A checkweigher's performance comes down to matching accuracy, speed, and reject mechanism to your product and line — treating "±5g accuracy" as a universal spec regardless of product weight and line speed is a common way projects end up with a checkweigher that underperforms in practice.
Key Performance Metrics
- Accuracy: ±0.5g to ±5g, model and speed dependent
- Maximum speed: up to 200 packages per minute
- Weight range: 50g – 50kg, varies by model
- Certification: OIML R51 compliant
Accuracy and speed trade off against each other — the tightest accuracy figures (±0.5g) apply at lower line speeds, and accuracy widens somewhat as speed increases toward the 200 packages/minute ceiling. Specifying both without understanding this relationship is how a checkweigher ends up under-performing against expectations that were never realistic for the actual operating speed.
What OIML R51 Compliance Means
OIML R51 is the international standard governing automatic checkweighing instrument accuracy and testing. Compliance matters specifically because it's the accuracy standard weights and measures enforcement references — a checkweigher without this certification doesn't give you a defensible basis for weight compliance claims if your fill accuracy is ever questioned by a regulator or customer.
Construction and Environment
Housing is stainless steel SS304 in a washdown-rated design — relevant for food, pharmaceutical, and any environment requiring regular cleandown. This isn't a cosmetic spec choice; washdown rating affects how the checkweigher holds up to routine cleaning without degrading electronics or seals over time.
Reject Mechanisms
Three options are available, each suited to different product characteristics:
- Pusher arm — mechanical push, suited to moderate-weight, stable products
- Air-blast — non-contact rejection using compressed air, suited to lightweight or delicate products where physical contact risks damage
- Drop-gate — gravity-based rejection, suited to heavier products or where a simple, robust mechanism is preferred
Choosing the wrong reject mechanism for your product's weight and fragility is a common spec gap — an air-blast system sized for light packages won't reliably reject a heavier product, and a pusher arm on a fragile product risks damaging good product during rejection.
Interface and Data Integration
HMI touchscreen with statistical process control gives visibility into fill trends over time, not just pass/fail per unit — this is what turns a checkweigher from a simple reject gate into a diagnostic tool for catching upstream filler drift before it becomes a real problem. Ethernet/IP and Modbus TCP connectivity allow integration with ERP systems for production data tracking.
What to Send With Your Enquiry
A complete checkweigher spec starts with: product weight range and target fill weight, required line speed, product fragility (affecting reject mechanism choice), packaging type (bag, carton, or other), and whether OIML R51 certification is a regulatory requirement for your market. Review the full Checkweigher specification range before finalising your line's weight verification setup.
Ready to talk about your checkweigher?
ENZAC supplies checkweighers in Malaysia sized to your product weight range and required line speed, with the reject mechanism matched to your product. Send us your product and line details and we'll come back with a tailored specification.