3
For the model SK-101R (w/ auto temperature correction)
Accessories: Wipe-out cloth, carrying case, screwdriver, dropper, saturation salt water
- Using the Refractometer after Adjustment with Saturation Salt 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 saturation salt 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 adjustment at 20°C, and the intersection of the
boundary of the white and blue fields is set to 29.6%.when the saturation salt water is
measured. If the boundary is not at 29.6%, slowly turn the adjusting screw clockwise or
counterclockwise with the flat-bladed screwdriver supplied until the intersection is at 29.6%
(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 38%.
Figure 1
Figure 2
Figure 3
light
