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| • Rapid, precise Peltier control over a wide range of temperatures • Magnetic stirring in all four positions • Powerful stepping motor for position control • Dry gas purge • Optional remote computer control • TC 425 temperature-controller included Description The rotating top of the TURRET 400 is disk shaped with a diameter of about 95 mm. There is a temperature-controlled metal core with cuvettes evenly spaced on the periphery. A plastic cover provides insulation and holders for optical slits that may be placed in front of each the twelve optical ports around the cuvettes. Each optical port is 12 mm high by 10 mm wide. The turret may be used in a straight through absorption or CD measurement. It may also be used for fluorescence in either an “L” or “T” format. Depending on the spectrometer in which the TURRET 400 will be used, it can be supplied in two main configurations. In a gear-driven version, a stepping motor is housed above the floor plate and the turret turned using gears. In a belt-driven version, the motor is mounted below the floor plate and turret turned using a belt drive. The TURRET 400 can be built to accommodate different optical center line heights for different spectrometers. The temperature of the TURRET 400 tower is controlled by a large, square (40 x 40 mm) 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 and precision Swiss motor is located directly under each cuvette. If needed, a flow of dry gas may be passed through the base of the turret for partial temperature equilibration and then directed into the optical ports next to each of the twelve exposed cuvette surfaces, thus minimizing condensation. Since the cuvettes are symmetrically located about the square TEC, each is mechanically identical. Therefore, the TURRET 400 is quite suitable for experiments in which four samples must be maintained under very similar conditions. The TURRET 400 includes a matched and calibrated TLC 425 Temperature Controller with four position buttons on the front panel to rotate the turret to its four positions. Cuvette Size and Types The TURRET 400 holds standard 10 x 10 mm path length square cuvettes. To maximize thermal contact, each cuvette is held into one corner of one of the cuvette positions by a metal spring clip. In its standard configuration, the TURRET 400 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 many commercial spectrometers. Due to its larger size, the TURRET does not fit into as many spectrometers as the smaller single cuvette holders. Nevertheless, If you do not find your instrument in the list, please contact us anyway. We will tell you whether a TURRET will fit in your instrument. If so, we can usually make a custom TURRET 400 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 TURRET 400 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 two electrical cables. 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. Availability You will need to specify the spectrometer in which the TURRET 400 will be used. You should also to tell us if you are interested in any of the special options available with this product. Most TURRET 400 products may be shipped in two to three weeks after receipt of order. 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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