U-tube pressure gauge use and installation
U-tube pressure gauges are liquid column pressure gauges. According to the hydrostatic principle, the positive pressure, differential pressure and vacuum are measured by the static pressure generated by the liquid column at a certain height to measure the pressure. Because of its simple structure, durability, low price, long service life, no external force. The damage can be used permanently, the reading is convenient, and the measurement accuracy is relatively high in the range of 0.1 MPa, and the positive pressure, the differential pressure and the vacuum degree of different media can be flexibly measured by injecting different working fluids. Therefore, it is widely used. Used in industrial and mining enterprises and research institutes.
The U-tube of U-tube pressure gauge is made of high-boron glass. Its physical and chemical properties are stable and transparent, and it is not easy to be broken. The mounting frame is made of high-quality wood. It can be flexibly according to the needs of field work. Drill and install hooks and other accessories.
The installation of the U-tube pressure gauge can be hung on the wall and placed on the workbench. Then connect the measured medium interface with one or two nozzles of the U-shaped tube with a rubber soft hose. The installation should be kept as vertical as possible. This can improve the measurement accuracy. When reading, the eyes should be flush with the liquid level, and the liquid level should be read according to the top tangent of the working liquid meniscus.
The working fluid injection amount is 1/2 of the scale scale. The commonly used U-tube pressure gauge working fluids are: water, mercury, alcohol, carbon tetrachloride, tribromomethane, etc. The measurement formula is: P=(Ï1 -Ï2)hg. Where: P is the pressure of the measured medium, that is, the pressure in physics. Ï1 is the density of the working fluid. Ρ2 is the density of the measured medium. h is the height difference of the liquid injection. g is the local gravity acceleration (m/s2) and is generally 9.8 (m/s2).
In use, it should also be noted that the measured pressure must be less than or equal to the upper limit of the measuring range of the U-tube pressure gauge, and pay attention to keep the inner wall of the U-tube pressure gauge tube and the working fluid clean and pure. When not in use, the rubber soft rubber nozzle should be used. Tighten or plug the nozzle with gauze or cotton to maintain the measurement accuracy of the U-tube pressure gauge.
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