Siemens SITRANS Probe LU Kurzanleitung Seite 72

Head Breakpoints
When measuring flow in an open channel device, you can define the cross-section of the
channel as a series of segments. In P054 you assign a head value to each breakpoint. In
P055 you assign a corresponding flow value to each breakpoint.
Primary Index
Secondary Index
Values
Related Parameters
Enter up to 11 head breakpoints, where the corresponding flow is known. The 100% and
0% levels must be entered. The breakpoints can be ordered from top to bottom, or the
reverse.
1. First set P050 to 9.
2. Select P054.
3. The default breakpoint value appears, with
the breakpoint number in the auxiliary
reading.
4. Press DISPLAY
reading field goes blank).
5. Key in 1 and press ENTER
6. Key in the head value for breakpoint 1, and press ENTER
P005.)
7. Press the UP ARROW key
8. Key in the head value for breakpoint 2, and press ENTER
9. Repeat steps 7 and 8 until head values have been entered for all the required
breakpoints.
10. Press DISPLAY
Example: v-notch weir:
Breakpoints
Note:
Illustrated values for P054 and P055 are for example purposes only.
1.
For more details on secondary index operation, see page 27.
Page 36 SITRANS Probe LU – INSTRUCTION MANUAL
P054
Breakpoint number
Range
Default
P055 Flow Breakpoints
twice to focus control on the secondary index
.
to display 02 in the auxiliary reading.
twice and use the UP ARROW key
Break Head
-point (P054)
4
3
4 0.4 m
2
1
3 0.3 m
2 0.2 m
1 0 m
0.0000 to 99999 in units (P005)
0.000
1
. (Use units defined in
.
to go to P055.
flow characterization
Flow
4
(P055)
113.5
3
55.3
2
20.07
1
1
0
breakpoint
value field
breakpoint
number
(the auxiliary
2 3 4
head
7ML19985HT01