What certificates do instrument calibrators need?

A training completion certificate issued by the Quality and Technical Supervision Bureau is required

It is not a type of verification or calibration aimed at traceability of measurement values, and no certificates are required; however, an internal training certification for working on such tasks is still necessary

Those who only know that pressure gauges and pressure switches need to be calibrated hold certificates, but they don’t know which department issues them.

Process instruments can be used as long as there is an operation permit； Gauge pressure meters, combustible gas detectors, metering devices, etc., are instruments that require mandatory inspection; as long as the certification is still valid within its inspection period, they can be calibrated prior to installation with an operation permit. If it exceeds the limit, relevant qualifications must be obtained or the item must be sent for inspection before installation.

Calibrating normal production instruments isn’t a problem, but when it comes to issuing calibration or verification certificates, the verifier must possess the appropriate certification. Additionally, you need to establish a standard metrology verification laboratory and obtain the corresponding metrological standard certification. Individuals can obtain certification as verifiers for relevant tasks; nothing else is necessary

3. Are there any specialized exams or certificates related to metrology, and how exactly are they obtained? Managers are not clear on this, but personnel responsible for testing measuring instruments must possess qualified certificates. These certifications are classified by areas such as electricity, mechanics, etc.; there are also specialized categories for tools used in tasks like repairing pressure gauges and balances. Each category has its own set of requirements for qualifications. In general, the scope of these qualifications can be defined manually, but relevant training must be completed by qualified departments or authorized organizations before certificates can be issued. As for which departments are authorized to issue certificates, it is necessary to consult the local metrology supervision authorities (at the county or city level); for example, in my area, this is the Nanjing Metrology Supervision Bureau and Nanjing Zijin Metrology Co., Ltd. I am using the qualification for on-site instrument maintenance issued by the Jinling Petrochemical Metrology Supervision Station, authorized by the Provincial Metrology Center, and which is valid only for use within Sinopec enterprises. The above information is taken from Zhihu.