Standard rectangular fluorometer cells Type 3 are the most popular cells for general fluorescence measurement and they will fit virtually every fluorometer instrument. All four windows and the bottom of the cell are polished and because of the technique used in their construction they remain extremely flat, right to the very edge of the window, allowing them to be used in some laser applica­tions. Each cell is supplied with a PTFE cover.

Smaller volume Types 9F, 17F & 18F are identical to the Type 9 Semi­Micro, Type 17 Short­Micro and Type 18 Micro range, except that all cell walls and the base are optically polished.

This range of Micro Fluorometer cells has been specifically designed by Starna for use with the FCA range of adaptors listed below. The adaptor locates the square cross section cell accurately in the center of the instrument cell compartment. Therefore, for a given path length, the cell is optimized for minimum volume and maximum sensitivity. All four windows and the base of the cells are polished and are available with either an open top or with a PTFE stopper sup­ plied with the type 23­ cells.

The FCA adaptors have exterior dimensions of a standard fluorometer cell (12.5mm x 12.5mm) and interior dimensions to accommodate the square micro fluorometer cells listed. Apertures are machined into the adaptor wall to allow for transmission of the excitation and emission energy at either 8.5 or 15mm 'Z' dimension. The aluminum adaptors are black anodized to eliminate stray light. The correct adaptor for a particular cell can be identified from the listing below.

Types 55, 56, 57 and 58 are all cells with two chambers which can be used either in parallel or series and with the exception of Type 55­1, have all walls polished. Types 57 and 58 have the facility for the intentional mixing of two liquids within the cell itself. PTFE stoppers supplied for type 56 and type 58 as pictured.

Fluorometer cells Type 46F and 47F (Semi­Micro) are for in­ line continuous flow type applications, usually measuring at one wavelength. Samples normally flow from the bottom to the top.

Types 71F and 72F (Semi­Micro) fluorescent cells have long windows and will fit normal cell holders. They can be used with instruments of any 'Z' dimension and are particularly suit­ able for any application where sample volume is not critical.