WOIIO
J. Charles Templeton Wh~trnonCollege WaHo, Washington 99362
A Temperature-Regulated Cell Holder for the Beckman DK-2A Spectrophotometer
A temperature-regulated cell holder for the Beckman DK-2A Spectrophotometer has been designed. This apparatus, which utilizes a temperature-regulated liquid circulated from an external bath, can accommodate any path length cell up to 100 mm, including rectangular 10 mm cells, and can maintain temperatures from approximately O" to 100°C. The cell holder can be constructed in a college machine shop in about ten hours from materials costing under $50. The cell-holder block was machined from a piece of solid brass; the end and bottom plates and the block lid
were cut from %in. brass sheet; the light-tight samplecompartment cover containing the tubing connections was formed from 28-gauge sheet metal. Copper tubing (5in. 0.d.) was used for the tubing connections. Working drawings for construction of the cell holder and sample-compartment cover are shown in Fieures 1-4. All dimensions -are in inches. A detailed description of the construction of this apparatus, including details indicated by capital letters in thefigures, is available from the author on request
Figure 1. End view of cellholder block with end plates removed.
Figure 3. End plate for the cellholder block.
Figure 2. Top view of cellholder block with end plates installed.
Figure 4. Sample-compartment cover.
Volume 50, Number 7, July 1973
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