PolyScience Model 625 Recirculating Chiller

PolyScience 625 chiller

Brand : Polyscience

Product Code : SKU 1495A CIRC

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PolyScience 625 Recirculating Chiller

The PolyScience 625 Recirculating Chiller is a compact refrigerated laboratory cooling system designed to provide continuous, closed-loop cooling for analytical instruments, research equipment, condensers, and other heat-generating laboratory devices. With approximately 575 W of cooling capacity, an integrated refrigeration system, coolant reservoir, and circulation pump, the Model 625 provides a reusable alternative to once-through tap-water cooling for compatible laboratory applications.

Part of PolyScience's established family of refrigerated recirculators, the Model 625 is designed to continuously remove heat from external equipment while returning temperature-controlled coolant through a closed fluid loop. Its relatively compact cooling capacity makes it particularly appropriate for individual instruments and moderate laboratory heat loads rather than large process-cooling applications.

Available used and refurbished from American Instrument Exchange, this PolyScience 625 is inspected and tested for reliable refrigeration, circulation, and temperature-control performance. A 90-day warranty is included.

Key Features

Approximately 575 W cooling capacity
Refrigerated recirculating chiller
Closed-loop external equipment cooling
Integrated mechanical refrigeration
Active coolant circulation
Integrated coolant reservoir
Designed for continuous heat removal
Suitable for analytical and laboratory equipment
Can replace tap-water cooling in compatible applications
Reuses coolant through a closed circulation loop
Compact laboratory cooling system
Straightforward legacy PolyScience controls
Part of the PolyScience 625/633/675/6100 refrigerated recirculator family
Used, refurbished, and tested by American Instrument Exchange
90-day warranty included

Overview

The PolyScience Model 625 is a dedicated recirculating chiller designed to remove heat from compatible external laboratory equipment.

Unlike a refrigerated circulating bath, which typically provides an accessible reservoir for direct immersion of samples, the Model 625 is principally designed to function as a closed-loop cooling source.

Coolant is pumped from the chiller through the connected instrument or process. As the fluid passes through that equipment, it absorbs heat. The warmed coolant then returns to the Model 625, where the refrigeration system removes the accumulated heat before the fluid is circulated through the external equipment again.

This arrangement provides a reusable source of cooling and can eliminate the need to continuously consume and discharge laboratory tap water.

With approximately 575 W of refrigeration capacity, the PolyScience 625 is particularly appropriate for moderate heat loads such as individual analytical instruments, condensers, laboratory apparatus, and other equipment that does not require the substantially greater capacity of a large process chiller.

Key Specifications

Specification	Details
Manufacturer	PolyScience
Model	625
Equipment Type	Refrigerated recirculating chiller
Cooling Capacity	Approx. 575 W
Cooling Method	Mechanical refrigeration
Application	Closed-loop external cooling
Circulation Pump	Integrated
Internal Reservoir	Yes
Temperature Control	Integrated
Refrigeration	Yes
Temperature Range	Verify individual unit / application
Pump Flow	Verify individual unit
Pump Pressure	Verify individual unit
Reservoir Capacity	Verify individual unit
Electrical Requirements	Verify individual unit nameplate
Warranty	90 days

Common Applications

The PolyScience 625 can support a variety of laboratory applications requiring continuous heat removal. Typical uses include cooling analytical instruments, condensers, rotary evaporators, vacuum equipment, laser systems, spectroscopy equipment, small reaction systems, distillation apparatus, heat exchangers, and other laboratory devices designed for external liquid cooling.

The Model 625 may be particularly useful for instruments that would otherwise be connected directly to a laboratory water supply.

Instead of continuously drawing fresh water and sending it to a drain, the chiller circulates the same coolant through a closed loop. The refrigeration system removes the heat collected from the equipment before returning the cooled fluid to the process.

This approach can reduce water consumption while providing more consistent cooling conditions than incoming tap water, which may vary in temperature seasonally or throughout the day.

Ideal Laboratory Types

The PolyScience 625 is well suited for chemistry laboratories, analytical laboratories, pharmaceutical research facilities, biotechnology companies, materials-science groups, quality-control departments, academic laboratories, and industrial R&D environments.

Its moderate cooling capacity can make it especially useful in laboratories that need a dedicated chiller for a single analytical instrument or relatively small experimental system.

The Model 625 can also be useful for facilities maintaining legacy analytical equipment originally installed with PolyScience recirculating chillers.

For larger instruments or processes producing substantially greater amounts of heat, a higher-capacity recirculating chiller may be more appropriate.

Cooling Performance & Heat Removal

The PolyScience 625 provides approximately 575 W of cooling capacity.

Cooling capacity is one of the most important specifications when selecting a recirculating chiller because the refrigeration system must be able to remove the heat continuously generated by the connected equipment.

A 575 W cooling load is equivalent to approximately 1,960 BTU/hr. This places the Model 625 in a useful range for moderate laboratory heat loads rather than large-scale process cooling.

Actual available cooling capacity can vary with coolant temperature and operating conditions. As with most mechanical refrigeration systems, cooling performance generally decreases as the required coolant temperature moves farther below ambient.

For this reason, buyers should evaluate both the amount of heat generated by the equipment and the required coolant temperature.

American Instrument Exchange can help evaluate the PolyScience 625 for a particular instrument or process when the required temperature and approximate heat load are known.

Circulation & External Cooling

The PolyScience 625 uses an integrated circulation system to continuously move coolant through compatible external equipment.

This closed-loop design allows the chiller to supply cooled fluid to an instrument, collect the warmed return fluid, remove the accumulated heat, and then send the cooled fluid back through the equipment.

Actual coolant flow through an external system depends on several factors beyond the circulation pump itself. Tubing diameter and length, fittings, elevation changes, coolant viscosity, operating temperature, and restrictions inside the connected instrument all affect delivered flow.

This is particularly important with analytical equipment containing small internal cooling passages. A chiller must provide not only adequate refrigeration capacity but also sufficient circulation pressure to maintain the required coolant flow through the instrument.

Customers with specific flow or pressure requirements are encouraged to provide those specifications before purchase so American Instrument Exchange can evaluate the individual chiller for the intended application.

Refurbishment & Testing

This used PolyScience 625 Recirculating Chiller is refurbished and tested by American Instrument Exchange before shipment. Our technicians inspect the refrigeration system, compressor, condenser, circulation pump, coolant reservoir, temperature controller, electrical components, fluid connections, housing, and associated safety systems.

Temperature-controlled equipment is tested using NIST-traceable probes and data loggers. The Model 625 is operated under simulated laboratory conditions to evaluate temperature pull-down, refrigeration performance, circulation, controller operation, and overall system performance.

The reservoir and accessible fluid-contact components are cleaned and inspected before shipment.

Customers requiring the chiller for a specific analytical instrument or experimental process are encouraged to provide the required coolant temperature, approximate heat load, minimum flow, pressure requirements, and intended coolant. When practical, American Instrument Exchange can incorporate customer-requested operating conditions into final testing.

A 90-day warranty is included with this refurbished PolyScience recirculating chiller.

Choosing the Right Recirculating Chiller

The PolyScience 625 is a good fit for applications requiring a compact dedicated cooling system with approximately 575 W of refrigeration capacity.

When replacing tap-water cooling, a recirculating chiller offers several advantages. Coolant is reused rather than continuously discharged, incoming fluid temperature can be controlled more consistently, and laboratory equipment becomes less dependent on variations in facility-water temperature and pressure.

Cooling capacity should be one of the first considerations when selecting a chiller. The connected equipment's continuous heat output should remain within the refrigeration capacity available at the desired coolant temperature.

Flow and pressure requirements are equally important. An analytical instrument with restrictive internal cooling passages may require relatively modest cooling capacity but substantial pump pressure.

Conversely, an open and unrestricted cooling circuit may require greater flow but relatively little pressure.

The PolyScience 625 is best considered a moderate-capacity laboratory chiller. Equipment producing significantly more than its approximately 575 W refrigeration capacity should be matched with a larger recirculating chiller.

American Instrument Exchange can help compare available PolyScience and other laboratory chillers based on temperature, cooling capacity, flow, pressure, electrical service, and the equipment being cooled.

Related Equipment

American Instrument Exchange stocks a range of laboratory circulators, including PolyScience recirculating chillers, refrigerated/heated circulators, immersion circulators, and high-capacity process cooling systems. Laboratories considering the PolyScience 625 may also want to compare available laboratory water baths, reactors and fermenters, evaporators and extractors, and other refurbished laboratory equipment.

PolyScience 625 Frequently Asked Questions

What is the PolyScience Model 625?

The PolyScience 625 is a refrigerated recirculating chiller designed to continuously remove heat from compatible external laboratory equipment through a closed coolant loop.

How much cooling capacity does the PolyScience 625 provide?

The Model 625 provides approximately 575 W of cooling capacity, equivalent to roughly 1,960 BTU/hr.

Is the PolyScience 625 a refrigerated water bath?

It is more accurately described as a recirculating chiller. Its primary purpose is supplying cooled fluid to compatible external equipment rather than providing an open working bath for direct sample immersion.

Can the PolyScience 625 replace tap-water cooling?

For compatible applications with heat loads within its cooling capacity, yes. A closed-loop chiller can eliminate or substantially reduce continuous consumption of laboratory tap water.

What equipment can be cooled with a PolyScience 625?

Potential applications include analytical instruments, condensers, rotary evaporators, lasers, vacuum equipment, small reaction systems, distillation equipment, heat exchangers, and other devices designed for external liquid cooling.

Is 575 W the same as the amount of electrical power the chiller consumes?

No. The 575 W figure describes refrigeration or heat-removal capacity. It should not be confused with the chiller's electrical power consumption.

How do I know whether 575 W is enough cooling capacity?

Determine the approximate continuous heat output of the connected equipment and the required coolant temperature. The chiller must provide sufficient refrigeration capacity at that operating temperature to remove the generated heat.

Does the PolyScience 625 have an integrated circulation pump?

Yes. The Model 625 is a refrigerated recirculator and uses an integrated pump to circulate coolant through compatible external equipment.

What flow and pressure does the PolyScience 625 provide?

Because reliable model-specific pump specifications have not been confirmed for this particular unit, customers with minimum flow or pressure requirements should contact American Instrument Exchange so the individual chiller can be evaluated.

Does this refurbished PolyScience 625 include a warranty?

Yes. This used PolyScience 625 is refurbished and tested by American Instrument Exchange and includes a 90-day warranty.

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.

Please contact our team at info@americaninstrument.com for more details.

FAQ

Does the equipment come with a warranty?

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.