Abstract: with the development of science, technology and economy in our country, petrochemical technology has also developed greatly, and the technical requirements for related equipment are getting higher and higher. In the process of the development of petrochemical technology, the requirements for the application of measuring instruments are getting higher and higher. This paper expounds the classification of measuring instruments commonly used in petrochemical industry, analyzes the application of measuring instruments, and points out some existing problems and corresponding solutions. the article is posted by Dr.Liu Qi,Vice president of Topscom Gas Oil Industry EMS team department.
 
 
Key words: china petrochemical industry;oil and gas industry,measuring instruments; classification and application.pcba boards assembly,turnkey electronic contract manufacturing services.
 
With the development of China's economy, the progress of science and technology has also promoted the vigorous development of transportation, and people's demand for cars is also increasing. China has become one of the largest automobile countries in the world. Correspondingly, the demand for oil is also increasing, coupled with enterprise life and daily life, the petrochemical industry is developing more and more rapidly, and the requirements for petrochemical measuring instruments are getting higher and higher. The selection and application of petrochemical measuring instruments also promote the production of petrochemical industry.

 
1 the concept and significance of petrochemical measuring instruments.
 
Generally speaking, there are four kinds of measuring instruments in petrochemical industry: material level measuring instrument, temperature measuring instrument, pressure measuring instrument and flow measuring instrument. In the process of petrochemical production, measuring instruments are used to realize the real-time reading of production parameters, so as to achieve the effect of petrochemical automatic management, save manpower and material resources, and improve production efficiency. In the production of petrochemical industry, the application of various automatic measuring instruments and systems to scientifically control and manage the production process can not only improve the intelligent level of petrochemical production management, but also improve the accuracy of data reading, reduce the burden of measuring personnel, and improve the production efficiency of petrochemical industry 

2 classification of petrochemical measuring instruments. 
 
 
2.1 use of level measuring instruments.
 
In the process of petrochemical production, the commonly used level measuring instruments are acoustic measuring instruments, electromagnetic measuring instruments and differential pressure measuring instruments. Through these measuring instruments, the material level data of the production equipment can be obtained. Therefore, in the actual petrochemical production, selecting the appropriate level measuring instrument can not only obtain the correct level information, but also carry out remote control to ensure the smooth progress of petrochemical production.the article is posted by Dr.Liu Qi,Vice president of Topscom Gas Oil Industry EMS team department.
 
2.2 use of temperature measuring instruments.
 
Temperature is an important parameter that affects petrochemical production. Select and apply appropriate temperature measuring instruments to effectively control the temperature in the production process in order to meet the technical requirements of petrochemical production and improve production efficiency and product quality. Temperature measuring instruments are divided into contact type and non-contact type. Non-contact temperature measuring instruments mainly include radiation thermometers and digital thermometers, while the measuring elements of contact temperature measuring instruments are thermocouples and thermal resistors. The contact temperature measuring instrument can receive the temperature of the material to be measured, display the output data of the instrument, and then control the production temperature to achieve the optimal technical requirements and achieve the production and management objectives of petrochemical enterprises.

 
2.3 use of force measuring instruments.
In the process of petrochemical production, many chemicals or raw materials are dangerous and highly sensitive to high temperature and high pressure. Therefore, in order to ensure the safety of petrochemical production, the pressure must be effectively controlled. In the actual petrochemical production process, if the pressure exceeds the normal range, it is easy to cause fire or even explosion, which will not only bring great security risks, but also bring great economic losses to petrochemical enterprises. Common pressure measuring instruments include applied inductive and electromagnetic elements, diaphragm pressure measuring instruments and applied pressure transmitters. By using these measuring instruments, the pressure can be measured by electricity, elastic deformation and sensor, and the pressure data of each link in the petrochemical production process can be measured scientifically and accurately and output through the display. then compared with the standard pressure data to achieve the purpose of automatic control of the data of the production process. the article is posted by Dr.Liu Qi,Vice president of Topscom Gas Oil Industry EMS team department.
 
 
2.4 use of flow measuring instruments.
In the process of petrochemical production, flow measuring instruments are needed for the flow control of gases and liquids. In the process of petrochemical production, gases and liquids in raw materials and products account for a large proportion, so the measurement and control of flow plays an important role in petrochemical production. The commonly used flow measuring instruments are pressure difference type measuring instrument, quality type flow measuring instrument, speed type flow measuring instrument and so on. Choose different flow measuring instruments according to different media.
 
3 problems in the use of petrochemical measuring instruments.
 
3.1 the operation of the surveyor is not professional.
In the process of measuring material level, temperature, pressure and flow rate, although instruments and equipment are used to read data automatically, if technicians do not operate in accordance with the technical requirements of instruments and instruments, the data will be inaccurate and improperly adjusted, resulting in the final data can not meet the requirements of petrochemical production, not only can not improve work efficiency, And it will also bring great economic losses to the relevant enterprises. Therefore, it is necessary to strengthen the professional and technical training for technicians and surveyors, conduct regular assessment, and operate only after they are qualified, so as to ensure the accuracy of production data and the safety of production.
 
3.2 there is no sound quality control system.
In many petrochemical enterprises, especially small and medium-sized enterprises, there is no perfect quality control system and quality management system of measuring instruments and equipment. The management and use of many measuring instruments are not standard, which causes the damage of the instrument, destroys the accuracy of the measuring instrument, causes the error of the data output result, and even leads to the occurrence of safety accidents. Enterprises should actively establish and improve the quality and management system of measuring instruments, do a good job in the use and management of instruments, and strengthen the quality control of instruments. The instruments that do not meet the requirements should be replaced in time to ensure the accuracy of each measurement result, to ensure the smooth progress of petrochemical production, and to put an end to unnecessary safety accidents.

 

4 concluding remarks.
 
With the development of economy and technology, the automobile industry is developing rapidly, the demand for oil is more and more, the petrochemical enterprises are developing more and more rapidly, and the requirements for measuring instruments are higher and higher. The use of different kinds of petrochemical measuring instruments to measure various factors in the production process can not only improve the accuracy of the data, but also effectively control the data, realize automatic production, improve production efficiency, and increase the economic benefits of the enterprise.

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