Liquid Handling & Pumps
The Ultimate Masterflex Guide: How to Select the Right Peristaltic Pump System
A Masterflex fluid handling system is often the best choice when fluid purity, clean transfer, and controllable flow matter. Because the liquid only contacts the inside of the tubing, Masterflex peristaltic pumps are widely used for pharmaceutical dosing, laboratory fluid transfer, food and beverage processing, environmental sampling, and chemical handling where cross-contamination must be reduced.
The challenge is that a Masterflex system is not a single product. It is a configurable setup built from a drive, a pump head, and tubing. Choosing the right combination has a direct impact on flow stability, tubing life, chemical compatibility, maintenance demands, and overall cost of ownership.
Quick Selection Tip: If your application needs accurate low to medium flow in a laboratory setting, start with an L/S system. If you need higher flow, tougher tubing, or more demanding process duty, move toward an I/P or high-flow configuration. The tubing choice is just as important as the drive.
How a Masterflex Peristaltic Pump Works
Peristaltic pumps operate by compressing flexible tubing with rotating rollers. As the rollers move, fluid is displaced forward in a controlled, repeatable manner. This positive displacement principle gives users several practical advantages: the pump body never touches the fluid, tubing changes are straightforward, and sensitive liquids can often be transferred with less shear than with many other pump types.
This makes Masterflex systems particularly useful for sterile transfer, aggressive reagents, viscous products, sample dosing, and applications where cleaning time and contamination risk need to be kept low.
Building the System: Drive, Pump Head, and Tubing
Every Masterflex setup is built around three core components. Understanding the role of each one makes selection much easier and helps avoid mismatched systems.
⚙️ Pump Drive
The drive controls speed, torque, and overall flow behaviour. A unit such as the L/S Standard Digital Drive is suited to laboratories that need adjustable speed and dependable control.
🌀 Pump Head
The pump head holds and compresses the tubing. Options such as the L/S Easy-Load II Pump Head are popular because they simplify tubing changes and support repeatable installation.
🧪 Tubing
Tubing is the only wetted part of the system, so it has a major effect on purity, compatibility, pressure tolerance, and service life. A common starting point is Masterflex L/S 16 Platinum-Cured Silicone Tubing for clean laboratory transfer.
Masterflex L/S vs I/P vs High-Flow: Which Range Fits Best?
In practice, most buyers begin by deciding between the L/S series, the I/P series, or a higher-flow process setup. The right choice depends on required flow, tubing size, fluid properties, and duty cycle.
| Range | Best For | Example Product | Practical Use |
|---|---|---|---|
| L/S® | Low to medium flow, high control | L/S Digital Miniflex Pump | Laboratory dosing, sample transfer, benchtop work |
| I/P® | Higher flow and tougher applications | I/P 82 Platinum-Cured Silicone Tubing | Viscous liquids, larger transfer volumes, process work |
| High Flow | Bulk transfer and more demanding throughput | High-Pressure High-Flow Pump | Larger-scale fluid handling and transfer |
Expert Highlight: For users who are unsure where to start, it is often easier to choose the tubing size and material first, then match the pump head and drive to that tubing. This usually leads to a more practical system than choosing the drive first and trying to force the rest of the configuration around it.
How to Choose the Right Tubing
Tubing selection is where many Masterflex systems are won or lost. It affects flow, chemical compatibility, sterilisation suitability, flex life, and how often the system needs maintenance. Even when the drive is correct, poor tubing selection will still cause unstable performance.
1. Tubing Size
The inside diameter largely determines flow rate. Smaller sizes are better for fine dosing and controlled transfer, while larger sizes support higher throughput. Popular examples on the site include L/S 15, L/S 16, L/S 18, and L/S 24.
2. Material Compatibility
Platinum-cured silicone is commonly selected for clean laboratory transfer and bioprocess work. For users needing biopharmaceutical-grade options, products such as L/S 24 Biopharm Platinum-Cured Silicone Tubing and L/S 36 Biopharm Platinum-Cured Silicone Tubing may be more appropriate.
3. Chemical Resistance and Process Conditions
Not every fluid should be run through silicone. For more demanding chemical environments, users may need materials such as Viton or other specialised tubing depending on fluid composition, temperature, and pressure. An example from the current range is L/S 16 FDA-Compliant Viton Tubing.
Real-World Selection Scenarios
Selection becomes easier when you frame the decision around what the pump actually needs to do. Below are common scenarios that help narrow the range.
Sterile or Clean Transfer
Prioritise high-purity tubing and a pump head that allows clean, repeatable loading. Biopharm-grade silicone options are often preferred.
Viscous Fluids
Use a stronger drive, larger tubing size, and a head designed for the required compression. This is where I/P or higher-flow systems often become more suitable.
Continuous Operation
Focus on tubing life, maintenance access, and stable drive performance. Systems running for long periods benefit from well-matched tubing and careful installation.
Multi-Channel Work
When several fluid lines must run from one drive, multi-channel head configurations can increase throughput while keeping the footprint manageable.
Installation and Maintenance: What Extends Tubing Life?
Many tubing problems are caused by setup errors rather than product faults. Correct installation has a direct effect on sealing, repeatability, and service life.
- Use square cuts: uneven tubing ends can compromise sealing and encourage leaks.
- Avoid twisting during installation: twisted tubing wears faster and can alter performance.
- Check for abrasion: rubbing against the housing or other surfaces shortens tubing life.
- Do not overtighten fittings: excess force can distort tubing or damage connections.
- Monitor flow changes: a gradual drop in performance often indicates tubing fatigue or a developing restriction.
For a broader look at how operating conditions affect performance, see our blog on understanding pump speed and pressure. For readers working in clinical or medical transfer applications, our article on how to select a pump for dialysis machines is also worth reading.
⚠️ Safety Alert: Never use your bare hands to search for a pressurised leak. Fine pinhole leaks can penetrate skin. Use cardboard or another suitable object to identify the leak safely, then isolate the system before servicing.
Frequently Asked Questions
What is the difference between Masterflex L/S and I/P systems?
L/S systems are usually chosen for controlled laboratory flow and smaller tubing sizes. I/P systems are more suited to higher flow, more rugged duty, and larger tubing.
How do I choose the right tubing size?
Start with the required flow rate, then match the tubing size to the head and drive. Larger tubing supports higher flow, while smaller sizes are better for more precise dosing.
Can Masterflex pumps handle sterile or biopharmaceutical fluids?
Yes, this is one of the main reasons peristaltic systems are selected. Because only the tubing contacts the fluid, appropriate high-purity tubing can be used for clean transfer applications.
How often should peristaltic tubing be replaced?
Replacement frequency depends on fluid type, operating speed, pressure, tubing material, and how well the tubing was installed. Regular inspection is important, especially in continuous-duty applications.
Conclusion
The best Masterflex setup is the one that matches your actual process, not just the highest-speed drive or the most familiar tubing. When the drive, pump head, and tubing are properly matched, Masterflex systems deliver clean transfer, dependable flow, easier maintenance, and better long-term value.
If you are comparing options for your lab or process line, the Masterflex range at John Morris Group includes drives, pump heads, tubing, and accessories to support a wide range of fluid handling applications.
John Morris Group
Australia & New Zealand's trusted partner for scientific instruments, laboratory equipment, and technical solutions since 1952.
