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Milk Density Measurement during Milk Standardization

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Depending on breed and physical state of the cow and seasonal variations, the fat content of raw milk ranges between 3,5 and 5,0 %. It is usually higher than the fat content of consumable dairy products. During standardization the raw milk is split into skim milk and cream (fat) by a centrifuge. In order to manufacture a product with a precisely specified fat content, a certain part of the cream has to be dosed back into the skim milk. Milk is a multi-component mixture containing water, fat, proteins, lactose, etc., so it is not possible to determine the concentration of a single component like fat. Since the densities of skim milk and cream are known, the density change upon addition of fat is used to monitor and control the standardization process.

For density measurement, the multi-component liquid flows through a U-shaped tube. While the tube is electronically excited to oscillate at resonance, the oscillation frequency is observed. Any change in the fluid density has an impact on the detected signal and can thus be identified. Based on the correlation between concentration and density, the concentration is calculated and displayed.


 

ROHTEC

  • Available as Transmitter Version with Local Display and as Sensor
  • Highly Precise and Fast Determination of the Concentration
  • Based on Density Measurement
  • Applicable for a Huge Number of Liquids in Various Industries
  • Short Response Time and Excellent Long-Term Stability
  • Hygienic Execution, Full CIP Capability, Maintenance Free
  • Outstanding Price-Performance-Ratio

ROHTEC1


 

Technical Data

ROHTEC

 

Measuring Range

 

0 - 3 g/cm3

Accuracy

± 0,0001 g/cm3

Repeatability

± 0,00001 g/cm3

Response Time

≤ 1 s

Pressure of Operation

max. 50 bar

Temperature of Operation

- 25 - + 125 °C

Temperature Compensation

Pt1000

Material

1.4571/AISI 316Ti;

Hastelloy C276; Monel 400;

Incoloy 825; Tantalum;

others on request

Connections

thread 3/8”; compatible to

Varivent© Inline-Housings

DN40 - DN150; others on request

Input

Transmitter Version

6 x digital (24 VDC)

Output

Transmitter Version

3 x digital (24 VDC) &

2 x analog (4 - 20 mA)

Profibus DP

Transmitter Version

Sensor (w/o local display)

 

option

standard

Enclosure Rating

IP65

Explosion Protection

Ex II 2G EEx d IIC T6

option

Power Supply

24 VDC

 

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