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| • Rapid, precise Peltier control over a wide range of temperatures • Optical ports on all four sides of the cuvette with generous light access. • Vertical adjustment can be used to match the beam height of typical lasers • Micrometer-driven horizontal translation allows precise positioning of light beams in the cuvette. • Variable speed magnetic stirring • Dry gas purge • Access plug for probes to make physical contact with the cuvette surface • Optical slits provided • Optional remote computer control • TC 125 temperature-controller included Description The FLASH 300 cuvette holder has optical ports on four sides of the cuvette. Each optical port is 12 mm high by 10 mm wide. Since the tower structure is flattened in one dimension, collimated beams, such as those from laser sources, are typically passed through the lateral optical ports. Other light may be passed perpendicular to this direction using the remaining two optical ports. These optical ports on the side accept light at a greater angle, and are thus good for arc sources or for efficient light collection using lenses. An access plug on one side provides access to the cuvette surface for special detectors such as the ultrasonic transducers used in pulsed-laser photoacoustics. Special inserts could easily be designed as needed to accommodate a variety of probes such as fiber bundles. An opaque lid and cap limit light from entering or leaving the top of the holder. The cuvette is surrounded by a temperature-controlled central metal tower and the tower is, in turn, surrounded by a plastic insulating housing. A temperature sensor, used for PID temperature control, is mounted in a corner of the metal tower at the height of one of the windows. To control the temperature, a Peltier unit is sandwiched between an internal metal base plate under the central tower and a brass heat exchanger. A small, Swiss, brushless motor is mounted within the heat exchanger and rotates a magnet under the sample for magnetic stirring. A vertical adjustment ring raises and lowers the upper section of the FLASH 300, varying the height of the center of the cuvette window from 85 to 113 mm above the surface of the table. The user must circulate water through the heat exchanger to remove heat from the Peltier unit when the temperature of the cuvette holder is lowered. Two hose barbs for water accept _-inch ID vinyl tubing for this purpose. A third hose barb may be used to provide dry gas to reduce condensation when working below the dew point temperature. When connected, dry gas passes through a labyrinth of holes in the base under the cuvette tower to first partially equilibrate to the temperature of the cuvette. It then blows up through holes in the metal tower into the four regions next to the cuvette faces. For mounting on an optical table or breadboard, the slots in the base of the FLASH 300 are dimensioned to accommodate either standard _-20 screws with tapped holes on 1-inch centers, or metric M6 screws on 25 mm centers. A horizontal micrometer adjustment moves the entire body of the FLASH 300 back and forth on optical rails over a 1 cm distance. Thus, if a laser beam is passed through the lateral optical ports, turning the micrometer provides a fine adjustment of the position of the laser beam in the sample. The FLASH 300 includes a matched and calibrated TLC 125 Temperature Controller. Cuvette Size and Types The FLASH 300 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. The optical center line, or middle of the optical port, is 10.5 mm above the bottom surface of the cuvette. This dimension combined with the 12 mm height of the optical port, means that most special microcuvettes or flow cells that are made for a z-height of 8.5 mm will work well in the FLASH 300. Photoacoustics Option
Other Options
Performance
Availability A FLASH 300 of standard configuration can usually be shipped in 1 to 2 weeks of receipt of order. However, the FLASH 300 is designed for research and research nearly always involves doing something that has not been done before. We frequently make modifications to optimize the FLASH 300 to different applications. Some changes are as simple as a replacement of the base and some as complex as the addition of lenses and photomultiplier housings. Please contact us if you have special requirements. It is likely that we can accommodate your needs for minimal additional expense. Manufacture of the FLASH 300 will take longer if the modifications are extensive. If you are interested in using the FLASH 300 for photoacoustics, then you may purchase the photoacoustics option as well as a transducer and preamp (see Price List for Photoacoustics). We resell the Panametrics V103RM transducer and its matched 5662 battery-operated preamp. If you would like to use a different transducer of your own choice, and the transducer is of the same size or smaller than the V103RM, we will be pleased to modify the PAS 300 appropriately. |
Quantum Northwest provides temperature-controlled cuvette holders and
photoacoustic instrumentation |
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