The importance of instrumentation in the whole process of engineering projects. To achieve accurate measurement data, the correct selection of measurement instruments is very important. In the design stage, the important work is the selection of the meter, therefore, starting from the design stage of the meter. After the drawings of the preliminary design are released, organize the metrological professionals to review the drawings, divide the measuring instruments according to the control instruments and the handover instruments, and check the selection and measurement process of the instruments one by one according to the process conditions and the nature of the liquid medium according to different requirements Whether the instrument is equipped and selected reasonably.

       The measuring instrument is a very jingmi instrument. Only manufacturers with a very high technical level and certified by the national authority have the production capacity of measuring instruments. Therefore, to ensure the accuracy of measuring instruments, it is necessary to control from the source, and never allow recording instruments produced by companies without production capacity to enter the company. Therefore, we must control the procurement and actively intervene in the bidding stage, strictly select the suppliers in the bidding procurement, choose the best procurement, and ensure that the measuring instruments that enter the project are all proven reliable measuring instruments in practice.

       In the construction of the project, the suppliers selected through bidding are only a part of strengthening the measurement management, and whether the products provided by these suppliers are qualified or not, it is necessary to enter the verification work of the petrochemical company to ensure. Although the manufacturers of these measuring instruments have undergone strict selection, in order to ensure that the measuring instruments and measuring instruments installed on the device are all accurate, it is necessary to strictly check the entry into the company. Establish a strict management system for the purchased recording instruments, ranging from a thermometer, pressure gauge, pressure calibrator, to a temperature verification system, pressure calibration station, all need to be verified before entering the warehouse, only qualified can do Storage procedures, otherwise all returns will be processed. After strict on-board inspection management, the accuracy and reliability of the measuring instruments in use are ensured.

       It is also very important to ensure the accuracy of the measuring instruments and correct installation. If the installation is not carried out in strict accordance with the installation specifications, a very large measurement error will occur. Therefore, the organization of experienced measurement management personnel went to the site, inspected and supervised, and found that the problems in the installation were rectified in a timely manner; due to the timely proposal, the rework amount of the construction unit during the CCCC stage was reduced, with their active cooperation; With active cooperation, the inspection of metrology in the acceptance work of CCCC and before the start of construction all passed at once.