Other methods of measuring the density and relative density of food (2)

(3) Operation steps

① Installation of Webster's balance:

a.

b.

c.

d.

②Familiar with the reading method of Webster's balance: the long arm of the balance beam is divided into 10 equal parts, which are represented by numbers (1-10) in turn

Table 2-1 The readings of different riding codes at various positions

③Determination: Pour water boiled for 30 minutes and cooled to 20°C into the glass cylinder, immerse the float in the water, place the glass cylinder in a constant temperature water bath at 20°C, and hang the unit code on the hook.

Pour out the water in the glass cylinder , wash the glass cylinder and the float with ethanol and then ether several times, and blow dry

(4) Tips

①The balance should be adjusted and balanced before use

②After the measurement is completed, all the riding codes on the V-groove and small hook of the beam should be removed, and it should not be left on the V-shaped groove and small hook of the beam

③When the balance moves, the parts, components and beams that are easy to separate should be disassembled and separated to avoid damage to the knife edge

④ According to the frequency of use, regular cleaning work and measurement performance verification should be carried out