How to choose a pressure gauge. The spring tube of a general pressure gauge is a tubular spring with a certain cross-sectional shape (usually two kinds of flat circles and approximately ellipses), which are folded into a "C" shape and can meet certain elastic requests. If the spring tube is too small, it will affect the accuracy level of the pressure gauge. .The indication value of the pressure gauge exceeds the allowable error, you should adjust the indication adjustment screw of the gauge. If the gauge has no indication adjustment screw, the gauge can only be judged as unqualified. . The number and symbol of the dial of the pressure gauge should be completely understood. The dial index scale should be evenly distributed, and the center angle of the package should be generally. The pointer of the pressure gauge should extend into all the index lines, and the width of the instigated end of the pointer should not be greater than the minimum index interval. The distance between the pointer and the plane of the index plate should be within the range of ~ mm (the mm outside diameter of the case) (including mm), and the distance between the pointer and the plane of the index plate should be within the range of ~ mm. .For pressure gauges with stop pins, the pointer should be close to the stop pins when there is no pressure or vacuum, and the "reduced grid" must not exceed the specified allowable error. .The pressure gauge case should be able to protect the internal parts from being contaminated. The pressure gauge should be equipped with a safety hole, and the safety hole should have a dustproof device. .Digital pressure gauge. It depends on the rationality of the overall structure, the selected materials, the aging process of electronic components, long-term firmness, etc. Installation of the pressure gauge. The installation position of the pressure gauge should meet the requirements of the installation status. The dial should not be placed horizontally. The height of the installation position should be easy for the staff to observe. . The distance between the installation position of the pressure gauge and the pressure measuring point should be as short as possible, to ensure a good seal, and no leakage phenomenon can emerge. . There should be a buffer at the front of the installed pressure gauge; for ease of inspection, a shut-off valve should be installed under the instrument; when the medium is dirty or there is pulse pressure, filters, buffers and stabilized gas can be used. The pressure gauge should be regularly repaired and maintained. After a period of use and pressure, the pressure gauge movement will inevitably show some deformation and wear, and the pressure gauge will produce various errors and failures. In order to ensure its original accuracy without distorting the transmission of the value, it should be replaced in time to ensure that the abetment is correct, safe and reliable. .The pressure gauge should be cleaned regularly. Because the inside of the pressure gauge is not clean, it will increase the wear of various mechanical parts, thereby affecting its normal work, and will seriously cause the pressure gauge to malfunction and be scrapped. .The pressure gauge installed at the pressure measurement site, according to JJG- regulations, its verification period generally does not exceed half a year. .The medium of the pressure measurement site fluctuates greatly, is frequently used, and the accuracy is high, and the safety factors are more strict, the verification period can be shortened according to the specific situation.
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