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Seismic pressure gauges are suitable for environments with severe vibrations; they can withstand pulsations, shocks, and sudden load releases, providing a stable and clear indication. It is widely used in industries such as machinery, petroleum, chemicals, metallurgy, mining, and power generation to measure the pressure of media that are non-corrosive to copper and copper alloys. Pressure gauges are extremely widely used, found in almost all industrial processes and research fields. Gauge pressure meters are widely used in thermal piping networks, oil and gas transmission systems, water and gas supply systems, as well as in vehicle repair shops. There are many types of pressure gauges; in addition to ordinary pressure gauges, there are also precision pressure gauges ； There are not only regular pressure gauges, but also special pressure gauges ； There are not only contact pressure gauges, but also remote transmission pressure gauges ； There are not only vibration-resistant pressure gauges, but also earthquake-resistant pressure gauges ； There are not only diaphragm pressure gauges, but also corrosion-resistant pressure gauges... Despite their variety, their structural principles are essentially the same. The difference lies only in the manufacturing materials and their respective specific additional structures, etc. Complete pressure gauge series (PressureGauge Series Full). It not only has a regular series but also a standard series ； There are not only ordinary medium application series but also special medium application series ； There are not only switch signal series but also remote transmission signal series, among others; all of these have arisen from practical needs and have gradually formed a complete set of series. The pressure gauges come in a wide range of specifications and models, with well-developed design configurations (the specification for pressure gauges is comprehensive). In terms of nominal diameter, there are Φ60mm, Φ75mm, Φ100mm, Φ150mm, Φ200mm, Φ250mm, Φ300mm, etc. In terms of installation structure, there are direct installation type, embedded installation type, and protruding installation type. The embedded installation type is further divided into radial embedded type and axial embedded type, while the protruding installation type also has radial protruding type and axial protruding type. Direct mounting types are further divided into radial direct mounting and axial direct mounting. Among them, the radial direct mounting type is the basic installation style; generally, when no specific installation structure is specified, it refers to the radial direct mounting type. Due to the stability requirements of its own support, the axially direct-mounted type is generally used only on pressure gauges with a nominal diameter of less than 150 mm. The so-called built-in and protruding pressure gauges are what we commonly refer to as pressure gauges with edges (mounting rings). Axially embedded type refers to those with edges in the axial direction, radially embedded type refers to those with edges in the radial direction, and radially protruding type (also known as wall-mounted type) refers to pressure gauges with edges in the radial direction. In terms of the quantity range and scale segments, within the positive pressure range, there are micro-pressure scale segments, low-pressure scale segments, medium-pressure scale segments, high-pressure scale segments, and ultra-high-pressure scale segments; each of these scale segments is further divided into several measurement ranges (instrument scales) ； In the negative pressure range (vacuum), there are also 3 types of negative pressure (vacuum gauge) ； A pressure gauge with combined positive and negative pressure is a pressure gauge that operates across multiple pressure ranges. Its standard name is pressure-vacuum gauge; it is also known as vacuum-pressure gauge. It can measure not only positive pressure but also negative pressure. The accuracy grade classification for pressure gauges is very clear. Common accuracy grades include 4 grade, 2.5 grade, 1.6 grade, 1 grade, 0.4 grade, 0.25 grade, 0.16 grade, 0.1 grade, etc. The accuracy grade should generally be indicated on its dial, and there are corresponding rules for such indication; for example, “①” indicates that the accuracy grade is level 1. For some pressure gauges with very low accuracy grades, such as those in grade 4, and for those that do not require an accurate measurement of pressure but only need to indicate the pressure range, such as the pressure gauges on fire extinguishers, it is not necessary to indicate the accuracy grade. Gauge specifications and models: Model specifications, nominal diameter – Y—100, Y—100T, Y—100Z, Y—100ZQ, Y—100TQ. Types: radial without edge, radial with rear edge, axial without edge, axial with front edge, radial with front edge. Dial diameter: 100 mm for Y—100, Y—150, TY—150, ZY—150, ZQY—150, TQ; 150 mm for the same types. Meaning of the letters used in the model designation: Y—pressure ； Z—vacuum (indicates axial direction after the number) ； B—Standard (explosion-proof) ； J—Precision ； A—Ammonia table ； X—signal (electrical contact) ； P—diaphragm ； E—diaphragm box ； F—Corrosion resistance (stainless steel) ； XC—Magnetic-assisted electrical contact ； N—Seismic resistance ； T—bimetallic strip ； For example: YTF—Stainless steel Bourdon tube pressure gauge ； YA—Ammonia pressure gauge ； YXC—Magnetic-assisted electric contact pressure gauge ； YZ—Vacuum pressure gauge ； YN—Seismic pressure gauge ； YTP—Diaphragm spring tube pressure gauge ；