A pressure meter is an instrument that measures and indicates higher than the ambient pressure with an elastic element as a sensitive element. It is widely used in almost all industrial processes and research fields. In the heat pipe network, oil and gas transmission, water supply system, vehicle repair and maintenance shop, and other fields can be seen everywhere. Especially in the control and measurement process, because the elastic sensitive element of mechanical pressure gauge has the characteristics of high mechanical strength and convenient production, the mechanical pressure gauge is widely used.
1, general pressure gauge spring tube is having a cross section shape (the circle and ellipse flat two), bent into a'C'shape, and can satisfy the requirements of the elastic tube spring. If the spring tube is too small, it will affect the accuracy level of the pressure gauge.
2. The indication of the pressure gauge exceeds the allowable error, and the adjusting screw of the meter should be adjusted. If the table does not have a value adjustment screw, this table can only be judged to be unqualified.
3. Gauges, dials, indexing numbers and symbols shall be complete and clear. Dial scale should be evenly distributed, the central angle of the package is generally 270 degrees, the pointer of the pressure gauge should extend into all the index lines, and the pointer indicating end width should not be greater than the minimum graduation interval of 1/5. The distance between the pointer and dial plane should be in the range of 1 ~ 3mm, the outside diameter of the watch case is more than 200mm (including 200mm), and the distance between the pointer and the dial plate should be within 2 ~ 4mm.
4. A pressure gauge with a stop pin. In the absence of pressure or vacuum, the indicator shall be close to the stop pin, and shall not exceed the specified allowable error.
5. The pressure gauge case should be able to protect the internal parts from contamination. The pressure gauge shall be provided with safety holes, and the safety holes shall be provided with dust-proof devices.
6, digital pressure gauge depends on the overall structure of the reasonableness of the selected material, the aging process of electronic components, long-term stability.