Useful tips: Why is it best to use a Bourdon tube pressure gauge within the range of 1/3 to 2/3 of its total scale?
Thread Content
This post was last edited by lilyqiu on 2019-5-14 21:42. When selecting instruments for use, the operating range of a pressure gauge is generally between 1/3 and 2/3 of its full scale. Do you know why? Structure of spring pressure gauges: The measuring element of a Bourdon tube pressure gauge is an elastic element bent into an arc shape, which is a hollow Bourdon tube with a flat circular or oval cross-section. One end of the Bourdon tube is fixed and connected to the medium under test via a connector ； The other end is closed, serving as the free end. The free end is connected to the connecting rod via a sector gear, which in turn meshes with the gear at the center of the mechanism to form a transmission amplification device. When measuring changes in medium pressure, a Bourdon tube pressure gauge utilizes the elastic deformation of the hollow Bourdon tube; the mechanical deformation caused by pressure is then transmitted to the linkage mechanism through a conversion mechanism built into the gauge’s movement, and the gear mechanism drives the pointer to rotate, thereby indicating the pressure. The schematic diagram of the pressure gauge structure is as follows: The characteristics of the elastic element in a Bourdon tube pressure gauge determine its optimal range of use. When the measured pressure is greater than 1/3 of the gauge’s range, it exhibits the best linearity and repeatability, with the lowest relative error and highest accuracy ； If used for an extended period at more than 2/3 of its range, the elastic element will experience a reduction in its elasticity, which leads to zero drift and changes in the instrument’s range. This accelerates the aging of the element and reduces its service life. For the above reasons, when selecting a gauge for design purposes, its operating range is generally set at 1/3 to 2/3 of its full scale. This article is original; please indicate the source when reproducing it.
“The operating range of a pressure gauge is generally between 1/3 and 2/3 of its range?” This only shows that the gauge is of poor quality and not functional; it doesn’t indicate anything else. A good instrument can be used within its range in any way one wants; no matter how it’s used, it still performs well and doesn’t break. A good instrument is like the tools I have – very useful and easy to handle. The rest is omitted: 100000000000000000000000 words :lol
This range of use is chosen to cope with pressure fluctuations.
Isn’t this article from the official account of this forum?:o