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8. Measurement of liquid sample
WARNING
CAUTION
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When using this instrument for measuring matters harmful to humans, very carefully do
it with gloves and proper mask as well as with a good knowledge of the characters of
the matters.
When the refractometer smells nastily, smokes or is overheated, immediately turn it off
with the power switch and unplug the power cable from the outlet.
If the refractometer is continuously operated in such a condition, it may cause a fire or
damage to the refractometer. In such a case, ask the dealer or our distributor to inspect
the refractometer as well as to investigate the cause.
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Don't wet the refractometer except the prism surface with water or sample liquid
unreasonably. If the refractometer gets wet excessively, it may cause malfunction and
breakdown of the refractometer.
Don't tap or pick at the prism surface with a metal spoon, tweezers, etc. because the
prism surface is made of optical glass.
If the prism surface is scratched, the refractometer may fall in measurement.
When measurement is complete, wipe up sample from the prism surface and its
surroudings with soft tissue moisted with water first, and then wipe the wet parts with
dry tissue to dry them up.
After measurement of a sample of a high molecular compound, oil and fat, etc., wipe
the prism surface with tissues moistened with alcohol or neutral detergent first and then
wipe it up again with dry tissue to dry up.
On ending a day's measurement, turn off the power switch.
When transporting the refractometer, make sure to put it in the carton case which the
refractometer was initially contained in.
a) Open the secondary prism (Fig. 8-1)
and drip 2 or 3 drops sample liquid
onto the center part of the main
prism surface (Fig. 8-2). Then, gently
close the secondary prism. The
sample spreads between the main
prism and secondary prism as a thin
film.
Fig. 8-1
b) Adjust the position (height) of the
sample illuminator lamp so that the
light is let in just right through the
lighting hole in the secondary prism
(Fig. 8-3).
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