Endress+Hauser RIA452 - Page 39

RIA452 Commissioning
Endress+Hauser 39
Tank linearization
Example:
G09-RIA452ZZ-15-00-xx-xx-011
Fig. 21: 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
3
) is known and the level
is proportional to the sensor current. The volume calculated is output as a 0-20 mA signal at
the analog output in proportion 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
3
)
– Bar graph should show 0%
– 0 mA should be present at the analog output
• Container full:
– Sensor signal 20 mA
– Level 10 m
– Numeric display should show 1500 (m
3
)
– Bar graph should show 100%
– 20 mA should be present at the analog output
The following parameters must be configured for the example above:
Point
1 2 3 4 5 6 7 8 9 10
Sensor
signal
(mA)
X
value
4,0
X
value
4,32
X
value
4,64
X
value
4,96
X
value
5,28
X
value
5,6
X
value
5,92
X
value
6,24
X
value
6,56
X
value
20,0
Display
value
(m
3
)
Y
value
0
Y
value
20
Y
value
50
Y
value
85
Y
value
115
Y
value
160
Y
value
210
Y
value
280
Y
value
400
Y
value
1500
Menu Function (menu item) Setting value
LIN. TABLE / M 21 Counts
Dimension
Show points
Number of support points (10)
Dimension of lin. value (m
3
)
Display support points (Yes)