Figure 133 Verification Display; Figure 134 Typical Optical Images - Vaisala PR-23 Series User Manual

PR-23 Series User Guide
Figure 133 Verification display
Clean and dry the prism and the sample holder very carefully between the RI liquids. Use a
suitable solvent, for example ethanol or IPA (Isopropyl alcohol).
To check that the standard liquid is properly wetting the prism, it is possible to press soft key
OPT. IMAGE. The optical image should show a sharp shadow edge, see the following figure.
Figure 134 Typical optical images
A verification data collection method is implemented in the DTR. The instrument measures
each verification data point ten times and uses the average of these measurements.
Measuring each verification liquid takes approximately 10 s, during which the measurement
progress display is shown, as shown in the following figure. Wait until the verification step 2
display reappears before proceeding to the next verification liquid.
244
IM-EN-PR23-E