We have seen the following mark on the products and packaging of many pressure transmitters, which is the type approval mark of the measuring instrument, also known as the CPA mark. The type approval of domestic measuring instruments refers to the recognition of whether the type of measuring instrument products meets the requirements of the legal system, and the type approval certificate issued by the metrology administrative department of the State Council can be used as a national general type, and the use of CPA special marks and numbers for the type approval of measuring instruments is allowed on the corresponding measuring instruments and packaging. The pressure transmitter used in our industrial production is a measuring instrument. A pressure transmitter is an instrument that converts a pressure variable into a standardized output signal that can be transmitted, and there is a continuous linear function relationship between the output signal of the pressure transmitter and the pressure variable. It is mainly used for measuring pressure parameters in industrial processes. The signals output by the pressure transmitter are mainly direct current signals and voltages. Its components include a pressure sensing unit, a signal processing and conversion unit. Some pressure transmitters also have an additional display unit. The application and approval of the form approval certificate for pressure transmitter measuring instruments is a very rigorous and complex process. A range of relevant data is required from the pressure transmitter manufacturer. It not only includes samples, manuals, product standards, assembly drawings, circuit diagrams and main component drawings of pressure transmitters. It also includes a series of complex data related to the experimental test report of the pressure transmitter. The CPA measuring instrument type approval mark is composed of two parts, and the first two digits of the first half are the approval year when the certificate is obtained; The third symbol in the second half indicates the class number of the measuring instrument, and the fourth, fifth, and sixth digits indicate the approved sequential number (starting with 101). For example, the General Administration of Quality Inspection and Quarantine of the People’s Republic of China issued the No. 166 mechanical measuring instrument type approval certificate in 1999 and the approval number is CPA 99-F166. If you have any questions about product consultation, product customization, agency, technical inquiry, quotation, etc., please contact Xingyi, 400-600-4496!