(1) Temperature error. This refers to the change of the length of the scale and the density of the working fluid due to the change of ambient temperature, and the former can be ignored in general, and the latter should be appropriately corrected. For example, when water is changed from 10°C to 20°C, its density changes from 999. 8kg/m^3 is reduced to 999.8kg/m^3, and the relative change is 0.15%.
(2) Installation errors. When installing, make sure that the U-shaped tube is in a stern plumb position, and the two tubes should be in the zero position of the ruler under the effect of no pressure, otherwise there will be installation errors. For example, when the U-tube is tilted by 5°, the liquid level height difference is about 0.38% off the actual value.
(3) Gravitational acceleration error. As can be seen from the principle, gravitational acceleration is also one of the factors affecting the accuracy of measurement. When the pressure measurement requirements are high, the local gravitational acceleration should be accurately measured, and the correction should also be made in time when the address is changed.
(4) Error of pressure transfer medium. In practical application, the general pressure transfer medium is the medium of the measured pressure. When the pressure transfer medium is gas, if the height difference between the two impulse pipes connected with the two U-shaped pipes is large, and the density of the gas is large, it is necessary to consider the pressure effect of the pressure transfer medium in the impulse pipe on the working liquid; If the temperature changes greatly, the influence of the density of the pressure transfer medium with the change of density should also be considered. When the pressure transfer medium is liquid, in addition to the above factors, it is necessary to consider the above factors. It should also be noted that the pressure transfer medium and working fluid cannot produce dissolution and chemical reactions.
(5) Wrong readings. Reading errors are mainly caused by the capillary effect of the working fluid in the U-tube. Because of the capillary phenomenon. The liquid column inside the tube can produce additional rises or falls. Its size is related to factors such as the variety of working fluid, temperature and inner diameter of the U-shaped tube. When the inner diameter of the tube is greater than or equal to 10mm, the * big ** error of the reading of the U-shaped bamboo single tube is generally lmm. This error does not vary with the height of the liquid column and is a system error that can be corrected. There is an error in the measurement of the U-shaped tube pressure gauge, and the error is inevitable, and the error can only be reduced.
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