Single pipe mercury manometer what technical requirements?

Pressure gauge has a lot of, the most common is the dial gauge, and the mercury manometer, mercury manometer should be how to use? What are the technical requirements? Said to you about below: 1, the glass tube should be straight, uniform diameter, wall clean, must not have bubbles, air wire, stone scratch defects affect the measurement. 2, mercury should be clean, in the glass tube moves can not have viscosity, residue and jumping phenomenon such as mercury, mercury should be convex at the top of the meniscus. 3, scale should be straight, mobile and flexible, scribed line should be clear, uniform index, and glass tube distance should be less than 15 mm. 4, flexible adjustment screw should be able to rotate, and scale stay in any position to the top. 5, the scale of the center line, glass tube and the axis of the cistern, three parallel to each other. Among them, the glass tube should be located in the middle scale, left and right deviation shall not be more than 1/4 of the shortest scribed line. 6, the reader should be flexible to move up and down, and be able to stay in the desired location. Scribed line width should be & lt; 0. 25 mm, before and after the scribed line shall be in the same horizontal plane. 7, parts installation is strong. Should not have skewed, loose, deformation etc. Phenomenon, should not have phenomenon of permeability with mercury, the protective layer on the surface of the instrument is strong, uniform, bright and clean. 8, single tube sheet should be able to in a 15 - + 45 ℃ under the condition of normal use. ^ 0-9, measurement range Hpa 1050 hpa, dividing the value of 1. 10, the checking point error value should not be more than 11. 0hPa; Adjacent (of error of The two adjacent check point) of error of 1 the difference shall not exceed the soil. 0hPa。 11, attached thermometer shall not exceed 10 of error. 5C`。