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JULABO FL601 Recirculating Chiller
The JULABO FL601 Recirculating Chiller is a compact laboratory cooling system designed to provide reliable, temperature-controlled fluid circulation for analytical instruments, condensers, laboratory equipment, and process applications. With a -20°C to +40°C working temperature range, ±0.5°C temperature stability, and a centrifugal pressure pump capable of circulating up to 23 L/min, the FL601 provides a versatile closed-loop cooling solution for routine laboratory and industrial applications.
Available used and refurbished from American Instrument Exchange, the JULABO FL601 combines refrigeration, PID temperature control, a stainless steel reservoir, external circulation, and digital monitoring in a compact floor or under-bench configuration. The system can provide an economical alternative to once-through tap-water cooling while offering greater control over coolant temperature and operating conditions. A 90-day warranty is included.
Key Features
-20°C to +40°C working temperature range
±0.5°C temperature stability
Maximum circulation flow rate of 23 L/min
Maximum pump pressure of 14.5 psi
5.5–8 L bath filling volume
PID temperature control
Cooling capacity up to 0.6 kW at 20°C
Stainless steel internal reservoir
RS232 interface for connection to a computer or control system
Optical and audible low-liquid-level alarm
Compact design suitable for installation on or underneath a laboratory bench
Used, refurbished, and tested by American Instrument Exchange
90-day warranty included
Overview
The JULABO FL601 is a refrigerated recirculating chiller designed primarily to remove heat from externally connected laboratory equipment. The unit continuously cools and circulates a controlled volume of heat-transfer fluid through a closed loop, allowing laboratories to provide dedicated cooling without continuously consuming facility water.
Microprocessor-based PID temperature control maintains the selected coolant temperature, while a centrifugal pressure pump circulates fluid to the external application. The FL601 also incorporates a stainless steel internal tank, visible fluid-level indicator, low-level protection, accessible filling and draining, and a bright LED temperature display.
An RS232 interface allows the chiller to communicate with a computer or higher-level control system. An alarm output provides additional integration options for applications where operating status needs to be monitored externally.
The FL601 is now an older-generation JULABO model, but its combination of useful cooling capacity, compact size, and straightforward controls continues to make it a practical option for many laboratory cooling applications.
Key Specifications
Specification
Details
Manufacturer
JULABO
Model
FL601
Equipment Type
Recirculating cooler / laboratory chiller
Working Temperature Range
-20°C to +40°C
Temperature Stability
±0.5°C
Temperature Resolution
0.1°C
Temperature Control
Microprocessor PID
Temperature Sensor
Pt100
Maximum Pump Flow
23 L/min
Maximum Pump Pressure
14.5 psi
Pump Type
Centrifugal pressure pump
Bath Fill Volume
5.5–8 L
Cooling Capacity at +20°C
0.60 kW
Cooling Capacity at +10°C
0.50 kW
Cooling Capacity at 0°C
0.40 kW
Cooling Capacity at -10°C
Approx. 0.32–0.33 kW
Cooling Capacity at -20°C
0.10–0.20 kW, depending on configuration/refrigerant generation
Pump Connections
M16 × 1 male
Display
LED
Communications
RS232
Exterior Dimensions
12.6 in. W × 19.7 in. D × 23.6 in. H
Electrical Requirements
115 V, 60 Hz
Weight
106 lb
Warranty
90 days
Common Applications
The JULABO FL601 is suitable for routine laboratory applications requiring continuous removal of heat from externally connected equipment. Typical uses include rotary evaporator condensers, analytical instrumentation, reaction vessels, distillation equipment, vacuum systems, condensers, and other laboratory apparatus requiring a dedicated coolant supply.
The FL601 can also provide an alternative to once-through tap-water cooling in compatible applications. Rather than continuously using fresh water and sending it to drain, the chiller recirculates and refrigerates the same heat-transfer fluid.
Its combination of moderate cooling capacity and 23 L/min circulation makes the FL601 particularly useful for individual laboratory instruments and processes that do not require the capacity or footprint of a larger industrial chiller.
Ideal Laboratory Types
The JULABO FL601 is well suited for chemistry laboratories, pharmaceutical and biotechnology facilities, analytical laboratories, materials-science groups, industrial R&D facilities, quality-control laboratories, academic research departments, and other facilities requiring reliable equipment cooling.
Its compact configuration is particularly useful for laboratories where floor or bench space is limited. The absence of side ventilation also allows more flexibility when positioning the unit alongside other laboratory equipment.
Temperature Control & Stability
The JULABO FL601 provides a working temperature range of -20°C to +40°C with specified temperature stability of ±0.5°C. A microprocessor-based PID controller regulates refrigeration performance while a Pt100 temperature sensor monitors circulating-fluid temperature.
Cooling capacity varies substantially with operating temperature. The FL601 provides approximately 0.6 kW of refrigeration capacity at +20°C, 0.5 kW at +10°C, and 0.4 kW at 0°C. Available cooling capacity decreases further as the coolant approaches the bottom of the operating range.
This relationship is important when selecting a recirculating chiller. Laboratories should compare the thermal load generated by their equipment with the FL601's available cooling capacity at the intended operating temperature rather than selecting the chiller solely because it can reach -20°C.
Circulation & Pump Performance
The FL601 uses a centrifugal pressure pump capable of providing a maximum flow rate of approximately 23 L/min and maximum pressure of approximately 14.5 psi.
This combination provides substantial circulation for a compact laboratory chiller and allows the FL601 to supply coolant to a variety of compatible external instruments and processes.
Actual coolant flow through connected equipment will depend on tubing diameter and length, fittings, fluid viscosity, operating temperature, elevation differences, and resistance within the external system. Laboratories should verify both required flow and allowable pressure before connecting equipment to the chiller.
The FL601 uses M16 × 1 male pump connections and can accommodate appropriate tubing through compatible fittings.
Refurbishment & Testing
This used JULABO FL601 Recirculating Chiller is refurbished and tested by American Instrument Exchange before shipment. Our technicians inspect the refrigeration system, circulation pump, reservoir, temperature controller, display, alarms, electrical components, and fluid connections and operate the unit to confirm proper functionality.
Temperature-controlled equipment is tested using NIST-traceable probes and data loggers. The refrigeration system is operated to verify cooling and temperature regulation, while pump operation and fluid circulation are evaluated as part of the testing process. The stainless steel reservoir and fluid-contact areas are cleaned and inspected prior to shipment.
If your application requires a particular coolant 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 JULABO recirculating chiller.
Choosing the Right Recirculating Chiller
When selecting a recirculating chiller, buyers should consider the target coolant temperature, heat generated by the connected equipment, available cooling capacity at that temperature, pump flow, pump pressure, reservoir volume, and electrical requirements.
The JULABO FL601 is particularly appropriate for moderate laboratory cooling loads requiring coolant temperatures between -20°C and +40°C. Its 23 L/min circulation capacity provides useful flow for a relatively compact chiller, while the 5.5–8 L reservoir keeps overall fluid volume manageable.
Applications requiring significantly greater cooling capacity, extremely tight temperature stability, or high-pressure circulation through highly restrictive fluid paths may require a different chiller configuration.
American Instrument Exchange can help compare available used and refurbished laboratory circulators based on your required coolant temperature, thermal load, circulation requirements, and application.
What is the temperature range of the JULABO FL601?
The JULABO FL601 has a working temperature range of -20°C to +40°C, making it suitable for both below-ambient and near-ambient laboratory cooling applications.
What is the maximum flow rate of the JULABO FL601?
The centrifugal pressure pump provides a maximum flow rate of approximately 23 L/min with maximum pressure of approximately 14.5 psi. Actual flow through connected equipment depends on the resistance of the complete circulation loop.
How much cooling capacity does the FL601 provide?
Cooling capacity varies with operating temperature. The FL601 provides approximately 0.6 kW at +20°C, 0.5 kW at +10°C, and 0.4 kW at 0°C, with available cooling capacity decreasing further at subzero temperatures.
Can the JULABO FL601 be used with a rotary evaporator?
Yes. Recirculating chillers such as the FL601 can provide controlled coolant to compatible rotary evaporator condensers. The evaporator's thermal load and required coolant temperature should be compared with the FL601's cooling performance before use.
Can the FL601 replace tap-water cooling?
In many compatible applications, yes. The FL601 can continuously refrigerate and recirculate heat-transfer fluid through laboratory equipment rather than continuously consuming facility water and sending it to drain.
Does the JULABO FL601 support computer control?
Yes. The FL601 includes an RS232 interface for connection to a computer or higher-level control system, as well as an alarm output for external monitoring.
What fluids can be used in the JULABO FL601?
Compatible fluids depend on the required operating temperature. JULABO specifies appropriate water, water/glycol mixtures, and compatible silicone-based heat-transfer fluids for FL-series applications. Fluid selection should always be matched to the intended operating temperature and equipment requirements.
Does this refurbished JULABO FL601 include a warranty?
Yes. This used JULABO FL601 is refurbished and tested by American Instrument Exchange and includes a 90-day warranty.
CLICK HEREto see the Julabo FL601 Recirculating Chiller 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.
