KRAL BEM 100 - Entering the Density Table

9 Operation
9.1 Carrying out the basic settings
Entering density values manually
Density values and temperature values can be entered manually.
Set the parameter "Density_Determination" to 0, 1 or 2 and enter density values.
Having density values calculated
In the case of fuel oils the temperature-dependent density values can be calculated automatically from
a reference value. The density calculation is implemented in accordance with PTB and DIN 51757 Pro-
cessB for fuel oils.
Set the parameter "Density_Determination" to3,4 or5.
ð The processing unit calculates the density values by using the reference values:
Density table1 with parameter "Reference_Density_1"
Density table2 with parameter "Reference_Density_2"
Note After a changeover to calculated density values the processing unit has to be restarted.
Having a density table selected
In the case of operation with two different pumped liquids, for example diesel and heavy fuel oil, the se-
lection of the associated density table can be carried out automatically. To this purpose the current
temperature of the pumped liquid is compared with the value of the parameter "Temperature_Switch".
For automatic selection of the density table set the parameter "Density_Determination" to0 or3.
ð The processing unit compares the currently measured temperature of the pumped liquid with the
parameter "Temperature_Switch" and selects the density table:
Selection of Density table1 if the temperature is lower than "Temperature_Switch"
Selection of Density table2 if the temperature is higher than or equal to "Temperature_Switch"
Selecting Density table 1
To select Density table 1 set the parameter "Density_Determination" to 1 or 4.
Selecting Density table 2
To select Density table 2 set the parameter "Density_Determination" to 2 or 5.
9.1.3 Entering the density table
The processing unit manages two density tables for two different pumped liquids. The temperature-de-
pendent density values of a pumped liquid are stored in a density table. The calculation of the flow rate
at a reference temperature is carried out with the stored values.
If the plant is operated with only one pumped liquid, only one density table is used.
Address Parameter Unit Length Number of
decimal
places
Explanation Data type
0x60 ...
0x69
Temperature 1.1 ...
Temperature 1.10
[°C] 1 1 Value x 10 I16
0x6A ...
0x7C
Density 1.1 ...
Density 1.10
[kg/m
3
] 2 1 Value x 10 U32
Tab.22: Parameters of Density table 1
1. Enter the value times10 in the parameters "Temperature1.1" to "Temperature1.10".
Example: Entry125 means12.5°C.
2. Enter the value times10 in the parameters "Density 1.1" to "Density 1.10".
Example: Entry8513 means851.3kg/m
3
.
Operating instructions
OIE 26en-GB Edition 2021-08
17