Direct answer
Volumetric filling controls a measured volume, while weigh filling controls mass. Choose from the declared quantity, product density variation, dose size, pack handling, required accuracy, speed and cost of giveaway. Both methods can be accurate when the application and control are suitable.
Key takeaways
- Define whether mass or volume is the commercial result.
- Compare repeatability across normal conditions.
- Match the control method to product and pack.
- Validate calibration, cleaning and changeover.
Set a measurable objective
A volumetric dose can change in mass when density changes; a mass dose can change in visible level when container volume or density changes. State the legal, customer and visual acceptance requirements separately.
- Identify declared quantity and tolerance
- Measure density across temperature and batch
- Define visible fill-level requirements
- Record container tare and volume variation
Measure the current production condition
Use representative product from the start and end of a batch or supply cycle. Record individual results, average, range, speed, settling and interventions.
- Test minimum and maximum dose
- Include normal product temperature range
- Measure tare variation for net weighing
- Calculate average giveaway and underfill risk
Plan the work in a controlled sequence
Volumetric systems can be fast and straightforward for stable products. Weigh systems directly measure mass and can suit larger or variable-density fills, but need stable weigh conditions and controlled product cut-off.
- Check pump, piston, gravity or flow-meter options
- Check gross or net weigh architecture
- Assess vibration, drafts and container support
- Plan coarse/fine flow and dribble control
Hold the improvement after handover
Document reference checks, calibration method, recipes, nozzle or valve condition and the response to product changes. Review whether control limits still match the commercial requirement.
- Use traceable check weights or volume methods
- Control recipe and product density data
- Inspect shut-off and product build-up
- Trend fill results and giveaway
Comparison table
| Stage | Customer decision | Evidence |
|---|---|---|
| Objective | Define whether mass or volume is the commercial result. | A numerical target and owner |
| Baseline | Compare repeatability across normal conditions. | Representative production records |
| Action | Match the control method to product and pack. | A timed plan with responsibilities |
| Control | Validate calibration, cleaning and changeover. | Approved standard work and review data |
Free working templates
Download these files and adapt them to the actual machine, product, site and acceptance plan.
Related buyer guides and tools
Relevant machinery and support routes
Use the guide to define the requirement, then compare the specialist routes below against representative product, packaging and output evidence.