hygrometer What we learn when you want to control the level of humidity in the room or in the air.This need arises in hospitals and museums, libraries and warehouses.Often, you can find an offer to buy a home hygrometer.It has been proved that the humidity in the room has a huge impact on the well-being and the level of the occupants of the people in it.
To determine this parameter, which determines the degree of comfort microclimate, modern industry has established production of various devices for determining the humidity of the air.
hygrometer - an instrument designed to measure the amount of moisture in the air.Its design can be based on very different principles of action.The most common hygrometers operate on the basis of weight, a hair or a membrane sensor.What is a hygrometer absolute?Another of his name - the weight.This type of devices that measure the moisture is a structure of the system of U-shaped tubes.They are filled with hygroscopic substance which is capable of absorbing moisture from the surrounding air.By passing through the system by pumping a certain amount of air, which is tested for the amount of moisture determined by weight difference before and after the measurement.Measure the volume of air passed through the system, determine its absolute humidity.
measured by weight method for determining the moisture complex, require laboratory conditions, consuming a lot of time.They are rarely used, despite the high accuracy of the analysis.
Hair-hygrometer works on the basis of the physical properties of low-fat human hair.By varying the length at different levels of humidity of the ambient air, it becomes a central sensor device which determines the relative humidity in the range of 30 - 100%.The Film hygrometer used organic film, it exhibits properties of expanding with increasing humidity and contract during its decline.
That devices with a capillary membrane structure and provide an answer to the question, what is a hygrometer for winter conditions.
As hairline and foil hygrometers over time change their properties.Given this fact should periodically compare their readings with the readings of hygrometer, which more precisely defines the humidity.
more sophisticated devices are electrolytic and ceramic hygrometers.In the first level of humidity is determined by the change in the resistance of the electrolyte, which is applied a layer of hygroscopic lithium chloride on an electrically insulating plate.With all the advantages of this type of hygrometers celebrated its dependence on temperature readings.The ceramic instruments is also the basis for measuring the change in humidity resistance on measurement of the difference.As a sensor of this unit is used solid porous ceramic material (the composition is a mixture of clay, kaolin, silica and oxides of some metals).
What is condensation hygrometer try to understand the basis of its design.It consists of a cooled metal mirrors, device locking dew point (condensation), thermometer, determines the dew point temperature, and a cooling device.Slightly modified form measures the dew point electrolytic device heating.This process occurs over a saturated salt solution (usually lithium chloride).
can be seen that when using different types of hygrometers is measured three different sizes, though interrelated.This is an absolute, relative humidity and dew point.To move from one value to one another, you must take a number of simple recalculations.
