Proline Promass 83 FOUNDATION Fieldbus
6 Commissioning
Hauser
53
6.2.3
Density adjustment
It is always advisable to perform density adjustment when optimum measuring accuracy is required
for calculating density dependent values.
1-point density adjustment (with one fluid):
This type of density adjustment is necessary under the following circumstances:
• The sensor does not measure exactly the density value that the user expects on the basis of labo-
ratory 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.
Example: Measuring Brix density of apple juice.
Performing 1-point density adjustment (using a FF configuration program
)
"
Caution!
• 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.
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 equalised. The
time you have to wait for equalisation depends on the fluid and the temperature level.
3.
Open the configuration program and then the Resource Block.
4.
Use the WRITE_LOCK parameter to check whether hardware write protection is deactivated:
– Write protection activated = LOCKED
– Write protection deactivated = NOT LOCKED
Deactivate the write protection if necessary
→
5.
Open the Transducer Block.
6.
Enable the programming mode:
– Enter the enable code in the “Un-/Locking - Access Code” parameter
(default = 83).
– The “UN/Locking - Access Status” parameter should now display “Unlocked Customer”.
7.
In the “Density Adjustment - Set Value” parameter, enter the target density value (input range
= current density value ±10%). Send this value to the field device.
8.
In the “Density Adjustment - Measure Fluid” parameter, select “START” and send this setting
to the field device. Promass measures the current density of the fluid (measured density value)
for ten seconds.
9.
In the “Density Adjustment” parameter, select “START”.
Start the density adjustment procedure by sending this setting to the field device. Promass
compares the measured density value and the target density value of the fluid and calculates
the new density coefficient.
10. If density adjustment does not complete correctly, you can select the “Density Adjustment -
Restore Original” parameter to reactivate the default density coefficients.
11. Close the configuration program.
Summary of Contents for Proline Promass 83
Page 24: ...3 Installation Proline Promass 83 FOUNDATION Fieldbus 24 Endress Hauser ...
Page 34: ...4 Wiring Proline Promass 83 FOUNDATION Fieldbus 34 Endress Hauser ...
Page 64: ...6 Commissioning Proline Promass 83 FOUNDATION Fieldbus 64 Endress Hauser ...
Page 66: ...7 Maintenance Proline Promass 83 FOUNDATION Fieldbus 66 Endress Hauser ...
Page 90: ...9 Trouble shooting Proline Promass 83 FOUNDATION Fieldbus 90 Endress Hauser ...
Page 116: ...Index Proline Promass 83 FOUNDATION Fieldbus 116 Endress Hauser ...
Page 118: ...www endress com worldwide BA065D 06 en 12 04 50098623 FM SGML 6 0 ...
