Pressure gauge what are the general technical requirements?

A lot of people in the use of pressure gauge, but some technical requirements for pressure gauge is not very understanding, this instrument will tell you the: A, shape structure A. Pressure gauges shall be assembled firmly, no loose phenomenon; B。 Visible part of the pressure gauge should have no obvious flaws, scratches, fittings should be no burr and damage; C。 Measurement of oxygen, hydrogen and acetylene and other combustible ( Fuel) Gas pressure gauge, should be on the dial labelled with the name of the measured medium and the color of the measured medium warning tag. Warning tag is in the color, should on the dial gauge name below to draw a horizontal line, said the color of the horizontal line is special instructions, such as: the oxygen color is blue, hydrogen is green, and so on. In addition, oxygen pressure gauge must be marked in red on dial & other; Ban oil & throughout; Or marked with the specification of oil marks. D。 Double needle double tube single pipe pressure gauge with two joints should be coated with two Pointers of the same color paint. Second, the marks pressure gauge shall be as follows: product name, unit of measurement and digital, factory number, production date, measuring range, accuracy grade, manufacturer name or trademark, the symbol and serial number licence for manufacturing measuring instruments, etc. Three, indicating device, A. Pressure gauge on the surface of colorless transparent glass, can not have get in the way of reading defect or damage; B。 Pressure gauge index plate should be smooth level off, the digital and the logo should be clear; C。 Pressure gauge pointer indicating end should be able to cover the shortest 1/3 to 2/3 the length of the dividing line, take set pointer needle gauge set the pointer indicating end should be able to cover the main dividing line length of 1/4 ~ 2/4; D。 Pressure gauge pointer indicating the width should be no greater than the width of the dividing line; E. With zero device of pressure gauge, its zero device should be flexible and reliable. Above the technical requirements of the hope can help to you!