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Seward Stomacher 3500 Jumbo Lab Blender – Used and Refurbished
The Seward Stomacher 3500 Jumbo Lab Blender is a heavy-duty, large-volume laboratory paddle blender designed for homogenization, extraction, washing, and sample preparation in food microbiology, environmental testing, pharmaceutical quality control, industrial laboratories, and other applications requiring substantially greater processing capacity than a conventional laboratory blender.
Part of Seward's large-volume Stomacher platform, the 3500 can accommodate up to 3500 mL of sample and diluent in a disposable Stomacher bag. This makes it particularly useful for large food samples, powders, sterility testing, bulk extraction procedures, and applications where the complete washing solution or extraction liquid needs to be retained for downstream analysis.
Unlike a conventional blade blender, the Stomacher 3500 processes samples using reciprocating paddles acting against the outside of a sealed disposable bag. The paddles crush, wash, mix, and circulate the sample without direct contact between the specimen and the instrument. This bag-based approach reduces cleanup between samples and helps limit cross-contamination in microbiology and analytical laboratories.
The Stomacher 3500 provides three selectable paddle speeds of approximately 125, 150, and 175 rpm along with fixed 30-, 60-, and 120-second processing cycles and continuous operation. Adjustable paddle clearance allows the blending action to be adapted to different sample characteristics.
This Seward Stomacher 3500 is used and refurbished by American Instrument Exchange. AIE technicians test the blender before shipment to verify paddle operation, speed selection, timer functions, controls, door operation, and general mechanical condition. The instrument is thoroughly cleaned and includes a 90-day warranty.
30-, 60-, and 120-second timer settings plus continuous operation
Adjustable 0–20 mm paddle clearance
Continuous-duty construction
Suitable for large-volume blending, washing, and extraction
Useful for food microbiology, sterility testing, and industrial sample preparation
Large 380 × 508 mm Stomacher bag format
Used and refurbished by American Instrument Exchange
90-day warranty included
Overview
The Stomacher 3500 was developed for laboratory procedures that exceed the practical capacity of standard benchtop paddle blenders.
Where a Stomacher 400 is optimized for smaller routine microbiological samples, the 3500 provides the chamber size and paddle capacity necessary to process substantially larger specimens and extraction volumes.
A sample is placed inside a large disposable Stomacher bag along with the appropriate diluent, washing solution, or extraction fluid. The bag is positioned inside the instrument, where reciprocating paddles repeatedly compress and manipulate its contents.
This mechanical action mixes, washes, and homogenizes the specimen while the sample remains completely contained within the bag.
For applications involving large food specimens, powders, bulk materials, disposable products, or other high-volume samples, this approach can provide an efficient alternative to reusable blender vessels.
Common Applications
The Seward Stomacher 3500 can support large-volume food microbiology, food-safety testing, sample extraction, powder blending, sterility testing, microbiological sample preparation, pharmaceutical quality control, industrial testing, environmental analysis, and other procedures requiring high-capacity paddle blending.
Typical materials may include meat and poultry products, chocolate, powders, dry ingredients, prepared foods, disposable products, pharmaceutical materials, environmental samples, and other compatible specimens.
The instrument performs sample preparation rather than the final analytical measurement. Prepared homogenates or extracts can subsequently be analyzed using the microbiological, chemical, molecular, microscopic, or other analytical method required by the laboratory.
Ideal Laboratory Types
The Stomacher 3500 is well suited to food and beverage testing laboratories, commercial microbiology laboratories, food manufacturers, meat and poultry processors, pharmaceutical quality-control laboratories, industrial laboratories, environmental testing facilities, contract analytical laboratories, research institutions, public-health laboratories, and facilities performing large-volume sample extraction.
Its heavy-duty construction is particularly valuable where large samples must be processed repeatedly throughout the working day.
Key Specifications
Specification
Details
Manufacturer
Seward
Product Family
Stomacher 3500
Model
Stomacher 3500 Jumbo
Equipment Type
Large-Volume Paddle Blender / Homogenizer
Maximum Recommended Capacity
3500 mL
Recommended Capacity
1000–3500 mL
Broader 3500 Family Range
400–3500 mL
Paddle Speeds
125 / 150 / 175 rpm
Speed Modes
Low / Normal / High
Timer Settings
30 / 60 / 120 Seconds / Continuous
Paddle Clearance
0–20 mm
Bag Dimensions
Approx. 380 × 508 mm
Duty Cycle
Continuous
Maximum Recommended Sample Temperature
60°C
Recommended Ambient Temperature
10–35°C
Dimensions
Approx. 480 × 480 × 445 mm
Approx. Dimensions
18.9"W × 18.9"D × 17.5"H
Weight
Approx. 36 kg / 79 lb
Electrical
Confirm Individual Unit Nameplate
Condition
Used / Refurbished
Warranty
90 Days from American Instrument Exchange
Large-Volume Sample Processing
The defining advantage of the Stomacher 3500 is its ability to process substantially larger samples than standard laboratory paddle blenders.
Seward specifies a maximum recommended capacity of 3500 mL, with approximately 1000–3500 mL identified as the recommended operating range in its 3500 documentation.
This large capacity can be useful when a laboratory needs to extract organisms or analytes from a substantial specimen, process bulk materials, or retain a relatively large volume of washing solution for subsequent analysis.
Seward also markets the broader 3500 platform for applications beginning around 400 mL, although smaller routine samples are generally better suited to another Stomacher model.
Three Paddle Speeds
The Stomacher 3500 provides three selectable no-load paddle speeds.
LOW operates at approximately 125 rpm, NORMAL at approximately 150 rpm, and HIGH at approximately 175 rpm.
The NORMAL setting is appropriate for many routine applications, while LOW can provide gentler processing for delicate specimens. HIGH provides more aggressive agitation and may be useful for predominantly liquid samples or applications where additional mixing action is beneficial.
Processing conditions should be established according to sample characteristics and the laboratory's analytical procedure.
30-, 60-, and 120-Second Processing Cycles
The Stomacher 3500 provides fixed timer settings of 30 seconds, 60 seconds, and 120 seconds.
These settings make it straightforward to establish consistent processing cycles across multiple samples.
Continuous operation is also available for procedures requiring processing beyond the fixed timer selections.
Standardizing both speed and processing duration can improve repeatability when multiple technicians or laboratories are following the same sample-preparation protocol.
Adjustable Paddle Clearance
Paddle clearance can be adjusted from 0 to 20 mm.
Changing clearance alters how the paddles interact with the sample-filled bag and allows the blender to accommodate specimens with different physical characteristics.
Dense solids, powders, liquid-dominant mixtures, and heterogeneous food samples may require different mechanical conditions for effective processing.
The appropriate setting should provide sufficient blending action without placing unnecessary stress on the bag.
Disposable Bag Processing
The Stomacher method keeps the sample inside a disposable bag throughout blending.
The 3500 uses large-format bags approximately 380 mm wide × 508 mm long.
Once the specimen and diluent have been loaded, the bag itself becomes the blending chamber. The instrument's paddles act through the bag wall rather than contacting the sample directly.
After processing, the complete homogenate or extraction liquid remains inside the bag for subsequent handling.
Reducing Cross-Contamination
Disposable-bag processing offers an important advantage in microbiological laboratories because consecutive samples do not share the same reusable blending vessel.
With a conventional blade blender, the jar, lid, blade assembly, and other sample-contact surfaces typically require cleaning or sterilization between specimens.
With the Stomacher, a fresh bag provides a new sample-contact surface for each preparation.
Appropriate laboratory technique is still required during loading and downstream sample handling, but the bag-based design can simplify contamination-control procedures considerably.
Retaining the Complete Extract
The Stomacher 3500 platform is particularly useful for applications where the entire washing solution, diluent, or extraction liquid must remain available for analysis.
Because everything is contained inside the bag, the processed sample can be removed from the blender without transferring the contents from a reusable blending vessel.
This can simplify recovery of the complete extract and reduce material loss during sample preparation.
It is one of the reasons Seward positions the 3500 series for large-volume washing and extraction procedures.
Large Food Sample Preparation
Food microbiology is a major application for Stomacher laboratory blenders.
Large food specimens can be combined with an appropriate diluent inside a 3500 bag and processed to release microorganisms into the liquid phase.
The resulting homogenate can then be used for downstream plating, enrichment, dilution, molecular analysis, or other microbiological procedures.
The large capacity makes the 3500 particularly useful when sample size exceeds the range of a conventional 400 mL paddle blender.
Meat and Poultry Applications
Meat and poultry samples may require extensive washing and mechanical manipulation to produce a representative microbiological preparation.
The reciprocating paddle system compresses and circulates the sample with diluent while keeping the specimen enclosed inside the bag.
This can provide effective extraction without exposing a reusable blade assembly directly to raw food material.
Actual sample size, diluent ratio, speed, and processing duration should follow the laboratory's established method.
Powder Blending and Extraction
The Stomacher 3500 is also useful for powders and dry ingredients.
Powdered specimens can be combined with liquid inside a disposable bag and mechanically mixed to create a suspension or extract.
Seward specifically identifies powders as an application for the standard Stomacher 3500 platform.
This can be useful in food, pharmaceutical, industrial, and quality-control laboratories where a large bulk sample must be dispersed or extracted before analysis.
Chocolate and Difficult Food Matrices
Seward has identified chocolate among the applications historically associated with the standard Stomacher 3500.
Dense or heterogeneous food matrices can be difficult to process effectively in small paddle blenders, particularly when substantial sample and diluent volumes are required.
The larger chamber and heavy-duty paddle system provide the mechanical capacity needed for these more demanding preparations.
The optimal operating conditions depend on the physical properties of the individual sample.
Sterility Testing
Another notable application for the 3500 platform is sample preparation associated with sterility testing of disposable products.
Large disposable materials may need to be washed with a substantial volume of extraction fluid so microorganisms or other target material can be recovered for analysis.
A large Stomacher bag can hold both the item and washing solution while the paddles provide mechanical agitation.
The complete washing solution can then be retained for subsequent microbiological testing.
Pharmaceutical and Quality-Control Applications
Pharmaceutical and industrial laboratories can use the Stomacher 3500 for compatible extraction, washing, mixing, and microbiological sample-preparation procedures.
Programmable operating conditions help laboratories process multiple samples using consistent mechanical conditions.
For regulated applications, laboratories should establish their own validated speed, processing time, bag type, sample-to-diluent ratio, and downstream analytical procedure.
Environmental Sample Preparation
Environmental laboratories may also require large-volume washing or extraction of compatible specimens.
Bag-based processing can be advantageous when a substantial volume of liquid needs to be retained after the sample has been mechanically agitated.
Specialized variants of the 3500 platform have historically been developed for environmental applications, illustrating the suitability of this large-format Stomacher design for demanding extraction workflows.
Continuous-Duty Construction
Seward specifies the 3500 platform for continuous-duty operation.
The heavy-duty construction is designed for repeated use in laboratories and industrial testing environments.
For facilities processing large batches of samples, continuous-duty capability reduces the need for extended cooling periods between normal operating cycles.
Users should still follow appropriate operating procedures and inspect bags and the instrument regularly during demanding workflows.
Processing Multiple Bags
Seward documentation indicates that several bags may be processed simultaneously when appropriate, provided the combined volume does not exceed the instrument's maximum capacity.
When multiple bags are used, they should be positioned so the load is distributed evenly across the paddle faces.
This capability may be useful for specialized procedures involving multiple smaller specimens.
Laboratories should validate any multi-bag processing method to ensure adequate and reproducible homogenization.
Standard and Heavy-Duty Bags
Different 3500-series bags are available for different sample requirements.
Standard bags are suitable for routine applications, while heavier-duty configurations can provide additional resistance when processing more challenging specimens.
Seward also offers closure, strainer, and autoclavable bag configurations for the 3500 family.
Bag selection should take into account sample texture, sharp or abrasive materials, processing intensity, and downstream analytical requirements.
Handling Hard or Sharp Samples
Samples containing bone, grit, fruit stones, seeds, or other hard particles can increase the risk of puncturing a disposable bag.
For challenging specimens, a heavy-duty bag or double-bag arrangement may be appropriate.
Laboratories should inspect the specimen before processing and select a bag capable of withstanding the expected mechanical stress.
Bag integrity is particularly important when processing hazardous, biologically sensitive, or contamination-critical samples.
Maximum Recommended Sample Temperature
Seward specifies a maximum recommended sample temperature of 60°C for the 3500 platform.
The standard Stomacher 3500 is a mechanical blender rather than a temperature-controlled instrument.
Samples requiring heating or cooling should be conditioned separately unless the laboratory is using a specialized temperature-equipped Stomacher variant designed for that application.
Sample temperature should remain within the manufacturer's recommended operating conditions during blending.
Stomacher 3500 vs. Stomacher 400
The principal difference between the Stomacher 3500 and Stomacher 400 is processing capacity.
The Stomacher 400 Circulator is optimized for routine samples in approximately the 80–400 mL range.
The Stomacher 3500 is designed for large-volume processing up to 3500 mL.
A laboratory primarily processing conventional microbiology samples may find the 400 more convenient, while the 3500 is better suited to bulk food samples, large-volume extraction, powders, sterility testing, and other applications that require substantially more working capacity.
Stomacher 3500 vs. Conventional Blade Blender
A conventional laboratory blender uses rotating blades that directly contact the sample.
The Stomacher 3500 instead uses external reciprocating paddles to manipulate a sample through a disposable bag.
The Stomacher method eliminates reusable sample-contact blades and vessels from the blending process, reducing cleanup between specimens.
Blade blenders may still be appropriate when cutting or aggressive physical disruption is specifically required.
Stomacher 3500 vs. Rotor-Stator Homogenizer
Rotor-stator homogenizers provide high-shear mechanical disruption and are commonly used when fine particle reduction, emulsification, or cellular disruption is required.
The Stomacher 3500 serves a different purpose.
Its paddle system is particularly useful for washing, extracting, mixing, and homogenizing large specimens in a sealed disposable bag.
The appropriate technology depends on whether the objective is high-shear disruption or reproducible large-volume sample preparation.
Stomacher 3500 Family
The 3500 platform has been adapted by Seward for several specialized applications.
The standard Stomacher 3500 Jumbo is designed for large-volume blending and extraction.
Other versions of the platform include specialized systems for environmental water-testing preparation and heated sample processing.
This AIE listing is for the standard Stomacher 3500 blender and should not be confused with specialized heated or application-specific variants unless those features are physically present on the individual unit.
Large-Format Benchtop Design
The Stomacher 3500 measures approximately 480 mm wide × 480 mm deep × 445 mm high, or about 18.9 × 18.9 × 17.5 inches.
At approximately 36 kg, or 79 pounds, it is substantially larger and heavier than the Stomacher 400.
The instrument should be installed on a stable laboratory bench capable of supporting its weight and the additional load of a full 3.5-liter sample.
Adequate clearance should also be provided for loading large bags and accessing the instrument for cleaning.
Cleaning and Routine Maintenance
Because samples remain inside disposable bags, routine cleaning is generally simpler than with reusable blade blenders.
Nevertheless, spills and bag leakage can occur, particularly when processing hard, abrasive, or oversized samples.
Accessible instrument surfaces and the paddle chamber should be inspected regularly and cleaned according to appropriate laboratory procedures.
Regular inspection of the paddles, door, controls, and surrounding chamber can also help identify wear before it affects performance.
Refurbishment and Testing by American Instrument Exchange
American Instrument Exchange tests used laboratory blenders before shipment to confirm proper operation.
For the Seward Stomacher 3500, AIE technicians evaluate paddle movement, speed selection, timer operation, continuous mode, door operation, controls, and general mechanical and electrical condition.
The paddle chamber, exterior surfaces, and other accessible components are thoroughly cleaned prior to shipment.
Customers with particular operating or testing requirements can contact American Instrument Exchange before shipment. AIE will make reasonable efforts to test the instrument under conditions representative of the intended application.
Why Buy a Refurbished Seward Stomacher 3500?
Large-volume laboratory paddle blenders are specialized instruments, and laboratories may be able to reduce equipment acquisition costs substantially by purchasing a properly tested refurbished unit.
The Stomacher 3500 provides up to 3.5 liters of processing capacity, multiple paddle speeds, timed and continuous operation, adjustable paddle clearance, disposable-bag processing, and heavy-duty construction.
These capabilities make it particularly useful for laboratories that have outgrown conventional 400 mL sample-preparation systems.
American Instrument Exchange tests and cleans the unit before shipment and includes a 90-day warranty.
Shipping and Installation
The Stomacher 3500 weighs approximately 79 pounds before samples are loaded and should be placed on a sturdy, level laboratory bench.
Its approximately 19 × 19-inch footprint requires more working space than smaller Stomacher models, and additional clearance should be provided for bag loading and operator access.
The 3500 platform was manufactured in multiple electrical configurations. Customers should verify the voltage and frequency shown on the individual AIE unit's nameplate before installation rather than assuming the electrical requirements from the model number alone.
Related Equipment
Laboratories using the Seward Stomacher 3500 may also require smaller Stomacher paddle blenders, microbiology incubators, biological safety cabinets, autoclaves, centrifuges, laboratory refrigerators and freezers, water baths, balances, shakers, and other equipment used for microbiological sample preparation and analysis.
American Instrument Exchange supplies used and refurbished laboratory equipment for food-testing laboratories, pharmaceutical companies, environmental laboratories, biotechnology facilities, industrial quality-control laboratories, universities, and other scientific organizations.
Seward Stomacher 3500 Jumbo Lab Blender FAQs
What is the Seward Stomacher 3500?
The Stomacher 3500 is a heavy-duty, large-volume laboratory paddle blender designed for homogenization, washing, extraction, and sample preparation inside disposable bags.
How much sample can the Stomacher 3500 process?
The maximum recommended capacity is 3500 mL. Seward documentation identifies approximately 1000–3500 mL as the recommended range for the 3500 platform.
Can it process volumes below 1000 mL?
The broader 3500 product family is marketed for large-volume applications beginning around 400 mL, but Seward's operating documentation recommends another Stomacher model for smaller volumes. For routine samples below approximately 400 mL, the Stomacher 400 is generally a better choice.
What are the paddle speeds?
The Stomacher 3500 provides LOW, NORMAL, and HIGH settings corresponding to approximately 125, 150, and 175 rpm.
What timer settings are available?
The standard 3500 provides fixed 30-, 60-, and 120-second processing cycles plus continuous operation.
What is the paddle-clearance range?
Paddle clearance can be adjusted from 0 to 20 mm.
Does the Stomacher 3500 use blades?
No. It uses reciprocating paddles to process samples through the walls of disposable bags.
Does the sample contact the blender?
Under normal operation, the sample remains contained inside the disposable Stomacher bag and does not directly contact the paddles.
What size bags does the Stomacher 3500 use?
The 3500 platform uses large bags approximately 380 × 508 mm, or roughly 15 × 20 inches.
Are heavy-duty bags available?
Yes. Seward offers multiple 3500-series bag configurations, including standard, heavy-duty, closure, strainer, and autoclavable versions.
Can multiple bags be processed at once?
Seward documentation allows several bags to be processed simultaneously in appropriate applications as long as the total load remains within the maximum capacity and is distributed properly across the paddles.
Is the Stomacher 3500 suitable for food testing?
Yes. Large-volume food microbiology and food sample preparation are important applications for the standard 3500.
Can it process powders?
Yes. Seward specifically identifies powder blending and extraction among the applications for the Stomacher 3500.
Can it process meat samples?
Yes. Compatible meat and poultry samples can be blended with diluent for downstream microbiological analysis.
Can it be used for chocolate samples?
Yes. Chocolate is among the food matrices historically associated with the standard Stomacher 3500.
Can it be used for sterility testing?
Yes. The large-volume Stomacher platform has applications in preparing disposable products and other compatible specimens for sterility testing.
Does the Stomacher 3500 detect microorganisms?
No. The instrument prepares a homogenate, wash, or extract. Detection or identification is performed by the appropriate downstream microbiological or analytical method.
Is this the Stomacher 3500 Thermo model?
No. This AIE listing is for the standard Stomacher 3500 blender. The Thermo Bioreactor is a specialized version incorporating heating for particular applications.
Is this the Stomacher 3500W Water Biowasher?
No. The Water Biowasher is a specialized 3500 variant developed for processing filter material used in waterborne-parasite testing.
What is the maximum recommended sample temperature?
Seward specifies 60°C as the maximum recommended sample temperature for the 3500 platform.
Is the Stomacher 3500 designed for continuous duty?
Yes. The 3500 platform is specified for continuous-duty operation.
What are the dimensions?
The instrument measures approximately 480 × 480 × 445 mm, or about 18.9"W × 18.9"D × 17.5"H.
How much does it weigh?
The Stomacher 3500 weighs approximately 36 kg, or 79 pounds.
What voltage does it require?
The 3500 platform was manufactured in both 110–120 V and 220–250 V versions. Buyers should verify the electrical nameplate on the individual AIE unit.
Is this Seward Stomacher 3500 refurbished?
Yes. This unit is used and refurbished by American Instrument Exchange.
How does AIE test a used Stomacher 3500?
American Instrument Exchange tests paddle movement, speed settings, timers, continuous operation, controls, door operation, and general mechanical and electrical functionality before shipment.
Does this refurbished Stomacher 3500 include a warranty?
Yes. American Instrument Exchange includes a 90-day warranty with this refurbished laboratory blender.
Click Hereto see the Seward Stomacher 3500 Blender on the American Instrument Exchange 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.
