MEXICO

(Federal Republic consisting of 31 states and one Federal District)
Surface area: 1 970 000 km2
Population: 81 249 645

1. LAWS OF METROLOGY

The legal ordinance governing metrology activities is the Federal Law on Metrology and Standardization issued by the congress on 1 July 1992. 
The Law has applications over all the national territory. The main subjects that it regulates in the metrological fields are: 

which is the National Calibration Laboratory Accreditation Program and

the Sistema Nacional de Acreditamiento de Laboratorios de Prueba (SINALP), which is the National
Testing Laboratory Accreditation Program and
the Centro Nacional de Metrologia (CENAM).

1.1 Legal requirements for traceability

The legal requirements for traceability in Mexico are those contained in the Federal Law on Metrology and Standardization.

2. LEGAL UNITS OF MEASUREMENT

The legal and mandatory units of measurement used in Mexico are those of the General System of Units of Measurement (NOM-008-SCFI-1993), according to the International System of Units (SI) and other units outside the SI, accepted by the General Conference on weights and Measures.

3. STRUCTURE OF METROLOGICAL CONTROL AUTHORITIES

3.l National organisation for legal metrology

Direccion General de Normas (DGN)
Av. Puente de Tecamachalco No. 6
Col. Lomas de Tecamachalco, Seccion Fuentes 53950
Naucalpan de Juarez, Estado de Mexico
Mexico
Telephone (525) 729 9481
Fax: (525) 729 9484
DGN is responsible for the following activities:
pattern approval of measuring instruments 
managing of the Sistema Nadonal de Calibracion (SNC) and
managing of the Sistema Nacional de Acreditamiento de Laboratorios de Prueba (SINALP), Sistema
Nacional de Acreditamiento de Unidades de Verificacion and Sistema Nacional de Acreditamiento de Organismos de Certificacion.
DGN has specific responsibilities to establish legal metrology regulations for trade easurement,
packaging and pattern approval. DGN also provides Mexican representation on OIML in the correspondent member status of the country, and coordinates the development of OIML international recommendations through Measurement Instruments Regulations.

3.2 Custodian of National Standards

Development and custody of all National Measurement Standards is, by law, responsibility of the Centro Nacional de Metrologia (CENAM), which is the primary laboratory in Mexico.
Centro Nacional de Metrologia (CENAM)
km 4, 5 carretera Los Cues,
Municipio de El Marques, Queretaro,
Mexico
Telephone: 91 (42) 16 6576
Fax: 91 (42) 16 2626

3.3 National organisation responsible for maintaining primary standards

CENAM is responsible for the custody and maintenance of the primary standards in Mexico (see clause 3.2.)

3.4 Regional and local verification organisations

The Procuraduria Federal del Consumidor (PROFECO), has the authority and responsibility for verification of measurement instruments subject to legal control (see clause 4).
DGN has responsibility and authority to accredit persons and institutions of public, private and educational sectors all around the country to give verification services of measurement instruments regulated by a mandatory standard.

3.5 Instrument calibration and evaluation systems

The Secretaria de Comercio y Fomento Industrial (SECOFI), through the Direccion General de Normas (DGN) is in charge of the Sistema Nacional de Calibracion (SNC).
The Accredited Calibration and Testing Laboratories are from the public, private and educational sectors which voluntarily decide to belong to the SNC or SINALP, so they can give calibration and testing services of measuring instruments, should present an application and the proper information about their organisation, personnel, installations, instruments, procedures and security conditions used in their metrological services they are evaluated according to established requirements based on international recommendations (Guide 25 ISO/IEC 1990).
All the accredited laboratories must have their measurement standards traceable to CFNAM.
DGN as the accreditor body follows the International Recommendation ISO Guide 58.

4. RANGE OF EQUIPMENT SUBJECT TO LEGAL METROLOGY

Every measuring instrument intended for use in:commercial trades or to determine the price of a service activities that may affect the life, health and human security and verification and calibration of other measuring instruments, must have a certificate of approval issued by DGN or other certification body accredited by DGN, Some examples are:

5. TYPE APPROVAL ( i.e. PATTERN APPROVAL)

5.1 Legal and technical requirements for type approval

Every measuring instrument and standard manufactured in Mexico or outside is enforced to legal control, and it requires, before sale, type or pattern approval and initial and subsequent verification.
A mandatory requirement for certification of a manufacturing instrument is to get a testing report given by & laboratory accredited by SINALP and even a calibration report from a laboratory accredited by the SNC.
The requirements for type or pattern approval of measuring instruments subject to legal control are contained in the Normas Oficiales Mexicanas (NOM) which are mandatory regulations for measurement instruments as mentioned in clause 4.

5.2 Authority responsible for issuing type approval

DGN has the authority for issuing type approval certificates of measurement instruments subject to legal control (see clause 5.1),

5.3 Recognition/acceptance of OIML certificates

Mexico does not maintain any agreement to recognise or accept OIML certificates.

5.4 Authority responsible for testing for type approval

The Direccion General de Normas (DGN), is the authority responsible for testing for type approval,
through out its National Testing Accreditation program (SINALP).

5.5 List of major test facilities available

At present, DGN has accredited 40 calibration laboratories and 90 testing laboratories in the following areas 

5.6 Fee structure

The fees generated by the certification is N$460 for each type of model.

6. VERIFICATION ICONFORMITY ASSESSMENTI, INSPECTION AND REVERIFICATION

6.1 Legal and technical requirements for verification and reverification

The Secretaria de Comercio y Fomento Industrial (SECOFI) through DGN may require from manufacturers, sellers or users of measuring instruments subjct to legal control, their verification or calibration when metrological inefficiences had been detected before sale or during their utilization.
SECOFI publishes in the Official Diary the list of measuring instruments whose initial, periodic or extraordinary verification or calibration should be required.

6.2 Range of equipment verified and reverified and any statistical information available

There is no statistical information at this moment due to recent changes in law.

6.3 Fee structure

Fees for verification and reverification vary upon the instrument nature:
Volumetric flasks, up to 30 L
N$7.63
Electronic and mechanical weighing instruments, up to 50 kg
N$15.37
Cylindrical weights from 1 mg to 10 kg
N$0.7637
Hexagonal weights from 5 to 100 kg, for each kg
N$0.1536
Hexagonal weights > 100 kg (each weight)
N$39.91

7. ACCREDITATION AND CERTIFICATION SYSTEMS

7.1 Accreditation systems for legal metrology, calibration and testing laboratories.

Traceability to national, regional, international or foreign measurement standards.
(a) For calibration laboratories
Sistema Nacional de Calibracion (SNC)
Structure and functioning
The Secretaria de Comercio y Fomenta Industrial (SECOFI), through the Direccion General de Normas (DGN) is in charge of the Sistema Nacional de Calibracion (SNC) which is the National Calibration Laboratory Accreditation program.
The SNC is integrated by:
Centro Nacional de Metrologia (CENAM) - the Primary Laboratory in Mexico.
(ii) The Metrology Laboratories accredited to provide metrological services with official recognition.
They are Metrology Laboratories from the public, private and educative sectors which voluntarily decide to belong to the SNC. Once they have presented their application and the proper information about their organisation, personnel, installations, instruments, procedures and security conditions used in their metrological services, they are evaluated according to DGN requirements, as they are issued in the Evaluation Guide.
(iii) Experts in the matter who conform the Evaluation Committees.
They are conformed by the commercial representatives of the accredited Metrology Laboratories and Persons, technician and professionals in metrology from DGN, CENAM or institutions dedicated to metrology. Their mission is to collaborate with the SNC.
A Metrology Laboratory or Person who wishes to be accredited as technically competent and join the SNC should follow these recommendations:
General Guidelines to evaluate the technical competence of a Metrology Laboratory, document SNC-2-1994 (reference ISO-IEC GUIDE 25-1990-General Requirements for the technical competence of testing laboratories).
(b) For testing laboratories 
Sistema Nacional de Acreditamiento de Laboratorios de Pruebas (SINALP).
For legal metrology laboratories
Sistema Nacional de Acreditamienta de Unidades de Verlficacion

7.2 Legal and applied metrological activities in products certification

Agencies of the Federal Government according to their attributions or the Certification Bodies accredited by DGN, will certify for official purposes that those determined processes, products, methods, installations, services or activities comply with established specifications in mandatory standards,
SECOFI in coordination with other agencies of the Federal Government establish the characteristics of official marks and countersigns that products subjected to fulfillment of a mandatory standard must have. These products must show the countersign denoting such fulfillment. If it cannot be fixed on the product itself, it can be done on one of their containers, packaging, labels or wrapping.
SECOFI will authorize the use of official marks and countersigns to those persons who demonstrate to fit the requirements marked in the Federal Law on Metrology and Standardisation or the respective mandatory standards.

7.3 Legal and applied metrological activities in ISO 9000 quality management systems

Mexico has adopted the ISO 9000 standards as the NMX-CC series. The International organisation for Standardization (ISO), recognised the national series NMX-CC as equivalent to ISO 9000 series.
Some examples are:
ISO 8402/1986 ISO 9000/1987 ISO 9001/1987 ISO 9002/1987 ISO 9003/1987 ISO 9004/1987
NMX-CC-1 -1 993 NMX-CC-2-1 990 NMX.CC.3-1 990 NMX.CC-4.1 990 NMX-CC-5-1 990 NMX-CC-6,1 990
Further revisions of ISO 9000 series (ISO 9004-1 and ISO 9004-2, for instance) are being actualized now under our corresponding standard.

8. LEGAL METROLOGY PRACTITIONERS

8.1 Numbers

The metrology area in DGN is conformed by six engineers and fourteen technical employees. Their activities vary from accreditation of calibration laboratories, metrological standardization and the National Conference on weights and Measures in Mexico (actually as a project).

8.2 Qualification/training

The qualification of the technical employees in the metrology area are in the fields of engineering. 

8.3 Training organisations and courses organised

CENAM and DGN provide training courses in the whole metrological field. 

8.4 Range of functions

DGN Industrial and legal metrology and
CENAM Industrial and scientific metrology.

9. PACKAGING

9.1 Legislative control for packaging

In Mexico there are only provisions about tolerances for prepackaged products. The specific requirements are established in the Federal Law on Metrology and Standarization published in 1992, and particularly in the National Standard NOM-002-SCFI-1993 prepackaged products - Net content - Tolerances and Verification Methods which is a mandatory standard.

9.2 Organisation responsible

There are two organisations responsible for the control of packaging. They are:
Direccion General de Normas (DGN), and
Procuraduria Federal de Consumidor (PROFECO).

10. SANCTIONS

Non fulfillment of regulations as established in Federal Law on Metrology and Standardization and other dispositions derived from it, will be admini5tratively sanctioned according to verification reports made by accredited laboratories.
The applicable sanctions are the following:
Fine up to total of 20 000 times the minimum general daily salary effective in the Federal District from the moment that the infraction is made. When the infraction persists, fines can be imposed for each day elapsed.
Temporary or definitive suspension that could be partial or total.
Arrest up to 36 hours.
Accreditation suspension and revocation. 
In all cases of repetition the imposed fine will be double the previous infraction, without in each case the total amount exceeding double the maximum fixed in the previous article.

Return to Index page