly what is constantly being said in the weather forecast and weather reports. In simple terms, this value shows how much moisture does not have enough air until the moment when its condensation begins. It is the device for determining the relative humidity of air and is needed for a children's room, office or other household use.Hygrometers
An instrument measuring the humidity of air is calledhygrometer. Today in shops you can often find electronic hygrometers of various modifications. For a children's room and a simple systematic control of humidity in the house, such an instrument can be quite sufficient, especially since the price is acceptable. However, the high accuracy of the indications of such a hygrometer do not differ. Sometimes they can give an error within 20%. A mechanical hygrometer will cost more than an electronic hygrometer, but it will also work more accurately. The device is a scale with an arrow. There are hair and film modifications of such a device. In the first, a long female hair, connected to the meter, responds to changes in air humidity. In the film hygrometer, the role of the measuring element is played by a special thin film. However, it should be borne in mind that both hygrometers will give fairly accurate information at low temperatures, but in the heat their readings may be distorted.Psychrometer
The most accurate instrument for determiningrelative humidity at different temperatures is a psychrometer. The basis of his work is the difference between the temperature on the two scales of the thermometer - dry and wet. However, to get the result, you will have to make some efforts: moisten the cloth with water, place in the device and wait for a while, and then calculate the answer on a special table. However, if you are looking for really reliable data on humidity and fluctuations of 15-20% you are not satisfied, buy it psychrometer with two scales. He will not let you down.
