Dial The dial of the pressure gauge is the part that sh […]
The dial of the pressure gauge is the part that should be observed when judging the quality. The numbers on the dial of the pressure gauge should be clear, complete, and easy to recognize, the scale is NB smoke, WiFi smoke, remote transmission module of each fire engine, 4G remote control module , Wireless intelligent NB pressure gauge level gauge, WiFi water leakage alarm, combustible gas alarm, one-key alarm system, free platform, fire management platform, fire management APP ruler should be evenly distributed, center angle is 270 °. The indexing numbers and symbols of the dial of the pressure gauge should be complete and clear. The pointer of the pressure gauge should extend into all the dividing lines, and the width of the pointer indicating end should not be greater than 1/5 of the minimum indexing interval. The distance between the pointer and the plane of the index plate should be in the range of 1~3mm. If the outer diameter of the case is more than 200mm (including 200mm), the distance between the pointer and the plane of the index plate should be in the range of 2~4mm.
Elastic sensitive element
The elastic sensitive element of the pressure gauge, such as the spring tube, is an important part of the pressure gauge. It determines whether the measurement performance of the pressure gauge can meet the needs of use. The spring tube of the pressure gauge must have sufficient elasticity to meet the measurement requirements. If the elastic sensing element is too small, it will affect the accuracy level of the pressure gauge.
The measurement results of the pressure gauge generally have a certain error, which is the situation that each pressure gauge will exist, but the display value of the pressure gauge cannot exceed the allowable error. If the indication of the pressure gauge exceeds the allowable range, the adjustment screw should be adjusted. If the pressure gauge cannot be adjusted, it can only be judged as unqualified.
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The shell of the pressure gauge is sturdy and reliable, and the sealed shell of the pressure gauge should be leak-free. The shell of the pressure gauge should be designed with safety holes, and the safety holes should be provided with dustproof settings to protect the internal components from corrosion or pollution. Especially for pressure gauges such as diaphragm pressure gauges used in corrosion or other complex environments, more attention should be paid to the quality of the housing.
The spring tube of a general pressure gauge is a tubular spring with a certain cross-sectional shape (usually flat round and approximately elliptical), bent into a "C" shape, and can meet certain elastic requirements. If the spring tube is too small, it will affect the accuracy level of the pressure gauge.
If the indication value of the pressure gauge exceeds the allowable error, the indication adjustment screw of the gauge should be adjusted. If there is no indication adjustment screw of the gauge, the gauge can only be judged as unqualified.
For a pressure gauge with a stop pin, the pointer should be close to the stop pin when there is no pressure or vacuum, and the "reduced grid" must not exceed the specified allowable error.
The digital pressure gauge depends on the rationality of the overall structure, the selected materials, the aging process of the electronic components, and the long-term stability.
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