Cerabar S/Deltabar S/Deltapilot S FOUNDATION Fieldbus Level measurement (FF configuration program)
Endress+Hauser 17
5.2.2 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 (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 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. Level Easy/EMPTY_CALIBRATION_EASY and Full Calib.
Level Easy/FULL_ CALIBRATION_EASY 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, see also → ä 59,
"Pos. Zero Adjust/ZERO_POSITION_ ADJUST".
Description
1 Deltabar S: Before configuring the device for your
application, the pressure piping must be cleaned and the
device filled with fluid. See Operating Instructions
BA00301P.
P01-PMC71xxx-19-xx-xx-xx-008
Fig. 3: Calibration without reference pressure –
dry calibration
1 See Table, Step 10.
2 See Table, Step 9.
2 Open the Pressure Transducer Block and set the block
mode to OOS.
3 The following options are available for performing
position adjustment:
• By means of the parameters
– Pos.Zero Adjust/ZERO_POSITION_ADJUST
(→ ä 59) or
– Pos. Input Value/POSITION_INPUT_VALUE
(→ ä 59) or
– Calib. Offset/CALIBRATION_OFFSET (→ ä 59).
1000 l
50 mbar
➁
0l
➀
450 mbar
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