Proline Promass 80
Commissioning
Hauser
51
6.5.2
Density adjustment
Measuring accuracy in determining fluid density has a direct effect on calculating volume flow.
Density adjustment, therefore, is necessary under the following circumstances:
• The sensor does not measure exactly the density value that the user expects, based on laboratory
analyses.
• The fluid properties are outside the measuring points set at the factory, or the reference operating
conditions used to calibrate the measuring device.
• The system is used exclusively to measure a fluid’s density which must be registered to a high
degree of accuracy under constant conditions.
Performing a 1-point or 2-point density adjustment
"
Caution!
• Onsite density adjustment can be performed only if the user has detailed knowledge of the fluid
density, obtained for example from detailed laboratory analyses.
• The target density value specified in this way must not deviate from the measured fluid density
by more than ±10%.
• An error in defining the target density affects all calculated density and volume functions.
• Density adjustment changes the factory density calibration values or the calibration values set by
the service technician.
• The functions outlined in the following instructions are described in detail in the "Description of
Device Functions" manual.
1.
Fill the sensor with fluid. Make sure that the measuring tubes are completely filled and that
liquids are free of gas bubbles.
2.
Wait until the temperature difference between fluid and measuring tube has equalized. The
time you have to wait for equalization depends on the fluid and the temperature level.
3.
Select the density adjustment function:
HOME
F
R
PROCESS PARAMETERS
F
DENSITY SET POINT
– When you press
P
you are automatically prompted to enter the access code if the function
matrix is still disabled. Enter the code.
– Use
P
to enter the fluid's target density and press
F
to save this value (input range = actual
density value ±10%).
4.
Press
F
to select the MEASURE FLUID function.
Use
P
to select the setting START and press
F
. The message DENSITY ADJUST RUNNING
then appears on the display for 10 seconds. During this time Promass measures the current
density of the fluid (measured density value).
5.
Press F and select the DENSITY ADJUST function.
Now use
P
to select the setting DENSITY ADJUST and press
F
. Promass compares the
measured density value with the specified value and calculates the new density coefficient.
"
Caution!
If a density adjustment does not complete correctly, you can select the RESTORE ORIGINAL
function to reactivate the default density coefficient.
6.
Use
Q
Use Q to return to the HOME position (press
P
simultaneously).
