Cerabar S/Deltabar S/Deltapilot S 4...20mA HART
Level measurement
Hauser
17
5.2.2
Calibration without reference pressure – dry calibration
Example:
In this example, the volume in a tank should be measured in litres.The maximum volume of 1000
litres (264 US gal) corresponds to a pressure of 450 mbar (6.75 psi). The minimum volume of 0
litres corresponds to a pressure of 50 mbar (0.75 psi), as the device is mounted below the level lower
range value. The device is mounted below the level lower range value.
Prerequisite:
• The measured variable is in direct proportion to the pressure.
• This is a theoretical calibration i.e. the pressure 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. and SET LRV/SET URV must have a
minimum interval of 1% for the "Level Easy Pressure" 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 53, Table 6: Position adjustment.
• For a description of the parameters mentioned, see
– Page 45, Table 2: MEASURING MODE
– Page 58, Table 8: LEVEL SELECTION "Level Easy Pressure"
• 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-000
Fig. 5:
Calibration without reference pressure –
dry calibration
1
See Table, Steps 7 and 8.
2
See Table, Steps 9 and 10.
2
If necessary, select "Level Easy Pressure" 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
50 mbar
450 mba
0 l
ρ
= 1
kg
dm
3
1
2