Magnetic Pump vs. Fully Closed Pump in a Circulating Chiller for Rotary Evaporation — Which One Should You Use?

When you use a circulating chiller, you can choose between two common pump types: a magnetic drive pump or a fully closed pump (also called a canned motor pump).

Both are designed to prevent leaks, but they have some key differences.

Magnetic Drive Pump

How it works:
This pump uses magnets to spin the impeller inside, so it doesn’t need a shaft seal.

Advantages:
No leaks: No shaft seal means no leaks from seal wear.
Low maintenance: Fewer parts to replace.
Safe for hazardous liquids: Good for toxic or corrosive chemicals.
Handles many temperatures and pressures: Works in different conditions.

Disadvantages:
Slightly less efficient: The magnetic system can lose a bit of energy.
Can’t run dry: It needs liquid to cool and lubricate itself — if it runs dry, it can get damaged.

Fully Closed Pump (Canned Motor Pump)

How it works:
Here, the motor and pump are completely sealed inside one unit. The liquid flows around the moving parts inside the sealed housing.

Advantages:
Highest leak protection: Great for fluids that must not leak at all.
Keeps fluid pure: No chance of contamination.
Can handle different fluids and conditions: Very versatile.

Disadvantages:

More expensive: It costs more to buy.
Harder to repair: Needs special tools and skills for maintenance.
Can be less efficient than other pump types:

Which One Should You Use in a Chiller?

Magnetic Drive Pump:
A good option for everyday cooling jobs where leaks must be avoided but easy maintenance is also important.

Fully Closed Pump:
Best for critical jobs where zero leaks and perfect fluid purity are needed — for example, in pharma or semiconductor manufacturing.

Conclusion:
Both pump types keep leaks to a minimum, but the fully closed pump gives maximum leak protection and is better for very sensitive or high-risk applications.

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You may like to read these links: 

1. List of All SOPs and Documents for Laboratory Instruments and Equipment

2. List of All SOPs and Documents for Chemistry Laboratory

3. List of All SOPs and Documents for Calibration of the Instruments and Equipment

4. SOP for Rotary Evaporator (Rotavapor).

5. Utilization of Rotary Evaporator Systems in Natural Product Research: Applications and Essential Specifications

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