Level measurement (via local operation and FieldCare) Cerabar S/Deltabar S/Deltapilot S FOUNDATION Fieldbus
108 Endress+Hauser
9.2.2 Calibration without reference pressure – dry calibration
Example:
In this example, the volume in a tank should be measured in liters. The maximum volume of
1000 liters (264 US gal) corresponds to a pressure of 450 mbar (7 psi). The minimum volume of 0
liters corresponds to a pressure of 50 mbar (psi) since 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 (BA00301P) or Cerabar S (BA00302P), "Level
measurement" section or Deltapilot S (BA00372P), "Level measurement" section.
• The values entered for EMPTY CALIB. (010) and FULL CALIB. (004) must be at least 1 % apart
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, the MEASURED VALUE parameter does not display zero. → For information
on how to perform position adjustment, → ä 142, Table 6: OPERATING MENU → SETTINGS
→ POSITION ADJUSTMENT.
• For a description of the parameters mentioned, see
– → ä 134, Table 2: GROUP SELECTION → MEASURING MODE
– → ä 146, Table 8: OPERATING MENU → SETTINGS → BASIC SETUP "Level", LEVEL
SELECTION "Level easy pressure"
• For a description of further relevant parameters, see
– → ä 183, Table 16: OPERATING MENU → SETTINGS → EXTENDED SETUP "Level"
– → ä 201, Table 28: OPERATING MENU → PROCESSINFO → PROCESS VALUES "Level".
Description
1 Select the "Level" measuring mode via the MEASURING
MODE parameter.
Local operation:
Menu path: GROUP SELECTION → MEASURING
MODE
FieldCare:
Menu path: OPERATING MENU → SETTINGS →
BASIC SETUP → MEASURING MODE
P01-PMC71xxx-19-xx-xx-xx-008
Fig. 21: Calibration without reference pressure –
dry calibration
1 See Table, Step 10.
2 See Table, Step 11.
3 See Table, Step 12.
4 See Table, Step 13.
2 If necessary, select the "Level easy pressure" level mode
using the LEVEL SELECTION parameter.
Local operation:
Menu path: GROUP SELECTION → MEASURING
MODE "Level" → LEVEL SELECTION
FieldCare:
Menu path: OPERATING MENU → SETTINGS →
BASIC SETUP → MEASURING MODE "Level" →
LEVEL SELECTION
3 Local operation:
Select the BASIC SETUP function group. Menu path:
GROUP SELECTION → OPERATING MENU →
SETTINGS → BASIC SETUP
1000 l
50 mbar
➁
0l
➀
450 mbar
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