Endress+Hauser cerabar S - Level Measurement (Tof Tool); Overview of Level Measurement

Cerabar S/Deltabar S Level measurement (ToF Tool)
Endress+Hauser 75
8 Level measurement (ToF Tool)
8.1 Overview of level measurement
Measuring task Measured variable
selection
LEVEL MODE Description Measured value display
The measured variable is in direct
proportion to the measured
pressure.
– % (level)
– Level
–Volume
–Mass
Linear – Calibration with reference
pressure – wet calibration, see
Page 76, Section 8.2.1
– Calibration without reference
pressure – dry calibration, see
Page 78, Section 8.2.2
The measured value display and
the LEVEL BEFORE LIN
parameter display the measured
value.
The measured variable is not in
direct proportion to the measured
pressure as, for example, with
containers with a conical outlet.
A linearisation table must be
entered for the calibration.
– Pressure and %
– Pressure and volume
– Pressure and mass
Pressure linearized – Calibration with reference
pressure: semiautomatic entry
of linearisation table, see
Page 80, Section 8.3.1
– Calibration without reference
pressure: manual entry of
linearisation table, see Page 82,
Section 8.3.2
The measured value display and
the TANK CONTENT parameter
display the measured value.
– Two measured variables are
required or
– The container shape is given
by value pairs, such as height
and volume.
The 1st measured variable
%-height or height must be in
direct proportion to the measured
pressure. The 2nd measured
variable volume, mass or % must
not be in direct proportion to the
measured pressure. A
linearisation table must be
entered for the 2nd measured
variable. The 2nd measured
variable is assigned to the 1st
measured variable by means of
this table.
– Height and volume
– Height and mass
– Height and %
–%-height and volume
–%-height and mass
–%-height and %
Height linearized – Calibration with reference
pressure: wet calibration and
semiautomatic entry of
linearisation table, see Page 84,
Section 8.4.1
– Calibration without reference
pressure: dry calibration and
manual entry of linearisation
table, see Page 87, Section
8.4.2
The measured value display and
the TANK CONTENT parameter
display the 2nd measured value
(volume, mass or %).
The LEVEL BEFORE LIN
parameter displays the 1st
measured value
(%-height or height).