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IM-P-20200627-01
6.11.7 Free Linearization
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Free Linearization in Process
1.
Navigate to program point
P111 – TANK LIN
, and push to confirm.
2.
Navigate to
Free lin.
with the navigation button, and push to confirm.
3.
Two choices appear on the screen:
Measured
and
Manual
4.
Select
Measured
to configure a free linearization in a process situation.
5.
Two choices appear on the screen:
Input
and
Simulate
6.
Select
Input
, and push to confirm
7.
Five choices appear on the screen:
DISPLAY
EXPLANATION
Clear table
The previous entered values for linearization will be deleted. It is advisable to use this feature for
each time a new linearization is configured.
CAUTION
•
All entered values and dimensions of an existing / previous linearization will be erased.
Volume units
Select the preferred unit: Liters, Hectoliters, Kg and Tons (after linearization the unit can be changed
and selected in
P109
)
Height
The height of the tank can be filled in (highly recommended for an accurate linearization). The
transmitter will determine with this height the span. A linearization will be made with the smallest
possible deviation. Factory setting = Saved span in
P102
.
Start Point
The filling of a tank can be measured up to 70 points. The transmitter must be installed in an actual
process to accomplish these measurements. The measuring must take place from low to high.
(Filling an empty tank). The actual measuring will be displayed on the screen in percentage (%) for
Xn
(filling) and for
Yn
the measured volume. To enter the next measured point move the navigation
button up and enter the values.
Save
When all desired measurements are completed and all parameters have been set, the linearization
must be saved. Push the navigate button to the left and select
SAVE
SAVE
to save the linearization. The
transmitter will return to the main menu.
CAUTION
•
When a tank filling (
Xn
) does not reach 100% of the height of the tank, the transmitter will calculate the
remaining part. This calculating method is linear and will only be used for the remaining part up to 100%.
Linearized Filling
Linear calculation up to 100%
•
It is not advisable to manually adjust the SPAN in program point P102 after a linearization has been
configured. If the SPAN is adjusted after a linearization configuration, a warning will appear on the screen
when entering P102.
•
When the a free linearization is used for measuring weight (Kg and Tons), a reliable accuracy cannot be
guaranteed due to external influences such as heat and tank wall expansion.
The change of Specific
Gravity due to different temperatures cannot be compensated by the pressure transmitter.
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Simulation
After linearization is entered and saved, it is possible to perform a simulation. (Based on the saved linearization)
The transmitter will convert the entered mWc to hectoliters.
