Common sugar meter and its detection principle
1. Handheld refractometer
The phenomenon of refraction occurs when light enters another medium from one medium, and the ratio of the sine of the incident angle is constant, and this ratio is called the refractive index. The content of soluble solids in wort or beer is proportional to the refractive index under certain conditions (same temperature and pressure), so the concentration of wort or beer (the amount of sugar content) can be obtained by measuring the refractive index of wort or beer ).
.2 Brix meter with temperature (density meter)
The temperature-attached sugar meter finally calculates the sugar content of the liquid by detecting the density of the liquid. We assume that the mass of the sugar meter = m
F float = mg.
According to Archimedes' principle, the buoyancy force on the density meter is equal to the gravity on the liquid it displaces, there is F float = ρgV row,
From the above two formulas, it can be obtained that ρgV row = mg,
That is, ρ=m/V row.
Sugar meter operation and precautions
1 Hand-held shading meter Open the cover of the hand-held refractometer
(a), Carefully dry the glass surface of the prism with a clean gauze or roll-up paper. Put 2 drops of distilled water on the prism glass surface and cover with a cover slip. in a horizontal state, from the eye
Observe at (b), and check whether the boundary line between light and dark in the field of vision is on the zero line of the scale. If it does not coincide with the zero line, turn the scale adjustment screw to make the dividing line just fall on the zero line. Open the cover, dry the water with gauze or rolled paper, then drop 2 drops of beer or wort on the glass surface of the prism as above, observe, and read the scale on the boundary line between light and dark in the field of vision, which is beer or wort Medium soluble solids content (%) (approximate content of sugar). repeat three times.
