U-shaped pressure gauge

A U-shaped pressure gauge, also known as a U-tube pressure gauge, is a liquid column pressure gauge. The method of measuring positive pressure, differential pressure, and vacuum degree by balancing the measured pressure with the static pressure generated by a liquid column at a certain height according to the principles of fluid statics.

Due to its simple structure, durability, low cost, and long service life, U-shaped pressure gauges can be permanently used without external damage. They are easy to read and have high measurement accuracy within the range of 0.1 MPa. They can also flexibly measure the positive pressure, differential pressure, and vacuum degree of different media by injecting different working fluids Therefore, it is widely used in various departments of industrial and mining enterprises and research institutes.

The U-shaped tube of the U-shaped pressure gauge provided by Chengchi Industrial Furnace is processed from organic glass, which has stable physical and chemical properties, good transparency, and is not easy to break. The mounting bracket is a flat plate made of high-quality wood, which can be flexibly drilled and equipped with hooks and other accessories according to the needs of on-site work.

The installation of the U-tube pressure gauge can be hung on the wall or placed on the workbench. Then, a rubber hose can be used to connect the measured medium interface to one or two pipe openings of the U-tube. During installation, attention should be paid to keeping it as vertical as possible to improve measurement accuracy. When reading, the eyes should be level with the liquid level, and the liquid level height should be read based on the tangent line at the top of the meniscus of the working fluid It is recommended to inject the working fluid at 1/2 of the scale. Commonly used working fluids for U-tube pressure gauges include water, mercury, alcohol, carbon tetrachloride, trifluoromethane, etc The measurement formula is: P=(ρ 1- ρ 2) Hg. In the formula, P is the pressure of the measured medium, which is the pressure in physics ρ 1 is the density of the working fluid. ρ 2 is the density of the measured medium. H is the height difference of the liquid injection. G is the local gravitational acceleration (m/s2), which is generally taken as 9.8 (m/s2).

During use, it should also be noted that the measured pressure must be less than or equal to the upper limit of the measurement range of the U-tube pressure gauge, and attention should be paid to keeping the inner wall of the U-tube pressure gauge and the working fluid clean and pure. When not in use, the rubber hose mouth should be tightly tied or the mouth should be blocked with gauze or cotton to maintain the measurement accuracy of the U-tube pressure gauge

The principle of using a U-shaped pressure gauge: Before the U-shaped pressure gauge is connected to the pressure measuring point, the liquid levels on both sides of the U-shaped glass tube are level at the zero mark. When one end of the U-shaped tube is connected to the pressure measuring point, the liquid level inside the U-shaped tube will change. If the liquid level on the side connected to the pressure measuring point drops, it indicates that the pressure at the pressure measuring point is positive pressure, otherwise it is negative pressure.

According to the magnitude of the measured pressure, the glass tube can be divided into two types: colored water and mercury, and the liquid level should be consistent with the zero point of the scale. It is mainly used for pressure, negative pressure, and differential pressure in coal gas, natural gas, chemical industry, coking, and machinery.