Pump Sample Approval: Comparing First Use And Later Strokes

Before the pump is primed, early strokes may move air or only part of the intended amount of formula. Later full strokes can behave differently once the flow path is filled. Record the first usable delivery separately from later output. An average across all strokes can hide both a slow start and a stable delivery after priming.

Define each stage before testing

Use the intended formula, container, pump and fill condition. Keep the sample upright if that is the intended test position. Use the same actuation travel, speed and time between strokes, allowing the pump to return between strokes. Record each stroke until the agreed priming criterion is met. Then compare a defined series of later strokes using the intended mass or volume measurement.

Separate a restart from first use

If performance after storage matters, add a separate restart check with a defined rest period. A fresh unit and a previously primed unit may start in different conditions. Report priming count, output variation and any partial strokes or poor return separately. Set acceptance criteria for the actual pump and formula combination rather than importing a universal stroke count.

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