MRC MIA-LA, Руководство по эксплуатации

Страница: 63 / 92

Ultrasonic milkanalyser
Operation manual 63/92
2-2,3% FAT; 8.7-9% SNF; 3,3-3,5 % Protein; 4,8-4,9% Lactose; 0,75 Salts;
1030-1033 kg/m3 Density.
The second cow milk sample with high fat content to be with the following
parameters:
5-5,3% FAT; 8.4-8,79% SNF; 3,1-3,2% Protein; 4,6-4,7% Lactose; 0,7 Salts;
1028-1029 kg/m3 Density.
If, after milk’s separation you do not obtain samples in the requested range,
then, by adding milk with high fat value into the low fat milk sample you can
obtain necessary value-2,3%
Analogous to this, by adding low fat milk sample into a milk sample with high
fat value you may receive 5,3%
Samples with medium values are received by mixing low fat and high fat
samples in necessary proportion.
If there is a need of longer sample storing they have to be preserved; the
most commonly used preservative is potassium dichromate (K2Cr2O7) - 1 g
for 1 000 ml.
When using samples, stored shortly, preliminary pour the sample from one
vessel to another in order to distribute the milk components evenly paying
attention not to form foam in the sample.
When the samples are stored for a longer period it is recommended to warm
it up to 35-45 °
С, and the vessel to be shaken carefully. In case that there is a
cream stuck on the vessel’s surfaces – remove it. The sample is poured from
vessel to vessel several times and is cooled down (advisable to 20 °
С /.
If there is separated liquefied fat or white particles with irregular form on the
vessel’s walls reliable results could not be received.
Because it is very difficult both lactose and salts to be measured but they are
substantial and influence in great extend when determine added water. Tha
t’s
why it is better both lactose and salts to be calculated by using SNF results.
The milk must be for sure without added water.
If you are unable to make the analysis of milk in certified methods in a pinch
you can use the following formulas:
DETERMINATION OF THE BASIC PARAMETERS IN THE MILK SAMPLE
BY USING FORMULAS IS NOT AS PRECISE AS USING THE ARBITRARY
METHODS, BUT IS SUITABLE FOR USAGE IN FIELD WORK.