Commissioning Cerabar M, Deltabar M, Deltapilot M / 4...20 mA HART
86 Endress+Hauser
6.11.5 Level selection "in pressure"
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 400 mbar (6 psi). The minimum volume of 0
liters corresponds to a pressure of 0 mbar.
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." and" Set LRV/Set URV" must be at least 1% apart.
The value will be rejected, and a message output, if the values are too close together. Other limit
values are not checked, i.e. the values entered must be appropriate for the sensor and the measuring
task for the device to be able to measure correctly.
Description
1 Perform "position zero adjustment" ä 56.
2 Select the "Level" measuring mode via the "Measuring
mode (005)" parameter ( ä 55).
Menu path: Setup Measuring mode
3 Select a pressure unit via the "Press eng. unit" parameter
( ä 55), here "mbar" for example.
Menu path: Setup Press. eng. unit
4 Select the "In pressure" level mode via the "Level
selection" parameter ( ä 114).
Menu path: Setup Extended setup Level
Level selection
5 Select a level unit via the "Output unit" parameter
( ä 114), here "l" for example.
Menu path: Setup Extended setup Level
Output unit
6 Select the "Dry" option via the "Calibration mode"
parameter ( ä 114).
Menu path: Setup Extended setup Level
Calibration mode
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