How can you tell the accuracy grade of the pressure gauge? How to judge if there is no mark?
How can you tell the accuracy grade of the pressure gauge? How to judge and identify? The most accurate way is to look at the product information manual provided by the manufacturer. If you can't find it, you can also look at the label on the dial of the pressure gauge. 1.6 in the circle shown by the arrow in the figure below represents the accuracy grade of the pressure gauge. CL or KL will be used to indicate the accuracy on the dial of some foreign pressure gauges.
If there is no product data provided by the manufacturer and there is no indication on the pressure gauge, is there any way to know the accuracy level of the pressure gauge? There are some methods, but because the pressure gauge designs of different manufacturers are different, we can only make a rough judgment based on design experience. Pressure gauges are divided into general pressure gauges and precision pressure gauges according to their accuracy.
The accuracy classification of the national standard general pressure gauge (GB / T 1226-2010) is the same as that of foreign countries, which is level 1, level 1.6, level 2.5 and level 4 respectively. According to the national standard precision pressure gauges (GB / T 1227-2010), the precision of precision pressure gauges is divided into 0.1, 0.16, 0.25 and 0.4.
The dial of precision pressure gauge will be marked for visual display of accuracy. The nominal diameter designed according to the national standard precision pressure gauge is greater than or equal to 150mm, so the pressure gauge with the nominal diameter below 150mm should be excluded first. Generally speaking, the smaller the nominal diameter of the pressure gauge, the more sparse the scale marks on the dial, and the lower the accuracy of the reading. At this time, it is meaningless to design the mechanical accuracy of the pressure gauge no higher. Therefore, relatively speaking, the denser the scale line, the thinner the pointer, and the higher the accuracy of the pressure gauge.
