Available weighing time
The product must enter, settle, be measured and leave the weigh belt before the next pack interferes.
Technical selection guide
Checkweigher accuracy: specify and test real line performance
Display resolution is not the same as dynamic accuracy. Useful performance depends on the product, conveyor, environment, speed and the method used to prove repeatability.
01Product-specific testing
02Dynamic repeatability
03Agreed acceptance method
Short answer
What determines checkweigher accuracy?
Dynamic accuracy is determined by the complete measurement process: product stability, time on the weigh conveyor, belt and transfer behaviour, vibration, air movement, load-cell selection, filtering and line speed. The only useful claim is one tied to a defined product and operating condition.
Project decisions
What the final scope needs to define
Pack stability
Liquids slosh, pouches flex, tall bottles oscillate and loose contents move, changing the load-cell signal.
Belt transfers
Step changes, gaps, belt tension and grip can excite or tip the pack immediately before measurement.
External disturbance
Nearby machinery, floor vibration, conveyor contact and air movement can introduce measurement noise.
Filtering and recipes
Product-specific filtering can improve classification but must remain responsive at the required speed.
Reference method
A controlled sample set and agreed statistical method separate machine repeatability from pack variation.
Specification language
Resolution, repeatability and accuracy are not interchangeable
- Scale interval: the smallest displayed increment; it does not prove the uncertainty of a moving pack result.
- Repeatability: how closely repeated measurements agree under defined conditions.
- Dynamic performance: classification achieved with the actual product moving at the stated rate.
- Reject limit: the decision boundary, allowing for process variation and measurement uncertainty.
- Capability trial: practical testing with representative good packs and known differences.
Application-led engineering
Test the real product before relying on a tolerance.
Representative samples and a line video help establish a realistic measurement window before final specification.
Discuss your applicationCommon questions
Dynamic checkweigher FAQs
Is display increment the accuracy?
No. Displayed increment is resolution. Dynamic performance must be demonstrated with the real product at the required speed.
Why does speed affect accuracy?
Higher speed reduces measurement time and can increase pack movement. Throughput, spacing and settling time must be balanced.
Can accuracy be quoted before testing?
An indicative range may be possible, but a dependable commitment should use representative samples and a defined acceptance test.
Checkweigher buyer resources
Plan performance, cost and compliance before choosing a machine
Practical answers for engineering, production and quality teams preparing a UK checkweighing project.
01
Price & cost guide
Understand quotation scope, cost drivers and total installed project value.
Plan a budget →02Accuracy guide
Compare dynamic performance claims using the real pack at line speed.
Define performance →03Buying guide
Build a requirement covering handling, rejects, data and acceptance.
Choose a system →04UK compliance
Connect quantity control, records and corrective action to the line.
Review compliance →Your application, properly defined
Let’s specify the checkweigher your line needs.
Share pack details, target weights, line speed and any inspection or data requirements.