Reject verification confirms that underweight and overweight packs leave the accepted stream reliably. Define challenge packs representing weight and size extremes, test threshold decisions at line speed and spacing, verify physical removal and confirmation signals, and test fault conditions through qualified personnel. Document classifications, reference values and all interventions.
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Establish challenge packs and reference measurement
Prepare test packs spanning the minimum, target and maximum weights plus deliberate underweight and overweight samples. Use actual product or equivalent representative samples matching pack dimensions, bottom surface and internal motion. Measure each challenge pack using a traceable reference method independent of the checkweigher under test and record its identifier and reference weight. Ensure samples remain stable throughout the trial period and re-verify reference weights if product settles or evaporates. The reference measurement establishes truth for classification decisions; the checkweigher display alone does not validate itself.
Identify which packs should be accepted and which should be rejected according to the agreed decision thresholds. Challenge the lower and upper limits specifically rather than assuming performance between tested points. Record ambient conditions, line speed and pack spacing during the reference-weight determination so the dynamic test uses comparable conditions.
Test threshold decisions at production conditions
Run challenge packs through the checkweigher at the agreed conveyor speed and minimum spacing. Feed underweight, target-weight and overweight samples individually and in sequences that represent production patterns, including consecutive rejects. Record the checkweigher classification decision and compare it to the reference measurement for each challenge pack. A missed underweight or accepted overweight pack indicates a threshold, timing or tracking error that must be resolved before acceptance.
Test edge cases near the decision boundaries with multiple samples to confirm repeatability. Verify that the system correctly handles packs arriving with irregular spacing or minor position variation within the available conveyor width. Include startup, recipe changes and power restoration in the protocol if these events occur during production shifts. The Techik IXL-H high-speed checkweigher family is described as a system with high speed, high sensitivity and high stability dynamic weight checking [S1], but dynamic performance must still be verified on the actual installed system with real product at the specified line conditions rather than inferred from catalog specifications.
Verify physical rejection and confirmation
Observe that rejected packs physically leave the accepted product stream and reach the designated reject collection point. Confirm that the rejection mechanism actuates reliably for consecutive rejects without jamming or failing to reset. Check that the system signals or logs each rejection and that this confirmation matches the observed physical removal. A classification decision without verified removal is not a complete reject test.
Challenge the reject mechanism with the heaviest and most fragile packs in the product range to confirm it can handle extremes without damaging product or creating a blockage. Verify reject-bin or reject-conveyor capacity and test the system response to a full reject container if this interlock is included. Document whether a failed reject signal stops the line, triggers an alarm or allows unrejected out-of-specification packs to continue, and confirm this behavior matches the agreed specification.
Test fault conditions and recovery
Simulate loss of reject-actuator air supply, a blocked reject path or a full reject bin through controlled tests supervised by qualified personnel. Verify that the system detects these faults, provides clear indication and either stops the line or diverts all product to an inspection hold point. Test that normal operation resumes correctly after the fault is cleared and that no packs were released without proper weighing and rejection during the fault or recovery period.
Include communication faults if the checkweigher depends on upstream product signals or downstream acceptance confirmation. Document the system behavior for each tested fault and compare it to the agreed interlock and alarm specification. Retain fault logs and operator actions as part of the acceptance evidence.
Buyer decision worksheet: Reject verification scope
| Buyer input | Decision point | Evidence to request |
|---|---|---|
| Target weight and decision thresholds | Which challenge packs should be accepted vs rejected | Written thresholds, reference measurement method, traceable test weights |
| Minimum, maximum and edge-case pack weights | Challenge-pack selection covering full production range | Representative product samples, reference weighing record, pack identifiers |
| Line speed and minimum spacing | Test conditions matching production rather than static trials | Conveyor speed confirmation, timing or spacing measurement |
| Pack stability, bottom surface, internal motion | Use actual product or equivalent samples, not idealized test blocks | Sample retention, stability notes, handling protocol |
| Reject mechanism and confirmation method | Physical removal verification, not display decision alone | Observed reject path, confirmation signal or log, consecutive-reject test |
| Fault interlocks: full bin, lost air, blocked path | System response, line stop or alarm, recovery procedure | Controlled fault tests, system behavior log, operator actions |
| Acceptance responsibility and witness | Who conducts, supervises and signs off the verification | Qualified personnel assignment, acceptance report, retained records |
Document results and retain configuration evidence
Record every challenge pack classification, the reference weight, the checkweigher reading if available and whether the decision was correct. Note false rejects, missed classifications and any manual interventions or line stoppages. Retain the checkweigher settings, software version, calibration status and load-cell configuration active during the test so future changes or troubleshooting can reference a known baseline.
Include environmental notes such as adjacent machinery vibration, airflow or floor movement if these were identified as risks during installation. Attach photographs of challenge packs, reject collection and any non-conformances. The acceptance report should be signed by the responsible quality or engineering personnel and stored with the equipment commissioning records. A successful reject verification demonstrates that the installed system performs the agreed weighing and rejection decision under production conditions, not that it matches a catalog accuracy specification from a different test setup.
IndustryApex engineers work directly with customers to define acceptance protocols, prepare challenge packs and coordinate verification trials for checkweighers and integrated packaging inspection systems. Discuss your reject verification requirements and request an industrial checkweigher quotation with defined test scope and commissioning support.
Define your equipment requirements
Review the Industrial checkweigher buying guide for the complete equipment scope.
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Frequently asked questions
What challenge packs are needed for reject verification?
Prepare samples at minimum, target and maximum weights plus deliberate underweight and overweight packs. Use actual product or equivalent samples matching pack dimensions, bottom surface and internal motion. Measure each pack with a traceable reference method and record identifiers so classification decisions can be compared to known truth.
Should I test rejects at production speed or slowly?
Test at the agreed line speed and minimum spacing to confirm dynamic performance. Static or slow-speed trials do not establish whether the system can weigh, decide and reject correctly when packs arrive at production intervals. Include irregular spacing and consecutive rejects in the test protocol.
How do I verify that rejection actually works?
Observe physical removal of each rejected pack from the accepted stream and confirm it reaches the reject collection point. Check that the mechanism handles consecutive rejects without jamming and that the system signals or logs each rejection. A display decision without verified removal is incomplete.
What fault conditions should be tested?
Simulate loss of reject-actuator supply, blocked reject path or full reject bin through controlled tests supervised by qualified personnel. Verify the system detects faults, stops the line or diverts product to hold and recovers correctly. Document behavior and compare it to the agreed interlock specification.
What evidence should the acceptance report include?
Record every challenge pack classification, reference weight and decision correctness. Note false rejects, missed classifications and interventions. Retain checkweigher settings, software version, calibration status and environmental conditions. Qualified personnel should sign and store the report with commissioning records.
Can I use catalog accuracy specs instead of product trials?
No. Catalog specifications describe test conditions that may differ from your product, speed, spacing and site environment. Dynamic reject verification uses actual packs, production conditions and traceable reference measurement to confirm the installed system performs the agreed decision.
Reference information
- China High Speed Checkweigher factory and suppliers | Techik
Reference data and images explain equipment configurations. IndustryApex engineers confirm the offered model, specification and commercial scope in your project quotation.