Endress+Hauser cerabar S - Page 12

Level measurement (FF configuration program) Cerabar S/Deltabar S
12 Endress+Hauser
3. Once you have selected the "Pressure linearized" level type (LEVEL_TYPE), the warning
message "W710 Set span too small. Not allowed." can appear. At this stage the linearisation
table already consists of two points as standard. It could be the case that the 2nd value, and
thus the highest X-value of the linearisation table, is smaller than the minimum span permitted
(→ CAL_MIN_SPAN, Page 34). The message goes out as soon as the highest X-value is larger
than the minimum span and the table entered is active.
4. Once you have entered the maximum tank contents to be expected for SCALE_OUT, EU_100
element, the alarm "A719 Y-Val of lin. table out of edit limits" can appear. At this stage the
linearisation table already consists of two points as standard. It could be the case that the 2nd
value, and thus the highest Y-value of the linearisation table, is larger than the value entered
for SCALE_OUT, EU_100 element. The message goes out as soon as no Y-value is larger than
the value for SCALE_OUT, EU_100 element and the table entered is active.
4.3.2 Manual entry of the linearisation table
Example:
In this example, the volume in a tank with a conical outlet should be measured in m
3
.
Prerequisite:
• This is a theoretical calibration, i.e. the points for the linearisation table are known.
!
Note!
• See also Operating Instructions BA301P Deltabar S or Operating Instructions BA302P Cerabar S,
Section 6.6 "Level measurement".
• For a description of the parameters mentioned, see
– Page 33, Pressure Transducer Block.
– Page 65, Analog Input Block.
Description
1 Perform calibration as per Section 4.3.1, Steps 1 to 10.
P01-PMP75xxx-19-xx-xx-xx-002
Carry out linearisation:
2 Select SCALE_OUT parameter, EU_0 element.
Specify the minimum tank contents to be expected, here
0 m
3
for example.
3Select SCALE_OUT parameter, EU_100 element.
Specify the maximum tank contents to be expected, here
3.5 m
3
for example. See also the following note, point 3.
4 Select the "Manual" option by means of the
LINEARIZATION_TABLE_MODE/LIN. EDIT MODE
parameter.
5 Select the "Edit table" option by means of the
TAB_OBCODE/TABLE SELECTION parameter.
3.5
0
0 350
V
[m ]
3
p
[mbar]