Level measurement
Cerabar S/Deltabar S/Deltapilot S 4...20mA HART
22
Hauser
5.3.2
Calibration without reference pressure – dry calibration
Example:
In this example, the volume in a tank should be measured in litres. The maximum volume is 1000
l (264 US gal), and the maximum height is 4.5 m (15 ft). The minimum volume of 0 litres
corresponds to a level of 0.5 m (1.6 ft), as the device is mounted below the level lower range value.
The density of the fluid is 1 kg/dm
3
.
Prerequisite:
• The measured variable is in direct proportion to the pressure.
• This is a theoretical calibration i.e. the height and volume values for the lower and upper
calibration point must be known.
!
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".
• The values entered for EMPTY CALIB./FULL CALIB., EMPTY PRESSURE/FULL PRESSURE,
EMPTY HEIGHT/FULL HEIGHT and SET LRV/SET URV must have a minimum interval of 1%
for the "Level Easy Height" level mode. The value will be rejected with a warning message if the
values are too close together. Further limit values are not checked; i.e. the values entered must
be appropriate for the sensor and the measuring task so that the measuring device can measure
correctly.
• Due to the orientation of the device, there may be a shift in the measured value, i.e. when the
container is empty or partly filled, the MEASURED VALUE parameter does not display zero.
To perform a position adjustment see also Page , Table 6: Position adjustment.
• For a description of the parameters mentioned, see
– Page 45, Table 2: MEASURING MODE
– Page 62, Table 9: LEVEL SELECTION "Level Easy Height"
• 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
Select the "Level" measuring mode via the MEASURING
MODE parameter.
On-site display:
Menu path: GROUP SELECTION
MEASURING
MODE
Digital communication:
Menu path: OPERATING MENU
SETTINGS
BASIC SETUP
MEASURING MODE
P01-PMC71xxx-19-xx-xx-xx-007
Fig. 9:
Calibration without reference pressure –
dry calibration
1
See Table, Steps 8 and 9.
2
See Table, Steps 10 and 11.
3
See Table, Steps 12 and 13.
2
If necessary, select "Level Easy Height" level mode using
the LEVEL SELECTION parameter.
On-site display:
Menu path: GROUP SELECTION
MEASURING
MODE "Level"
LEVEL SELECTION
Digital communication:
Menu path: OPERATING MENU
SETTINGS
BASIC SETUP
MEASURING MODE "Level"
LEVEL SELECTION
3
On-site display:
Select BASIC SETUP function group. Menu path:
GROUP SELECTION
OPERATING MENU
SETTINGS
BASIC SETUP
1000 l
0,5 m
4,5 m
0 l
ρ
= 1
kg
dm
3
1
3
2