Gravimetric dosing vs volumetric dosing
| Gravimetric Dosing | Volumetric Dosing |
|---|---|
| Measures actual mass delivered | Assumes fixed volume |
| Compensates for density changes | Sensitive to density variation |
| Higher accuracy for solids | Faster but less precise |
| Strong traceability | Limited auditability |
For many laboratories, volumetric dosing remains useful for non-critical steps, while gravimetric dosing is applied where accuracy and reproducibility are essential.
Is gravimetric dosing right for your lab?
Gravimetric dosing is particularly valuable if your lab:
• Works with powders or variable-density materials
• Requires high accuracy and repeatability
• Operates in regulated or quality-critical environments
• Needs reliable data capture and traceability
How gravimetric dosing works
In a typical gravimetric dosing system:
• A container or target vessel is placed on, or monitored by, a balance
• Material is dispensed into the target
• The system continuously monitors weight change in real time
• Dispensing stops automatically once the target mass is achieved
This closed-loop feedback ensures each dose meets specification, even when working with challenging materials such as fine powders or variable-flow solids.
Why laboratories use gravimetric dosing
Gravimetric dosing is widely adopted across industries because it offers several practical advantages:
Improved accuracy and reproducibility
Because dosing is based on weight, gravimetric systems deliver consistent results regardless of changes in material behaviour.
Reduced rework and waste
Accurate dosing reduces out-of-spec samples, helping laboratories minimise rework and material waste.
Better data integrity
Weight-based measurements provide clear, auditable records, supporting traceability and compliance in regulated environments.
Flexibility across materials
Gravimetric dosing works with a wide range of solids and liquids, including powders with poor flow characteristics.
Gravimetric dosing in automated laboratories
In automated environments, gravimetric dosing is often integrated into larger workflows that include sample handling, mixing, and analysis.
Automation allows gravimetric dosing to:
• Run unattended for extended periods
• Maintain consistent cycle times
• Reduce operator-to-operator variability
• Integrate directly with data capture and control software
This makes gravimetric dosing particularly well suited to high-throughput and multi-sample applications.
What is MultiDose gravimetric dosing system?
Traditional gravimetric dosing setups often focus on one material, one container at a time. While effective, this approach can limit throughput.
A multi-dose gravimetric dosing system extends the same weight-based accuracy to workflows that require:
• Multiple materials
• Multiple containers or vials
• Longer unattended runs
MultiDose is designed to manage several dosing heads or materials within a single run, reducing manual intervention while maintaining precision.
Gravimetric dosing with MultiDose
MultiDose is Labman’s gravimetric dosing platform designed to support higher-throughput laboratory workflows. It applies the principles of gravimetric dosing at scale, combining accurate weight-based dispensing with automation features that reduce operator involvement.
Key characteristics of MultiDose include:
• Automated handling of multiple dosing heads
• RFID-based validation to confirm correct materials are loaded
• The ability to process multiple rack formats in a single run
• Intelligent handling of out-of-tolerance dispenses to maintain uptime
Rather than focusing on a single dispense, MultiDose is designed to support continuous, repeatable gravimetric dosing across many samples, making it suitable for formulation, screening, and QC environments.
Final thoughts
Gravimetric dosing remains one of the most reliable ways to achieve accurate, repeatable dispensing in the laboratory. By measuring what is actually delivered, rather than what is assumed, it reduces variability and improves confidence in results.
With platforms such as MultiDose, gravimetric dosing can now be applied at scale, supporting higher throughput and more automated workflows without sacrificing precision.