Healthcare facility freezer LDF-22

for vaccinesblood banklaboratory

Product overview
Compact portable ultra‑low temperature freezer LDF-22 designed for reliable storage and transport of biological samples, vaccines, pharmaceuticals and research materials. 25 L usable volume, adjustable range up to -60°C with ±1°C stability, PT100 temperature sensing and AC/DC power compatibility for laboratory, clinical and field cold‑chain operations. High‑performance vacuum insulated panels with polyurethane foam reduce heat transfer and improve energy efficiency.

Advanced Stirling cooling technology
The LDF-22 uses a free‑piston Stirling cooler (compressor‑free) that compresses and expands helium in a sealed cycle. This reduces moving parts, vibration and noise, enables rapid pull‑down to -60°C, delivers ±1°C steady‑state control and low steady‑state power (~40 W). The system combines eco‑friendly refrigerant, intelligent temperature monitoring and a simple Stirling structure for long service life and low maintenance.

Key features

• Free‑piston Stirling cooling: compressor‑free ultra‑low temperature refrigeration with low vibration and noise
• Portable cold‑chain design: 25 L capacity with 100–240 V AC and 12–24 V DC compatibility for mobile use
• Energy‑efficient insulation: vacuum insulated panels plus polyurethane foam
• Rapid pull‑down: fast cooling to minimise sample exposure time
• Low noise operation: <55 dB for minimal disturbance in labs and clinics
• Precision control: RTD PT100 sensor with target stability ±1°C
• Safety features: lockable lid and integrated warm/cold alarms (setpoint ±10°C)
• Maintenance friendly: simple Stirling mechanism for long operational life

Applications

• Biological sample storage
  Ultra‑low temperature preservation of specimens, tissues and research samples.
• Pharmaceutical cold chain
  Safe storage and transport of vaccines, biologics and temperature‑sensitive medicines.
• Clinical laboratories
  Secure handling and transport of diagnostic specimens.
• Biotechnology research
  Preservation of DNA, RNA, proteins, enzymes and cell cultures.
• Blood banks
  Temporary storage and transport of plasma and blood components.
• Healthcare facilities
  Cold storage for patient samples and critical supplies.
• Research institutes & universities
  Stable ULT conditions for valuable research specimens.
• Field research & environmental monitoring
  Mobile preservation of samples from remote locations.
• Industrial low‑temperature testing
  Controlled ULT environments for materials testing.
• Portable cold‑chain logistics
  Mobile transport of temperature‑sensitive products while maintaining the cold chain.

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: Gravity‑driven thermosiphon
• Operating environment: 5°C to 35°C, ≤80% RH, altitude ≤2000 m
• Internal dimensions (L × W × H): 300 × 250 × 300 mm
• External dimensions (L × W × H): 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), accuracy ±0.3
• Steady‑state power 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 × H): 710 × 480 × 530 mm
• Shipping weight: 21 kg