Cerabar S/Deltabar S/Deltapilot S FOUNDATION Fieldbus Level measurement (FF configuration program)
Endress+Hauser 25
5.4.2 Calibration without reference pressure – dry calibration
Example:
In this example, the volume in a tank should be measured in m
3
. The maximum volume is 5 m
3
and the maximum height is 4 m (13 ft). The density of the fluid is 1 kg/dm
3
. 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 tank volume, tank height and density of the fluid are
known.
!
Note!
• See also Operating Instructions BA00301P for Deltabar S or Operating Instructions BA00302P for
Cerabar S or Operating Instructions BA00372P for Deltapilot S, "Level measurement" section.
• For a description of the parameters mentioned, see
– → ä 53, Pressure Transducer Block
– → ä 93, Analog Input Block.
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-PMP75xxx-19-xx-xx-xx-003
Fig. 10: Calibration without reference pressure –
dry calibration
1 See Table, Step 11.
2 See Table, Step 12.
3 See Table, Step 13.
4 See Table, Step 14
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).
4 Select the measuring mode if necessary:
• Select the "No linearization" option by means of the
Linearization/LINEARIZATION parameter.
• By means of the Primary Value Type/
PRIMARY_VALUE_TYPE parameter, select the
"Volume" option.
5 Select the "LEVEL standard" option by means of the
Level Selection/LEVEL_SELECTION parameter.
6 Select a pressure unit via the Calibration Units/
CAL_UNIT parameter, here mbar for example.
7 By means of the Level Mode/LEVEL_MODE parameter,
select the "Linear" option.
8 By means of the Lin. Measurand/LINEAR_
MEASURAND parameter, select the "Volume" option.
9 Select a volume unit via the Unit Volume/
VOLUME_UNIT parameter, here m
3
for example.
10 By means of the Calibration Mode/
CALIBRATION_MODE parameter, select the "Dry"
option.
4 m
–0.5 m
➂
➃
➁
r = 1
kg
dm
3
V = 5 m
3
➀
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