Cerabar S/Deltabar S/Deltapilot S 4...20mA HART
Level measurement
Hauser
31
3.
Once you have selected the "Pressure Linearized" 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-VAL.
of the linearisation table, is smaller than the minimum span permitted (
MINIMUM SPAN,
Page 119). The message goes out as soon as the highest X-VAL. is larger than the minimum
span.
4.
A level value is assigned to both the lower and upper current value with the SET LRV
(
Page 98) and SET URV (
Page 98) parameters. If you enter values for TANK CONTENT
MIN (
Page 101 or 104) and TANK CONTENT MAX (
Page 101 or 105), the SET LRV
and SET URV parameters are also changed. If you want to assign values other than those for
TANK CONTENT MIN and TANK CONTENT MAX to the lower and upper current values,
the desired values must be entered for SET LRV and SET URV.
5.5.2
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.
• A minimum gap of 0.5 % of the distance between two points must be maintained. Spans for the
"Pressure linearized" option: HYDR. PRESS MAX. – HYDR. PRESS MIN.; TANK CONTENT
MAX. – TANK CONTENT MIN. Spans for the "Height linearized" option: LEVEL MAX – LEVEL
MIN; TANK CONTENT MAX. – TANK CONTENT MIN.
!
Note!
• See also Operating Instructions for Deltabar S (BA00270P) or Cerabar S (BA00271P), Section 6.5
"Level measurement" or Deltapilot S (BA00332P), Section 6.4 "Level measurement".
• For a description of the parameters mentioned, see
– Page 45, Table 2: MEASURING MODE
– Page 53, Table 6: POSITION ADJUSTMENT
– Page 67, Table 10: BASIC SETUP
– Page 78, Table 12: BASIC SETUP – "Pressure Linearized" level type
– Page 100, Table 18: LINEARISATION – on-site operation
– Page 104, Table 19: LINEARISATION – Digital communication.
• For a description of further relevant parameters, see
– Page 96, Table 16: EXTENDED SETUP
– Page 122, Table 28: PROCESS VALUES.
#
Warning!
If the measuring mode is changed, the span setting (URV) must be verified in the "Calibration"
"Basic Setup" operating menu and, if necessary, reconfigured.
Description
1
Perform basic setup as per Section 5.3.1, steps 2 to 10.
P01-PMP75xxx-19-xx-xx-xx-002
Carry out linearisation:
2
Change the function group:
Menu path: (GROUP SELECTION
) OPERATING
MENU
SETTINGS
LINEARISATION
3
Select TANK CONTENT MIN parameter .
Specify the minimum tank contents to be expected, here
0 m
3
for example.
4
Select TANK CONTENT MAX parameter .
Specify the maximum tank contents to be expected, here
3.5 m
3
for example.
3.5
0
0
350
V
[m ]
3
p
[mbar]