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Standard 1: Metrological guidelines, such as OIML R76-1 and HB44, define the minimum requirements for an approved weighing device. Considering that their purpose is just to set a legal framework to commercial transactions, they lack the guidance you need for your specific process requirements.
Standard 2: Quality standards such as, ISO, GMP, GLP, USP, HACCP, GFSI based and others, require continuous equipment monitoring. For example, ISO 9001 states: “Measuring equipment shall be calibrated or verified, or both, at specified intervals…" Because of its generic scope, however, ISO does not give you any specific information on its implementation .
Standard 3: GWP® documents that the weighing equipment fulfills the measurement accuracy requirements on the basis of on-site calibration and measurement uncertainty determination. This closes the gap left open by OIML/HB44. Furthermore, GWP® helps you determine the specific methods and frequency of the regular calibration and verification tests required by the quality standards (ISO, GMP, GLP, etc.).
A GWP® certification provides an audit trail, proving that you comply with both external requirements and your (often more demanding) internal quality management (e.g. six sigma and lean manufacturing). GWP® helps you build exact metrological standards while ensuring that your resources are invested only in appropriate activities. Not more. Not less.
METTLER TOLEDO offers two unique service products based on GWP®:
The GWP® risk-based methodology covers the entire life cycle of a weighing device in five steps:
The GWP® standard helps you in evaluating your weighing requirements in a simple and objective way.
You select the right balance or scale meeting your weighing requirements - not more, not less.
Professional installation, and qualification of the weighing system along with in-depth user training ensure trouble free weighing right from the start.
Document the measurement uncertainty and minimum weight of your weighing equipment to assess its performance on site.
A risk-based test scheme allows you to invest resources where it really matters.