Labotemp Portable Laboratory Stirling Freezer LDF-22 is a compact portable freezer engineered for reliable ultra-low temperature storage and transport of biological samples, vaccines, pharmaceuticals, reagents, and research materials. Featuring a 25 L storage capacity, adjustable temperature range from +25°C to -60°C, and ±1°C temperature stability, it provides dependable cold storage for laboratory, clinical, pharmaceutical, and field applications. The high-performance vacuum insulation panels and polyurethane foam insulation minimize heat loss while improving energy efficiency, and the integrated PT100 temperature sensor ensures accurate temperature monitoring. Compatible with both 100–240 V AC and 12/24 V DC vehicle power, the LDF-21 is an ideal solution for mobile laboratories, cold chain transportation, emergency response, and remote scientific operations.
Advanced Stirling Cooling Technology
The LDF-22 is powered by a free-piston Stirling cooling engine, an advanced compressor-free refrigeration system that cools by repeatedly compressing and expanding helium gas within a sealed cycle. This design minimizes moving parts, resulting in lower vibration, quieter operation, and reduced maintenance compared to conventional compressor-based freezers. The Stirling engine delivers rapid pull-down to -60°C, maintains ±1°C temperature stability, and consumes an average of only 40 W during steady operation, making it highly energy efficient. Combined with environmentally friendly refrigerant, high-performance vacuum insulation, and intelligent temperature monitoring, the LDF-22 provides reliable, sustainable, and long-term ultra-low temperature storage for laboratory and cold chain applications.
Why Choose Labotemp Portable Laboratory Stirling Freezer LDF-22?
✓ Stirling Cooling Engine: Compressor-free technology for quiet, efficient, and reliable ultra-low temperature cooling.
✓ Portable Cold Chain Design: 25 L capacity with AC/DC power compatibility for laboratory and field applications.
✓ Energy-Efficient Operation: High-performance vacuum insulation and eco-friendly R-170 refrigerant reduce power consumption while maintaining dependable cooling.
| No. | Specification | Value |
|---|---|---|
| General Specifications | ||
| 1 | Product Type | Portable Ultra Low Temperature Freezer |
| 2 | Storage Volume | 25 L |
| 3 | Temperature Range | +18°C to -60°C |
| 4 | Cooling Technology | Free Piston Stirling Cooler |
| 5 | Refrigerant | Helium (He) |
| 6 | Heat Transport System | Gravity-Driven Thermosiphon |
| 7 | Operating Environment | 5°C to 35°C, ≤80% RH, Altitude ≤2000 m |
| 8 | Internal Dimensions (L × W × D) | 300 × 250 × 300 mm |
| 9 | External Dimensions (L × W × D) | 616 × 392 × 455 mm |
| 10 | Net Weight | 17.5 kg |
| Cooling Performance & Temperature Control | ||
| 11 | Cooling Performance | 25°C to -60°C in approximately 2.5 hours |
| 12 | Temperature Control Accuracy | Target Temperature ±1°C |
| 13 | Temperature Sensor | One RTD (PT100 Class B), Precision ±0.3 |
| 14 | Steady-State Energy Consumption | 40 W |
| 15 | Noise Level | <55 dB |
| 16 | Warm & Cold Alarm | Setpoint ±10°C |
| 17 | Defrost Method | Manual |
| Electrical & Construction | ||
| 18 | Power Supply | 100–240 V AC, 50/60 Hz; 12–24 V DC |
| 19 | Maximum Power Consumption | 100 W (0.5 A @ 220 V, 4.6 A @ 24 V) |
| 20 | Insulation | High-Performance Vacuum Insulated Panels with Polyurethane Foam |
| 21 | Security | Lockable Lid |
| Packaging Information | ||
| 22 | Shipping Dimensions (L × W × D) | 710 × 480 × 530 mm |
| 23 | Shipping Weight | 21 kg |
Biological Sample Storage:
Provides reliable ultra-low temperature preservation of biological specimens, tissues, and research samples.
Pharmaceutical Cold Chain:
Ensures safe storage and transportation of pharmaceuticals, vaccines, biologics, and temperature-sensitive medicines.
Clinical Laboratories:
Maintains the integrity of clinical specimens during storage and transport for diagnostic and research applications.
Biotechnology Research:
Supports the preservation of DNA, RNA, proteins, enzymes, cell cultures, and other sensitive biomaterials.
Blood Banks:
Facilitates the temporary storage and transportation of plasma, blood components, and laboratory reagents under controlled conditions.
Medical & Healthcare Facilities:
Provides dependable cold storage for patient samples, diagnostic materials, and critical medical supplies.
Research Institutes & Universities:
Ideal for laboratory experiments requiring stable ultra-low temperature conditions for valuable research specimens.
Field Research & Environmental Monitoring:
Enables secure preservation of environmental, agricultural, and ecological samples collected from remote locations.
Industrial Temperature Testing:
Suitable for industrial low-temperature simulation and testing of materials requiring controlled ultra-low temperature environments.
Portable Cold Chain Logistics:
Designed for mobile transportation of temperature-sensitive products while maintaining an uninterrupted cold chain.
