The Role of Legal Metrology in Modern Weighing Inspection Systems

The Role of Legal Metrology in Modern Weighing Inspection Systems

Introduction to Legal Metrology in Industrial Weighing

Legal metrology forms the foundation of trustworthy weighing inspection systems in modern manufacturing and

trade environments. As global supply chains become more complex and regulatory requirements more stringent,

the integration of legal metrology principles into weighing systems has evolved from simple compliance to a

strategic quality assurance imperative.

Core Principles of Legal Metrology in Weighing

1. Metrological Traceability

• Definition: Unbroken chain of calibrations to national/international standards

• Implementation:

  • NIST (USA), PTB (Germany), or NIM (China) traceable certification

  • ISO/IEC 17025 accredited calibration procedures

  • Documentation of measurement uncertainty budgets

Industry-Specific Implementations

Pharmaceutical Manufacturing

• Critical Parameters:

  • USP <41> compliance for balances

  • 21 CFR Part 11 electronic records

  • Measurement uncertainty ≤0.1% of tolerance

• Validation Protocol:

  • 3-point calibration (min, nominal, max)

  • 99.7% confidence level (3σ)

Retail Weighing Systems

• Key Requirements:

  • Automatic price calculation verification

  • Zero-tracking within ±0.25e

  • Mandatory sticker printing accuracy

• Inspection Frequency:

  • Initial verification

  • Annual surveillance

  • 2-year recertification

SMARTWEIGH INSTRUMENT CO.,LTD , established over 15 years, which is one of the largest manufacturers and exporter in China. Our workshop occupy 20,000 square meters and located in a very convenient and beautiful city, Changzhou, it is close to Shanghai and only take one hour by high speed railway.

  Our company have advanced production equipments like Bending machine, pre-arch machine, shearing machine, qutomatic welder, automatic welding robot, plasama cutting machine, and baking paiting room, to help us increase the product quality and  production productivity  Our company also have the senior technician team and design team. Many products have been applied  patents. 

  Under the advanced test equipement, technical workers and rich experice, we manufactured high qualified truck cales, platform scales, bench scales, crane scales, highway axle scales, as well as spare parts like indicators and loadcells. We have exported to RUSSIA, KSA, USA, UK, HOLLAND, SPAIN, ITALY etc many different kind of countries, our good quality and timely delivery has attracted over 200 long term distrbutors all over the world.

Our yearly export collection amount keep about 5000,000 to 10000,000 USD, among of this, our project for the foreign railway, highway and government is the majority. By the way, We can supply both ODM and OEM design also.

  Our company havs been awarded ISO 9001, CE, SGS, OIML cetificate for our products, all weighing scales are 

pre-calibrated before shipping, We deicated to the spirit of " Quality come first forveve and technology detemines the productivity"since extablished, and we have benifited from it and quietly brilliant for over 15 years.

More and more wonders and brilliant future will be made be by SMARTWEIGH!