Cerabar M, Deltabar M, Deltapilot M Commissioning with an operating menu (onsite display/FieldCare)
Endress+Hauser 77
8.4.4 "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 gal) corresponds to a pressure of 450 mbar (6.53 psi). The minimum
volume of 0 liters corresponds to a pressure of 50 mbar (0.72 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.
• The values entered for "Empty calib. (028)/Full calib. (031)", "Empty pressure (029)/Full
pressure (032)" 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
so that the measuring device can 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 73, "Pos. zero adjust".
Description
1 Select the "Level" measuring mode via the
"Measuring mode (005)" parameter.
Menu path: Setup Measuring mode (005)
A0030030
Fig. 30: Calibration without reference pressure –
dry calibration
A See Table, Step 7.
C See Table, Step 8.
B See Table, Step 9.
D See Table, Step 10.
2 Select a pressure unit by means of the "Press. eng.
unit (125)" parameter, here "mbar" for example.
Menu path: Setup Press. eng. unit (125)
3 Select the "In pressure" level mode by means of the
"Level selection (024)" parameter.
Menu path: Setup Extended Setup Level
Level selection (024)
4 Select a volume unit by means of the "Unit before lin.
(025)" parameter, here "l" (liter) for example.
Menu path: Setup Extended Setup Level
Unit before lin. (025)
B
1000 l
450 mbar
A
0 l
50 mbar
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