Pentair HAFFMANS c-DGM - Appendix I: Formulas; Haffmans CO2 Formula

HAFFMANS c-DGM/i-DGM
c-DGM/i-DGM Page 63 of 78
Appendix I Formulas
Haffmans CO
2
formula
Attention! The partial pressure of foreign gases is not included in the
calculation.
[ ] [ ] [ ]
( )
[ ]
EebarpbarpAgewichtsCO
T
D
C
atm
+×+×=








+°
+
25,273C
2
%
A = conversion factor/compensation factor (1*)
p = gas equilibrium pressure (partial)
p
atm
= atmospheric pressure in bar
C = product-dependent factor (-10.74*)
D = product-dependent factor (2617.25*)
T = temperature of the liquid in °C.
E = factor for CO2 unit p20 (kg/cm²), only applicable in Japan.
Also see Appendix II, tables 2 and 3
* The Haffmans CO
2
formula is based on the solubility of CO
2
in beer with an original wort of 12°
Plato and an apparent attenuation of 80%. When the composition of the sample deviates from
this standard, the Haffmans CO
2
formula must be adjusted by changing the constants A, C
and D.
Example for beer:
In beer, the solubility of CO
2
changes by approximately 1% per 3 °Plato. For beer with an
original wort content of 12 °Plato, the solubility of CO
2
is 4% lower than the solubility of CO
2
in
water.
Example for soft drinks:
In soft drinks, the solubility of CO
2
changes by approximately 1% per Brix. For soft drinks with a
sugar content of 10 Brix, the solubility of CO
2
is approximately 10 % lower than the solubility of
CO
2
in water.
For this soft drink, the product-dependent C factor should be set to -10.80.
Example for water:
For most carbonized waters, experience has shown that the product-dependent C factor should
be set at -10.70.