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.
Scientifically, transparently, exactly. GWP® can be applied to all balances and scales of all brands and models.
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:
Understanding your weighing process
The GWP® standard helps you in evaluating your weighing requirements in a simple and objective way.
- Use a clear set of criteria to document metrological, environmental and regulatory requirements.
- Receive a GWP® Recommendation that summarizes your require-ments in one piece of documentation.
for perfect quality
You select the right balance or scale meeting your weighing requirements - not more, not less.
- Purchase only equipment with a suitable accuracy to meet your process and quality requirements
- Environmental and regulatory factors are considered before the purchase
Professional installation, and qualification of the weighing system along with in-depth user training ensure trouble free weighing right from the start.
- Immediate readiness of users and instruments from day one
- Documentation traceable to national or international standards
Confidence in having the relevant documentation
Document the measurement uncertainty and minimum weight of your weighing equipment to assess its performance on site.
- Assurance that balances and scales weigh within process tolerances
- Audit-proof documentation
Optimized testing minimizes risks and costs
A risk-based test scheme allows you to invest resources where it really matters.
- Clear recommendations for routine test methods, test frequencies, test weights and pass/fail limits
- Only perform meaningful tests and reduce unnecessary efforts
- White Paper: GWP - The Standard Science Based Weighing
- White Paper: Avoiding OOS
- Publication in NCSLI Measure: GWP - Efficient Lifecycle Management
- Educational Paper: Minimum Weight/Safety Factor
- Educational Paper: Quality Assurance
- Educational Paper: Performance Verification
- Educational Paper: Routine Testing
- Educational Paper: Reducing Costs