Labotemp Small Laboratory Freezer LDF-21 combines compact portability with advanced Stirling Freezer technology for dependable ultra-low temperature storage and transportation of temperature-sensitive materials. Designed as a Portable Lab Freezer, it offers a 25 L storage capacity with an operating temperature range from +18°C to -45°C, making it suitable for biological samples, laboratory reagents, vaccines, pharmaceutical products, clinical specimens, and field research applications. The free-piston Stirling cooling engine uses environmentally friendly helium refrigerant to provide stable cooling with ±1°C temperature control, low vibration, and energy-efficient performance while eliminating the need for conventional refrigerants.
Advanced Stirling Cooling Technology
The LDF-21 utilizes an innovative free-piston Stirling cooling system that delivers efficient refrigeration without conventional compressor technology. By using helium as the working gas, the system achieves rapid cooling, precise temperature regulation, and reliable long-term operation with minimal vibration and low noise. Its optimized thermal design maintains stable storage conditions while consuming an average of only 40 W during steady-state operation, helping reduce operating costs. Combined with environmentally friendly refrigerant, integrated temperature alarms, rugged construction, and dependable performance, the LDF-21 offers an efficient solution for laboratories and healthcare professionals requiring secure ultra-low temperature storage in both stationary and mobile environments.
Why Choose Labotemp Portable Laboratory Stirling Freezer LDF-21?
✓ Advanced Stirling Cooling: Free-piston Stirling technology delivers efficient, low-vibration, and compressor-free ultra-low temperature performance.
✓ Portable Laboratory Design: Compact 25 L chamber with AC/DC power compatibility supports laboratory, vehicle, and field operation.
✓ Accurate Temperature Control: Adjustable temperatures from +18°C to -45°C with ±1°C stability ensure dependable sample protection.
| No. | Specification | Value |
|---|---|---|
| General Specifications | ||
| 1 | Product Type | Portable Ultra Low Temperature Freezer |
| 2 | Storage Volume | 25 L |
| 3 | Temperature Range | +18°C to -45°C |
| 4 | Cooling Technology | Free Piston Stirling Cooler |
| 5 | Refrigerant | Helium (He) |
| 6 | Heat Transport System | Gravity-Driven Thermosiphon |
| 7 | Display | Digital Temperature Display |
| 8 | Control Sensor | One RTD (PT100 Class B), Precision ±0.3 |
| 9 | Operating Environment | 5°C to 35°C, ≤80% RH, Altitude ≤2000 m |
| 10 | Net Weight | 17.5 kg |
| Performance & Temperature Control | ||
| 11 | Cooling Performance | 25°C to -45°C in approximately 1.5 hours |
| 12 | Temperature Stability | Target Temperature ±1°C |
| 13 | Steady-State Energy Consumption | 30 W (Ambient 25°C) |
| 14 | Noise Level | <50 dB |
| 15 | Defrost Method | Manual |
| 16 | Temperature Alarm | Setpoint ±10°C |
| Electrical & Construction | ||
| 17 | Power Supply | 100–240 V AC, 50/60 Hz; 12–24 V DC |
| 18 | Maximum Power Consumption | 100 W (0.5 A @ 220 V, 0.45 A @ 240 V) |
| 19 | Insulation | High-Performance Vacuum Insulated Panels with Polyurethane Foam |
| 20 | Security | Lockable Lid |
| Dimensions & Packaging | ||
| 21 | Internal Dimensions (L × W × D) | 300 × 250 × 300 mm |
| 22 | External Dimensions (L × W × D) | 616 × 392 × 455 mm |
| 23 | Shipping Dimensions (L × W × D) | 710 × 480 × 533 mm |
| 24 | Shipping Weight | 21 kg |
Clinical Laboratories:
Provides reliable ultra-low temperature storage and transport of clinical specimens, blood samples, and diagnostic materials.
Biotechnology Research:
Preserves DNA, RNA, enzymes, proteins, cell cultures, and other temperature-sensitive biological samples.
Pharmaceutical Industry:
Ensures safe storage and cold-chain transportation of pharmaceuticals, vaccines, and biologics.
Hospitals & Healthcare Facilities:
Maintains the integrity of critical medical samples during interdepartmental and off-site transportation.
Blood Banks:
Supports secure transportation and temporary storage of blood components and plasma under controlled temperatures.
Public Health & Vaccination Programs:
Facilitates cold-chain logistics for vaccines and biological products during outreach and immunization campaigns.
Field Research & Environmental Studies:
Enables portable preservation of environmental, agricultural, and wildlife samples collected from remote locations.
Emergency Medical Services:
Provides dependable cold storage for emergency transport of biological specimens and temperature-sensitive medical materials.
