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The density meter (Fig. 9.2, pos.1) is a hollow glass
float with a ballast at the bottom and a thin glass tube on top,
which contains a scale of density.
Supplied with different boundaries densimeter density
scales for determining the density of nearly all types of fuels,
oils and technical liquids. Produces three types of densimeters:
in the first type of dosimeters the price of the scale divisor is
3
3
equal to 0,5 kg/m , but in the second and third 1,0 kg/m .
Densimeters of the first and second types are equipped
with thermometers, and in the third type of thermometer there
is no, and to measure the temperature of the petroleum product,
it is necessary to use an additional thermometer. Densimeters
3
3
usually calibrate in g/cm , so to determine the density in kg/m
the result of measuring the density must be multiplied by 1000.
The investigated fuel is maintained at room temperature,
to assume the ambient temperature. After that, he carefully
poured into a glass cylinder capacity 100 ml.
Choose the oil densimeter with the appropriate division
3
of the scale: for diesel fuel and oil – 810-910 kg/m .
Pure and dry oil densimeter are taken over the top and
slowly immersed in the product under study so that it does not
touch the walls of the cylinder.
After stopping the immersion, calculate impressions on
the scale of density and temperature. Density displays are
carried out at the upper edge of the meniscus. The observer's
eye should be at the level of the meniscus of the liquid (Fig.
9.2, item 3). The countdown on the dosimeter scale gives the
t
fuel density at the test temperature t, that is  . The measured
density is brought to a density at a temperature 20 С by the
formula (9.2).
According to the results of the study, the table is
compiled. 9.4. Comparing its data with the indicators of the
technical standards of the standard for diesel fuel, justify the
conformity of the standard model.

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