Introduction to the most common pressure gauges

2022-08-06
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Introduction to common pressure gauges

shock resistant pressure gauges are suitable for places with severe environmental vibration. They can withstand the pulsation, impact and sudden unloading of media. The instrument indication is stable and clear. It is widely used in machinery, petroleum, chemical industry, metallurgy, mining, electric power and other departments to measure the pressure of non corrosive medium to copper and copper alloys. Pressure gauge is widely used in almost all industrial processes and scientific research fields. In the heat pipe, oil and gas transmission, water supply and gas supply system, vehicle maintenance plant, Pressure gauge applications can be seen everywhere

there are many types of pressure gauges (many types of press adopt anti-interference design when collecting signals). It has not only general pressure gauges (ordinary pressure gauges), but also precision pressure gauges; There are not only conventional pressure gauges, but also special pressure gauges; There are not only contact pressure gauges, but also remote pressure gauges; There are not only anti vibration pressure gauges, but also anti-seismic pressure gauges; There are not only diaphragm pressure gauges, but also Corrosion-resistant Pressure gauges. Although there are many kinds of them, their structural principles are basically the same. The difference lies only in the manufacturing materials and their specific additional structures

pressure gauge series full. It has not only conventional series, but also standard series; There are not only ordinary media application series, but also special media application series; There are not only switch signal series, but also remote signal series, etc., which are derived from practical needs and have successively formed a complete series

pressure gauge specifications are complete. From the nominal diameter, there are Φ 40mm、 Φ 60mm、 Φ 100mm、 Φ 150mm、 Φ 200mm、 Φ 250mm, etc

from the perspective of mounting structure type, there are direct mounting type, flush mounting type and convex mounting type. The flush mounting type is divided into radial flush mounting type and axial flush mounting type, and the convex mounting type is also divided into radial flush mounting type and axial flush mounting type. Direct installation type is divided into radial direct installation type and axial direct installation type. 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. In consideration of the stability of its own support, the axial direct installation type is generally selected only for pressure gauges with a nominal diameter less than 150mm. The so-called flush mounted and convex mounted pressure gauges are commonly referred to as pressure gauges with edges (mounting rings). The axial embedded type refers to the axial forward band edge, the radial embedded type refers to the radial forward band edge, and the radial convex type (also known as the wall mounted type) refers to the radial backward band edge pressure gauge

from the view of measuring range and measuring range, the positive pressure measuring range is divided into micro pressure measuring range, low pressure measuring range, medium pressure measuring range, high pressure measuring range and ultra-high pressure measuring range, and each measuring range is subdivided into several measuring ranges (instrument range); In the negative pressure range (vacuum), there are three kinds of negative pressure (vacuum gauge); The pressure gauge with positive pressure and negative pressure is a kind of pressure gauge across the measurement range. Its specification name is pressure vacuum gauge, also known as vacuum pressure gauge. It can measure not only positive pressure but also negative pressure

pressure gauge the accuracy of classification. Common accuracy levels include level 4, 2.5, 1.6, 1, 0.4, 0.25, 0.16, 0.1, etc. Generally, the accuracy grade shall be marked on the dial, and the identification shall also have corresponding provisions. For example, "①" indicates that the accuracy grade is grade 1. For some pressure gauges with very low accuracy grade, such as those under Grade 4, there are others that do not need to measure their accurate pressure value and only need to indicate the pressure range, such as the pressure gauge on the fire extinguisher, the accuracy grade may not be marked

below, we list several typical pressure gauges. Give brief descriptions respectively to make you have a more in-depth understanding of them

ordinary pressure gauge (the name of the specification is "general pressure gauge") is the most basic type of pressure gauge. With complete series, simple structure, reliable performance, intuitive indication and low cost, it is the most widely used pressure gauge. Precision pressure gauges, formerly known as standard pressure gauges, are high-end products of pressure gauges from the perspective of accuracy grade. In the specification, pressure gauges with accuracy grade above 0.4 (including 0.4) are classified as precision pressure gauges. Precision pressure gauges are basically used for the transmission of pressure values. With the improvement of pressure measurement accuracy requirements in industrial processes, the application of this kind of pressure gauge in measurement has also increased significantly

the manufacturing process of precision pressure gauge is relatively complex. Whether from the perspective of horizontal structural sensing element adopted by the host of elastic sensitivity testing machine or from the perspective of transmission amplification mechanism, the process is very rigorous to ensure its performance. In addition to the excellent elastic properties of the materials used to manufacture the elastic sensing elements of the precision pressure gauge, the cold work hardening process parameters, artificial aging and natural aging process parameters of the rolled elastic sensing elements, and the geometric dimensions and shapes of the elastic sensing elements are all technical secrets of the manufacturers. It can be said that the manufacturing capacity of precision pressure gauge represents the pressure gauge level of the manufacturer

the range of precision pressure gauge is very wide, and products are produced from -0.1 ~ 0mpa to 0 ~ 100MPa. Among them, micro pressure meter and high pressure meter are very difficult to manufacture, with low output and high price. Electric contact pressure gauge is a kind of pressure gauge that can send switching signals. The electric contact pressure gauge is subdivided into single electric contact, double electric contact and multi contact electric contact pressure gauge, which can adapt to different control needs through various electric contacts. 3. From the aspect of electric contact power of electric contact pressure gauge installed in the experimental gearbox, there are also conventional electric contact pressure gauge, photoelectric electric contact pressure gauge, inductive electric contact pressure gauge and magnetic assisted electric contact pressure gauge. The magnetic assisted electric contact pressure gauge increases the contact torque of electric contact through magnetic force assistance and has relatively high electric contact power. However, due to the effect of magnetic force on the electric contact, the contact signal accuracy of the electric contact is low. In terms of the requirements for the use environment, there are also conventional electric contact pressure gauges, vibration resistant electric contact pressure gauges, corrosion-resistant electric contact pressure gauges, high temperature resistant electric contact pressure gauges, diaphragm electric contact pressure gauges and explosion-proof electric contact pressure gauges. For the automobile industry, the medium explosion-proof electric contact pressure gauge is subdivided into explosion-proof electric contact pressure gauge and safety spark electric contact pressure gauge

the key component of the electric contact pressure gauge is the signal mechanism of the electric contact, and its main technical indicators are the insulation resistance and insulation strength of the electric contact signal mechanism. During the delivery inspection of the electric contact pressure gauge, the two main technical indicators of the electric contact shall be inspected one by one

since the tube end force of the elastic sensitive element of the electric contact pressure gauge should drive the indicating mechanism and the electric contact signal mechanism at the same time, and this kind of electric contact pressure gauge has not only the indication accuracy requirements, but also the accuracy requirements of the signal sent by the electric contact, the accuracy grade of the electric contact pressure gauge is generally below 0.4. The measuring ranges of various electric contact pressure gauges are complete, including vacuum electric contact pressure gauge, low-voltage electric contact pressure gauge, medium voltage electric contact pressure gauge, high-voltage electric contact pressure gauge and micro piezoelectric contact pressure gauge. Among them, the micro piezoelectric contact pressure gauge is difficult to manufacture because of its small tube end force. Therefore, few manufacturers produce this kind of micro piezoelectric contact pressure gauge

remote pressure gauge is a kind of pressure gauge that can sense and indicate the pressure, and can also send a synchronous linear signal remotely. In order to realize local measurement indication and synchronously transmit pressure signal to the remote. From the working principle of remote pressure gauge, there are two types at present. One is a resistance remote pressure gauge that expresses the pressure value by transmitting resistance signal. Its synchronous pressure signal is a resistance value "Ω", hence the name resistance remote pressure gauge. One is an inductive remote pressure gauge that uses current signal to transmit pressure value, which is usually called differential remote pressure gauge. The synchronous pressure signal transmitted by it is a current value of "Ma". Whether resistance remote pressure gauge or inductance (differential) remote pressure gauge, they all have their own derivative series products. Such as remote pressure gauge with various installation structure forms, adaptability of various media and practical ability of various environmental conditions. These remote pressure gauges can provide standard resistance signals or current signals for secondary instruments, unit instruments or actuators. Stainless steel pressure gauge is a pressure gauge made of stainless steel. Stainless steel pressure gauges are divided into conventional stainless steel pressure gauges and all stainless steel pressure gauges. Conventional stainless steel pressure gauge is mainly used to measure the pressure of corrosive medium. All stainless steel pressure gauge is used to measure the pressure of corrosive medium in the environment with corrosive components. There are many kinds of pressure gauges for measuring specific media, and the stainless steel pressure gauge listed in the left figure is only one of them. There are also ammonia pressure gauges, oxygen pressure gauges, hydrogen pressure gauges, chlorine pressure gauges, etc., which are made of specific materials and processes based on specific medium pressure measurement or specific requirements of environmental conditions

of course, in addition to some for specific media, there are also some special pressure gauges. Such as: Marine pressure gauge, fluorine pressure gauge, tire pressure gauge, etc. The tire pressure gauge is a pressure gauge with specific structure and function to meet and facilitate special requirements

the so-called double needle pressure gauges refer to double needle and double tube pressure gauges, which are typical special pressure gauges. This instrument is equipped with two measured object interfaces, which can be connected to two measured objects at the same time, and the color separation pointer indicates the respective pressure of the two measured objects at the same time. It is especially suitable for two measuring objects that need to compare readings at the same time. The internal structure of the double needle pressure gauge is also very characteristic. It skillfully combines the two measuring mechanisms and is independent of each other. These two independent measuring mechanisms drag their own pointers to indicate their respective pressures on the same dial. The comparison error is effectively reduced from the reading device to the maximum, and the comparison reading accuracy of the two measured objects is obviously improved

there is also a double-sided pressure gauge, which is a double needle double-sided single tube pressure gauge. The double-sided pressure gauge is designed and manufactured to meet the requirements of multi-directional reading. It has only one interface of the measured object, a set of measuring mechanism and a special transmission amplification mechanism. Two sets of reading devices are distributed on both sides. The transmission amplification mechanism of this double-sided pressure gauge has a unique design, which allows you to obtain the same reading effect on both sides. Isolation membrane pressure gauges are another kind of pressure gauges used to measure specific media, which work by means of medium isolation. Diaphragm pressure gauge is composed of pressure gauge and isolating device. The material used to make the pressure gauge has nothing to do with the measured medium, because the pressure gauge itself does not contact those specific media. It is used to indirectly measure the pressure of a specific medium in an isolated state. Therefore, this pressure gauge has many excellent characteristics. Its precision can be high, and it can adapt to a wide range of media objects, as long as the corresponding media isolation diaphragm is selected. The diaphragm pressure gauge provides a variety of connection structures, such as threaded connection

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