Endress+Hauser RIA452 Betriebsanleitung Seite 95

RIA452
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Dec. Y value
Del. points
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6.3.9 Linearization table - LIN. TABLE/M21
To linearize input variables, a linearization table can be saved in the measuring instrument, e.g. to
correct the level signal of a container for volume display.
Parameter setting
2..32
2
XXXXXXXXX
XXXXX
XXXX.X
XXX.XX
XX.XXX
X.XXXX
No
Yes
No
Yes
Tank linearization
Example:
Fig. 23: Example for tank linearization
You want to determine the amount of cereal filled into a silo, display this information on site and
transfer it to a process control system. A 4-20 mA level sensor determines the level in the container,
the connection between the level (m) and volume (m
sensor current. The volume calculated is output as a 0-20 mA signal at the analog output in propor-
tion to the volume. In the event of a fault in the system, the analog output outputs an error signal
of 21.0 mA.
• Container empty:
– Sensor signal 4 mA
– Level 0 m
– Numeric display should show 0 (m
– Bar graph should show 0%
– 0 mA should be present at the analog output
• Container full:
– Sensor signal 20 mA
– Level 10 m
Description
Number of support points needed. At least two points have to be entered.
Select the dimension from the list or dimension as free text (max. 9 characters
long).
Decimal point position for the Y-values in the linearization table.
Delete all programmed support points.
Show all programmed support cells.
3
) is known and the level is proportional to the
3
)
Commissioning
95