Endress+Hauser Proline Promass 83 - Page 127

Device Functions Proline Promass 83 MODBUS RS485 10 Block SPECIAL FUNCTION
Endress+Hauser 127
SQUARE
EXPANSION
COEFFICIENT
MODBUS register:
Data type:
Access:
7008
2224
Float
read/write
! Note!
Function is not available unless °BAUME < 1SG, °BAUME >1SG, °API, °PLATO,
°BALLING or °BRIX was selected in the DENSITY FUNCTION function (7000).
For entering the fluid-specific expansion coefficient (for nonlinear temperature
curves), to calculate the temperature-compensated density functions.
User input: 5-digit floating-point number, including unit and sign
Factory setting: 0.0000 e-6 [1/K
2
]
REFERENCE
TEMPERATURE
MODBUS register:
Data type:
Access:
7009
2220
Float
read/write
! Note!
Function only available if OFF, °BRIX or FLEXIBLE was not selected in the
function DENSITY FUNCTION (7000).
For entering the reference temperature for the density functions.
User input: 4-digit fixed-point number, including unit and sign
Factory setting: 20 °C
MODE
MODBUS register:
Data type:
Access:
7021
2226
Integer
read/write
! Note!
Function is not available unless the FLEXIBLE setting was selected in the
DENSITY FUNCTION function (7000).
Use this function to select a user-specific method of calculating the concentration
of the density and temperature measured.
In order to use this function, the following values are required:
• Concentration (see formula)
• Currently measured density
• Currently measured temperature
The concentration is calculated from the density and temperature as follows:
K = A0 + A1 · ρ + A2 · ρ
2
+ A3 · ρ
3
+ A4 · ρ
4
+ B1 · T + B2 · T
2
+ B3 · T
3
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
User input:
0 = % MASS 3D
1 = % VOLUME 3D
2 = % MASS 2D
3 = % VOLUME 2D
Factory setting: % MASS 3D
! Note!
If the relation between concentration density and temperature is given as table,
the equation coefficients can be determined by Endress+Hauser e.g. via a coeffi-
cient calculation program and transmitted to the measuring device.
Function description
SPECIAL FUNCTION → DENSITY FUNCTIONS → CONFIGURATION