LABEC M-MIA-LA - Manual (Page 81)

Ultrasonic milkanalyser
Operation manual 04.11.09 79/107
APPENDIX 5: EASY CALIBRATION OF THE MILK ANALYSER
BY CALCULATING THE BASIC PARAMETERS VIA 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.
5.1. Determination some of the parameters by formulas
There is dependence between the different parameters in milk and its
density, which may be expressed with mathematical equation. On this base
different formula, tested and confirmed by the classical laboratory methods
for analyses, are developed. We recommend the following:
5.2. SNF determination.
For determination of SNF the correlation dependence exists between the
milk’s density, fat and SNF in the milk. When the density and the fat are
known, the SNF can be calculated.
There are several formulas with different applicability.
А/ When the salts and fat are known
SNF is calculated by subtracting the fat percentage from the salts.
SNF = Salts – F (%)
Where
Salts – salts in (%),
F
– fat content in (%),
This formula is used for determination of SNF in whey, buttermilk, and cream.
B/ Known quantity of fat and density (most commonly used method when
maximum accuracy is needed).
We recommend the following formula:
This is a universal formula and actual for milk of almost all kind of cows and
sheep all over the world.
378 , 0
/ 100 100 % 075 , 0 density F
SNF
− + ∗
=