Absolute dry goods! Instrument calibration and common knowledge! -Huaqiang Electronic Network

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Absolute dry goods! Instrument calibration and common knowledge!

Metrology is a science of scientific measurement. Although the manufacturer is responsible for production, calibration, and compliance with equipment requirements, the metrology laboratory must verify the accuracy of the instrumentation in the manufacturer's instructions. Record and store test data with a professional test station equipped with a dedicated control system and real-time database. The control system regulates the test station and performs it in precise steps one by one to verify the accuracy in the manufacturer's instructions. The control system must also document each test in detail and evaluate each meter calibration. Measurement is an important guarantee for product quality. Measurement is the ultimate technical means to objectively evaluate the quality of products. Measurement and calibration is the main technical measure to control the process parameters of production process and ensure the quality of processing. Metering and calibration, as an important part of ISO9001 certification and auditing, has been increasingly valued by the factory.

Calibration laboratory

We met many customers. Because the company did not fully evaluate the qualifications, capabilities and technical matching of the organization when it selected the calibration service, it was misled by some measurement organizations or over-emphasized the calibration costs. The measurement mechanism, on the one hand, has lost the quality of the data because of the lack of scientific data. On the other hand, because the calibration result is not recognized by the relevant auditing organization or customer, the order is lost. The loss is not heavy. The lesson is not Big!

From the standpoint of the company, how to choose a measurement institution? The following three aspects are important: the qualifications and capabilities of the measurement organization, the equipment resources and parameter accuracy of the measurement organization, and the service level and cooperation of the measurement organization.

1. Qualification and accreditation items of the measurement institution:

See if it has obtained CNAS accreditation and other aspects of certification;

Second, see if its CNAS accreditation project covers the scope of calibration of your company's instruments. It is also a CNAS accreditation certificate, but the corresponding scope of accreditation is more or less;

Third, see if the technicians have calibration qualifications; now the system external audit and customer auditing are paying more and more attention to whether there is CNAS LOGO on the calibration certificate. The certificate without CNAS LOGO is equivalent to a common certificate or report. The result is not Has credibility.

Fourth, look at its registered capital. The registered capital of some metrology institutions is only a few hundred thousand yuan. It must be considered that if you lose or damage your valuable equipment, can you afford it?

2. Equipment resources and parameter accuracy of the measurement institution:

Look at the list of equipment, with those instruments and standard parts, whether to cover your instrument requirements;

Second, see if its parameters meet the technical accuracy requirements of your instrument.

3. The service level and cooperation degree of the measurement institution:

A look at the reports provided, the parameters to be calibrated, the points/channels are fully compliant with the verification procedures;

Second, look at the qualifications, professional titles and scientific research capabilities of their technical staff;

Third, look at the service period, can provide on-site calibration, instrument delivery, expedited services and other ancillary services;

Fourth, can you provide one-stop services, such as subcontracting, maintenance, training, consulting, product testing, certification agents, etc.;

Fifth, see if the program files are complete, such as “Complaint Handling Procedures”, “Control Procedures Not Complying with Testing and Calibration Work”, “Improved Control Procedures”, “Corrective Action Control Procedures”, etc.

In addition, in accordance with Articles 11 and 12 of the Rules for the Implementation of the Measurement Law of the People's Republic of China, and the Announcement of the State Administration of Quality and Technical Supervision on the Non-Strong Inspection Instruments Used by Enterprises for Self-management by Enterprises, General Factory Instrument calibration is a traceability activity from the perspective of quality control. It is not a mandatory verification activity of the state (not subject to the strong inspection of trade settlement, safety protection, medical care, environmental testing, etc.), so your company has the right to freedom. Choose government or other calibration agency services, not government enforcement.

The original records of enterprise measurement work mainly include:

(1) Measurement instruments (including standard instruments) used by enterprises, verification records of inspection equipment, calibration, maintenance records, certificates of conformity and test reports;

(2) Various types of measurement and test records, original report records;

(3) Main process control and product quality main parameter test records.

Enterprises should also establish measurement management and technical files. There are:

(1) Inventory of institutions and personnel;

(2) Metering instrument account;

(3) Metering instruments are issued and borrowed;

(4) Annual (month) measurement work plan and summary;

(5) Measurement standards and instrument technical data (including random technical documents);

(6) Self-designed quantities, inspection patterns, technical documents, etc.;

(7) Documents issued by the superior measurement department;

(8) Various types of history cards (measuring device resume cards), etc.

Where measuring standards and large-scale precision measuring instruments and inspection equipment, it is necessary to establish files according to the table (pieces). The file should be equipped with: instructions for measuring instruments, verification (or calibration) certificates, history cards, repair records, various types of measurement standards, and maintenance records.

The measurement management, technical files and original records of the enterprise shall be designated by a person (or) responsible for the safekeeping. It also has a system of custody, borrowing, and returning, and specifies the period of custody and methods of destruction.

Measuring instrument calibration procedure

Some of the more calibrated units of the instrument are easy to manage, taking a prominent focus and taking into account the general ABC classification management method.

A. Class measuring equipment, although the amount is not much, but the location and use of the use is very important, as the key management.

B. Class measuring equipment, the number is relatively large, but the degree of accuracy and the importance of the position are not high, and general management can be performed.

C. Class measuring equipment, the number is also relatively large, but basically some monitoring instruments, the accuracy level is low, take a one-time verification or calibration method when confirming, replace after damage, do not implement periodic verification, you can briefly Management.

ABC class management is currently widely used in enterprises, such as combined with tag management to identify, just mark the marked A, B, C on the mark.

The classification methods for A, B, and C management are:

(1) Class A measuring equipment

The highest measurement standard of the enterprise and the measuring equipment used for the transmission of the value, the social public measuring instruments certified and authorized, and the work measuring equipment included in the mandatory verification catalogue.

The company is used in process control, quality inspection, energy and operation management, and has high requirements for measurement data.

Measuring equipment with high accuracy and frequent use and poor reliability.

(2) Class B measuring equipment

The production process control and quality inspection of the enterprise have measurement equipment requirements for measurement data.

Measuring equipment for energy and material management used for internal accounting.

Fixedly installed on the production line or device, the measurement data is high, but the measuring equipment that is usually not disassembled and the actual calibration cycle must be synchronized with the equipment maintenance.

There are certain requirements for accurate and reliable measurement data, but measurement equipment with long life and high reliability.

The measurement performance is stable, the indication value is not easy to change, and the measurement equipment is infrequently used.

Dedicated measuring equipment, measuring equipment that limits the range of use, and measuring equipment used for fixed pointing points.

(3) Class C measuring equipment

In the production process, quality inspection, operation management, energy management, and fixed installation on the process production line and equipment, it is not easy to disassemble and has no strict accuracy requirements, and only the indication measuring device with the display function and no quantity requirement .

Measuring equipment with stable measurement performance, high reliability and infrequent use, and whose value is not easy to change.

The National Metrology Administration has mandated one-time use (eg, glass ruler calibration) or metering equipment (eg water meters) for effective period management.

Further reading: What qualifications do third-party calibration agencies need?

The most important thing for third-party calibration organizations is CNAS, which is the basis for third-party calibration organizations. There are two types of laboratories accredited by CNAS. One is the calibration laboratory, which is issued with the Certificate of Calibration. The seal stamped on the certificate is the “Specification Seal”. The other is the testing laboratory, which is issued with the "Test Report" or "Test Report". The seal stamped is the "Special Seal for Inspection". Both CNAS-approved laboratories are capable of instrument calibration and their reports are approved by the auditor.

Dongguan WorldCom Instrument Testing and Calibration Center covers an area of ​​6 acres, with a laboratory area of ​​1,200 square meters. The calibration source is complete, with a large number of imported high-end instruments such as Fluke, Hewlett-Packard, Agilent, Jushui, Xintian, etc., covering a wide range of calibration and testing. The center is equipped with professional calibration testing laboratories such as mechanics, length, scales, electricity, electromagnetics, thermal engineering, geometric quantities, and light workability. This calibration and testing center can calibrate and test national instruments and related products in the above categories and issue internationally recognized calibration certificates or test reports.