Laboratory circulators and chillers precisely control the temperature of deionized water, bath fluid, or PH-neutral buffer for delivery to integrated or external water baths, analytical instruments, incubators, and wet processing stations.
Lab circulators, common in life science research, drug discovery, material testing, wafer production, and wet chemistry, are used to cool or chill samples, thaw reagents or cell media, and supply temperature-controlled water to external equipment.
Lab circulators and chillers include a fluid reservoir connected to a cooling or heating system regulated by a digital or analog controller. The integral reservoir, or water bath, may be open for easy access or enclosed by a gable cover to prevent heat loss. Certain circulators include a pump to deliver water to external equipment, such as refractometers, photometers, or viscometers.
Immersion circulators are handheld systems designed to clamp onto water baths to regulate bath temperature.
Immersion circulators include a cooling or heating coil, integral pump, and digital or analog controller to regulate temperature and flow rate.
Immersion circulators are economical alternatives to lab circulators or chillers, but do not include integral water baths and provide limited flow rates and cooling/heating capabilities.
Laboratory circulators and chillers include heating systems to precisely control the temperature of the water, buffer, or bath fluid.
Lab circulators commonly heat fluid to 150°C.
Julabo’s PRESTO circulators can achieve temperature set points up to 250°C. Common applications for heating circulators include food stability testing, medical device quality analysis, and forced aging studies.
Applications for lab chillers include cell freezing, blood banking, and pour point determination of petroleum products.
Laboratory chillers, or refrigerated circulators, include cooling coils to chill bath fluid or lab-grade water. Lab chillers commonly cool fluid down to -20°C.
Julabo’s PRESTO circulators can maintain temperatures down to -80°C.
Lab circulator capacity refers to the volume of liquid safely stored and processed by the system.
Julabo’s Cryo-Compact chillers are low-throughput benchtop chiller systems that accommodate fluid volumes under 10 liters.
Julabo’s FL Series circulators are high-throughput, free-standing systems that accommodate fluid volumes up to 50 liters.
120-volt connections are suitable for standard laboratory power outlets in the United States, Canada, Mexico, and South America.
208-volt or 240-volt connections, common in Mainland Europe and throughout Asia, require less current (amperage) and smaller conductors than equipment designed to operate at 120-volt.
Immersion circulators, like Julabo’s CORIO C Series, are placed within external water baths to mix and precisely control the temperature of the bath fluid. Immersion circulators are more cost-effective than benchtop circulators and more flexible: one immersion circulator can control multiple water baths within a single lab, given the baths aren’t operated simultaneously. However, immersion circulators cannot achieve the flow rates and temperature ranges of a benchtop circulator.
Open bath circulators, like Julabo’s CORIO CD Series, include an integral, exposed water bath regulated by a digital controller. Open bath circulators provide easier sample access than enclosed bath circulators but may be prone to heat loss or larger temperature fluctuations. Common applications include temperature control of measurement cells, heating glassware, and material testing.
Recirculating chillers contain enclosed water baths, cooling and/or heating coils, and digital control systems. Recirculating chillers include pump systems to deliver fluid to external equipment, such as wet processing stations, water-jacketed incubators, photometers, and refractometers. More expensive than immersion or open bath circulators, recirculating chillers provide large bath capacities, higher flow rates, broader temperature ranges and tighter set point tolerances.
Transparent polycarbonate baths are more cost-effective and provide better sample visualization than stainless steel baths. However, polycarbonate baths support limited temperature ranges, typically between -20°C and 100°C.
Stainless steel baths help maintain aseptic conditions, resist acids and solvents, and support broader temperature ranges than polycarbonate baths.
Lab circulator power, listed in Watts (W), corresponds to the heat load capacity of the system.
Heat energy removed or applied to the fluid drives the maintainable temperature range of the system. Common lab circulators feature heat loads between 250 and 2,000 Watts.
Julabo’s PRESTO circulators include heat loads up to 2,700 Watts and, thus, industry-leading temperature ranges (-80°C - 250°C).
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