Level measurement (ToF Tool) Cerabar S/Deltabar S
78 Endress+Hauser
8.2.2 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 4 m. 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 BA301P Deltabar S or Operating Instructions BA302P Cerabar S,
Section 6.6 "Level measurement".
• For a description of the parameters mentioned, see
– Page 98, ToF Tool, table 4: POSITION ADJUSTMENT
– Page 101, ToF Tool, table 6: BASIC SETUP
– Page 105, ToF Tool, table 7: BASIC SETUP – "Linear" level type.
• For a description of further relevant parameters, see
– Page 129, ToF Tool, table 12: EXTENDED SETUP
– Page 143, ToF Tool, table 22: PROCESS VALUES.
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
BA301P, Section 6.6.1
P01-PMP75xxx-19-xx-xx-xx-003
Fig. 11: Calibration without reference pressure –
dry calibration
1 See table, step 9.
2 See table, step 10.
3 See table, step 11.
4 See table, step 12.
2 Carry out position adjustment if necessary. See Page 98,
ToF Tool, table 4: POSITION ADJUSTMENT.
3 Select the "Level" measuring mode via the MEASURING
MODE parameter.
Menu path: OPERATING MENU → SETTINGS →
BASIC SETUP → MEASURING MODE
4 Select a pressure unit via the PRESS. ENG. UNIT
parameter, here mbar for example.
5 Select the "Linear" option by means of the LEVEL MODE
parameter.
6 Select the "Volume" option by means of the LIN.
MEASURAND parameter.
7 Select a volume unit via the UNIT VOLUME parameter,
here m
3
for example.
8 Select the "Dry" option by means of the CALIBRATION
MODE parameter. See also the following note, point 3.
9 Enter the value for density via the ADJUST DENSITY
parameter, here 1 kg/dm
3
for example.
10 Enter the tank volume via the TANK VOLUME
parameter, here 5 m
3
for example.
11 Enter the tank height via the TANK HEIGHT parameter,
here 4 m for example.
12 Enter the level offset via the ZERO POSITION
parameter, here –0.5 m for example.
13 If necessary, use the Analog Input Block to configure the
CHANNEL parameter (→ Page 67), L_TYPE parameter
(→ Page 69), XD_SCALE parameter (→ Page 73) and
OUT_SCALE parameter (→ Page 71).
14 Result:
The device is ready for level measurement
4 m
–0.5 m
➂
➃
➁
ρ = 1
kg
dm
3
V = 5 m
3
➀
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