take note
•
Increase
of the PU value by 18 %
If the temperature is too high there is:
♦
An impact on product quality and taste
♦
A waste of energy
If the temperature is too low there is:
♦
A risk of microbiological contamination
♦
Risk for consumers’ health
Flash pasteurisation of bottled beer
Accurate and fast temperature control is a precondition for the best
quality and taste. Slight temperature increase of 0,5°C leads to an
increase of the PU value by 18%.
Typical PU values for flash pasteurisation of bottled beer is
20…30 PU with 68…75°C for 30…60 seconds treatment time.
Example:
Required control range: 26 PU < real PU value < 30 PU
• Pasteurising time = 30 seconds ≅ constant (determined by the
required flow rate and the pipe length)
• Required minimum temperature
≥
72°C 0,5 min * 1,393
(72°C-60°C)
= 26,7 PU
What happens, if the temperature increases by only 0,5°C?
• 0,5 min * 1,393
(7,.5°C-60°C)
= 31,5 PU > 30 PU
• Increase of the PU value by 18%
TEMPERATURE MEASUREMENT
If the temperature is too high there is:
• Loss of product quality and taste
• Waste of energy
If temperature is too low there is:
• Insufficient conservation
• Limited storage life in terms of quality and taste
Conclusion
So what is the Perfect Solution for Flash pasteurisation? Making use
of the fastest sensor in the world – iTHERM.
Abbreviations/Acronyms
HACCP – Hazard Analysis and Critical Control Points
HTST – High Temperature Short Time
PU
– Pasteur-Units
UHT
– Ultra High Temperature
Benjamin Mlangeni is Product Manager of Temperature System Components
and Registration at Endress+Hauser. Natlee Chetty is Industry Manager for the
Food & Beverage Industry at Endress+Hauser South Africa.
Enquiries: Tel: +27 (0) 11 262 8000 or email Benjamin.Mlangeni@za.endress.com
• Flash Pasteurisation is used for careful preservation
of perishable beverages.
• Accurate temperature control is a precondition for
product safety, quality and process efficiency.
• The name, Pasteurisatiom, derives from the French
Chemist, Louis Pasteur, who invented the heat treat-
ment of beverages.
PU = time (min) * 1,393
(T - 60 °C)
PU =
time * (min) 1,393
(
T
- 60 °C)
Heat Exchanger
Pump
Holding Tube
Flow rate
Pipe
Length
23
August ‘16
Electricity+Control