What factors affect the measurement accuracy of the Bourdon spring pressure gauge?

As a mechanical pressure measurement tool with simple structure and convenient use, the Bourdon spring pressure gauge is widely used in various industrial equipment and engineering systems. The measurement accuracy is directly related to the safety of system operation and the accuracy of control. The factors affecting its measurement accuracy involve many aspects, from structural design, manufacturing process, material properties, to the use environment and operation mode, every detail may cause deviation.

The geometric shape and size of the Bourdon tube itself are important factors affecting the accuracy of the pressure gauge. If the parameters such as the diameter, wall thickness, and radius of curvature of the Bourdon tube are not accurately controlled during the design and manufacturing process, it will cause its elastic deformation response after being compressed to be unstable, thereby affecting the linear movement of the pointer. The deformation process of the Bourdon tube depends on the elastic uniformity of its structure. Once there are slight irregularities or internal stress concentration, it may cause response hysteresis or nonlinear errors. The elastic recovery ability of the Bourdon tube will change with the use time, especially in a long-term high pressure or frequently fluctuating working environment, its elastic degradation will directly lead to inaccurate readings.

The choice of materials also plays a decisive role in the measurement accuracy of the pressure gauge. Bourdon tubes of different materials have different deformation capabilities when facing pressure loading. If the elastic modulus of the material is insufficient, plastic deformation may occur during repeated loading, and it cannot be restored to its original state, causing zero drift. In addition, the corrosion resistance of the material has a great influence on the accuracy. When working in a chemical medium environment, if the Bourdon tube material has poor corrosion resistance, the wall thickness will become thinner due to corrosion, and the elasticity will be weakened, thereby reducing the pressure response ability.

The stability of the manufacturing process is also critical. During the Bourdon tube forming process, if the welding is uneven, the cutting is not precise, or the internal stress generated during the processing is not effectively released, it may appear as structural instability in later use, resulting in the accumulation of measurement errors. Minor mechanical errors such as the meshing accuracy, friction coefficient, and matching clearance between the pointer and the gear transmission mechanism will also be transmitted to the display system, causing the pointer to respond lag, jitter, or fail to indicate accurately.

The environmental conditions during the use of the pressure gauge are also an important factor causing errors. Temperature changes will cause the Bourdon tube material to expand and contract, thereby affecting its strain amplitude. Especially in an environment with frequent alternation of high and low temperatures, fluctuations in material properties may further expand the error range. At the same time, high humidity or dusty environment may affect the operation of the gear system, causing jamming or pointer lag. Strong mechanical vibrations can also cause looseness or fatigue of structural parts, resulting in irregular errors.