Commissioning Cerabar M, Deltabar M, Deltapilot M / 4...20 mA HART
60 Endress+Hauser
6.5.4 "In pressure" level selection
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 (6.75 psi). The minimum volume of
0 liters corresponds to a pressure of 50 mbar (0.75 psi) since the device is mounted below the start
of the level measuring range.
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!
• The values entered for "Empty calib./Full calib.", "Empty pressure/Full pressure" and "Set LRV/
Set URV" must be at least 1% apart. The value will be rejected, and a warning message displayed,
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 for the measuring device to be able to
measure correctly.
• Due to the orientation of the device, there may be pressure shifts in the measured value, i.e. when
the container is empty or partly filled, the measured value is not zero. For information on how to
perform position adjustment, see ä 56, "Position zero adjustment".
Description
1 Select the "Level" measuring mode via the "Measuring
mode" parameter.
Menu path: Setup Measuring mode
P01-Mxxxxxxx-19-xx-xx-xx-004
Fig. 29: Calibration without reference pressure –
dry calibration
1 See Table, Steps 6 and 7.
2 See Table, Steps 8 and 9.
2 Select the "In pressure" level mode via the "Level
selection" parameter.
Menu path: Setup Extended setup Level Level
selection
3 Select a pressure unit via the "Press eng. unit" parameter,
here "mbar" for example.
Menu path: Setup Press. eng. unit
4 Select a level unit via the "Output unit" parameter, here
"l" (liters) for example.
Menu path: Setup Extended setup Level
Output unit
1000 l
50 mbar
450 mbar
0 l
r = 1
g
cm
3
1
2
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