Proline Promass 83 PROFIBUS DP/PA Commissioning
Endress+Hauser 75
Concentration measurement with flexible calculation function
Under certain application conditions, it may not be possible to use density functions with a fixed
calculation function (% mass, °Brix, etc). However, user-specific or application-specific
concentration calculations can be used with the “FLEXIBLE” setting in the function “DENSITY
FUNCTION (7000)”.
The following types of calculation can be selected in function “MODE (7021)”:
•% MASS 3D
•% VOLUME 3D
•% MASS 2D
•% VOLUME 2D
•OTHER 3D
•OTHER 2D
Calculation type “% MASS 3D” or “% VOLUME 3D”
For this type of calculation, the relationship between the three variables – concentration, density
and temperature must be known (3-dimensional), e.g. by a table. In this way, the concentration can
be calculated from the measured density and temperature values by means of the following formula
(the coefficients A0, A1, etc. have to be determined by the user):
K Concentration
ρ Currently measured density
A0 Value from function (COEFFICIENT A0 (7032))
A1 Value from function (COEFFICIENT A1 (7033)
A2 Value from function (COEFFICIENT A2 (7034)
A3 Value from function (COEFFICIENT A3 (7035)
A4 Value from function (COEFFICIENT A4 (7036)
B1 Value from function (COEFFICIENT B1 (7037)
B2 Value from function (COEFFICIENT B2 (7038)
B3 Value from function (COEFFICIENT B3 (7039)
T Currently measured temperature in °C
65 1321.46 1316.56 1311.38 1305.93 1300.21 1294.21 1287.96 1281.52
70 1352.55 1347.49 1342.18 1336.63 1330.84 1324.80 1318.55 1312.13
75 1384.58 1379.38 1373.88 1368.36 1362.52 1356.46 1350.21 1343.83
80 1417.50 1412.20 1406.70 1401.10 1395.20 1389.20 1383.00 1376.60
85 1451.30 1445.90 1440.80 1434.80 1429.00 1422.90 1416.80 1410.50
Source: A. & L. Emmerich, Technical University of Brunswick; officially recommended by ICUMSA, 20th session 1990
Brixgrade (density of hydrous saccharose solution in kg/m
3
)
°Brix 10°C 20°C 30°C 40°C 50°C 60°C 70°C 80°C
K = A0 + A1 + A2 + A3 + A4 + B1 T + B2 + B3 T
⋅ ρ ⋅ ρ ⋅ ρ ⋅ ρ
.. .
T
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