What is a pressure gauge used for? How to read the measured value on it? Where to use this type of devices? If you can't answer at least one of these questions, check out our article and learn more about blood pressure measurements.
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What is a pressure gauge used for?
A manometer is used to measure the pressure of a liquid or gas, most often in a closed space. It is most often installed in home installations. Examples include:
- Central heating. The pressure gauge allows you to determine the water pressure in the pipes. If it is too low, it means that water needs to be added to the system. Too high may indicate problems with the tightness of the pipes.
- The pressure gauge can be connected directly to the furnace or heat pump to measure the pressure of the working fluid.
- It is a very popular measuring device for industry, especially in power hydraulics systems.
- Pressure gauges can also be found in any other place where the pressure of any gas or liquid should be measured.
The great popularity of pressure gauges is also due to their simple construction and universal use. It can be easily installed in any system. But how to read the desired value?
How to read the measured value on a pressure gauge?
Under the influence of the pressure of a liquid or gas in a closed tank, a small spring in the manometer is compressed, causing the pointer to rotate. The value is marked on the dial and is usually given in two units: atmospheres (bar) and inches of mercury (a measurement used in English-speaking countries). Just read the value indicated by the pressure gauge to know the pressure inside the system and take appropriate action.
Regular or logarithmic manometer - which one to use?
At high pressure dynamics, a regular pressure gauge will not be convenient. In such cases, logarithmic manometers are used. The logarithmic scale on the dial ensures better reading of both lower and higher values. The first half of the dial is occupied by values from zero to three atmospheres. The next quarter of the dial allows measurement of 3 to 5 atmospheres. The last one measures pressure up to 25 bar. In this way, the value for low pressure can be read very precisely, while the overall scale also covers high measurement values. This type of devices are perfect in industry, where the pressure in the press or actuator can increase dynamically during operation.
Types of threads - how to choose the right pressure gauge?
In hydraulics, inch dimensions still prevail. An example would be pressure gauge for central heating with a scale of 0-1.6 bar with a 1/2 inch thread , suitable for classic hydraulic systems. They are available for systems operating at higher pressures pressure gauges with a scale of 0-10 bar .
However, not all installations have to be made in the inch system. Metric systems are also becoming more and more common. In such a case, you should select an appropriate thread, for example a popular one M20x1.5 pressure gauge with a scale of e.g. 0-6 bar. A universal solution that works well in both home and production installations.