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| • Rapid, precise Peltier control over a wide range of temperatures • Variable speed magnetic stirring • Dry gas purge • Optional remote computer control • TC 125 temperature-controller included Description The top of the TLC 40 is a 50 x 50-mm square tower with the cuvette in the center. The height of the tower is cut to fit the dimensions required by the spectrometer in which it is used. A metal core in the tower holds the cuvette to regulate its temperature, and a plastic housing surrounds the core, providing thermal insulation. The TLC 40 has optical ports on opposite sides of the tower to permit the passage of light through for the absorbance measurement. Each port is 10 x 10 mm in size, a size adequate to accommodate the light beams for nearly all spectrophotometers. The temperature of the TLC 40 tower is controlled by a thermoelectric cooler (TEC), a device using the Peltier principle. The TEC pumps heat into or out of the tower. For heat removal, a small flow of water passes through a heat exchanger under the TEC. For magnetic stirring, a magnet is located directly under the cuvette and is rotated using a small, precision, Swiss motor. If needed, a flow of dry gas may be passed through the base of the tower for partial temperature equilibration and then directed into the optical ports next to the cuvette surfaces, thus minimizing condensation. In a dual-beam spectrophotometer, such as the Cary 300, the TLC 40 is provided on a larger base with a second, non-regulated holder. If you are interested in temperature control for both the reference and sample cuvettes in a dual-beam instrument, please see the TLC 42. The TLC 40 includes a matched and calibrated TLC 125 Temperature Controller. Cuvette Size and Types The insulated temperature-controlled tower of the TLC 40 holds a standard 10 x 10 mm path length square cuvette. To maximize thermal contact, the cuvette is held into one corner of a tower by a metal spring clip. In its standard configuration, the TLC 40 is designed for a “z-height” of 8.5. Thus, the optical center line, or middle of the optical port, is 8.5 mm above the bottom surface of the cuvette. This is a convenient dimension because it minimizes the sample size in most cuvettes. It is also a standard height for microcuvettes and flow cells. Special Options
Mounting Requirements As you can see in the page on Aftermarket Cuvette Holders, Quantum Northwest has the necessary knowledge to make versions of the TLC 40 for most common commercial spectrophotometers. If you do not find your instrument in the list, please contact us anyway. With a little help on dimensions and the configuration of your spectrometer sample compartment, we can usually make a custom cuvette holder for a price comparable to that of one of our normal products. We are happy to do this, because it helps us learn about different instruments. To make a version of the TLC 40 for a spectrophotometer, we must know some basic information about the floor plate of the sample compartment and how we must make a base plate that will mount in place. We also must know the height of the optical center line above the floor of the sample compartment. An easy way to determine this basic information for a new spectrophotometer is to measure an existing non-regulated cuvette holder. Utilities for the cuvette holder include two tubes for water (or other coolant), one tube for dry gas, and an electrical cable. These must pass out of the sample compartment in a manner that does not disrupt the measurement. Suitable methods for getting the utilities out of the sample compartment have been found for most common spectrophotometers, but we may require assistance and suggestions for new instruments. Performance The TLC 40 has temperature performance very similar to that of the TLC 50. The temperature of the holder changes rapidly and may be maintained at ±0.02 °C. Availability You will need to specify the spectrometer in which the TLC 40 will be used. You will also need to tell us if you want a special option such as a different z-height or a high temperature option. Tell us if you would like a BATH 100 water circulator and whether you would like the WJ-40 Windowed Jacket for work at extreme temperatures Considering all of the spectrometers that may be fit with a TLC 40, and the special units for high temperature and various z-heights, there are, over a hundred different versions available for the TLC 40. Some common configurations, such as the TLC 40 for the Cary 50, can usually be shipped within about 3 days, but most require about 1 to 2 weeks for parts fabrication, assembly and calibration. Units that require special modifications, such as high temperature versions will typically require 2 to 3 weeks. New configurations require getting necessary dimensions and preparing designs will, of course, also require additional time for design. Please contact us with your questions or to request a quotation. |
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