An ultra-low freezer (ULT freezer) is essential for laboratories storing biological samples, pharmaceuticals, and other temperature-sensitive materials. Operating at temperatures as low as -86°C, these freezers ensure sample integrity and prevent degradation. However, choosing the right ULT freezer requires careful consideration of cooling technology, storage capacity, energy efficiency, and security features.
At Apex Scientific, we supply ultra-low freezers from leading brands Antech Scientific and Arctiko. This guide will help you navigate key technical specifications and select the best ULT freezer for your laboratory in South Africa.
Understanding Ultra-Low Freezer Cooling Technologies
Cascade Compressor Systems (Antech Scientific)
These freezers use two compressors working together for efficient ultra-low cooling, offering:
- High cooling efficiency
- Fast pull-down times
- Reliable long-term performance
Best for: Laboratories needing rapid temperature recovery and consistent performance under heavy usage.
Economic Dual Compressor Systems (Antech Scientific)
This system alternates between two compressors to reduce strain, ensuring:
- Cost-effective operation
- Reduced wear and tear
- Extended compressor lifespan
Best for: Labs seeking a balance between performance and affordability.
Inverter-Based Dual Compressor Systems (Arctiko)
Arctiko’s ULT freezers feature inverter-driven compressors, adjusting speed based on cooling demand. This leads to:
- Improved energy efficiency
- Lower noise levels
- Longer lifespan due to reduced strain
Best for: Laboratories looking for energy-efficient, quiet, and sustainable freezing solutions.
Key Technical Considerations
Temperature Stability & Uniformity
A reliable ultra-low freezer should maintain stable temperatures to prevent sample degradation. Look for:
- Minimal temperature fluctuations (±3°C or less)
- Uniform cooling throughout the chamber
Storage Capacity & Internal Layout
Choose a freezer that suits your storage needs:
- Compact models for small labs or backup storage
- Large upright freezers for high-throughput labs
- Custom racking solutions for optimized organization
Energy Efficiency & Power Consumption
With rising energy costs, selecting an efficient ULT freezer can significantly reduce operational expenses. Consider:
- Inverter-driven compressors (e.g., Arctiko)
- Energy Star-certified models
- Multi-voltage compatibility for global use
Backup Power & Alarm Systems
To prevent sample loss in case of power failure, choose a ULT freezer with:
- Battery-backed alarm systems
- Remote monitoring capabilities
- CO₂ or LN₂ backup systems
Upright vs. Chest Ultra-Low Freezers
| Feature | Upright Freezers | Chest Freezers |
| Storage Capacity | Large volume, multiple shelves | Takes up alot of floor space |
| Temperature Stability | Slightly more prone to fluctuations when opened. However this has been improved with better insulation and inner doors. | More stable due to minimal cold air displacement when door is open |
| Accessibility | Easy access to stored samples | Requires bending to reach items |
| Best For | High-throughput labs needing frequent access | Long-term storage with minimal access |
Customizable Racking & Storage Solutions
Proper racking ensures maximum storage efficiency. At Apex Scientific, we provide:
- Standard racks for common vial and box sizes
- Custom racks for unique storage needs
- Sliding and fixed racks for better accessibility
Choosing Between Antech Scientific and Arctiko Ultra-Low Freezers
| Feature | Antech | Arctiko |
| Cooling Technology | Cascade & economic dual compressor | Inverter-based dual compressor |
| Energy Efficiency | Standard | High (inverter-driven) |
| Temperature Stability | Excellent | Excellent |
| Multi-Voltage Compatibility | No | Yes |
| Best for | High-performance labs with heavy usage | Energy-conscious labs requiring global voltage adaptability |
Additional Features to Consider
- Eco-Friendly Refrigerants – Reduces environmental impact
- Smart Monitoring Systems – Wi-Fi & cloud-based alerts for real-time tracking
- Door Locks & Security – Prevents unauthorized access
Applications of Ultra-Low Freezers
- Biomedical Research – DNA, RNA, protein, and enzyme preservation
- Pharmaceutical Storage – Vaccines, biologics, and pharmaceuticals
- Clinical Laboratories – Patient sample storage
- Industrial & Chemical Storage – Long-term preservation of sensitive compounds
Conclusion: Find the Best Ultra-Low Freezer for Your Needs
Choosing the right ultra-low freezer depends on your laboratory’s specific requirements:
- Need rapid cooling and high performance? → Choose Antech Scientific Cascade Systems
- Looking for affordability and durability? → Opt for Antech’s Economic Dual Compressor Models
- Want energy savings and multi-voltage capability? → Arctiko’s Inverter-Based Freezers are ideal
At Apex Scientific, we provide high-quality ULT freezers and custom storage solutions. Contact us today for expert advice and tailored recommendations!
