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1. Through several years of experience in pressure gauge verification and communication with users, it is found that many users reflect that their pressure gauges are not broken, but disassembled before submission for inspection or damaged during reassembly, that is, they are "broken". Therefore, as a more precise instrument, the pressure gauge must consider its precautions in all aspects, such as installation, disassembly, transportation, reinstallation, etc. Installation after verification needs to take into account the tightness. Most users use raw tape to ensure the tightness. Some installers may have a relatively large amount of winding due to their strong hand; In consideration of the installation position, observation direction and other factors, some masters will also have differences... Therefore, it will appear that some pressure gauges are qualified during inspection, and it will be more troublesome to disassemble them after reinstallation, and some must borrow a wrench to screw them off; Some users will mistakenly think that the watch is broken because the air tightness cannot be reached after reinstallation, resulting in the immobility of the pointer; After several times of disassembly and installation, the thread buckle of some pressure gauges has been seriously damaged, resulting in failure to fit with relevant standards. 2. Because the pressure gauge is widely used, its measurement unit includes not only the commonly used MPa, kPa and PA in China, but also the commonly used units in foreign countries.

According to JJG 52-2013 verification regulation of elastic element general pressure gauge, pressure vacuum gauge and vacuum gauge, the upper and lower switching values of the electric contact pressure gauge need to be verified in the verification process. "When the electric contact acts and has an output signal, stop increasing and decreasing the pressure and read the pressure value on the calibrator", that is, the pressure gauge calibrator can recognize the electrical signal of the terminal of the electric contact pressure gauge. However, in the actual verification process, there will be the phenomenon that the electrical signal cannot be detected. One reason is that the electrical contact of the electrical contact pressure gauge does have problems, and the other reason is the wrong wiring of the terminal or the poor contact between the detection equipment and the electrical contact.

Pressure gauge is a very common instrument. Like many measuring equipment, pressure gauges need to be calibrated regularly to ensure their accuracy. Many factors need to be considered when calibrating the pressure gauge. This paper lists 10 factors that should be considered when calibrating the pressure gauge. Before that, we can briefly understand the principle of pressure gauge calibration.

Wuxi Kaifeng pressure gauge to provide long-term vibration proof pressure gauge production of hydraulic equipment. Many customers become Wuxi Kaifeng case pressure gauge integrity and service witness. The customers have a good cooperation with Wuxi Kaifeng Kaifeng pressure gauge, pressure gauge vibration proof pressure gauge is one of the required products. Let's see what it was then!

Firstly, classify the pressure instruments. The pressure measuring instruments are divided into two categories: on-site pressure gauge and remote pressure gauge according to their uses and usage habits, and then further classify them in detail according to their different measurement principles.

Spring tube pressure gauge, referred to as pressure gauge, is widely used in boilers, pressure vessels, pressure pipelines and other special equipment. In the process of use, because the pressure gauge is usually used in high temperature, high pressure, corrosion and other occasions, its quality evaluation directly affects the safety production and quality. Under adverse conditions such as high-frequency oscillation, it is easy to cause the deformation and movement of spring tube. Spring tube pressure gauge usually refers to the single ring "C" spring tube designed to measure the hydraulic and pneumatic pressure of non corrosive instrument parts.

Wuxi Kaifeng pressure gauge to provide long-term vibration proof pressure gauge production of hydraulic equipment. Many customers become Wuxi Kaifeng case pressure gauge integrity and service witness. The customers have a good cooperation with Wuxi Kaifeng Kaifeng pressure gauge, pressure gauge vibration proof pressure gauge is one of the required products. Let's see what it was then!

The pressure gauge is used for a period of time, but the gauge pressure is not stable, or the pressure gauge is removed for maintenance, we sometimes find a pointer to a pointer to the original straight sword has become scimitar shape, if you look carefully, in the "back" will leave little dent or the size of the depression obviously, the pointer is bending. Bending pressure gauge pressure gauge pointer, a relative check nails, "the" bent down, this is because the pressure gauge at work when the pressure relief is too fast, too fast, so that the pointer violently and repeatedly hit the nail plate check. This is generally in the lower side of the pressure gauge pointer, pointer and check the location of the contact pin, can be seen by the impact of severe impact, traces of this site will leave the gap depth. There is a relative pressure check dial "back" to the curved nail. This is because the pressure gauge is used, pressure is too large, too fast to the pressure gauge pointer clockwise disc check and nail bending impact. The same will leave a gap in the upper side of the pressure gauge pointer. The gauge pressure of the material is generally Aluminum Alloy plate, if the pressure gauge pointer material is too thin, the material is too soft, the reason is als

Digital pressure gauge using liquid crystal display technology used in strong will reduce the service life of the LCD screen, and may be caused by a digital pressure gauge data identification is not clear, so the location of digital pressure meter installation to avoid glare. If the digital pressure meter or the consequence of the safety accident caused by the strong light, the production factory of the digital pressure meter will not take any responsibility. Digital pressure gauge Digital pressure gauge stainless steel wetted parts of metal materials and ceramic sensor can directly measure the weak alkaline medium, if the digital pressure gauge measurement of strong acid medium in the selection should pay more attention to mind the use of diaphragm digital pressure gauge. Digital pressure meter using non rechargeable lithium battery, after the use of digital pressure meter lithium battery should be properly handled. Digital pressure gauge used in low temperature (less than -30 DEG C), may cause the digital pressure gauge does not show the faults such as the use of more than 85 DEG C in high temperature conditions, should be added to the radiator, otherwise the digital pressure gauge measuring accuracy can not be guaranteed, but also in high temperature lithium battery to the risk of explosion. In the process of storage or transportation should also pay attention to the temperature of digital pressure meter.

In the verification process of some seismic pressure gauge does not need to be a small rubber plug at the top of the case removed verification can be qualified, and some seismic pressure gauge will take off the small rubber plug for qualified. Vibration proof pressure gauge case memory pressure, why the same batch of products will be different? In the use of seismic pressure gauge, whether the small rubber plug is removed using the right? Then we come to the situation above, a little analysis: 1 first users should be provided by the manufacturer of the "manual" operation, to avoid some of the instruments in the test And use some of the misconceptions. Provisions of "seismic pressure gauge instructions for instrument calibration, the oil should be filled on the case of hole sealing screws or finished oil hole on the rubber sealing plug pull from the case, to prevent suffocation and impact test results". From the vibration proof pressure gauge instructions, requiring all the seismic pressure gauge to the case on the flushing oil hole sealing screws or finished oil hole on the rubber sealing plug pull in verification. 2 in general, seismic pressure gauge case affected due to suffocation test results are mostly small range vibration proof pressure gauge, according to market m

Whether the pressure gauge can display normally depends largely on the service environment of the spring tube pressure gauge. The service environment of the spring tube pressure gauge needs to meet the relevant requirements. In case of severe haze weather, strong air acidity or heavy air humidity, protective measures need to be taken on the surface of the spring tube pressure gauge to prevent its internal parts from environmental erosion, so as to ensure the accuracy of detection. The appropriate pressure measurement range is above 40MPa. For pressure measurement below 40MPa, bellows pressure gauge or die box pressure gauge and other measuring instruments need to be used. When measuring the pressure of liquid container, if the internal liquid is strongly acidic, corrosive or flammable and explosive, it is necessary to use vibration resistant pressure gauge or explosion-proof pressure controller.

Diaphragm pressure gauge is suitable for measuring the pressure of liquid, gas or steam without explosion hazard, crystallization, solidification and high viscosity, but without corrosion to copper and copper alloy

Special pressure gauge is a device made of stainless steel, which is suitable for occasions with special requirements for pressure measuring instruments in the production process of various industrial departments.

For measuring the medium pressure with strong corrosion, high temperature, high viscosity, easy crystallization, easy solidification and solid floating matter, as well as the occasions where the measuring medium must be prevented from entering the general-purpose pressure instrument directly and sediment accumulation must be prevented and easy to clean, the diaphragm gauge composed of diaphragm isolator and general-purpose pressure instrument must be used.

Ytn-100 shockproof pressure gauge is suitable for places with violent vibration in the environment. It can withstand the pulsation, impact and sudden unloading of the medium. The indication of the instrument 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 alloy.

General pressure gauge refers to an instrument with spring tube as elastic element and sensitive element to measure and indicate higher than ambient pressure. In the process of industrial process control and technical measurement, because the elastic sensitive element of mechanical pressure gauge has the characteristics of high mechanical strength and convenient production, mechanical pressure gauge has been more and more widely used. Pressure gauge, vacuum gauge and pressure vacuum gauge with accuracy level equal to or lower than 1.0 are collectively referred to as general pressure gauge.

Industrial enterprises themselves need to pay more attention to the measurement and verification of pressure gauges, strengthen the training of technicians, and ensure the timely dissemination of theoretical knowledge, especially when introducing new pressure gauges. Different types, specifications and purposes of pressure gauges need to adopt different measurement verification methods. Enterprises should establish perfect measurement verification processes and standards of pressure gauges, and strengthen the supervision and management of measurement verification. After the measurement verification of pressure gauge is completed, the verification results need to be recorded in time, with particular attention to the safety attribute of pressure gauge. In case of verification errors, it is necessary to analyze the main causes of errors, so as to create good conditions for follow-up work.