1. Necessary conditions for calibration or verification of measuring instruments
Enterprises and institutions must use a large number of measuring instruments in the provision of scientific research, production and services, especially in the inspection and testing process. Such as special calipers, micrometers, micrometers; scales for feeding materials in the production process, monitors for process monitoring, pressure vessels, pressure gauges on pressure pipelines, flow meters, and power meters for finished product testing; used for production and inspection Measuring instruments, as well as measuring instruments and computer software that are subject to mandatory verification, etc. According to clause 7.6 of the GJB9001A-2001 standard, there are two requirements: first, the measuring instrument is a device used in the monitoring and measurement process; second, the monitoring and measurement results of the measuring instrument can ensure that the product (or service) meets the determined requirements. Provide evidence. Calibration or verification is required only if the above two conditions are met at the same time.
2. The difference between calibration or verification of measuring instruments
"Calibration" and "verification" are two different ways and means to ensure accurate and effective measurement values. Calibration and verification are the same in terms of value traceability, but they are different in terms of legal effect. Requirement a) in clause 7.6 of the GJB9001A-2001 standard: Compared with measurement standards that can be traced to international or national standards, when necessary, measuring equipment should be calibrated or verified at specified intervals or before use. The word "or" in the standard determines the parallel and optional relationship between calibration and verification. On the premise of meeting laws and regulations, enterprises and institutions can choose verification or calibration methods according to different situations.
Calibration is a voluntary traceability behavior of enterprises and institutions and is not mandatory. Enterprises and institutions can perform calibration on their own or entrust external agencies to perform calibration. The result of calibration is a calibration certificate or calibration report. This report does not judge whether the measuring instrument is qualified or not, and is generally a technical document that does not have legal effect. Verification is a compulsory law enforcement act by the state. The verification results must determine whether the measuring instruments and equipment submitted for inspection are qualified or not. When the result is qualified, a verification certificate will be issued. If it fails, a failure certificate will be issued. The notification and test results are legally binding.
Measuring instruments that are subject to compulsory verification must meet two conditions at the same time: First, the instrument is included in the catalog of working instruments for compulsory verification by the state; second, the measuring instrument must be used for trade settlement and safety protection. , medical and health, and environmental testing for specific purposes. Measuring instruments used for purposes other than trade settlement, safety protection, medical and health care, and environmental testing, such as measuring instruments used for scientific research, production, and business management, can generally be managed and controlled as non-mandatorily calibrated measuring instruments.