Description
Type 28 cells are identical to Type 18 Micro cells, except these cells are supplied with a PTFE stopper, or stoppers as pictured, to fit in a ground cone to reduce evaporation of volatile samples (The Type 28B comes with stoppers even though the stoppers are not pictured). The external height is 48mm plus the stopper. Micro cells are available with either clear walls which will transmit energy or opaque black walls for improved sensitivity. Alignment of Micro cells in instrument cell holders is critical.
Smaller sample volumes can be achieved by using cell Type 28/9 or 28B9 with a 9mm instead of a 3mm thick base.
Note: Cells with a 9mm base are not suitable for instruments with an 8.5mm 'Z' dimension.
Short Pathlength Spacers
Black anodized aluminum spacers are available in three sizes for use with 1, 2, and 5mm path length cells, supporting them in a normal 12.5 x 12.5mm holder where there is no cell holder path length adjustment facility. SPA-1 (1mm), SPA-2 (2mm), SPA-5 (5mm).
| Description: | Micro Spectrophotometer Cells with stopper |
|---|---|
| Physical Configuration: | Walls parallel to the light path thickened, sample chamber is 2mm wide |
| Primary use: | Absorption measurement using reduced volume |
| Clear windows: | Two |
| Instrument: | Designed for use with spectrophotometers |
| Pathlengths available: | 5, 10, 20, 40, 50mm |
| Most commonly used path length: | 10mm |
| Cell top: | PTFE stopper in "ground type" joint. Liquid tight for up to 12 hours |
| Usage note: | Thick base (28/9) can not be used with instruments having a Z dimension of 8.5mm |
Window material: Spectrosil® Quartz or equivalent, useable range: 170 to 2700nm
| Starna Catalog No |
Path Length (mm) |
Exterior Width (mm) |
Exterior Length (mm) |
Exterior Height (mm) |
Interior Width (mm) |
Interior Length (mm) |
Base Thick-ness (mm) |
Nominal Volume (ml) |
Number Polished Windows |
| 28B-Q-5 | 5 | 12.5 | 7.5 | 48 | 2 | 5 | 2.5 | 0.35 | 2 |
| 28B-Q-10 | 10 | 12.5 | 12.5 | 48 | 2 | 10 | 2.5 | 0.7 | 2 |
| 28B9-Q-10 | 10 | 12.5 | 12.5 | 48 | 2 | 10 | 9 | 0.58 | 2 |
| 28B-Q-20 | 20 | 12.5 | 22.5 | 48 | 2 | 20 | 2.5 | 1.4 | 2 |
| 28B-Q-40 | 40 | 12.5 | 42.5 | 48 | 2 | 40 | 2.5 | 2.8 | 2 |
| 28B-Q-50 | 50 | 12.5 | 52.5 | 48 | 2 | 50 | 2.5 | 3.5 | 2 |
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