The PolyScience AD07R-20-A12E Refrigerated/Heated Circulator is a precision 7 L laboratory circulating bath designed for demanding temperature-control applications from -20°C to +200°C. Equipped with PolyScience's Advanced Digital controller, the AD07R-20 provides temperature stability of approximately ±0.01°C while combining refrigeration, high-capacity heating, internal bath circulation, and external temperature-control capability in a compact benchtop system.
Available used and refurbished from American Instrument Exchange, this PolyScience refrigerated circulator provides a versatile temperature-control platform for sample conditioning, analytical instrumentation, jacketed vessels, reaction studies, viscosity measurements, calibration work, and other temperature-sensitive laboratory applications. This A12E configuration operates on 208–240 V, 50 Hz electrical service. A 90-day warranty is included.
Key Features
-20°C to +200°C operating temperature range
7 L reservoir capacity
Approximately ±0.01°C temperature stability
200 W refrigeration capacity
2200 W heating capacity
Advanced Digital temperature controller
Large digital controller display
Swivel 180 rotating controller for improved viewing
Internal and external circulation capability
External temperature-control capability
Automatic performance optimization
Specific heat tuning
Single-point calibration capability
Multiple communication interfaces
High- and low-temperature safety limits
208–240 V, 50 Hz configuration
Used, refurbished, and tested by American Instrument Exchange
90-day warranty included
Overview
The PolyScience AD07R-20-A12E combines refrigeration, heating, fluid circulation, and advanced digital temperature control in a relatively compact 7 L circulating bath. Its broad -20°C to +200°C operating range allows one system to perform both below-ambient cooling and substantially elevated-temperature heating.
The integrated reservoir can be used directly for temperature conditioning of samples, vessels, and other compatible materials. The circulation system can also deliver conditioned heat-transfer fluid to compatible external equipment, extending the AD07R-20 beyond conventional water-bath applications.
PolyScience's Advanced Digital controller provides precise electronic temperature regulation with a user-friendly digital interface. The controller can also work with an external temperature probe, allowing temperature regulation to be based on conditions within a compatible external application rather than solely on fluid temperature inside the bath.
A swivel-mounted controller can be rotated to improve viewing and access from different working positions, a useful feature when the circulator is installed alongside other laboratory equipment.
Key Specifications
Specification
Details
Manufacturer
PolyScience
Model
AD07R-20-A12E
Controller Type
Advanced Digital
Equipment Type
Refrigerated/heated circulating bath
Reservoir Capacity
7 L
Temperature Range
-20°C to +200°C
Temperature Stability
±0.01°C
Cooling Capacity
200 W
Heating Capacity
2200 W
Display
Advanced Digital display
Controller Position
Swivel 180 rotating controller
External Temperature Control
Yes
Circulation
Internal and external
Working Access
Approx. 6.18 in. L × 5.59 in. W × 5 in. D
Exterior Dimensions
Approx. 8.7 in. W × 21.3 in. D × 24.3 in. H
Communications
USB-A, USB-B, Ethernet, RS-232 / RS-485
Electrical Requirements
208–240 V, 50 Hz
Warranty
90 days
Common Applications
The PolyScience AD07R-20 is suitable for laboratory applications requiring accurate and repeatable temperature control across a broad operating range. Typical uses include sample conditioning, chemical reaction control, analytical instrument temperature regulation, viscosity measurements, calibration procedures, materials testing, reagent conditioning, and general research applications.
Samples and compatible vessels can be placed directly into the 7 L reservoir for controlled heating or cooling. Active fluid circulation promotes consistent temperature conditions throughout the working area.
The AD07R-20 can also circulate conditioned fluid through compatible external equipment. Potential applications include jacketed reaction vessels, condensers, analytical instruments, heat exchangers, small process systems, and other equipment requiring an external source of controlled-temperature fluid.
Its -20°C to +200°C range makes the system particularly useful for laboratories that perform both refrigerated and elevated-temperature procedures and would prefer a single temperature-control platform.
Ideal Laboratory Types
The PolyScience AD07R-20-A12E is well suited for pharmaceutical and biotechnology laboratories, chemistry facilities, analytical laboratories, quality-control departments, materials-science groups, industrial R&D laboratories, academic research facilities, and other environments requiring precision temperature control.
Its relatively compact 7 L reservoir is particularly appropriate for dedicated experimental setups, small-volume sample conditioning, and external instrument temperature control.
Laboratories requiring accurate temperature regulation may also benefit from the approximately ±0.01°C stability provided by the Advanced Digital control system.
Temperature Control & Stability
The PolyScience AD07R-20 provides temperature control from -20°C to +200°C with stability of approximately ±0.01°C under appropriate operating conditions.
This broad range allows active refrigeration below normal laboratory ambient temperatures as well as heating to temperatures far beyond those possible with a conventional laboratory water bath.
The system provides approximately 200 W of refrigeration capacity and 2200 W of heating capacity. Available refrigeration performance depends on the operating temperature and thermal load, so applications generating continuous heat should be evaluated according to the required coolant temperature and actual heat-removal demand.
The Advanced Digital controller incorporates automatic performance optimization and specific heat tuning to help the circulator respond appropriately to different fluids and operating conditions.
Heat-transfer fluid selection is critical across such a broad temperature range. Water is appropriate for only a portion of the AD07R-20's operating envelope. Applications approaching either temperature extreme require a compatible heat-transfer fluid selected for the intended setpoint and procedure.
Circulation & Pump Performance
The AD07R-20 provides active internal circulation to promote consistent temperature distribution throughout the 7 L reservoir.
It can also circulate temperature-controlled fluid through compatible external equipment, allowing the system to function as an external heating and cooling source rather than solely as an immersion bath.
An important capability of the Advanced Digital controller is support for an external temperature probe. In compatible external applications, this allows the controller to regulate conditions according to the temperature at the external process rather than relying exclusively on the internal bath temperature.
Actual circulation performance through external equipment depends on tubing diameter and length, fittings, heat-transfer-fluid viscosity, operating temperature, elevation differences, and hydraulic resistance within the connected apparatus.
For applications requiring a specific flow rate or pump pressure, American Instrument Exchange can help verify the performance of the individual unit before shipment.
Refurbishment & Testing
This used PolyScience AD07R-20-A12E Refrigerated/Heated Circulator is refurbished and tested by American Instrument Exchange before shipment. Our technicians inspect the refrigeration system, heater, circulation pump, Advanced Digital controller, display, reservoir, safety systems, electrical components, and fluid connections.
Temperature-controlled equipment is tested using NIST-traceable probes and data loggers. Because the AD07R-20 provides both heating and refrigeration, the system is operated for extended periods at lower and higher temperatures to evaluate cooling, heating, circulation, temperature regulation, and controller operation.
The reservoir and accessible fluid-contact components are cleaned and inspected prior to shipment.
If your application requires operation at a particular temperature or has specific testing requirements, contact American Instrument Exchange before shipment. When practical, our technicians can incorporate customer-requested operating conditions into final testing.
A 90-day warranty is included with this refurbished PolyScience circulator.
Choosing the Right Refrigerated/Heated Circulator
The PolyScience AD07R-20 is particularly well suited for laboratories that need precise temperature control across a wide operating range but do not require a large reservoir.
Its 7 L capacity keeps the system relatively compact, while the -20°C to +200°C temperature range allows one circulator to perform applications that might otherwise require separate refrigerated and high-temperature baths.
Temperature stability is another important consideration. With approximately ±0.01°C stability, the Advanced Digital controller is appropriate for applications where repeatable temperature conditions are important.
Cooling capacity should also be matched to the application. The approximately 200 W refrigeration capacity is appropriate for relatively modest thermal loads. Equipment generating substantially greater continuous heat may require a larger refrigerated circulator or dedicated recirculating chiller.
Finally, buyers should verify electrical compatibility. This AD07R-20-A12E is a 208–240 V, 50 Hz configuration and should be matched to appropriate laboratory electrical service before purchase.
American Instrument Exchange can help compare available used and refurbished PolyScience circulators based on reservoir size, temperature range, stability, cooling capacity, pump requirements, and electrical configuration.
Related Equipment
American Instrument Exchange stocks a variety of laboratory circulators, including refrigerated/heated circulating baths, recirculating chillers, immersion circulators, and process temperature-control systems. Laboratories considering the PolyScience AD07R-20 may also want to compare available laboratory water baths, reactors and fermenters, evaporators and extractors, and other refurbished laboratory equipment.
What is the temperature range of the PolyScience AD07R-20?
The PolyScience AD07R-20 operates from approximately -20°C to +200°C, providing both refrigerated and high-temperature operation from a single circulating bath.
What is the capacity of the AD07R-20?
The AD07R-20 has a 7 L reservoir with a working access area of approximately 6.18 × 5.59 × 5 inches.
How stable is the temperature?
PolyScience specifies temperature stability of approximately ±0.01°C for the Advanced Digital AD07R-20.
Is the AD07R-20 an Advanced Digital or Advanced Programmable circulator?
The AD prefix identifies this model as an Advanced Digital circulator. PolyScience uses the AP designation for its Advanced Programmable controller models.
Can the AD07R-20 control the temperature of external equipment?
Yes. The system supports external fluid circulation and external temperature sensing, making it suitable for compatible jacketed vessels, analytical instruments, and other externally connected applications.
How much heating and cooling capacity does the AD07R-20 provide?
This configuration provides approximately 200 W of cooling capacity and 2200 W of heating capacity. Actual refrigeration performance depends on the operating temperature and thermal load.
What does A12E mean in the model number?
The A12E suffix identifies this PolyScience configuration as a 208–240 V, 50 Hz version. Buyers should confirm that appropriate electrical service is available before installation.
Does this refurbished PolyScience AD07R-20-A12E include a warranty?
Yes. This used PolyScience AD07R-20-A12E is refurbished and tested by American Instrument Exchange and includes a 90-day warranty.
CLICK HERE to see the PolyScience AD07R-20-A12E 7L, Advanced Digital-Controlled, Refrigerated/Heated Circulator 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.
