To maintain a healthy environment in homes and need to control the level of workplaces humidity. In today's review we will talk about how to buy a room hygrometer with the real needs. There is information about the simple low-cost designs and cutting-edge models with advanced features. DIY enthusiasts the relevant section can familiarize with steps to independent manufacturing quality measuring instrument.
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- 1 What does the measurement of air humidity
- 2 The operating principle of the hygrometer: an overview of the methods of measurement to preliminary estimates
- 3 Modern hygrometer: what it is
- 4 How to use a hygrometer: correct operation of the mechanical and electronic measuring instruments
- 5 How to buy a room hygrometer without errors: the wording of individual requirements, the proper study of real
- 6 Where to buy a hygrometer at a reasonable price: a review of the current state of the market
- 7 Learning from reviews of the owners when choosing a room hygrometer
- 8 How to make a functional inexpensive hygrometer with their hands
- 9 For more information and helpful advice
What does the measurement of air humidity
Excessive amounts of moisture in conjunction with heat creates favorable conditions for the vital activity of bacteria, fungi and mold. In such an environment are activated corrosion processesThat can destroy metal products, incapacitate expensive electronic gadgets. Differences of said parameters provoke the appearance of cracks in the woodworkdeformations window and door blocks. Dryness impairs the functionality of adhesive joints.
Of special note is the direct damage that can be caused to health. In summer, at high humidity in a room fan application /air conditioning can cause colds. In winter, with a lack of moisture in the freezing air drained mucous membranes. This disrupts the operation of protective systems of the human body. More trouble is the deterioration of the appearance and the physiological condition of the hair, skin.
Listed here are a small part of the real problems. But this is enough to understand the need for precise control of critical parameters. What measures hygrometer? The moisture level. For completeness assessment should also know the value of the temperature. Follow the steps below on how to use a combination of instruments. However, the main theme of the article is to examine the content checking technology water in room atmosphere.
Note! The "normal" range of relative humidity - 40 to 60%. However, this definition specifically quoted. Sometimes you have to go out of range. The water content of a few increases to accelerate the treatment of certain diseases, the proper content of tropical plants.
The operating principle of the hygrometer: an overview of the methods of measurement to preliminary estimates
To solve this problem, you can use different methods. The most obvious is the transmission of a certain amount of air through the desiccant material. According to the change in weight is not difficult to determine how much water is contained in a unit volume. Not hard to figure out how to work this type of hygrometer. It is much more difficult to automate the work operations mentioned.
This method is based on the change of "the probe" length with an increase / decrease in humidity. Instead of hair can be applied with weighting cord, fabric strip, a film of an organic material, another suitable device. It is essential that such a detail to maintain performance and integrity for a long time.
It is possible to detect formation of dew on the mirrorAnd then make a recalculation based on the known parameters:
| the room temperature, ° C | The temperature level in ° C, which corresponds to a certain relative humidity% | ||||
| 30 | 40 | 60 | 70 | 90 | |
| 30 | 10,5 | 14,9 | 18,4 | 23,9 | 28,2 |
| 25 | 6,2 | 10,5 | 16,7 | 19,1 | 23,2 |
| 15 | -2,2 | 1,5 | 7,3 | 9,6 | 13,4 |
This embodiment requires an additional device which slowly lowers the reference plate temperature to the required level. It is understood that in addition to the high complexity of the equipment will have to put up with the long duration of the measurement process.
It is possible to measure the electrical resistance of the ceramic (or other durable porous material), specifically chosen electrolyte. With the use of specialized sensors set absolute humidity. According to the standard algorithm calculates relative value. You will need to know the temperature. Technologies discussed in this paragraph are used in modern electronic thermometers hygrometers.
This room hygrometer performs its functions as follows. Dry alcohol thermometer (1) is used in the normal mode. By increasing the liquid temperature in the enlarged lower portion (7) expands and rises inside the glass tube. Its position on the scale (3) determines the temperature in the room. Another thermometer (3) is lowered into the filter (6), which is wetted with distilled water from the reservoir (5).
The difference in readings define the actual concentration of water in the atmosphere of the room by using psychrometric table. Thus, if the dry thermometer 25 ° C, and the difference of 3 ° C, then the relative humidity - 75%.
Modern hygrometer: what it is
Nowadays functional electronic hygrometer can be bought for 300 ÷ 500 rubles. Detail the situation on the market is considered in a separate section of the article. But it is clear that will not need a significant investment for on-line measurement of the relative humidity level.
Electronics compared with psychometric instrument has several important advantages:
- Such a device without additional manipulations shows the measurement result.
- Close indicator is convenient for reading. can be used, if necessary, the built-in backlight.
- Economical energy consumption implies the need to replace the elements 1 ÷ 6 times every 7 months and less.
- Information in electronic form is convenient to handle, store and study. It can be used to control air humidifiers, air conditioning, Other equipment
- Current models are fitted with special sensors that allow you to perform additional measurements.
Equipment in this category is capable of measuring the level of humidity and temperature, atmospheric pressure, wind speed and direction. Probe and special devices installed in several places on the street and inside the property. The relevant performance used wireless links.
How to use a hygrometer: correct operation of the mechanical and electronic measuring instruments
Simplicity of design elements allows the correct conclusion that the mechanical hygrometer can be bought cheaply. In this case it involves not only a reasonable cost but high measurement accuracy. It is explained by the small scale division (0,2 ° C) standard scale. Alcohol-containing mixture is completely safe unlike mercury which is used in medical thermometers. These devices do not need electrical power to perform its functions.
However, a full analysis should be mentioned about the shortcomings and limitations. You should know how to use the psychrometer correctly:
- Such hygrometers are designed to perform measurements in a limited temperature range (-10 ° C and + 40 ° C).
- The level of + 23 ° C or lower can only determine the relative humidity above 40%.
- When the carriage is necessary to comply with the vertical position of the workpiece.
- For good accuracy to exclude movement of air streams with velocity greater than 1 m per second.
Such devices can be used in an extended range of temperatures (up to + 60 ° C in some models). We do not need special precautions when moving during operation. The measurement results are displayed in the online mode without conversions, and other embarrassing acts. The user does not have to regularly replenish the distilled liquid.
Among the shortcomings should be noted:
- the need to replace batteries;
- relatively high cost;
- greater measurement error in household models (2 ÷ 5%).
How to buy a room hygrometer without errors: the wording of individual requirements, the proper study of real
In some sections of the article discussed in detail, where to buy a hygrometer bedroom, how to make a valid instrument with his own hands. But in any case, you first need to prepare a list of their own preferences.
Unlikely to decorate the interior of a luxurious living utilitarian view psychrometric meter. Electronic devices are available in a wide range, so the choice of the optimal variant will not be difficult.
The indoor thermometer hygrometer except the moisture level displays temperature. Should carefully consider the benefits of equipping additional external sensors. In practice it may come in handy saving the measurement results in the memory, and other advanced features.
Where to buy a hygrometer at a reasonable price: a review of the current state of the market
| Brand / model | price, rub. | device type, especially notes |
 |
280÷390 |
|
 |
880÷960 |
|
 |
500÷700 |
|
 |
1400÷1700 |
|
 |
1700÷2800 |
|
 |
290÷620 | Psychrometric room hygrometer. |
 |
420÷780 |
|
Where to buy a hygrometer for the apartment can be quickly identified using a conventional Internet search. Given the small size and weight of the clear low cost delivery.
Learning from reviews of the owners when choosing a room hygrometer
verlar, Moscow Korolev: Advantages: It is useful to know the temperature and humidity of the room.
Disadvantages: Indications differ. They need to be adjusted a thin screwdriver - back there for that two holes. To build on a proven instrument and calibrate it ...
More on Otzovik: http://otzovik.com/review_4342440.html.
IsaEva, Kremenchug: Advantages: design will fit into any interior, simplicity, functionality, a large readable font. Hygrometer HTC 1 is compact, looks very modern, large numbers show the temperature and humidity, the sake of what it actually buys. Smaller display time. It is possible to install on a table and mount for placement on the wall.
Disadvantages: It is intuitively understand the "hurriedly" settings difficult.
More on Otzovik: http://otzovik.com/review_364140.html.
Kelenavic, St. Petersburg: Advantages: Design; ease of use, large numbers; manufacturer - Great Britain. Device shows the humidity and air temperature in the room. In my opinion quite accurately. There it is another fun feature: when the temperature and humidity in the room is comfortable for the child, the monitor shows a smiling face. When allowed - without a smile, and when it is not comfortable, face crying.
Disadvantages: No backlight; no clock; It does not measure negative temperatures. The change in the measured parameters reacts with a delay of 1-2 minutes.
More on Otzovik: http://otzovik.com/review_4358711.html.
Slashxxl, Moscow, room hygrometer Atomic / W239009: Advantages: Excellent, high-quality device. For comparison, I bought 5 hytherographs different manufacturers. This was the best. In the first place it is more accurate in it convenient large dial with big numbers, its design is more attractive, with more accurate readings comparable with published data.
Disadvantages: None.
More on Otzovik: http://otzovik.com/review_603458.html.
How to make a functional inexpensive hygrometer with their hands
These drawings help make high-quality home-made quickly, with minimal effort. Will have to buy two simple alcohol thermometer. Also it is necessary to prepare a cotton cloth and distilled water. Further design scheme collected by standard psychometric instrument.
For more information and helpful advice
When purchasing a hygrometer room price should be seen in conjunction with other important factors:
- appearance;
- ease of installation;
- easy operation.
It should be noted that in the domestic environment, an error within 5% is acceptable. Given the reasonable price level is necessary to pay attention to the multi-function instrumentation. Simultaneously with the measurement of the parameters necessary to consider a method of correction. It is not excluded that will have to purchase a dedicated device - humidifier.
Related article:
Humidifier: ranking of the best models of 2017-2018.In this publication you will find a detailed overview of the ultrasonic, steam models, the air sinks and climate systems, tips and expert advice.
In comments to the article, leave your questions. Here you can also share tips, to express their own opinions about consumer characteristics of room hygrometers.
In this video - step by step instructions for creating your own hands Meter hair type:
