THORLABS LK220 User Manual
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THORLABS LK220 User Manual

THORLABS LK220 User Manual

Thermoelectric liquid chiller
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LK220
Thermoelectric
Liquid Chiller
User Guide

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Summary of Contents for THORLABS LK220

  • Page 1 LK220 Thermoelectric Liquid Chiller User Guide...

  • Page 3: Table Of Contents

    Chapter 6  Maintenance ......................... 19  6.1.  Fuse Replacement ....................19  6.2.  Draining The Reservoir ................... 19  Chapter 7  Specifications ...................... 20  Chapter 8  Mechanical Drawings  .................... 22  Chapter 9  Certification and Compliance  .................. 23  Chapter 10  Regulatory ........................ 25  Chapter 11  Thorlabs Worldwide Contacts  ................... 26 ...

  • Page 4: Chapter 1 Safety

    Liquid Chiller Chapter 1 Safety The device comes with a switching power supply compatible with voltages from 100 to 240 VAC. There is no need to change the fuse when selecting your regional voltage. If the user needs to change the fuse located below the AC plug on the back of the unit, see section 6.1.

  • Page 5: Chapter 2 Overview

    The LK220 is an air-cooled, recirculating liquid chiller based on thermoelectric elements (TECs) that provides up to 1.2 bar of pumping capability. The bi-polar operation of the TECs allows the LK220 to be used for cooling or heating applications. This liquid chiller has a maximum heat pump capability of 200 W when set to the ambient temperature and a temperature control stability of ±0.1 °C.

  • Page 6: Chapter 3 Getting Started

    Liquid Chiller Chapter 3 Getting Started 3.1. Shipping List The package contains the following items:  1 Chiller  1 Power Cord  1 USB Cable  5 Meters of 4.3 mm (0.17”) Inner Diameter Hose  1 Siphon Pump ...

  • Page 7: Front & Back Panels

    Liquid Chiller 3.2. Front & Back Panels Figure 1 Front and Back Panels of LK220  F1. Secondary Power Switch  F2. SMA Port for Analog IN: 0 V to 5 V  F3. 2.5 mm Stereo Jack for External Thermistor ...

  • Page 8: Chapter 4 Operation

    Connect the other side of the hoses to the thermal load. Figure 2 Ferruleless Compression Fitting for Easy Connection with Tubing Figure 3 Connecting Hoses to the LK220 Rev A, December 6, 2019 Page 5...
  • Page 9 Figure 5 Set Target to Room Temperature and Run LK220 Once the hoses, heat load, and the reservoir are filled, put the cap back on the reservoir, close the hatch, and start regular operation.

  • Page 10: Front Panel Operation

    Press the knob to confirm the temperature value. Select the Run/Stop option to enable the device. Figure 6 Quick Operation to Run LK220 by Panel Control 4.2.2. SetTemp Select the SetTemp button to enter the set temperature screen; the target temperature and temperature window can be set here.

  • Page 11: Menu

    If this control sensor is selected while no sensor is connected, a error message will appear and a alarm will be set off. The LK220 chiller will be disabled until a TSP-TH is connected or the control sensor is switched back to INT.

  • Page 12: Status Display

    High ActTemp: When the Unit is Running, the Actual Temperature is Higher than the Target and Outside the Temperature Window 4.3. There are six I/O ports on the front panel of LK220.  Analog In: SMA Port, provides control of the target temperature from a external signal, 0 V to +5 V DC Input Corresponds to -5 °C to 45 °C Target temperature;...

  • Page 13: Led Indicator

    Connecting an External Sensor On the front panel of the LK220, there is a 2.5 mm Stereo Jack (F2 in Figure 1). It is designed to accept a Thorlabs TSP-TH thermistor temperature probe as an external sensor. Other 10 kΩ thermistors (R = 10 kΩ...

  • Page 14: Software Operation

    4.6. Software Operation Connect the device to a computer with the included USB cable. The device can be controlled by the LK220 software, included with the device. The most up-to-date software GUI is also available on www.thorlabs.com. Within the software, users can carry out all the operations of the panel control mode, and the PID parameters can also be adjusted.

  • Page 15: Chapter 5 Command Line Operation

    Chapter 5 Command Line Operation The LK220 can be controlled by a command-line language through the USB port. Users can either use a terminal emulator or write their own program to control the unit. The command language is described below. Prior to running the command-line interface, the included drivers should be installed, the unit should be powered on, and a USB cable should be connected between the liquid chiller and the host PC.
  • Page 16 Return the β value of the thermistor of external sensor when the external BETA? Constant sensor type is set to 8 (other 10k ohm thermistor), n from 0 to 9999 Set driving power of the coolant pump in LK220 (n = 10 - 100, Set Pump Driver PUMP=n representing 10 - 100%)

  • Page 17: Description Of Commands

     IDN? – Get device Information Queries the device part number, hardware and firmware versions. Return: THORLABS LK220 HV x.xx FV x.xx. Where HV is the hardware version; and FV is the firmware version.  ST? – Get Device Information  Return：an 8-bit byte was defined as in below table:...
  • Page 18 Liquid Chiller  TSET=n – Set Target Temperature Set the target temperature (n = -50 - 450, representing -5.0 -45.0 °C). E.g. "TSET=100" means to set target temperature to 10.0 °C.  TACT? – Get Actual Temperature Get the actual temperature (range: -10.00 - 60.00 °C, resolution = 0.01 °C). E.g.
  • Page 19  PUMP=n – Set Pump Driver Set driving power of the coolant pump in LK220 (n = 10 - 100, representing 10 - 100%). E.g. "PUMP=60" means to set the driving power of the pump to 60% of its maximum.
  • Page 20 Liquid Chiller  TI=n – Set I Parameter Set the gain value of the I share in the temperature PID control loop (n = 0 - 999, representing gain value of 0 - 9.99). E.g. “TI=200” means to set the gain value of the I share to 2.00. ...
  • Page 21 Liquid Chiller bit0=1 Ambient Temperature High bit1=1 Ambient Temperature Low bit2=1 Actual Temperature High bit3=1 Actual Temperature Low bit4=1 Low Flow bit5=1 E2PROM Incorrect bit6=1 Reserved bit7=1 Reserved When a warning occurs, the device is still operational.  MONITOR? – Get Monitor Messages Return all monitor status: Target Temperature (°C), Inlet Temperature (°C), Cold Plate Temperature (°C), Heat sink Temperature (°C), Actual Temperature (°C), Ambient Temperature (°C), TEC Current (A), TEC Driving Duty Cycle (%), Flow Rate (LPM);...

  • Page 22: Chapter 6 Maintenance

    6.2. Draining The Reservoir The reservoir of the LK220 needs to be drained before shipping the chiller. Before draining, open the hatch and remove the cap on the reservoir. Connect a small length of open tube on both the “coolant In” and “coolant out”. Slightly lift the front side the chiller and wait until all coolant flows out from the open end of the tubes.

  • Page 23: Chapter 7 Specifications

    Weight 8.1 kg This is the typical value when the LK220 chiller is used with CDTX Coolflow DTX refrigerant antifreeze, the dust filter is removed, and the target temperature is kept the same as the ambient temperature. The LK220 is shipped with the dust filter installed, which decreases the cooling power by 30 - 50 W.
  • Page 24 50% Pump Process Flow (LPM) Figure 13 The Pumping Capability of LK220 at a 25 °C ambient temperature and 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.

  • Page 25: Chapter 8 Mechanical Drawings

    Liquid Chiller Chapter 8 Mechanical Drawings Figure 14 LK220 Diagram Page 22 CTN014239-D02...

  • Page 26: Chapter 9 Certification And Compliance

    Liquid Chiller Chapter 9 Certification and Compliance Rev A, December 6, 2019 Page 23...
  • Page 27 Liquid Chiller Page 24 CTN014239-D02...

  • Page 28: Chapter 10 Regulatory

    Waste Treatment is Your Own Responsibility If you do not return an “end of life” unit to Thorlabs, you must hand it to a company specialized in waste recovery. Do not dispose of the unit in a litter bin or at a public waste disposal site.

  • Page 29: Chapter 11 Thorlabs Worldwide Contacts

    Liquid Chiller Chapter 11 Thorlabs Worldwide Contacts For technical support or sales inquiries, please visit us at www.thorlabs.com/contact for our most up-to- date contact information. USA, Canada, and South America UK and Ireland Thorlabs, Inc. Thorlabs Ltd. sales@thorlabs.com sales.uk@thorlabs.com techsupport@thorlabs.com techsupport.uk@thorlabs.com...
  • Page 30 www.thorlabs.com...

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