Zero and tare
Confirm the empty pan, hopper or pack support returns to a stable zero before product testing starts.
Guide
How should a weigh filler be checked with reference weights?
Reference-weight checks help confirm that the weighing system is behaving consistently, but they do not replace a product trial, legal-metrology advice or a documented quality procedure for the actual packaged goods.
Buyer guidance
Separate machine checks from product acceptance checks.
A reference weight can prove the load cell and controller are reading a known mass in a known condition. It does not prove that a dusty powder, bouncy granule or fragile product will fill consistently at production speed.
Known reference weight
Use reference weights that suit the measuring range and are controlled by the site quality process.
Location and vibration
Run checks where the machine will operate, because floor vibration, air movement and conveyor contact can change stability.
Product verification
Follow reference-weight checks with consecutive product fills into the real pack where possible.
Records
What should be recorded during routine checks?
A useful record should make it clear what was checked, when, by whom and what happened if a value was outside the agreed tolerance.
Machine identification, recipe name and target weight.
Reference weight or test load used, including the site reference number where applicable.
Zero, tare and displayed reading before product is introduced.
Any adjustment made to the target, feed cut-off or recipe.
Finished-pack sample results after the reference check.
Operator name, time, batch, product and corrective action where needed.
Buyer guidance
Where legal quantity control may apply.
For regulated packaged goods, the packer is responsible for the quantity-control system and records. The machine can support that process, but the production procedure and checking regime must be agreed for the actual products being packed.
UK packaged-goods guidance explains average-system and minimum-system approaches and says suitable equipment and records are required for checks. Lancing can help specify a machine route and checkweigher interface, but buyers should confirm legal-metrology requirements with their own competent adviser or Trading Standards where required.
Buyer guidance
Questions buyers ask about weigh filler calibration.
These questions often decide whether the issue is a machine setting, a test method or the product itself.
Is calibration the same as product accuracy?
No. Calibration or reference checking confirms the weighing system against a known mass. Product accuracy also depends on feeder control, product flow, settling time, cut-off, pack tare and how the product behaves during discharge.
Do I need a checkweigher as well as reference weights?
A checkweigher is often useful when finished packs need independent confirmation after filling, sealing or handling. Reference weights check the weighing device; a checkweigher checks the finished pack in the production path.
How often should a weigh filler be checked?
The interval depends on the site quality system, product value, legal requirements, operator changes and process risk. Many buyers define checks at start-up, changeover, after adjustment and at planned intervals during production.
Related support
Related weigh filling guides.
Use these pages to connect this decision with machine route, samples, accuracy and support.
Send product, pack and output details.
Include the product, target weight, pack format, available space, existing equipment and any samples or drawings. Lancing can then advise which weigh filling route is worth testing.