Small Laboratory Freezer LDF-21

Name: Small Laboratory Freezer LDF-21
Brand: Labotemp
SKU: LDF-21
Price: 3122.00 USD
Availability: InStock
Rating: 4.8 (782 reviews)

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 R-170 (Ethane) 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.

$3122

Datasheet

General Specifications
Product Type : Portable Ultra Low Temperature Freezer Product Type	Portable Ultra Low Temperature Freezer
Storage Volume : 25 L Storage Volume	25 L
Temperature Range : +18°C to -45°C Temperature Range	+18°C to -45°C
Cooling Technology : Free Piston Stirling Cooler Cooling Technology	Free Piston Stirling Cooler
Refrigerant : Helium (He) Refrigerant	Helium (He)
Heat Transport System : Gravity-Driven Thermosiphon Heat Transport System	Gravity-Driven Thermosiphon
Display : Digital Temperature Display Display	Digital Temperature Display
Control Sensor : One RTD (PT100 Class B), Precision ±0.3 Control Sensor	One RTD (PT100 Class B), Precision ±0.3
Operating Environment : 5°C to 35°C, ≤80% RH, Altitude ≤2000 m Operating Environment	5°C to 35°C, ≤80% RH, Altitude ≤2000 m
Net Weight : 17.5 kg Net Weight	17.5 kg
Performance & Temperature Control
Cooling Performance : 25°C to -45°C in approximately 1.5 hours Cooling Performance	25°C to -45°C in approximately 1.5 hours
Temperature Stability : Target Temperature ±1°C Temperature Stability	Target Temperature ±1°C
Steady-State Energy Consumption : 30 W (Ambient 25°C) Steady-State Energy Consumption	30 W (Ambient 25°C)
Noise Level : <50 dB Noise Level	<50 dB
Defrost Method : Manual Defrost Method	Manual
Temperature Alarm : Setpoint ±10°C Temperature Alarm	Setpoint ±10°C
Electrical & Construction
Power Supply : 100–240 V AC, 50/60 Hz; 12–24 V DC Power Supply	100–240 V AC, 50/60 Hz; 12–24 V DC
Maximum Power Consumption : 100 W (0.5 A @ 220 V, 0.45 A @ 240 V) Maximum Power Consumption	100 W (0.5 A @ 220 V, 0.45 A @ 240 V)
Insulation : High-Performance Vacuum Insulated Panels with Polyurethane Foam Insulation	High-Performance Vacuum Insulated Panels with Polyurethane Foam
Security : Lockable Lid Security	Lockable Lid
Dimensions & Packaging
Internal Dimensions (L × W × D) : 300 × 250 × 300 mm Internal Dimensions (L × W × D)	300 × 250 × 300 mm
External Dimensions (L × W × D) : 616 × 392 × 455 mm External Dimensions (L × W × D)	616 × 392 × 455 mm
Shipping Dimensions (L × W × D) : 710 × 480 × 533 mm Shipping Dimensions (L × W × D)	710 × 480 × 533 mm
Shipping Weight : 21 kg Shipping Weight	21 kg

Stirling Freezer ➤ Stirling Freezer
Advanced Free Piston Stirling cooling technology ensures compressor-free, highly efficient cooling.  ➤ Advanced Free Piston Stirling cooling technology ensures compressor-free, highly efficient cooling.
Achieves a temperature range from +18°C to -45°C with precise temperature control. ➤ Achieves a temperature range from +18°C to -45°C with precise temperature control.
Rapid pull-down performance, cooling from 25°C to -45°C in approximately 1.5 hours. ➤ Rapid pull-down performance, cooling from 25°C to -45°C in approximately 1.5 hours.
Maintains stable cabinet temperature with ±1°C temperature stability. ➤ Maintains stable cabinet temperature with ±1°C temperature stability.
Operates on both 100–240 V AC and 12–24 V DC, enabling laboratory and vehicle operation. ➤ Operates on both 100–240 V AC and 12–24 V DC, enabling laboratory and vehicle operation.
Utilizes 100% natural Helium (He) refrigerant for environmentally friendly operation. ➤ Utilizes 100% natural Helium (He) refrigerant for environmentally friendly operation.
Gravity-driven thermosiphon heat transfer system delivers reliable and maintenance-efficient cooling. ➤ Gravity-driven thermosiphon heat transfer system delivers reliable and maintenance-efficient cooling.
High-performance vacuum insulated panels with polyurethane foam minimize heat loss and improve energy efficiency. ➤ High-performance vacuum insulated panels with polyurethane foam minimize heat loss and improve energy efficiency.
Low power consumption of approximately 30 W during steady-state operation at -45°C. ➤ Low power consumption of approximately 30 W during steady-state operation at -45°C.
Quiet operation with a noise level of less than 50 dB. ➤ Quiet operation with a noise level of less than 50 dB.
Equipped with a precision PT100 RTD temperature sensor for accurate temperature monitoring. ➤ Equipped with a precision PT100 RTD temperature sensor for accurate temperature monitoring.
Lockable lid enhances sample security during storage and transportation. ➤ Lockable lid enhances sample security during storage and transportation.
Temperature alarm alerts users when the cabinet temperature deviates from the set point. ➤ Temperature alarm alerts users when the cabinet temperature deviates from the set point.
Manual defrost system simplifies maintenance. ➤ Manual defrost system simplifies maintenance.
Compact and lightweight design (17.5 kg) allows easy transport and field deployment. ➤ Compact and lightweight design (17.5 kg) allows easy transport and field deployment.
Suitable for biological samples, vaccines, pharmaceuticals, clinical specimens, and cold-chain transportation. ➤ Suitable for biological samples, vaccines, pharmaceuticals, clinical specimens, and cold-chain transportation.

Clinical Laboratories:Provides reliable ultra-low temperature storage and transport of clinical specimens, blood samples, and diagnostic materials 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 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 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 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 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 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 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 Emergency Medical Services
Provides dependable cold storage for emergency transport of biological specimens and temperature-sensitive medical materials