| Manufacturer’s official website | Whether the supplier designs or manufactures checkweighers, and whether the listed model suits the product, package, line speed, and installation environment. | Current product datasheet, operating manual, factory address, legal business name, and a quotation identifying the exact model and configuration. | Match the legal business name and registered address on the quotation with the supplier’s business registration information. Ask for a live demonstration using a product similar to yours. | Specifications are model-specific, consistent across documents, and supported by a test using your product or an agreed equivalent. |
| Business-to-business sourcing platform | Supplier identity, product configuration, transaction terms, warranty coverage, spare-parts availability, and after-sales support. | Business registration details, signed quotation or pro forma invoice, technical specification, warranty terms, and a written list of included components. | Confirm the contracting entity and payment beneficiary match the verified supplier or are clearly explained in the contract. Do not treat a platform profile alone as proof of manufacturing capability. | The contract names the supplied model, scope, acceptance procedure, delivery terms, warranty, and responsible service contact. |
| Industrial equipment marketplace or trade directory | Whether the listing is current and whether the seller is the manufacturer, an authorized reseller, or a trading company. | Written confirmation of seller status, product origin, model number, recent equipment photos or video, and service arrangements. | Verify the seller’s legal entity independently and request a factory or equipment demonstration. Confirm who will handle commissioning, repairs, and spare parts. | Seller role and service responsibilities are disclosed in writing before payment. |
| Product weighing range and resolution | Maximum and minimum package weight, display increment, and the checkweigher’s stated weighing performance for the intended product. | Datasheet showing capacity, scale interval, operating conditions, and performance claims for the quoted configuration. | Compare the stated range with the actual package weights. Ask the supplier to explain how performance changes with product size, conveyor speed, spacing, and vibration. | Performance is demonstrated with representative packages on the proposed production line; do not rely on a resolution figure alone as proof of accuracy. |
| Throughput and line integration | Packages per minute under defined test conditions, conveyor dimensions, product spacing, reject method, and communication interfaces. | Test report or demonstration video identifying the product, package dimensions, line speed, test duration, and reject setup. | Run a trial with the intended package format and line conditions. Confirm electrical, mechanical, and data-interface requirements with the line integrator. | The agreed throughput is achieved without unacceptable missed weights, false rejects, or product handling problems. |
| Weighing performance and repeatability | Measured results across the operating range, including repeatability and the conditions under which any accuracy claim applies. | Documented test results using known test weights or representative products, with the test method and environmental conditions stated. | Ask for a witnessed acceptance test and agree in advance on sample size, test procedure, pass criteria, and responsibility for test weights. | Acceptance limits are written into the purchase agreement and verified during testing; avoid treating a brochure claim as a guaranteed result. |
| Metrology and standards documentation | Applicable legal metrology requirements for the intended use and destination, plus the standards or test methods used to support performance claims. | Applicable conformity or verification documents, calibration records where relevant, and the stated standard or procedure used for testing. | Check the document’s issuing body, scope, model coverage, validity, and whether it applies to the intended use. OIML R 51 is an international recommendation addressing automatic catchweighing instruments; applicability depends on the market and use case. | Documents cover the exact instrument configuration and intended application. Confirm local legal requirements with the relevant authority or qualified metrology specialist. |
| Supplier business credentials | Registered legal name, business status, registered address, and consistency between the supplier, contract, invoice, and payment details. | Business licence and the supplier’s Unified Social Credit Code. | Search the legal entity through China’s National Enterprise Credit Information Publicity System and compare the public registration details with the transaction documents. | The entity is identifiable and active, and any difference between the seller, contracting party, and payment beneficiary is documented and verifiable. |
| Quality-management certification | Whether a claimed management-system certificate is valid and covers the relevant legal entity and manufacturing or service scope. | Certificate number, issuing certification body, certified entity, scope, and validity dates. | Verify the certificate with the issuing body or an official certification information service. Certification of a management system does not, by itself, prove that a particular checkweigher meets its performance claims. | The certificate is current, authentic, and relevant to the entity and activities involved in the order. |
| Calibration and test capability | How weighing checks are performed, what test weights are used, and whether calibration or measurement results are traceable as required. | Calibration or test records identifying the instrument, test points, results, date, method, and issuing laboratory. | Review the laboratory’s accreditation and its scope if accreditation is claimed. CNAS accreditation applies only within the laboratory’s approved scope; it is not, on its own, product certification. | Records are relevant to the delivered instrument and support the specific measurement claims being made. |
| Warranty, service, and spare parts | Warranty duration and exclusions, response arrangements, installation and training, software support, and availability of wear parts. | Written warranty terms, service contact details, commissioning scope, spare-parts list, and recommended maintenance schedule. | Ask who provides local service, what response times are offered, and whether common replacement parts can be supplied during the expected equipment life. | Support commitments, exclusions, parts, and service responsibilities are stated in the contract rather than only in online messages. |
| Pre-shipment and delivery checks | Equipment identity, supplied accessories, packaging, documentation, and agreed factory acceptance results. | Serial-number record, packing list, factory acceptance test report, operation manual, and photos or video before dispatch. | Match the delivered machine and documents to the purchase order. Record visible transit damage and test results during installation and acceptance. | Payment milestones and final acceptance are tied to clearly documented delivery and test conditions. |
