Jokisch Fosia Test H.R

Jokisch Fosia Test H.R

Old productname: Hand refractometer

The concentration determination with a hand refractometer is an advantage, because it is possible to test emulsions as well as synthetic coolant fluids.

Hand refractometer
  • Important note for the use of cooling lubricants!
  • Instructions for use

All water mixable cooling lubricants (emulsions as well as clear solutions need to be – as far as the concentration is concerned – permanently checked, depending on the required mixing ratio, e.g. 5% = 1:20. Because the water, which is in the cooling lubricant evaporates, the
concentration is rising continuously.

This can cause some negative effects, e.g.: increased cooling lubricant consumption, an increase in the pH-value. On the other hand there is the danger,
that the dilution is too strong and thus the corrosion protection is insufficient. Long-term stability may then no longer be assured. To determine
concentration levels with a hand refractometer is an advantage, because emulsions as well as synthetic cooling lubricants can be tested. The use is very
The consumption of cooling lubricants is thus considerably reduced, and significantly reduced disposal costs are incurred!

1. Set the scale

The most important practical measurement is the setting of the scale and its check, whether it has to be corrected or not. If yes, the scale can be
adjusted for use. To do this, set the regulation screw appropriately. For this setting use distilled water type „Standard 32".
0% on the scale of this hand refractometers is set for distilled water at the temperature of 20° C. Open the prism cover and apply one drop of distilled
water to the surface of the illuminating prism. Close the prism cover and look through the eyepiece lens. You see a horizontal borderline of brightness
and darkness as well as a vertical scale in the optics. If the scale is in order, the horizontal borderline and the vertical scale have to coincide at 0%.
If not, the scale has to be adjusted with the regulation screw. This has to be done while you are looking through. By turning the regulation screw,
the horizontal borderline can be moved up or down. This way you can make the horizontal line coincide with the vertical scale at 0%. Normal
daylight is sufficient for all types of hand refractometers, only the angle of incidence of light varies.
2. Practical measurement
Wipe the distilled water off. Adjust the scale as usual. Then apply some drops of the substance to be measured. The prism cover has to be closed. And then you
can read the scale value off at the point where the horizontal borderline coincides with the vertical scale in the optics. The scale value has to be multiplied by the
refraction value of the KSS to obtain the application concentration.
After each measurement the substance has to be removed carefully and meticulously with cellulose and a soft cloth.
Hand refractometer „Standard 32"
Standard-temperature: 20° C
Measuring range: 0 - 32 %
Accuracy: ± 0.2 %
Standard-substance for setting the scale: distilled water

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