Presence
Confirm at least one product, insert, closure or component is present in the required location.
Fill-level inspection ›
Presence and completeness checks
Missing Product Detection Systems UK
Confirm that every required product, dose, cavity or component is present before the pack closes or leaves the controlled inspection point.
Direct answer
How does missing-product detection work?
A camera or suitable sensor checks the pack at the point where the required product is most clearly presented. The system verifies each expected position, count or presence feature, links the result to the pack and rejects or stops the line when completeness rules are not met.
The best inspection point is often before a lid, cap, foil or carton hides the contents. Where the product is already enclosed in an opaque pack, X-ray or another penetrating sensor may be required. Counting and presence are different tasks, so the method is designed around the actual failure mode.
What the system must do
Inspect completeness at the clearest point.
Earlier inspection usually gives a cleaner view, while downstream tracking ensures the decision follows the correct pack.
Count
Verify an exact quantity or the number of occupied cavities when products can be separated clearly.
Completeness
Check multiple expected positions in trays, kits, multipacks or assembled packaging.
Specify the application
Define every required position and failure response.
Samples should include genuine missing, misplaced, overlapping and wrong-product conditions—not only ideal good packs.
- Required product count, cavity map or component positions for every recipe
- Product size, colour, shape, overlap, orientation and allowable variation
- The last inspection point before the contents become hidden
- Pack indexing, conveyor motion, trigger timing and result-to-pack tracking
- Wrong-colour, wrong-shape or mixed-product criteria where these are measurable
- Reject confirmation, line-stop logic, event images and audit records
Typical applications
Presence checks from dose to multipack.
Suitability and tolerances are established from representative samples, production speed and the real operating environment.
Practical answers
Questions production teams ask.
Final performance is application-specific and is confirmed using representative packs, products and line conditions.
Ask an engineerIs presence detection the same as counting?
No. Presence detection confirms that a product exists in a defined area. Counting verifies a quantity. A system may perform both, but counting needs sufficient product separation and image quality.
Can the system detect the wrong tablet or capsule?
It may be possible to add colour, size and shape rules when those features reliably distinguish the product. Full surface inspection or subtle defect classification is a different application and may require specialist presentation and additional views.
Can closed opaque packs be inspected?
Yes in suitable cases using X-ray or another sensing technology. Feasibility depends on product density, pack material, geometry, overlap and the size of the missing item.
What evidence is available after a failure?
The system can record counters, timestamps, defect categories and images where the selected technology provides them. The exact data-retention and traceability requirements are agreed in the project specification.
Talk to Oxford Vision Systems