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Electro Freeze Pump Comparison: RMT vs. CMT Mix Transfer Systems
Posted on Nov 01, 2023
What’s The Difference Between The Two?
When selecting an Electro Freeze ice cream machine, understanding the differences between the RMT and CMT mix transfer systems is crucial. These pump styles play a crucial role in maintaining consistent product texture, controlling overrun, and ensuring efficient operation.
This guide breaks down the RMT (Rotor Mix Transfer) and CMT (Compression Mix Transfer) systems, comparing their features, maintenance needs, and performance. By the end, you’ll have a clear understanding of which system suits your business needs best.
RMT vs. CMT: Key Differences at a Glance
| Feature | CMT Mix Transfer System | RMT Mix Transfer System |
|---|---|---|
| Pump Type | Peristaltic (soft tubing) | Stainless-steel rotor |
| Durability | Requires tubing replacement | Long-lasting metal components |
| Overrun Control | Adjustable, but softer control | Precise and stable |
| Mix Compatibility | Best for low-fat, non-dairy | Works well with all mix types |
| Maintenance | Easier to clean, fewer parts | More parts require lubrication |
| Best For | Low to moderate volume shops | High-volume operations |
Choosing between CMT and RMT comes down to your business needs. If you prioritize ease of maintenance and gentle mix handling, CMT is a great choice. If you need high efficiency, durability, and precision, RMT is the way to go.
CMT Mix Transfer System Explained: How It Works & Key Features
The CMT (Compression Mix Transfer) system is a peristaltic-style pump that operates using flexible tubing and rollers to move the mix from the hopper to the freezing cylinder.
Key Features of the CMT System:
✔ Gentle Mix Transfer: Uses a soft-roller mechanism that squeezes the tubing to push the mix through.
✔ Simplified Maintenance: Fewer moving parts, making it easier to clean and replace.
✔ Adjustable Overrun Control: Allows fine-tuning of air-to-mix ratio for consistent product texture.
✔ Ideal for Low-Fat and Non-Dairy Mixes: Less turbulence preserves the integrity of delicate mixes.
Slices Concession’s take on the CMT Transfer System
The CMT is a classic and older peristaltic pump style designed by Electro Freeze. This ice cream machine pump features lightweight plastic parts, including the MTS covering/housing. the plastic materials may require more frequent maintenance and part replacements over time.
Key Components of a CMT Pump (Mix Transfer System)
| Component | Description |
|---|---|
| 1. Mix Transfer System (MTS) | The core mechanism responsible for moving the mix and aerating it before freezing. |
| 2. MTS Handle | Controls the movement of the MTS slide, allowing engagement or disengagement of the transfer hose. |
| 3. MTS Swing Clamp | Secures the MTS slide in position to ensure proper contact with the rollers—critical for system operation. |
| 4. MTS Slide | Aligns the transfer hose under the rollers, enabling smooth product flow. |
| 5. Pickup Tube | Transfers the ice cream mix from the storage container to the MTS. Includes a duckbill check valve to prevent backflow, ensuring consistent mix delivery. |
RMT Mix Transfer System Overview: How It Works & Benefits
The RMT (Rotor Mix Transfer) system is a stainless-steel gear-driven pump designed for high-efficiency mix delivery and precise overrun control.
Key Features of the RMT System:
✔ Durable Stainless Steel Construction: Built for longevity and reliability.
✔ Higher Pressure Transfer: Ensures a steady, controlled mix flow.
✔ More Precise Overrun Adjustment: Ideal for businesses that require a specific mix-to-air ratio.
✔ Preferred for High-Volume Operations: Handles large batches with consistency.
Slices Concession’s Take on the RMT Mix Transfer System
The RMT is the newer pump style that is incorporated into pressurized Electro Freeze machines. The design of the RMT was inspired by the more robust pumps that Electro Freeze would use when making frozen dessert machines for Dairy Queen. The RMT is most notable for using stainless metals instead of plastic. This causes the RMT to be more durable. This pump uses more pressure (pounds per square inch) in its system which can be controlled through the air tubes.
What Parts Does An RMT Have?
Core Components of the Roller Assembly
| Component | Description |
|---|---|
| 1. Support Roller Bearing | The bearing holds the roller assembly in place. |
| 2. Shoe Roller | Creates an opening for the mix transfer hose, applying pressure to move the product. |
| 3. Complete Roller Assembly | Pumps product mix and air through the system into the freezing cylinder. |
| 4. Knob Hand | Locks the roller shoe into position. |
| 5. Clamp Shoe | Places the hand knob into position over the roller shoe. |
| 6. Retainer Air Tube | Keeps the air meter tube in the “up position.” |
| 7. Air Meter | Regulates the air being pumped through the system. |
| 8. Tube Air | Provides a connection to the air meter. |
| 9. Clamp Assembly Soft Hose 5/8″ | Prevents leaking from mating parts. |
| 10. Hose Assembly Mix Braided | Connects the mix transfer systems (MTS) to the cylinder inlet. |
| 11. Cover MTS | The cover protects the MTS from other moving parts and needs to be in place for the MTS to operate. |
| 12. Hose Transfer Red | A “red lined” hose is squeezed by rollers to move the product mix to the freezing cylinders. |
| 13. Tube Assembly Mix Inlet | Moves mix from the container to MTS. |
| 14. Duckbill | A rubber valve that prevents backflow into the mix container. |
| 15. Port Air/Mix | Infuses air into the product mix as it flows into the transfer hose. |
| 16. Clip Tube Retainer | Locks the mix pickup tube into the air or mix port. |
| 17. O Ring | Keeps the mix tube sealed in the air or mix port. |
CMT vs. RMT: Which Electro Freeze Mix Transfer (Pump) System is Right for You?
Both the CMT and RMT mix transfer systems deliver top-tier soft serve quality, but the right choice depends on your business’s needs. The CMT, with its lightweight plastic components, is easier to handle and well-suited for lower-demand operations, though it requires more frequent maintenance due to natural wear. The RMT, with its durable stainless-steel design and higher pressure capabilities, is built for high-volume environments, offering longevity and consistent performance, though it comes with more components. No matter which system you choose, regular maintenance is key to keeping your Electro Freeze machine running smoothly and serving up perfect soft serve every time.
For a comprehensive guide on choosing between pump and gravity machines, read our article on Pump vs. Gravity Machines: Which One To Choose?
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