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Thermoelectric Liquid Chiller![]()
LK220 Thermoelectric 1/4" Outer Diameter Polyurethane Tubing (Included) Valved CPC® Quick-Disconnect Fittings (Included) ![]() Please Wait
Features
Thorlabs’ LK220 Thermoelectric Liquid Chiller is an air-cooled liquid chiller that provides up to 200 Watts of cooling, 1.2 bar (17.4 psi) of pumping capability, and ±0.1 °C temperature stability, making it an ideal benchtop solution for heat dissipation. Based on thermoelectric cooler elements (TECs), this chiller can operate at low noise levels while also achieving high temperature accuracies of 0.01 °C. For more information about the cooling capacity and flow performance, please see the Graphs tab. A removable dust filter is installed behind the chiller's font panel to support use in industrial environments. To reach the specified 200 W cooling power of the unit (see Key Specifications table), the dust filter must be removed. This can be done by unscrewing the four M3 cap screws with a 2 mm (5/64") ball driver or hex key. Please note that we only recommend long-term use of the LK220 without the dust filter in standard photonics lab environments and cleanrooms. ![]() Click to Enlarge CPC Thumb Latch Quick-Disconnect Fittings Allow for One-Handed Operation Quick Connections and Tubing ![]() Click to Enlarge The coolant reservoir is easily accessible by opening the hinged lid and removing the plastic cap. Coolant Reservoir Thorlabs’ thermoelectric liquid chiller is compatible with most ethylene glycol-based coolants, but we recommend using our CDTX Coolflow DTX refrigerant antifreeze with corrosion inhibitors (not included) for best performance. Please note that water can be used as coolant, but will result in reduced performance, and alcohol-based coolants cannot be used with this chiller. For more information on how various coolants affect the LK220 chiller's cooling capabilities, see the Graphs tab. Operation A monitor out port (BNC) is included on the front panel to indicate the actual temperature measured by the chiller, and it outputs a 0 to 5 V range that corresponds to -5 to 45 °C. To measure the outlet coolant temperature, the LK220 liquid chiller is equipped with an internal thermistor sensor inside the return coolant hose. An external thermistor, such as the Thorlabs TSP-TH temperature probe, can be connected to the chiller using the 2.5 mm stereo jack and used to provide temperature readings for the control feedback loop. Alternatively, a third party thermistor with 10 kΩ resistance at 25 °C can be used if the beta constant is set using the software. †CPC® is a registered trademark of Colder Products Company.
Performance GraphsThis data reflects the typical performance of Thorlabs' LK220 thermoelectric liquid chiller, and is presented for reference only. The guaranteed specifications are shown in the Specs tab, however, performance may vary from unit to unit. ![]() Click to Enlarge Click for Raw Data Cooling capacity indicates the maximum heat load that the LK220 chiller can dissipate. Please note that ΔT is the temperature difference between the coolant and the ambient temperature, which was 25 °C for the dust filter off and 20 °C for the dust filter on. Measurements were taken at 60% pumping power with CDTX Coolflow DTX refrigerant antifreeze. ![]() Click to Enlarge Click for Raw Data Flow performance demonstrates the pumping capability of the LK220 chiller running at 50%, 80% and 100% pump power, and process flow is measured in Litres per Minute (LPM). Measurements are taken at 25 °C ambient temperature with water used as coolant. Note that the kinematic viscosity of CDTX Coolflow DTX is approximately twice that of water and will result in less than half the flow performance. Thorlabs' LK220 thermoelectric liquid chiller can be used with most ethylene glycol-based antifreezes or coolants. The performance plots below show the LK220 cooling capacity when used with select coolants. Please note that using water for coolant will result in reduced performance and that alcohol-based coolants cannot be used with this chiller. ![]() Click to Enlarge Click for Raw Data Cooling capacity of the LK220 liquid chiller with the dust filter installed for various coolants and the pump running at 60%. Please note that ΔT is the temperature difference between the coolant and the ambient temperature. The ambient temperature is 20 °C for each measurement. ![]() Click to Enlarge Click for Raw Data Cooling capacity of the LK220 liquid chiller with the dust filter removed for various coolants and the pump running at 60%. Please note that ΔT is the temperature difference between the coolant and the ambient temperature. The ambient temperature is 25 °C for the CDTX Coolflow DTX measurement and 20 °C for the other coolants. ![]() Click to Enlarge Front Panel ![]() Click to Enlarge Back Panel
The LK220 liquid chiller contains the following components:
![]() Click to Enlarge Software GUI for the LK220 Thermoelectric Liquid Chiller SoftwareVersion 1.0.3 Includes a GUI for control of Thorlabs' Thermoelectric Liquid Chiller (LK220), as well as the required device drivers and LabVIEW/C++/Python SDK for secondary development. To download, click the button below. Thermoelectric Liquid Chiller Software PackageGUI Interface
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