Manual entry
Requirements
for manual linearisation are
as follows:
•
The max. 21 pairs of values for the
points on the linearisation curve are
known.
•
The curve is given as a % level
(% pressure span) against % volume.
The linearisation curve must rise or fall
continuously.
•
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 calibration can also be made with a
reference pressure 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 for dry
calibration is described below (see also
page 35).
#
Matrix Path through the
menus
Entry
1
Set the display to "0"
V0H5
➤
Sets
bias pressure
e.g. 0.1 mbar
Confirm
2
Enter the theoretical pressure for the lower
range-value (empty)
V0H1
➤
Sets 4 mA
0 mbar
Confirm
3
Enter the theoretical pressure for the upper
range-value (full)
V0H2
➤
Sets 20 mA
500 mbar
Confirm
#
Changing product?
see "Density Correction" page 33
Main group: Linearisation
4
Select linearisation mode "Manual entry"
V3H6
Operation mode
➤
manual
Confirm
5
Enter the table
V3H7
➤
Line No.
1
Confirm
V3H8
➤
Input level
e.g. 0 %
Confirm
V3H9
➤
Set volume
e.g. 0 %
Confirm
Repeat step 5 until all points have been
entered.
6
Activate the table
V3H6
➤
Activate
table
Confirm
7
Select 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 32)
V3H3
➤
Unit after
linearisation
e.g. hl
Confirm
Note!
1
4
6
5
3
2
7
BA187Y56
100 %
0 %
Le
vel
V
Empty
V
Full
Volume
Table giving example
Point
Measured
value
(mbar)
Level
(%)
Volume
(%)
1
0
0
0
2
100
20
8
3
200
40
20
…
7
500
100
100
volume at x % level =
total volume
volume (%)
10 0
•
Cerabar S
6 Level Measurement
Hauser
37
Содержание Cerabar S PMC 731
Страница 6: ...6 Endress Hauser...
