U type pressure gauge
U-type pressure gauge, also known as U-tube manometer, U-type pressure gauge belongs to the liquid column manometer. Static pressure with a certain height of liquid column measured pressure generated by the balance in accordance with the principle of hydrostatic method to measure positive pressure, differential pressure and vacuum.
Due to the simple U-shaped pressure gauge, rugged, low cost, long service life if no external damage can be permanent use, easy to read, and within the scope of their 0.1MPa measurement accuracy is relatively high, and the working fluid by injecting different and flexible measuring positive pressure, differential pressure and vacuum of different media. it is widely used in industrial and mining enterprises and scientific research institutes and departments.
ChengChi industrial furnaces provide U-shaped manometer U-tube is made of plexiglass processing, its sical and chemical stability, good transparency and less fragmentation, the mount is made of high quality wood processing flat, according to field work needed The above drilling and installation of flexible hooks and other accessories.
U-tube manometer is installed can be hung on the wall and placed on the table, and then soft rubber tube a measured medium interface or two U-shaped tube nozzle connection, the installation should pay attention to remain vertical as possible This can improve the measurement accuracy, the reading eye should be flush with the surface to the top surface of the working fluid meniscus tangent prevail read the liquid level. Working fluid injection amount to 1/2 of the scale marks for good, common U -tube manometer working fluid are: water, mercury, alcohol, carbon tetrachloride, bromoform and other measurement formula is:. P = (ρ1-ρ2) hg. Where: P is the pressure that is measured media pressure .ρ1 sics is the density of the working fluid. ρ2 is the density of the measured medium. h is the height difference between the fluid injection. g is the local acceleration due to gravity (m / s2) generally take 9.8 (m / s2).
Note also that the use of measured pressure must be less than or equal to the upper limit of the U-tube manometer measurement range, and to keep the U-tube manometer tube wall and the working fluid for cleaning pure, do not be soft rubber mouthpiece truss or blocked nozzle with gauze or cotton, in order to maintain the measurement accuracy of the U-tube manometer.
Use U-gauge principle: When there is no communication with the U-shaped manometer pressure measurement point before the liquid level within the U-shaped glass tube on both sides of the zero he se level scale. When one end of the U-tube pressure measurement point connectivity, the liquid inside the U-tube change. When communicating with the measurement points on one side of the liquid drop, indicating pressure gauge at the point of positive pressure, otherwise it is negative.
Depending on the size of the colored water and measure the pressure of two separable mercury within a glass tube, and the liquid level is consistent with the scale zero, mainly for gas, natural gas, chemicals, coke, mechanical pressure, negative pressure and differential pressure.
