Analyzing Samples 
52  Agilent Cary 630 FTIR Spectrometer User’s Guide 
2  Place a small amount of sample material on the bottom sample 
mounting window (see Figure 16). The sample mounting window 
is the 2 mm diameter yellow material held in place by the 
surrounding metal disk. 
 
Figure 16. Placing sample on the DialPath accessory sample mounting window 
3  Ensure that the sample covers the entire surface area of the 
sample mounting window. 
 
In the case of a volatile sample, such as with fuels analysis, larger 
amounts of sample can be applied without concern of leakage or 
damage to the instrument; however, using the smallest amount of 
sample possible will ease in the cleaning process. 
 
Although it is safe to run a variety of liquid samples, including 
aqueous solutions or even thick pastes such as grease, the 
DialPath is not to be used with any solid or powder samples, such 
as tablets. Using the DialPath with solid samples will damage the 
ZnSe windows or modify the pre-set transmission pathlength.  
CAUTION 
The top and bottom windows are made from ZnSe. ZnSe can be damaged by 
samples with a pH below 4 and above 9. Only measure samples with a pH 
between 4 and 9. 
 
4  Close the DialPath by rotating the arm clockwise until it clicks 
into place. 
5  For instructions on collecting a sample spectrum using the 
software, refer to the Agilent MicroLab PC Software User’s Guide.