For the customer who needs something special: Independent temperature control for sample and reference
The TLC 42 product permits independent temperature control for the sample and reference cuvettes. Measure absorbance as a function of temperature, keeping the reference at the same temperature as the sample, or measure the differential effect of temperature on a sample by measuring the difference in absorption when the two cuvettes are held at different temperatures.
Higher temperatures up to 150 °C
Add /E to the model numbers of the TLC 40, TLC 42 or the TLC 50 to get a modified cuvette holder that will control temperature up to 150 °C. This option requires changes in the firmware of the temperature controller, modifications in magnetic stirring mechanism to move the motor away from excess heat and changes in certain internal components to make them tolerate higher temperatures.
“ z” height variants for special cuvettes
The temperature-controlled cuvette holders for the Varian product line have a standard “z” height of 8.5 mm between the bottom of the cuvette and the optical center line of the spectrometer. This minimizes the volume required in a standard one cm square cuvette and matches a standard z height for microcuvettes. Alternatively, for a small additional cost, the TLC 40, TLC 42, TLC 50 and TURRET 400 may be also made to a z height of 15 mm, another standard height for microcuvettes. The single cell TLC 40, TLC 42 and TLC 50 can also be made for a z height of 20 mm to match cuvettes sold by Varian. If you want one of these special z height cuvette holders, add a /Z15 to the model number to get a 15 mm z height or /Z20 for a 20 mm z height.
One cuvette holder for either the Cary 50 or the Eclipse
We now offer an economical solution to the customer who wishes to purchase a single cuvette holder and use it for both absorbance and fluorescence measurements. A TLC 50/Univ is a cuvette holder that may be used in both the Cary 50 UV/Vis spectrophotometer and the Eclipse Fluorometer. Purchase this powerful pair of spectrometers with uncompromising temperature control and add another cuvette holder later when your budget permits.
4-windowed cuvette holder for a UV/Vis spectrophotometer
For certain experiments, one may wish to use a cuvette holder with additional windows perpendicular to the light beam of a UV/Vis spectrophotometer. Perhaps there is a need to pass a laser beam through the sample or perhaps to measure light emissions from the sample while an absorbance measurement is being made. Since the 4-windowed TLC 50 has the same outer dimensions as the TLC 40, it may be used in its place. The TLC 50 has four optical ports 12 mm high by 10 mm wide, one on each side of the cuvette. It also has optical slits to limit the extent of light entering or leaving the cuvette. Contact us if you would like to replace any cuvette holder of a TLC 40 or TLC 42 product with a 4-windowed version.
Low temperature operation
Operating inside of a Varian spectrometer with a flow of dry gas on the windows and circulating ice water to remove heat from the Peltier unit, these cuvette holders will operate down to about -25 °C. For frequent work at any temperatures below about -10 °C or so with the TLC 40, TLC 42 or the TLC 50 single cuvette holders, we recommend the use of a windowed jacket to isolate the cuvette. A windowed jacket is a block of insulating plastic with AR-coated fused silica windows to permit light to enter or leave the cuvette. Use a WJ-40 for a TLC 40 or TLC 42, or a WJ-50 for a TLC 50. With a windowed jacket and pre-cooled circulating fluid at a temperature of about -15° these cuvette holders will function well down to -40 °C. Even lower temperatures may be used. Contact us for advice on how to work at very low temperatures.
Custom sample holders available
Quantum Northwest designs and builds custom sample holders. Contact us about any special needs you have. |
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