LABEC M-MIA-A - Manual (Page 70)

Ultrasonic milk analyser
When examining samples taken immediately before analyses and shortly
stored, the milk is poured several times from vessel to vessel in order to
distribute the fat content uniformly. To avoid foam formation or separation of
milk fat, the samples have to be carefully poured using the walls of the
vessels, as they are tilted slightly. For a better mixing the sample it has to be
poured at least 3 times. When needed the same is tempered to the
temperature within the measuring range.
If there is fat stuck on the walls of the vessel and the stopple (when the
samples were stored for a long time), the milk has to be slowly heated up to
35-40
o C. At the same time it has to be slowly shaken. The cream, stuck to
the walls of the vessel is removed. The sample is poured several times and is
cooled down (advisable up to 20
o С).
If there is separated liquefied fat or white particles with irregular form on the
vessel’s walls reliable results could not be received.
Whey
Before making analyses the whey sample is filtered through double sheet
gauze put over the glass funnel in order to separate the fat grains get into
liquid by incidence and if it is needed the sample is tempered and carefully
stirred.
Buttermilk
Before making analyses the buttermilk sample is filtered through single sheet
gauze put over the glass funnel in order to separate the big protein particles
and if it is needed the sample is tempered and carefully stirred.
Cream
The sample is slowly warm up to 35 – 40
o С in water bath. The fat is
dispersed wholly by carefully shaking and if necessary, by stirring with glass
stick. The sample is poured from vessel to vessel several times and is cooled
down (advisable to 20
o С). If after this procedure the sample is not
homogenous, the measurement is not carried out.
Sample for analyses is prepared from homogenized cream by diluting it with
distilled water in degree, sufficient for the components of the diluted cream to
be reached in the measuring range of the analyser.
Operation manual MRC.VER.01-02.10