Who is more authoritative, CNAs or CMA? Difference between metrological certification and laboratory accreditation

Date：2022-05-10 17:56:00Views：1503

We often see CMA and CNAs marks on some test reports. CMA measurement certification and CNAs laboratory accreditation are commonly used as certification for test reports. There are both similarities and differences between them. In order to help you solve this problem, this paper will summarize CMA measurement certification and CNAs laboratory accreditation. If you are interested in what this article is about to cover, you might as well read on.

Meaning of CMA and CNAs

CMA means China Metrology Certification（CMA logo indicates that the institution has passed the metrological certification of the metrological administrative department of the people's government at or above the provincial level.

The Metrology Law of the people's Republic of China stipulates that product quality inspection institutions that provide notarized data for the society must pass the assessment of their metrological verification, testing ability and reliability by the metrological administrative department of the people's government at or above the provincial level. This assessment is called metrological certification.

CMA metrological certification is generally only for third-party laboratories. Testing institutions that have obtained certification are allowed to use CMA logo on the inspection report. The report can be used for product quality evaluation, achievement and judicial appraisal, and has legal effect.

CNAs means China National Accreditation Service for conformity assessment.

The CNAs logo indicates that the organization has passed the accreditation of China National Accreditation Commission for conformity assessment and has the technical ability to carry out testing and / or calibration services in accordance with relevant international accreditation standards. CNAs accreditation is a voluntary accreditation system. The scope of accreditation includes first-party, second-party and third-party laboratories. The reports issued by the accredited laboratories can be recognized by the National Laboratory Accreditation Commission of China (CNAs) and the International Laboratory Accreditation Cooperation Organization (ILAC) by the national and regional accreditation institutions that sign the mutual recognition agreement.

Difference between CMA and CNAs

CMA metrological certification is mandatory and CNAs laboratory accreditation is voluntary. According to the Metrology Law of the people's Republic of China, in order to ensure the accuracy and impartiality of test data, all quality testing institutions that issue notarial test reports to the society must obtain the qualification of "metrology certification", otherwise it will constitute an illegal act. CMA measurement certification is a Qualification Authorization and an access certificate for third-party testing institutions to enter the market. CNAs laboratory accreditation can enhance the market competitiveness of institutions, win the trust of government departments and all sectors of society, and improve the popularity and authority of institutions.

CMA metrological certification is with Chinese characteristics, and CNAs laboratory accreditation is internationally recognized. CMA measurement certification is a domestic standard. The report issued has legal effect in China and requires the institution to have independent legal personality.

CNAs laboratory accreditation is an international standard (ISO / IEC 17025), and the reports issued are internationally recognized.

Then it introduces the differences between CMA measurement certification and CNAs laboratory accreditation from the following aspects: purpose, legal basis, review basis, nature, review object, type, implementation organization, assessment content, assessment results, application scope and characteristics.

1. Different purposes

CMA measurement certification is to evaluate the management level and technical ability of measurement institutions of independent legal entity. CNAs laboratory accreditation is the evaluation of the management level and technical ability of measurement institutions for laboratories.

2. Legal basis

CMA measurement certification is based on Article 22 of the measurement Law of the people's Republic of China; CNAs laboratory accreditation is based on GB / T 27025-2008 (equivalent to ISO / IEC17025:2005)

3. Review basis

The evaluation basis of CMA measurement certification is the evaluation criteria for laboratory qualification (modified by ISO / IEC17025:2005); The evaluation basis of CNAs laboratory accreditation is CNAs / cl01:2006 criteria for accreditation of testing and calibration laboratories (equivalent to ISO / IEC17025:2005)

4. Nature

CMA measurement certification is mandatory; CNAs laboratories consider it voluntary.

5. Review object

CMA measurement certification is a third-party testing / calibration laboratory that provides fair data to the society; CNAs laboratory is recognized as a testing / calibration laboratory from all walks of life.

6. Type

CMA measurement certification is recognized by the national and provincial levels; CNAs laboratories are accredited by national laboratories.

7. Implementing agency

CMA measurement certification shall be implemented by the quality supervision department above the provincial level and the national CMA measurement certification industry review team; CNAs laboratory accreditation is implemented by China National Accreditation Commission for conformity assessment (CNAs).

8. Assessment content

The assessment contents of CMA measurement certification are implemented in accordance with the criteria for accreditation and review of laboratory qualification (19 elements), which adds 19 special requirements compared with laboratory accreditation (ISO / IEC17025:2005); The content of CNAs laboratory accreditation assessment shall be in accordance with the criteria for accreditation of testing and calibration laboratories (CNAs / cl01:2006) (equivalent to ISO / IEC17025:2005) (25 elements)

9. Assessment results

CMA metrological certification uses CMA mark, and the assessment results are issued with metrological verification certificate, which has legal effect; The CNAs laboratory recognizes that the CNAs mark is adopted, and the calibration report is issued according to the assessment results. It is not required to give a qualified or unqualified judgment.

10. Application scope and characteristics

CMA measurement certification can provide fair data within the scope of recognition, which is commonly used in China; CMA measurement certification is a common international practice. CNAs has signed a mutual recognition agreement (aplac-mra) with the Asia Pacific Laboratory Accreditation and the international laboratory accreditation organization, but it can not replace the review, accreditation and qualification.

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