CIRAS-3 Operation Manual V. 1.09  200  support@ppsystems.com 
 
Changing PLC3 Universal Head Plates 
The PLC3 Universal is supplied with 3 different head plates: 
•  25 mm x 7 mm (1.75 cm
2
) 
•  18 mm Diameter (2.5 cm
2
) 
•  25 mm x 18 mm (4.5 cm
2
) 
Each head plate has a top and bottom so carefully note which one is the top and bottom.  They look very 
similar but they are slightly different.   Each plate is held in place by 6 small Philips type screws.  
 
 
 
 
 
 
 
 
 
 
Open the cuvette head to maximum position and using a long, thin Philips screwdriver, remove the top 
and bottom head plates.  
To ensure an air-tight seal, we recommend putting a slight smear of silicone grease between the head 
plate and cuvette head prior to securing the 6 screws. A slight smear of silicone grease can also be 
applied to the leaf gaskets themselves for improved leak tight performance. 
 
 
 
 
Bottom Plate