The choice of the spring pressure gauge should pay attention to what?

Bourdon tube type pressure gauge is mainly used for liquid, gas and steam pressure measurement, due to its wide measuring range, simple structure, strong and durable, easy to carry and use of safe, reliable, cheap, has been widely used. It is mainly composed of spring tube and transmission amplification mechanism, its working principle is elastic element after the compression deformation of the elastic reaction force and the measured pressure balance, on the basis of the deformation displacement of measuring element to determine the size of the measured pressure. When choosing pressure gauge, should fully consider the nature of the measured medium, such as temperature, corrosive, flammable and explosive, etc. , also want to consider installation environment conditions, such as temperature, vibration, humidity, altitude, etc. , the comprehensive situations to selecting type, specification. Pay special attention to the following points: (1) appearance: pressure gauge parts assembly should be firmly, no loose phenomenon, the new manufacturing gauge uniform coating should be bright and clean, no obvious phenomenon, peeling on the pressure gauge shall be equipped with security holes, security holes shall be dustproof device ( No escape by medium pressure gauge with the exception of off-balance sheet) , pressure gauge according to the measured medium is different, on the pressure gauge shall be stipulated by the color scale, and indicate the name of the special medium, oxygen table must also be marked in red & other; Ban oil & throughout; With the words. : (2) the logo on the dial should sign the following: manufacturing unit or trademarks, product names, units and Numbers, the symbol and serial number measuring instruments manufacturing license, vacuum due & other; - ” Number or & other; Negative & throughout; Words, accuracy grade, factory number. (3) reading part: table should be colorless transparent glass, should not have prevent defects and damage of readings and index plate should level off is smooth, the logo clear, pointer indicating end should be able to cover the shortest 1/3 to 2/3 the length of the dividing line, pointer indicating the width should not play with the width of the dividing line. (4) to zero: with pin gauge, in the absence of pressure or vacuum, pointer should be close to the stop pin, & other; Shrinkage, & throughout; Should not exceed the prescribed 2 times of permissible error absolute value.