Precision liquid handling is fundamental to bioprocessing. Whether diluting a concentrated solution, preparing a buffer, or coordinating multiple process streams, the objective seems straightforward: deliver the right amount of each component in the right proportion.
But how a system achieves—and maintains—that relationship matters.
Traditional blending and dilution systems commonly rely on ratio control, coordinating streams based on their instantaneous flow rates. Wautoma Biotech is taking a different approach.
Wautoma is integrating Digital Blending into its next generation of single-use technologies, beginning with its Single-Use Inline Dilution System and extending the architecture into future liquid-handling solutions.
Digital Blending shifts the control strategy from simply maintaining a relationship between flow rates to continuously accounting for the actual volume delivered by each participating stream.
That difference creates a new foundation for precision liquid handling.
What Is Digital Blending?
Digital Blending is a volumetric control strategy that synchronizes multiple process streams using actual delivered volume rather than relying solely on instantaneous flow measurements.
Instead of looking only at how fast each stream is flowing at a particular moment, Digital Blending continuously tracks how much each stream has actually delivered and coordinates those cumulative volumes to maintain the required blend relationship throughout the process.
In simple terms, traditional ratio control asks:
Are the streams flowing at the correct rates relative to one another right now?
Digital Blending adds another critical question:
Have the streams actually delivered the correct volumes relative to one another over time?
That distinction is central to the technology.
Why Look Beyond Traditional Ratio Control?
Conventional ratio control is widely used in process applications and can effectively regulate instantaneous flow. But instantaneous flow and cumulative delivered volume are not the same thing.
Real-world processes are dynamic. Pumps respond differently. Flow measurements fluctuate. Tubing characteristics can change. Pressure and temperature vary. Small deviations can occur during startup, transitions, and extended operation.
A traditional ratio-control system can continually adjust individual streams toward their instantaneous flow targets. But small differences between commanded, measured, and actual delivery can accumulate over time.
The result is integrated error: the cumulative difference between the amount of material that should have been delivered and the amount actually delivered.
Digital Blending addresses the process from a different perspective by making cumulative delivered volume part of the control strategy itself.
How Does Digital Blending Work?
At the core of Digital Blending is the concept of Verified Volume Delivery.
Each participating process stream is measured so that transferred volume can be accounted for over time. A supervisory Digital Blend Engine continuously calculates and monitors the cumulative volumetric relationship among those streams.
A common Master Demand establishes the required total blend delivery, while each participating stream receives an individual demand based on its required recipe contribution.
The system then continuously compares:
- how much volume each stream should have delivered;
- how much it has actually delivered; and
- whether the required volumetric relationship is being maintained.
When differences arise, the control architecture can respond to reconcile them and maintain synchronization among the participating streams.
This continuous process of measurement, comparison, and correction is what Wautoma refers to as volumetric synchronization and volumetric reconciliation.
How Is Digital Blending Different from Ratio Control?
The fundamental difference is the basis of control.
Ratio control establishes the setpoint of one process stream as a defined proportion of another stream’s measured flow rate.
Digital Blending coordinates process streams based on their cumulative delivered volumes.
This does not mean instantaneous flow control disappears. Individual flow controllers still play an important role in regulating each process stream.
Digital Blending adds a supervisory layer above those local flow controllers—one that continuously evaluates the material relationship among the streams based on what has actually been delivered.
The objective is therefore not simply flow-rate alignment, but volumetric accountability throughout the blending process.
Why Does Volumetric Accountability Matter?
Ultimately, a blending or dilution process depends on material balance.
If two streams are intended to contribute specific volumes to a formulation, achieving the correct instantaneous flow relationship is only part of the objective. The process must also deliver the correct cumulative quantity of each material.
Digital Blending continuously accounts for those quantities.
This approach can help support:
- Greater dilution and blending accuracy
- Reduced cumulative ratio drift
- Improved process stability
- Greater blend consistency
- More consistent performance from startup through extended production runs
- Improved repeatability and reproducibility
- More robust control of multi-stream processes
It also provides a common control architecture applicable across different liquid-handling applications.
Digital Blending and Single-Use Inline Dilution
Wautoma is initially integrating Digital Blending into its next-generation Single-Use Inline Dilution System.
Inline dilution combines a concentrated solution with a diluent during transfer to achieve the required concentration, rather than preparing the entire final volume in a separate mixing vessel.
The approach can reduce the need to prepare, store, and handle large volumes of pre-diluted solution. But its effectiveness depends on accurately coordinating the concentrate and diluent streams.
Digital Blending is designed around that requirement.
Rather than relying solely on an instantaneous flow ratio, the system continuously accounts for the volume delivered by each stream and coordinates those volumes throughout the dilution process.
Beyond Inline Dilution: A Platform for Precision Liquid Handling
The principles behind Digital Blending are not limited to a two-stream dilution process.
The same volumetric architecture can be extended to applications involving multiple coordinated liquid streams, including buffer preparation and continuous buffer conditioning.
As biomanufacturers move toward more flexible facilities, intensified processing, single-use technologies, and greater automation, the ability to accurately coordinate multiple process streams becomes increasingly valuable.
Digital Blending provides Wautoma with a common control architecture to develop next-generation single-use liquid-handling solutions.
A Different Foundation for Blending Control
The premise behind Digital Blending is straightforward:
Flow tells you how fast a stream is moving. Volume tells you how much material has actually been delivered.
Both matter.
By combining local flow control with continuous volumetric accountability, Digital Blending provides a different foundation for coordinating process streams—one designed to maintain the intended material relationship throughout the entire blending operation.
For Wautoma Biotech, that architecture is becoming an important building block for the next generation of single-use systems, including our new inline dilution system.
Exploring Digital Blending: A Wautoma Biotech Series
Digital Blending represents a different way of thinking about precision liquid handling—and understanding that difference requires looking beyond a single specification or feature.
That’s why we’re featuring a series of blog articles exploring the technology, the control principles behind it, and its application to modern bioprocessing.
We’ll examine questions including:
- Why can traditional ratio control allow errors to accumulate over time?
- What is the science behind Digital Blending?
- How does volumetric synchronization work?
- What is Verified Volume Delivery?
- How can Digital Blending improve single-use inline dilution?
- How can the same architecture be applied to buffer preparation?
- What do terms such as volumetric accountability, integrated error, blend fidelity, pacing, and analytical trim mean?
Explore The Complete Digital Blending Blog Series
Read all the blogs in our series about Digital Blending for a deeper understanding of the technology—from its underlying principles and advantages over conventional ratio control to the science behind verified volumetric control and its application in single-use inline dilution and buffer preparation. Access the blogs here:
What Is Digital Blending? A New Approach to Precision Liquid Handling in Bioprocessing
https://wautomabio.com/what-is-digital-blending-a-new-approach-to-precision-liquid-handling-in-bioprocessing/
Digital Blending Glossary: Key Terms for Precision Liquid Handling and Bioprocess Control
https://wautomabio.com/digital-blending-glossary-key-terms-for-precision-liquid-handling-and-bioprocess-control/
Why Ratio Control Is No Longer Enough for Modern Bioprocessing
https://wautomabio.com/why-ratio-control-is-no-longer-enough-for-modern-bioprocessing/
The Science Behind Digital Blending: Why Verified Volumetric Control Changes Everything
https://wautomabio.com/the-science-behind-digital-blending-why-verified-volumetric-control-changes-everything/
Eliminate Ratio Drift in Buffer Preparation: The Power of Digital Volumetric Blending in Single-Use Systems
https://wautomabio.com/eliminate-ratio-drift-in-buffer-preparation-the-power-of-digital-volumetric-blending-in-single-use-systems/
How Digital Blending Transforms Single-Use Inline Dilution and Buffer Preparation
https://wautomabio.com/how-digital-blending-transforms-single-use-inline-dilution-and-buffer-preparation/