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Stirling Ultracold SU780XLE Ultra-Low Temperature Freezer
Not all ultralow freezers rely on compressors to protect valuable biological samples. The Stirling Ultracold SU780XLE Ultra-Low Temperature Freezer uses an innovative free-piston Stirling engine, delivering dependable ultra-low temperature storage with exceptional energy efficiency, quiet operation, and remarkably simple mechanical design. For laboratories looking to reduce operating costs without compromising sample protection, the SU780XLE offers a fundamentally different approach to long-term cold storage.
With 27.5 cubic feet (780 liters) of storage capacity and room for up to 600 standard 2-inch cryoboxes, the SU780XLE is well suited for biobanks, biotechnology companies, pharmaceutical manufacturers, hospitals, universities, and research laboratories storing valuable biological materials at temperatures from -20°C to -86°C.
Laboratories building a complete cold storage program often pair ultralow freezers with laboratory refrigerators for day-to-day reagent storage and laboratory freezers for materials that do not require ultra-low preservation. Purchasing a professionally refurbished Stirling Ultracold freezer from American Instrument Exchange allows laboratories to benefit from one of the industry's most energy-efficient ULT platforms while significantly reducing capital equipment costs.
Stirling Ultracold SU780XLE Ultra-Low Temperature Freezer Key Features
27.5 cu. ft. (780 L) storage capacity
Holds up to 600 standard 2-inch cryoboxes
Adjustable temperature range from -20°C to -86°C
Free-piston Stirling engine technology
Compressor-free refrigeration system
ENERGY STAR® certified design
Natural refrigerants
Quiet operation
Low heat rejection
Touchscreen control interface
Advanced alarm and monitoring system
Refurbished and performance tested by American Instrument Exchange
90-day warranty included
Stirling Ultracold SU780XLE Ultra-Low Temperature Freezer Overview
Unlike conventional cascade compressor systems, the SU780XLE is powered by a free-piston Stirling engine that continuously modulates cooling output instead of cycling compressors on and off. Because the engine contains only a few moving components supported by gas bearings, mechanical wear is dramatically reduced while temperature stability remains exceptionally consistent. The result is a refrigeration system that combines dependable ultra-low performance with excellent energy efficiency and long-term reliability.
Modern laboratory workflows rarely rely on a single instrument. Samples are commonly prepared inside biosafety cabinets, cultured in CO₂ incubators, processed using refrigerated centrifuges, and ultimately transferred into an ultralow freezer for long-term preservation. The SU780XLE provides dependable long-term storage while reducing electrical demand, laboratory heat load, and environmental impact.
Common Applications
The Stirling Ultracold SU780XLE is commonly used for long-term preservation of DNA and RNA libraries, stem cells, cell lines, tissue specimens, plasma, serum, vaccines, pharmaceutical compounds, microbiological collections, clinical trial materials, forensic evidence, and biological reference standards.
Its large storage capacity makes it particularly well suited for centralized laboratory storage, university core facilities, pharmaceutical development programs, biobanks, and GMP manufacturing environments. Laboratories requiring colder storage than traditional laboratory freezers often select ultralow freezers to provide an additional level of protection for irreplaceable biological materials.
Ideal Laboratory Types
The SU780XLE is well suited for:
Biotechnology laboratories
Pharmaceutical manufacturers
Academic research institutions
Hospitals and clinical laboratories
Public health laboratories
Government research facilities
Contract research organizations
Biobanks
Cell and gene therapy laboratories
GMP manufacturing facilities
Its low particle generation and ISO Class 6 cleanroom certification also make it attractive for controlled manufacturing environments.
Temperature Recovery & Sample Protection
Protecting valuable samples requires more than simply reaching -80°C. The SU780XLE utilizes continuous Stirling engine modulation to recover quickly following routine door openings while maintaining stable cabinet temperatures. Multiple insulated inner doors further reduce cold air loss, allowing laboratory personnel to retrieve only the samples they need while minimizing temperature disturbance throughout the remainder of the cabinet.
Laboratories preserving especially valuable biological collections often complement ultralow freezers with cryogenic storage systems for applications requiring liquid nitrogen storage.
Typical Stored Materials
The Stirling Ultracold SU780XLE is commonly used to store:
DNA and RNA libraries
Cell lines
Stem cells
Tissue specimens
Plasma and serum
Vaccines
Protein samples
Enzymes
Pharmaceutical compounds
Clinical trial materials
Microbial cultures
Biological reference materials
Stirling Ultracold SU780XLE Ultra-Low Temperature Freezer Key Specifications
Capacity
27.5 cu. ft. (780 L)
Up to 600 standard 2-inch cryoboxes
Temperature Range
Adjustable from -20°C to -86°C
Refrigeration System
Free-piston Stirling engine
Compressor-free refrigeration
Natural refrigerants
Monitoring & Controls
Touchscreen interface
Alarm and monitoring system
Remote monitoring capability
Interior Configuration
Multiple insulated inner doors
Compatible with standard cryobox rack systems
Electrical Requirements
Universal voltage operation (100–240V)
Energy Efficiency & Operating Costs
Energy efficiency is one of the defining characteristics of the SU780XLE. The free-piston Stirling engine consumes substantially less electricity than many conventional compressor-based ultralow freezers while generating significantly less heat inside the laboratory. Lower plug loads can reduce HVAC demand, helping laboratories decrease both direct electrical costs and secondary cooling costs. The compressor-free design also minimizes mechanical wear, supporting dependable long-term operation with fewer moving components.
Specifications compiled from Stirling Ultracold manufacturer literature and American Instrument Exchange product information.
Refurbishment & Testing Process
Every Stirling Ultracold SU780XLE received by American Instrument Exchange undergoes a comprehensive inspection and extended performance evaluation before shipment. Our technicians verify pull-down performance, confirm temperature stability throughout the operating range, inspect the Stirling engine cooling system, test alarms and electronic controls, evaluate door gaskets and cabinet insulation, verify monitoring functions, and thoroughly clean the freezer before delivery.
The Stirling Ultracold SU780XLE ships by freight from American Instrument Exchange. Before delivery, laboratories should verify doorway clearances, floor loading capacity, electrical service, and ventilation requirements. Universal voltage capability and lower heat output provide additional flexibility when installing the freezer in existing laboratories or expanding cold storage capacity.
Frequently Asked Questions
What makes the Stirling SU780XLE different from a traditional compressor-based ultralow freezer?
The SU780XLE uses a free-piston Stirling engine instead of cascade compressors. This unique design provides continuous cooling modulation, fewer moving mechanical components, quieter operation, and significantly lower energy consumption than many conventional ULT freezers.
Why is the SU780XLE known for its energy efficiency?
The Stirling engine continuously adjusts cooling output rather than cycling compressors on and off. Combined with natural refrigerants and efficient cabinet design, this helps reduce electrical consumption, laboratory heat generation, and overall operating costs.
How is the Stirling engine tested before shipment?
Every refurbished Stirling Ultracold SU780XLE is inspected and performance tested by American Instrument Exchange technicians to verify pull-down performance, temperature stability, alarm functionality, Stirling engine operation, and overall system performance before shipment.
Are boxes and/or racks included with the purchase of a Striling Ultracold SU780XLE?
While we may have storage racks available, they are generally not included in the standard purchase of any of our ultralow freezers. Please call or email us for pricing and availability.
How do you test the Stirling SU780XLE to insure proper functionality?
Our technicians run each ultralow freezer in our shop for an extended period of time (anywhere from seven to twenty days, depending on make, model, customer preference, performance history, etc.) to make sure that the unit reaches and holds temperature at the set point. We typically test these units on an empty load, meaning that there are no samples in the chamber during testing. We also examine each SU780XLE for signs of wear, corrosion, or damage, and verify other key performance specifications such as recovery time after door opening, built-in data logging, and other functions.
How does the Stirling SU780XLE operate so efficiently?
Stirling ultracold freezers feature a piston-free engine that continually modulates and eliminates the on-off cycle of a traditional, dual-stage compressor-based system. Combined with the thin-wall, vacuum insulated panels, this provides for efficiency along with quiet operation and quick recovery time. According to manufacturer specifications labs can expect to see energy savings of 70% to 75%.
Is this ultralow freezer compatible with LN2 backup systems for emergency use?
A: Yes, both LN2 and CO2 back-up systems can be purchased for installation with the Stirling SU780XLE ultralow freezer.
CLICK HEREto see the Stirling Ultracold SU780XLE Ultra-low Freezer on our YouTube channel
Testing Procedures for Used and Refurbished Laboratory Equipment
Ensure Accuracy, Safety, and Dependable Performance Across Applications
At American Instrument Exchange, all used and refurbished laboratory equipment undergoes a rigorous, multi-point testing protocol to ensure optimal performance, operational safety, and long-term reliability. Whether the equipment is destined for research, diagnostics, quality control, or production environments, our thorough inspection and testing process is designed to meet the highest standards of laboratory excellence.
Why Testing Used Lab Equipment Is Essential
Before any refurbished laboratory equipment is returned to service, it must be carefully tested to verify:
• Functional integrity and operational performance
• Setpoint accuracy and repeatability (where applicable)
• User interface responsiveness and control features
Proper testing reduces the risk of equipment failure, measurement inaccuracies, or user hazards—helping to ensure consistent results in clinical, academic, biotech, and industrial labs.
Our standardized lab equipment testing procedures are tailored to each equipment type, ensuring every unit meets manufacturer specifications and industry benchmarks.
Key Testing Procedures for Refurbished and Used Laboratory Equipment
1. Initial Visual Inspection
• Examine equipment housing for signs of wear, corrosion, or damage
• Check ports, power cords, and exterior components for tampering or deterioration
• Verify that internal and external parts (racks, shelves, connectors, accessories) are present and undamaged
2. Functional Startup and Operational Testing
• Power on the equipment and verify startup diagnostics
• Confirm functionality of displays, buttons, switches, and control panels
• Run basic functions to confirm proper response and behavior under standard operating conditions
3. Testing and Performance Verification
• Test internal sensors or control systems using industry-standard tools
• Perform operational tests to validate accuracy and consistency
• Verify key performance specifications such as temperature control, timing, speed, or measurement outputs, depending on equipment type
4. Mechanical and Electrical System Testing
• Evaluate motors, pumps, fans, or other moving parts for smooth operation
• Inspect and test wiring, relays, fuses, and circuit boards for safety and reliability
• Test power delivery and grounding compliance
5. Safety and Compliance Checks
• Ensure equipment is grounded and insulated to meet laboratory safety standards
• Test alarms, interlocks, emergency stops, or safety shutdown systems if applicable
6. Final Quality Assurance and Documentation
• Perform extended runtime testing
• Document operational logs, testing results, and any repairs or adjustments made
• Complete a final inspection, thorough cleaning, and packaging for delivery
Trusted Quality from American Instrument Exchange
With over 50 years of experience in laboratory equipment refurbishment, American Instrument Exchange is committed to delivering certified, lab-ready instruments backed by expert testing. Our testing protocols ensure that each piece of equipment—regardless of type—is safe, accurate, and dependable from day one.
Whether you're equipping a startup lab or expanding a high-throughput facility, you can count on our refurbished laboratory equipment to perform with precision and reliability.
Refurbishment Protocol for Used Laboratory Equipment from American Instrument Exchange
At American Instrument Exchange, every piece of used laboratory equipment we offer undergoes a multi-step refurbishment process. Whether it's an analytical balance, centrifuge, freezer, oven, or any other essential lab instrument, our goal is to restore each unit to peak performance—ensuring accuracy, safety, and long-term reliability in scientific, clinical, industrial, and academic environments.
Why Choose Refurbished Lab Equipment from American Instrument Exchange?
• Thoroughly tested for performance, precision, and safety
• Backed by a warranty
• A cost-effective alternative to new equipment
• Environmentally sustainable through equipment reuse and waste reduction
• Serviced by expert technicians with decades of laboratory equipment experience
Step-by-Step Refurbishment Protocol
Every instrument and system refurbished at American Instrument Exchange follows a detailed, industry-aligned process:
1. Initial Intake & Inspection
• Complete visual and structural inspection for cosmetic damage, wear, or corrosion
• Mechanical assessment of hinges, seals, fasteners, motors, and moving parts
• Missing components and damaged items are documented for repair or replacement
2. Cleaning and Decontamination
• Full internal and external cleaning using non-abrasive, lab-safe solutions
• Removal of biological, chemical, or particulate contamination
• Disassembly and cleaning of removable parts such as trays, shelves, and filters
3. Mechanical and Electrical Repair
• Replacement or repair of worn or broken mechanical parts
• Evaluation and servicing of control panels, sensors, switches, and displays
• Testing and repair of electrical wiring, fuses, circuit boards, and power supplies
4. Functional System Testing
• Assessment of all major functions specific to the equipment type (e.g., speed, temperature, force, weight, timing)
• Operation of control interfaces, programming menus, and digital displays
• Verification of stabilization time, responsiveness, and user input reliability
5. Testing and Performance Verification
• Testing of internal sensors, controllers, and measurement systems using certified tools
• Multi-point testing to ensure repeatability, accuracy, and performance consistency
• Confirmation of user-defined setpoints, timing sequences, or programmable cycles
6. Safety and Compliance Checks
• Testing of safety interlocks, alarms, and over-limit protection systems (as applicable)
• Electrical safety inspections, including grounding and insulation verification
7. Final Quality Assurance and Documentation
• Full operational testing under simulated lab conditions
• Completion of performance benchmarks, testing results, and repair logs
• Final cleaning and visual inspection
Trust the Experts at American Instrument Exchange
With over 50 years of experience in the laboratory equipment industry, American Instrument Exchange is a trusted leader in high-quality refurbished lab instruments. Our refurbishment protocols ensure that every piece of equipment we sell is lab-ready—offering the precision, performance, and durability your team can count on.
Whether you’re outfitting a new lab or expanding an existing operation, choose American Instrument Exchange for tested, warrantied, and cost-effective laboratory equipment.
Warranty Information
All used equipment sold by American Instrument Exchange is refurbished/reconditioned, tested to meet specifications, cleaned, and comes with a 90-day warranty from the date of shipment unless otherwise specified. New products include a warranty from the manufacturer. Your warranty is only valid if you have paid your invoice. If your invoice is over 30 days old, warranty work will not be performed until your invoice is paid in full. American Instrument Exchange is not liable for any special or consequential damages that result from the use of, or the inability to use, the materials on this site or the performance of the products,
Exceptions include international sales and items that are agreed to be sold with a lesser warranty or items that are agreed to be sold “as is.”
Should there be visible shipping damage to packaging or concealed shipping damage to item(s) supplied, buyer must communicate such damage to the delivering entity or carrier upon receipt first and to American Instrument the same day item is accepted / signed for. Failure to do so voids warranty. Customer decision to involve / procure third party or OEM service other than American Instrument or AIE assigned vendors to resolve in-warranty instrument failure or defect without first placing a service call to American Instrument voids warranty.
Return & Cancellation Policy
American Instrument Exchange will authorize the return of and issue a full refund for any equipment that is not working as represented and could not be replaced or repaired to the customer’s satisfaction by AIE or a representative of AIE during the warranty period. Returns without prior authorization and an RMA number will not be accepted.
Customers are responsible for proper packaging of the equipment and all included accessories. American Instrument will pay for insurance and shipping costs. Non-inventory items bought specifically to fill customer orders may possibly be returned, but on a case by case basis.
Customers who cancel orders after refurbishing has begun or after delivery where there are no equipment performance issues may be subject to a Restocking/Cancellation Fee of 20% or more and responsible for shipping costs for both the delivery and return.
Ongoing and Extended Support Options
American Instrument Exchange is able to provide additional repair and support services outside the warranty terms for most products that sell.
For biosafety cabinets, clean benches, chemical fume hoods, and other clean air products our team at AIE Laboratory Services can provide certifications, repairs, decontaminations, and other services for customers throughout New England, and guidance and limited technical assistance for any customers in the US and Canada for new or refurbished biosafety cabinets purchased from American Instrument Exchange.
For all other products, the repair service team at American Instrument Exchange can provide both field and depot repair evaluations. We can easily schedule and coordinate the pick-up and transportation of your malfunctioning equipment. By offering hourly rates lower than most OEM service providers and eliminating travel time for technicians, we help reduce repair costs. Furthermore, our lab depot repair service minimizes or eliminates scheduling delays. Our experienced service technicians are qualified to restore your equipment to factory specifications.
Yes, all equipment from American Instrument Exchange comes with a warranty. Used/reconditioned/refurbished equipment is tested to make sure it operates to the manufacturer's specifications and comes with a 90-day warranty (unless otherwise noted). New equipment comes with a warranty from the manufacturer.
How do you test and recondition the equipment?
Testing requirements vary across all the equipment categories we sell. Temperature controlled units are tested with NIST traceable probes and data loggers. Gaskets, external housing, glass, handles, controls and control screens are all thoroughly inspected for integrity and functionality. We test all equipment using the manufacturer's parameters and specifications to confirm that the unit operates properly.
How do products ship from American Instrument Exchange?
We can ship products both nationally and internationally using a well-established network of transporters. Smaller items will ship via UPS. Larger equipment will be palletized and shipped either LTL or air-ride, depending on the specific equipment and/or delivery requirements.
Return and order cancellation policy
American Instrument Exchange will accept the return of any product that is not working as represented and could not be replaced or repaired to the customer's satisfaction during the warranty period. Customers who cancel orders after refurbishing has begun will be subject to a cancellation and restocking fee of between 20% and 40%.
Are discounts available for educational or non-profit institutions, or for bulk purchases?
Yes – call or email us today with a list of equipment you're looking for and we can potentially put together a quote that includes a discount.
How does your price matching policy work?
We strive to keep our pricing competitive and reasonable. If you find comparable items for sale at a lower price from other vendors please send us a link and or quote for the item and we'll do our best to match or beat the price.
Can I see the equipment in person before committing to a purchase?
Customers are welcome to make an appointment to view equipment in our warehouse. Given our workload we may not be able to test or clean the equipment prior to your arrival if you have not committed to an order.
1023 Western Avenue is a working warehouse, not a showroom, and customers should dress appropriately and wear closed toe shoes.
Can I ship products that I purchased elsewhere to American Instrument for repair?
Yes – please see our repair services page for more information.
