Basic introduction of precision pressure gauge

There are many types of precision pressure gauges. It not only has general (ordinary) pointer indication type, but also digital type; not only conventional type but also special type; not only contact type, but also remote transmission type; not only vibration-resistant type, but also Anti-vibration type; not only diaphragm type, but also corrosion-resistant type.　　
The series of precision pressure gauges is complete. It has not only the conventional series, but also the digital series; not only the ordinary medium application series, but also the special medium application series; not only the switch signal series, but also the remote signal series, etc., all of which are derived from practical needs and have formed The complete series.　　
The specifications and models of the precision pressure gauge are complete, and the structure is perfect. In terms of nominal diameter, there are Φ40mm, Φ50mm, Φ60mm, Φ75mm, Φ100mm, Φ150mm, Φ200mm, Φ250mm, etc.　　
From the perspective of the installation structure, there are direct installation, embedded installation and convex installation. The embedded installation is divided into radial embedded installation and axial embedded installation. The convex installation also has radial convex installation and axial installation. Convex-mounted points. Direct installation is divided into radial direct installation and axial direct installation. The radial direct installation type is the basic installation type. Generally, when the installation structure type is not specified, it refers to the radial direct installation type. The axial direct mounting type considers the stability of its own support and is generally only used on pressure gauges with a nominal diameter of less than 150mm. The so-called built-in and convex-mounted pressure gauges are the pressure gauges with edge (mounting ring) we often say. Axial built-in type refers to both axial front with edge, radial built-in type refers to the radial front with edge, and radial convex type (also called wall mount) refers to the radial back with edge pressure gauge.　　
From the perspective of measurement domain and range section, the positive pressure measurement domain is divided into micro pressure range section, low pressure range section, medium pressure range section, high pressure range section, and ultra-high pressure range section. In each range section Several measurement ranges (instrument range) are subdivided; there are three kinds of negative pressure (vacuum gauge) in the negative pressure measurement domain (vacuum); the pressure gauge of the positive pressure and the negative pressure is a pressure across the measurement domain table. Its standard name is pressure vacuum gauge, also called vacuum pressure gauge. It can measure not only positive pressure but also negative pressure.　　
The accuracy level classification of precision pressure gauges is very clear. Common accuracy levels are 4, 2.5, 1.6, 1, 0.4, 0.25, 0.16, 0.1, etc. The accuracy grade should generally be marked on the dial, and its marking has corresponding regulations, such as "①" means its accuracy grade is level 1. For some pressure gauges with a very low accuracy level, such as those under level 4, some do not need to measure the exact pressure value, but only need to indicate the pressure range, such as the pressure gauge on a fire extinguisher, without marking the accuracy level .

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