Knowledge centre · Buying process
A signed acceptance test is your only guarantee that the machine delivers what the datasheet promised. Make it precise.
Do not wait until the machine is built to discuss testing. The acceptance protocol — product, fill volume, line speed, accuracy target and how samples are measured — belongs in the purchase contract. Without it, "acceptable" means whatever the supplier says it means on the day.
| Step | Practical guidance |
|---|---|
| Use your product | Water or substitute liquids test the machine, not your product. Accuracy claims (e.g. ±0.5%, error ≤1 g on pure liquids; ±1 g–±2 g measured on particle-containing or high-viscosity products) must be demonstrated on the actual product. |
| Take enough samples | A handful of containers proves nothing. A practical minimum is 30–50 consecutive fills at production speed, weighed individually. |
| Weigh properly | Weigh the fill net (filled minus tare) on a calibrated scale; record every value, not just an average. |
| Check start and steady state | Include the first fills after a stop and fills at continuous speed — both matter in production. |
| Agree the metric | Decide whether acceptance is mean error, max deviation, or a percentage of samples within tolerance — and write it down. |
Factory acceptance is a strong signal, but installation at your plant introduces new variables — feed pressure, piping length, temperature, air supply. Repeat the core accuracy test at site acceptance with your product, at production speed, and keep the records. If results drift, investigate the installation variables first, not the machine.
Grounton Pak defines the acceptance protocol in the purchase contract and runs it with your product at factory acceptance — the accuracy target, sampling method and acceptance report are agreed before the order, not improvised on delivery day.
Grounton Pak (Hebei Guangteng Machinery Equipment Co., Ltd., brand GROUNTON) has built metering-grade rotor pump filling machines since 2013 — more than 40,000 units delivered, with ±0.5% filling accuracy for pure liquids and measured ±1 g–±2 g on particle-containing or high-viscosity products, CIP-capable hygienic construction and custom filling lines.
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