Endress+Hauser cerabar S PMC Series - Page 37

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 %
Level
V
Empty
V
Full
Volume
Table giving example
Point Measured
value
(mbar)
Level
(%)
Volume
(%)
1000
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
Endress+Hauser 37