Healthcare facility freezer LDF-22

for vaccinesblood banklaboratory

Product Overview
Labotemp Portable Laboratory Stirling Freezer LDF-22 is a compact portable ultra‑low temperature freezer designed for reliable storage and transport of biological samples, vaccines, pharmaceuticals and research materials. It offers 25 L storage, adjustable temperatures down to -60°C with ±1°C stability, PT100 temperature sensing, and compatibility with 100–240 V AC and 12–24 V DC vehicle power for mobile cold‑chain operations. High‑performance vacuum insulated panels combined with polyurethane foam reduce heat transfer and improve energy efficiency.

Advanced Stirling Cooling Technology
The LDF-22 uses a free‑piston Stirling cooling engine that compresses and expands helium in a sealed cycle. This compressor‑free design reduces moving parts, vibration and noise, lowers maintenance demand, enables rapid pull‑down to -60°C and maintains stable operation at approximately 40 W steady‑state power. The system utilises eco‑friendly helium refrigerant and vacuum insulation for sustained ultra‑low temperature performance.

Key Benefits

• Compressor‑free Stirling cooling for quiet, low‑vibration ULT performance
• Portable 25 L cold‑chain solution with AC/DC power options for lab and field use
• Energy‑efficient operation via vacuum insulation and natural refrigerant

Features

• Free piston Stirling cooling technology for compressor‑free ultra‑low temperature refrigeration
• Suitable for storage and transport of biological samples, pharmaceuticals, vaccines and reagents
• Temperature range to -60°C with ±1°C control accuracy
• Compact, lightweight design for transport between labs, clinics and field sites
• Rapid pull‑down to minimize sample exposure time
• Stable internal environment for reliable specimen preservation
• AC mains and DC vehicle power compatibility (100–240 V AC / 12–24 V DC)
• Natural helium refrigerant
• High‑performance vacuum insulated panels with polyurethane foam
• Low‑noise operation (<55 dB)
• Precision temperature control, integrated alarm and lockable lid
• Maintenance‑friendly Stirling engine with long operational life

Applications

• Biological sample storage (specimens, tissues, research samples)
• Pharmaceutical cold chain: vaccines, biologics and temperature‑sensitive medicines
• Clinical laboratories and diagnostic specimen handling
• Biotechnology research: DNA, RNA, proteins, enzymes and cell cultures
• Blood banks: temporary storage and transport of blood components
• Healthcare facilities: patient samples and critical supplies
• Research institutes and universities
• Field research and environmental monitoring
• Industrial low‑temperature testing and materials research
• Portable cold‑chain logistics and mobile transport

Technical specifications

• Product Type: Portable Ultra Low Temperature Freezer
• Storage Volume: 25 L
• Temperature Range: +18°C to -60°C
• Cooling Technology: Free Piston Stirling Cooler
• Refrigerant: Helium (He)
• Heat Transport System: Gravity‑Driven Thermosiphon
• Operating Environment: 5°C to 35°C, ≤80% RH, Altitude ≤2000 m
• Internal Dimensions (L × W × D): 300 × 250 × 300 mm
• External Dimensions (L × W × D): 616 × 392 × 455 mm
• Net Weight: 17.5 kg
• Cooling Performance: 25°C to -60°C ≈ 2.5 hours
• Temperature Control Accuracy: ±1°C
• Temperature Sensor: RTD (PT100 Class B), Precision ±0.3
• Steady‑State Energy Consumption: 40 W
• Noise Level: <55 dB
• Warm & Cold Alarm: Setpoint ±10°C
• Defrost Method: Manual
• Power Supply: 100–240 V AC, 50/60 Hz; 12–24 V DC
• Maximum Power Consumption: 100 W (0.5 A @ 220 V, 4.6 A @ 24 V)
• Insulation: Vacuum Insulated Panels + Polyurethane Foam
• Security: Lockable Lid
• Shipping Dimensions (L × W × D): 710 × 480 × 530 mm
• Shipping Weight: 21 kg