Level measurement (via local operation and FieldCare) Cerabar S/Deltabar S/Deltapilot S FOUNDATION Fieldbus
112 Endress+Hauser
9.3.2 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 level of 4.5 m (15 ft). The minimum volume of 0 liters
corresponds to a level of 0.5 m (1.6 ft) since 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 (BA00301P) or Cerabar S (BA00302P), "Level
measurement" section or Deltapilot S (BA00372P), "Level measurement" section.
• The values entered for EMPTY CALIB./FULL CALIB., EMPTY PRESSURE/FULL PRESSURE and
EMPTY HEIGHT/FULL HEIGHT must be at least 1% apart 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, 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 150, Table 9: OPERATING MENU → SETTINGS → BASIC SETUP "Level", LEVEL
SELECTION "Level easy height".
• 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-009
Fig. 25: Calibration without reference pressure –
dry calibration
1 See Table, Step 11.
2 See Table, Steps 13 and 14.
3 See Table, Steps 15 and 16.
2 If necessary, select the "Level easy height" 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
0.5 m
4.5 m
0l
r =1
kg
dm
3
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