Appendix 1.  Cuvettes and Probes 
 
CIRAS-2 Operator's Manual Version 2.04 
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 Appendix 1.  Cuvettes and Probes 
Identification of Leaf Cuvette Types 
 
The CIRAS-1 was introduced in 1992.  Since that time, there have been several changes in the design of 
cuvettes.  In the following, (U) refers to UNIVERSAL, (B) refers to BROAD, (R) to RICE , (N) to NARROW, 
(C) to CONIFER and (P) to POD style cuvettes. 
 
Along with the CIRAS-2, we have produced a new type of auto-cuvette, the PLC6 (U) Universal that uses 
a series of inserts for differing types of leaves.  Any of our previous cuvettes are compatible with CIRAS-2.  
For safe and accurate operation, CIRAS-2 must be set up with control parameters for the type of cuvette 
that is in use.  Cuvettes supplied with CIRAS-2 and the PLC6 (U) will already be labelled.  If you are using 
an older cuvette, you must identify it.  The following tables will help. 
 
Examination of the window material, its shape and size, and the size of the leaf aperture that can be seen 
beneath it, will lead to the identification of your cuvette.  
 
Leaf Cuvettes fitted with a FLAT GLASS WINDOW 
 
Dimensions of Glass 
Window 
25mm x 18mm 
25mm x 7mm 
18mm Diameter 
 
 
Leaf Cuvettes fitted with a PLASTIC HEMI-CYLINDER 
 
 
 
Having identified the cuvette type, we recommend placing a label on your cuvette or document it 
somewhere in your operator‟s manuals for future reference.