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Fisher Isotemp 3724 Low Temperature Incubator
Many laboratory applications require precise incubation at temperatures both above and below ambient conditions. The Fisher Isotemp 3724 Low Temperature Incubator is designed to provide accurate temperature control from -10°C to 60°C, making it an excellent choice for environmental testing, microbiology, food and beverage quality assurance, pharmaceutical research, and biochemical oxygen demand (BOD) analysis. Featuring a 6.1 cubic foot (173 L) chamber, forced-air circulation, microprocessor temperature control, and outstanding temperature stability, the Fisher 3724 delivers dependable performance for laboratories requiring refrigerated incubation as well as conventional warming applications.
Unlike standard laboratory incubators that only heat above ambient temperatures, the Fisher 3724 incorporates an integrated refrigeration system that allows researchers to maintain precise low-temperature conditions for specialized biological and environmental testing. Its corrosion-resistant construction, LED temperature display, adjustable shelving, and compact under-counter footprint make it a versatile solution for laboratories with limited floor space while providing the performance required for demanding research and quality control applications. Purchasing a refurbished Fisher Isotemp 3724 Low Temperature Incubator from American Instrument Exchange provides laboratories with professional refrigerated incubation capabilities at substantial savings compared to purchasing new equipment.
Fisher Isotemp 3724 Low Temperature Incubator Key Features
173 L (6.1 cu. ft.) chamber capacity
Temperature range: -10°C to 60°C
Forced-air convection system
Microprocessor temperature controller
Temperature stability of ±0.2°C
Temperature uniformity of ±0.6°C at 37°C
LED temperature display with 0.1°C resolution
Corrosion-resistant chamber construction
Compact under-counter design
Two adjustable shelves
Interior electrical outlet
Over- and under-temperature alarms
Access port for probes and monitoring equipment
115V electrical operation
90-day warranty from American Instrument Exchange
Designed for Refrigerated Laboratory Incubation
The Fisher Isotemp 3724 is engineered for laboratories requiring precise temperature control across a broad operating range, including temperatures below ambient. Its forced-air convection system continuously circulates conditioned air throughout the chamber, promoting excellent temperature uniformity while minimizing fluctuations that can affect sensitive testing procedures. The integrated refrigeration system allows users to perform applications that cannot be accomplished with conventional heated incubators, including BOD testing, environmental microbiology, and refrigerated stability studies.
Microprocessor controls provide accurate temperature regulation throughout the operating range, while the compact cabinet design maximizes usable chamber space without occupying excessive laboratory floor space. Together, these features make the Fisher 3724 an excellent solution for laboratories performing routine low-temperature incubation alongside traditional microbiological and quality control testing.
Common Applications
The Fisher Isotemp 3724 Low Temperature Incubator is commonly used for:
Biochemical oxygen demand (BOD) testing
Wastewater analysis
Water quality testing
Environmental microbiology
Food and beverage microbiology
Pharmaceutical stability studies
Yeast and fungal culture
Agricultural testing
Seed germination studies
General microbiological incubation
Refrigerated biological research
Quality control testing
The Fisher Isotemp 3724 is frequently incorporated into environmental and microbiology laboratory workflows. Many laboratories pair this refrigerated incubator with laboratory refrigerators for storing prepared media, calibration standards, and temperature-sensitive reagents. Laboratory freezers are commonly used for preserving microbial reference cultures and environmental samples, while centrifugessupport routine sample preparation before incubation.Biosafety cabinets provide a sterile workspace for inoculating microbiological media and processing biological specimens, andautoclavesare routinely used to sterilize culture media and laboratory supplies prior to incubation. Laboratories performing environmental analysis may also utilize water bathsfor warming reagents or conditioning samples before testing.
Ideal Laboratory Environments
The Fisher Isotemp 3724 is an excellent choice for environmental testing laboratories, municipal water treatment facilities, wastewater treatment plants, food and beverage quality assurance laboratories, pharmaceutical quality control departments, agricultural research facilities, university microbiology laboratories, government environmental agencies, and industrial testing laboratories. Its refrigerated operating range and dependable temperature control make it particularly valuable for laboratories performing BOD testing, environmental monitoring, and other procedures requiring stable low-temperature incubation.
Why Choose the Fisher Isotemp 3724 Low Temperature Incubator?
The Fisher Isotemp 3724 offers significantly greater flexibility than a conventional laboratory incubator by combining refrigerated operation with precise heating capability in a single compact system. Laboratories can perform both below-ambient and elevated-temperature applications without requiring multiple pieces of equipment, improving workflow efficiency while reducing laboratory footprint.
Its combination of reliable forced-air circulation, excellent temperature stability, intuitive microprocessor controls, and corrosion-resistant construction makes the Fisher 3724 a dependable choice for environmental testing, microbiology, food safety, pharmaceutical quality assurance, and numerous other laboratory applications where accurate temperature control is essential.
Fisher Isotemp 3724 Low Temperature Incubator Performance and Temperature Stability
The Fisher Isotemp 3724 Low Temperature Incubator is engineered to provide highly stable temperature control across a broad operating range, making it suitable for both refrigerated and conventional incubation applications. Its forced-air convection system continuously circulates conditioned air throughout the chamber, minimizing temperature gradients and promoting excellent uniformity across every shelf. Whether operating at refrigerated temperatures for environmental testing or elevated temperatures for microbiological culture, the incubator delivers dependable thermal performance to support reproducible laboratory results.
Microprocessor-based controls continuously monitor and regulate chamber temperature, while the integrated refrigeration system allows users to maintain temperatures below ambient without sacrificing stability. Rapid temperature recovery following routine door openings helps laboratories maintain consistent incubation conditions throughout the workday, making the Fisher 3724 well suited for busy environmental, microbiology, and quality control laboratories performing routine sample processing.
Fisher Isotemp 3724 Typical Samples and Laboratory Applications
The Fisher Isotemp 3724 supports a wide variety of laboratory testing and research applications requiring refrigerated or controlled-temperature incubation. Typical samples include wastewater samples, drinking water samples, environmental water samples, bacterial cultures, yeast and fungal cultures, prepared microbiological media, food and beverage quality control samples, pharmaceutical stability samples, agricultural specimens, seed germination studies, biological reference materials, and environmental monitoring cultures.
Laboratories commonly utilize the incubator for biochemical oxygen demand (BOD) testing, water quality analysis, environmental microbiology, food safety testing, pharmaceutical quality assurance, refrigerated stability studies, agricultural research, industrial quality control, microbiological culture, and general laboratory incubation procedures where precise low-temperature operation is required.
Fisher Isotemp 3724 Low Temperature Incubator Specifications
Specification
Details
Manufacturer
Fisher Scientific
Model
Isotemp 3724
Equipment Type
Low Temperature Incubator
Chamber Capacity
173 L (6.1 cu. ft.)
Temperature Range
-10°C to 60°C
Temperature Stability
±0.2°C
Temperature Uniformity
±0.6°C at 37°C
Heating System
Forced-Air Convection
Temperature Controller
Microprocessor Digital Controller
Temperature Display
LED Display (0.1°C Resolution)
Chamber Construction
Corrosion-Resistant Interior
Shelves
Two Adjustable Shelves
Interior Outlet
Yes
Access Port
Yes
Safety Features
Over- and Under-Temperature Alarms
Electrical Requirements
115V
Specifications are compiled from manufacturer literature and American Instrument Exchange product information. Specifications may vary depending on production year and factory-installed options. Please verify chamber dimensions, electrical requirements, and included accessories prior to purchase.
Fisher Isotemp 3724 Low Temperature Incubator Frequently Asked Questions
What is a low temperature incubator used for?
Low temperature incubators are designed for laboratory applications requiring temperatures below ambient, including biochemical oxygen demand (BOD) testing, environmental microbiology, water quality analysis, food safety testing, refrigerated stability studies, and other controlled-temperature research procedures.
Why choose a refrigerated incubator instead of a standard laboratory incubator?
Unlike standard incubators that only heat above ambient temperature, refrigerated incubators provide both cooling and heating capabilities, allowing laboratories to perform a much broader range of testing protocols within a single instrument.
Is the Fisher Isotemp 3724 suitable for BOD testing?
Yes. The broad operating temperature range, precise temperature control, and excellent stability make the Fisher Isotemp 3724 well suited for biochemical oxygen demand (BOD) testing performed by environmental and wastewater laboratories.
How does forced-air convection improve incubation performance?
Forced-air circulation continuously distributes conditioned air throughout the chamber, improving temperature uniformity, reducing hot and cold spots, and providing more consistent incubation conditions across all shelves.
Can this incubator be used for microbiological culture?
Yes. The Fisher Isotemp 3724 is commonly used for bacterial culture, yeast and fungal incubation, environmental microbiology, food and beverage testing, pharmaceutical quality control, and many other microbiological applications requiring precise temperature control.
Is this incubator appropriate for pharmaceutical and quality control laboratories?
Absolutely. Its combination of refrigerated operation, accurate microprocessor temperature control, forced-air circulation, and dependable temperature stability makes it an excellent choice for pharmaceutical quality assurance, stability testing, and routine laboratory quality control.
Why purchase a refurbished Fisher Isotemp 3724 Low Temperature Incubator from American Instrument Exchange?
A refurbished Fisher Isotemp 3724 Low Temperature Incubator from American Instrument Exchange provides laboratories with dependable refrigerated incubation at a substantial savings compared to purchasing new equipment. Featuring a 173-liter chamber, -10°C to 60°C operating range, forced-air convection, microprocessor temperature control, and excellent temperature stability, the Fisher Isotemp 3724 is an outstanding choice for environmental testing, water quality laboratories, microbiology, pharmaceutical quality assurance, and food safety applications. Every unit is thoroughly inspected and tested prior to shipment and includes a 90-day warranty for added confidence.
CLICK HERE to see the Fisher Isotemp model 3724 on our YouTube channel
Testing Procedures for Used and Refurbished Laboratory Incubators Ensure Quality and Stability Before Use
Used and refurbished laboratory incubators from American Instrument Exchange are thoroughly tested to ensure optimal performance and temperature stability with laboratory safety standards. Each unit undergoes a detailed inspection and functionality assessment to meet the needs of research, clinical, and industrial labs.
Why Testing Used Laboratory Incubators Is Essential
Before a laboratory incubator is reintroduced into any work environment, it must be tested for:
• Temperature uniformity and accuracy
• Airflow and humidity control (if applicable)
• Door seal integrity and insulation effectiveness
• Electrical and safety system compliance
Comprehensive testing reduces the risk of culture loss, contamination, and equipment failure—especially critical in applications involving cell culture, microbiology, pharmaceutical research, and diagnostics.
Our multi-point testing protocol for used and refurbished incubators ensures reliability, safety, and performance across all models and brands.
Key Testing Procedures for Refurbished and Used Laboratory Incubators
1. Initial Visual Inspection
• Check for cosmetic damage, corrosion, and wear to exterior surfaces, door hinges, and gasket seals
• Inspect power cord, wiring, and display panel for any defects or signs of tampering
• Confirm that shelves, chamber components, and internal fixtures are present and undamaged
2. Functional Testing
• Power on the incubator and verify all display indicators and alarms function correctly
• Test door latch and seal mechanisms for proper closure and insulation
• Run basic temperature cycles to ensure the unit maintains stability over time
3. Temperature Accuracy and Uniformity Tests
• Test internal sensors and controllers using temperature probes
• Measure temperature consistency at multiple chamber locations over several hours
• Confirm that programmable temperature settings respond accurately
4. Airflow and Humidity Control (if applicable)
• Test internal fan operation and airflow distribution
• For humidified incubators, inspect and test humidity reservoirs, sensors, and control systems
• Check for condensation buildup and confirm environmental stability
5. Electrical Safety and Compliance Checks
• Ensure all electrical components are properly grounded
• Perform insulation resistance and leakage current tests
• Verify compliance with current electrical safety standards for laboratory equipment
6. Final Quality Assurance Checklist
• Perform full cycle testing at various temperature setpoints
• Document performance benchmarks and results
All refurbished incubators from American Instrument Exchange are backed by our commitment to quality and precision. With our strict testing procedures, you can rely on your incubator to deliver dependable results from day one.
Repair and Refurbishment Protocol for Used Laboratory Incubators Performance and Quality from American Instrument Exchange
At American Instrument Exchange, every used laboratory incubator we sell goes through a repair and refurbishment protocol. Whether it’s a standard, CO₂, or refrigerated incubator, our goal is to restore each unit to laboratory-level performance—ensuring temperature accuracy, environmental stability, and long-term reliability in your lab.
Why Choose a Refurbished Laboratory Incubator from American Instrument Exchange?
• Fully tested for performance and safety
• Backed by a warranty
• Cost-effective alternative to new equipment
• Environmentally sustainable through reuse and restoration
• Refurbished by expert technicians with decades of lab equipment experience
Step-by-Step Refurbishment Protocol
Every incubator at American Instrument Exchange follows this comprehensive, multi-stage process:
1. Initial Intake & Inspection
• Visual inspection for cosmetic wear, corrosion, dents, or broken components
• Mechanical assessment of door hinges, gaskets, seals, and chamber components
• Document any missing parts or issues requiring repair or replacement
2. Cleaning and Decontamination
• Thorough internal and external cleaning using non-abrasive solutions
• Decontamination/cleaning of surfaces to remove biological, chemical, or particulate residue
• Cleaning of removable parts (e.g., shelves, trays, etc.)
3. Mechanical and Electrical Repair
• Repair or replacement of worn mechanical components such as door latches, fans, hinges, and seals
• Evaluation and repair of control panels, switches, thermostats, and displays
• Inspection and testing of wiring, fuses, relays, and power supplies
4. Environmental Control System Assessment
• For CO₂ incubators: CO₂ sensors, regulators, and gas delivery systems are tested
• For refrigerated incubators: compressors, condensers, and cooling systems are evaluated for performance and leaks
• Fan motors and airflow systems are tested to ensure uniform environmental conditions
5. Temperature and Sensor Testing
• All temperature sensors and controllers are tested using thermometers/probes
• Uniformity and accuracy tested at multiple chamber locations
• For humidified or CO₂ incubators, humidity and CO₂ stability are verified
6. Safety System Testing
• Test of over-temperature protection systems and alarms
• Evaluation of door sensors, safety interlocks, and power failure recovery
7. Final Quality Control and Documentation
• Full performance test run over 24 hours
• Validation of setpoints for temperature, CO₂ (if applicable), and humidity (if applicable)
• Final inspection and cleaning before packaging
• Complete service report
Trust the Experts at American Instrument Exchange
With over 50 years in the lab equipment industry, American Instrument Exchange is a trusted source for high-quality refurbished laboratory incubators. Our proven refurbishment protocol ensures every unit is reliable, accurate, and ready to meet the demands of your lab from day one.
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.
