Verifying and Maintaining Accuracy Over Time
Make Sure Your Weighing Devices Remain Fit-for-Purpose
With its risk-based methodology, GWP® Verification helps maintain consistent quality and optimize costs by defining a performance verification plan specific to your business.
GWP® Verification assesses if the measured performance of your balance or scale satisfies your specific process and quality requirements. It documents the measurement range in which you can operate your equipment to achieve accurate and reproducible results. If a device does not achieve target performance, GWP® Verification recommends immediate measures to recover its accuracy.
Based on a risk assessment, GWP® Verification provides all necessary information for calibration frequency and routine testing. This includes:
- Service and calibration frequency
- Routine testing frequency
- Routine testing methods
- Routine testing weights
- Routine testing tolerances
- Audit-proof documentation
GWP® Verification Summary Report and Trend Chart
GWP® Verification includes an assessment for multiple weighing devices and comes with a unique summary report. This report gives you an overview of all your devices at one glance – including potential cost savings or quality improvements in your routine testing.
From your second GWP® Verification onwards, you will receive the GWP® Re-Verification Report. This includes a trend chart of your weighing device which allows you to keep track of its performance over time. This satisfies the highest demand for documentation and is also available for multiple devices (as a GWP® Re-Verification Summary Report).
Routine Testing of Your Balance or Scale
Over time, the performance of your weighing device can change due to environmental influences, wear and tear, and non-obvious damage. With routine testing performed by the user, you can check if it performs accurately enough according to your needs until the next calibration.
Are your weighing results accurate?
Only with a calibration, you can know how your device actually performs.
Do you know Good Weighing Practice?
Ensure consistent accuracy, quality and compliance of any weighing process.
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1. How long is a GWP® Verification valid?
GWP® Verification requires an update with every new calibration, change of process requirements, or change in operating environment. From your second GWP® Verification onwards, you will receive the GWP® Re-Verification Report. This includes a trend chart of your balance or scale, allowing you to keep track of the performance of your device over time. This satisfies the highest demand for documentation and is also available for multiple devices (as a GWP® Re- Verification Summary Report).
2. What is the basis for a GWP® Verification?
The GWP® Verification is based on an up-to-date calibration that documents the measurement uncertainty of weighing equipment in its actual environment.
3. What is the safe weighing range?
The safe weighing range is the range in which the balance or scale gives the most accurate results. This range lies between a scientifically calibrated lower limit (minimum weight determined through calibration) to which a safety margin is added (defined by the selected safety factor) and the maximum limit (capacity) of a balance or scale. Process quality requirements are met if the smallest net weight lies within the safe weighing range.
Since most manufacturers do not declare the lower limits of their devices, it's important to define your safe weighing range.
4. What is the minimum weight?
The minimum weight is the smallest load that can be weighed with a certain balance or scale that still lies within your accuracy requirements (defined by the weighing tolerance in %). It is defined by the relative measurement uncertainty of the device (in %) and your defined weighing tolerance (in %).
5. What is the smallest net weight?
The smallest net weight is the smallest amount of sample mass that the user intends to weigh during the day-to-day usage of the balance or scale; it is a user requirement and not an equipment property. If the smallest net weight equals or is larger than the minimum weight value determined for the required tolerance and safety factor, weighing results adhere to user requirements and are considered accurate.