3
OPERATING PROCEDURE
1. With the
COVER PLATE
open, clean the
PRISM
with a
soft cloth to avoid scratching the surface.
2. Aim the refractometer toward a light source and rotate
the
EYEPIECE
to obtain the clearest focus.
3. Zero Point Calibration:
A. Open the
COVER PLATE
.
B. Apply a few drops of the included Distilled Water
onto the
PRISM
platform.
C. Close the
COVER PLATE
.
D. Turn the
CALIBRATION SCREW
until the dark and
light boundary line coincides with the bottom line
of the scale.
4. Carefully dry the prism platform and
COVER PLATE
.
5. Place a few drops of the test solution on the prism and
close the
COVER PLATE
so the solution spreads evenly
on the prism.
6. Aim the front of the refractometer towards the light
source and focus the eyepiece on the boundary line.
7. The boundary line indicates the v/v percentage of
alcohol in the test sample at 20°C.
8. After use, clean the prism with distilled water and a cloth
to remove any residue.
Note:
The temperature of the zero point calibration
should be at the same temperature as the test solution.
For variations in temperature the zero point should be
adjusted once every 30 minutes.
Note:
For beer or wine, this unit is to be used in conjunction
with a hydrometer before and after fermentation process.