ENGLISH
9
OPERATION
Step 1
Open the transparent cover and drip 2–3 drops of distilled water on the
prism. Close the cover so that the water spreads over the whole
surface of the prism, without air bubbles or dry patches. Allow the
water to cover the prism for about 30 seconds before continuing with
step 2, so that it obtains the correct temperature – i.e. the same
temperature as the antifreeze tester.
Step 2
Hold the transparent cover up to a light source and look into the
eyepiece. You will see a circle with a graduated scale in the middle.
(You may need to adjust the eyepiece to see the scale clearly). The
upper part of the field should be blue and the lower white. (The images
shown here and for steps 3 & 4 are only intended as reference. You
will see the correct scale on the product).
Step 3
Look into the eyepiece and turn the calibration screw until the interface
between the upper blue and lower white field are precisely at the zero
point, as illustrated.
This completes the calibration. Check that the room temperature is
correct for the liquid you are using (20°C). If the temperature in the
room or surroundings (not the sample) changes by more than 5°C, we
recommend that you recalibrate to ensure precise readings.
If the instrument has automatic temperature compensation, the
ambient temperature in the room must be 20°C when the instrument is
recalibrated.
When the antifreeze tester is calibrated, any changes in temperature
from 10–30°C will not affect the precision of the instrument.
Step 4
Now drip a few drops of the sample on the prism, close the transparent
cover and read off the scale. You will see the value where the interface
between the blue and white field cross the scale. The scale gives a
direct reading of the concentration.
Subject to printing errors and design changes over which we have no control. In the event of problems,
please contact our service department.
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