4
For the models SK-200R (for concentration of salt water)
(w/ auto temperature correction)
Accessories: Wipe-out cloth, carrying case, screwdriver, dropper, distilled water
- Using the Refractometer after Adjustment with Distilled Water -
Note: Be sure to perform the scale adjustment before using this instrument for the first time
each day, or if the ambient temperature changes.
(1) Place yourself facing the light source and look through the eyepiece to see the scale. Adjust
the focus to suit your eyes by rotating the eyepiece clockwise or counterclockwise.
(2) While holding the instrument as shown in Figure 1, open the cover plate, place a few drops
of distilled water on the prism and then close the cover plate. Look through the eyepiece to
see the white and blue fields as shown in Figure 2 below
(3) Scale adjustment
This instrument is designed to allow for scale adjustment at 20°C, and the intersection of the
boundary of the white and blue fields is set to 0% when the distilled water is measured. If the
boundary is not at 0%, slowly turn the adjusting screw clockwise or counterclockwise with
the flat-bladed screwdriver supplied until the intersection is at 0% (Figure 2).
(4) After completing the adjustment, thoroughly clean the prism and the cover plate with the
cloth supplied.
(5) Measurement
To take a reading, place a few drops of the liquid to be measured on the prism. Look through
the eyepiece at the white and blue fields on the scale. The concentration of the liquid being
measured is determined by the intersection of the boundary of those fields. For example, in
Figure 3 the concentration is 16%.
Figure 1
Figure 2
Figure 3
light
