Owner's manual
17
GB
3. Repress the prism cover [1]. The liquid quantity
should be measured in such a way that most of
the prism surface is moistened.
4. Look through the ocular [4] and point the refrac-
tometer including its prism surface [2] towards a
bright light source if possible.
5. Looking through the ocular [4], you will see a
light and dark field. Its boundary lines indicate
the refractive index on the scale also visible in
the ocular [4].
6. By using the calibration tools [7], the scale can
be adjusted and the measuring device calibrated
by turning the calibration screw [3] behind the
prism surface [2] (underneath the rubber cap).
The light-dark-border line must coincide with the
waterline. The room temperature should be at
+20 °C.
Caution!
The scales are set at an ambient air tem-
perature of +20 °C!
Measuring Process for Antifreeze
Protection-Check
1. Lift the prism cover [1] and apply a few drops of
cooling solution to be measured to the prism sur-
face [2] using the included pipette [10]. Distribute
the liquid evenly by pressing the prism cover [1].
2. Close the prism cover [1] and look at the measu-
ring scale through the ocular [4]. Point the refrac-
tometer including its prism surface [2] towards a
bright light source if possible.
3. Turn the adjustment ring [5] on the ocular [4] to
set the focus of the vision.
4. The border line on the measuring scale moves
depending on the anti-freeze agent concentra-
tion. This light-dark-border directly shows the
freezing point of the anti-freeze mix in °C on
the anti-freeze-scale [B]. The values show the
measured value for Propylene* (G13) and the
measured value for Ethylene** (G11 / G12). The
Propylene scale must also be used if you are not
familiar with the poured-in anti-freeze protection
or if it is a mixture of both. This is the only way
sufficient anti-freeze protection of the cooling