Endress+Hauser cerabar S PMC Series - Page 38

Semi-automatic
entry
Requirements for semi-automatic entry of
the linearisation curve are as follows:
•
The vessel can be filled for e.g. empty/full
calibration and for linearisation can be
emptied as described below. The level is
automatically determined from the
hydrostatic pressure. The appropriate
volumeisgivenin%.
•
The measured value is supplied as a
volume.
Note!
•
For step 1, you can also carry out a
zero correction according to the
procedure described in Chapter 5.1,
page 27.
•
A dry calibration can also be made
using steps 1-3, see page 34.
•
In edit mode V3H6 = Manual, you can
delete individual points in a linearisation
table entering "9999" for level or
volume. But first activate the
linearisation table.
Entering the pairs of values for the
linearisation curve is done after a
calibration with reference pressure or a dry
calibration in %. The procedure with
reference pressure is then carried out as
described below.
# Matrix Path through the
menus
Entry
Fill the vessel to the zero point
1 Set the display to "0" by adopting an acting
bias pressure.
V0H6 ➤ Sets bias
pressure
automatically Confirm
2 Adopt the acting pressure for the lower
range-value (empty)
V0H3 ➤ Sets 4 mA
automatically Confirm
Fill the vessel to the end point (full)
3 Adopt the acting pressure for the upper
range-value
V0H4 ➤ Sets 20 mA
automatically Confirm
# Changing product?
see "Density Correction" page 33
Main group: Linearisation
4 Select linearisation mode "semi-automatic
entry"
V3H6 Operation mode
➤ semi-automatic Confirm
5 Enter the table
V3H7 ➤ Line No. 7
Confirm
V3H8 ➤ Input level
Confirm
The actual level is automatically determined
V3H9 ➤ Set volume e.g. 100%
Confirm
Repeat step 5 until all points have been
entered.
6 Activate the table
V3H6 ➤ Activate
table Confirm
7 Select the operation mode "Level manual"
V3H0 ➤ Level
manual Confirm
8 Enter the level or volume at the minimum level
V3H1 ➤ Display at
4 mA
e.g. 0 (hl)
Confirm
9 Enter the level or volume at the maximum level
V3H2 ➤ Display at
20 mA
e.g. 10 (hl)
Confirm
10 Select the level or volume units
(Select unit from the tables on page 32)
V3H3 ➤ Unit after
linearisation
e.g. hl
Confirm
1
4
6
5
3
2
7
BA187Y57
100
0 %
Level
V
Full
Volume
V
Empty
Table giving example
Point Measured
value
(mbar)
Level
(%)
Volume
(%)
1000
2 100 20 8
3 200 40 20
…
7 500 100 100
Note!
volume at x % level =
total volume volume (%)
10 0
•
6 Level Measurement Cerabar S
38 Endress+Hauser