Pressure gauge Hydraulic

Hydraulic pressure gauges are devices for measuring fluid pressure. They are widely used in various fields, including medicine, chemistry, aviation and mechanical engineering. In this article we will look at some features of hydraulic pressure gauges, their types and applications.

Liquid and hydraulic pressure gauges

Hydraulic pressure gauges are used to measure pressure levels in open flows of liquid or gas. The operating principle of such devices is based on the fact that liquid pressure exerts a force on the sensitive element of the pressure gauge. The measured force is transmitted to the needle or scale of the device, where the pressure level is displayed.

Technical characteristics of pressure gauges

There are several types of liquid pressure gauges, which differ in their operating principle, installation method and measurement range.

The following types of liquid pressure gauges exist: - mechanical - gas-dynamic - piezoelectric (piezotechnics) - electronic liquid

The principle of operation of a liquid mechanical pressure gauge is that the measuring liquid (alcohol, water, kerosene) passes through the measuring tube, after which it enters the liquid located in the receiving tube. The force arising from the fact that the liquid presses on the surface of the liquid in the receiving tube is transmitted to the measuring mechanism, which records this force.

Liquid mechanical pressure gauge has many advantages, such as ease of use, low cost and high measurement accuracy. However, it does not measure high pressure, and its readings can be affected by the temperature and density of liquids. In addition, such a pressure gauge is not very convenient for installation in hard-to-reach places.

A gas dynamic pressure gauge works on a different principle. The mechanism measures the speed of movement of gas or steam, which is proportional to the pressure in the system. This type of pressure gauges is more accurate than liquid pressure gauges because it does not depend on the density, viscosity and heat capacity of the liquid. It can measure pressure up to high levels, and can be installed almost anywhere in the system. However, such pressure gauges require knowledge of the correct parameters for calibration.

A piezoelectric pressure gauge (also known as piezometers) is a relatively new type of device for measuring pressure, but has already found application in various high-tech industries. The principle of operation of a piezometer is based on the piezoresistive effect, when the resistance changes when the material is deformed. A measuring cylinder filled with a special liquid is subjected to pressure by deforming the piezoelectric material located in the sensor, resulting in a voltage difference that reflects the current pressure in the system. Such devices allow you to measure pressure levels both statically and dynamically. At the same time, the measurement accuracy of a piezomanometer is much higher than that of mechanical pressure gauges, and due to the compactness of the device, it can be easily installed by hanging it on easily accessible surfaces, for example, on a wall.

Electric liquid gauges have also become popular recently due to their small size and measurement accuracy. These pressure gauges are designed to measure low levels of differential pressure. Their accuracy is estimated at 0.01%, making them indispensable in scientific work, industry, manufacturing and medicine. The device can be used in conjunction with