Siemens OCM III Instruction Manual page 56

SIMPLE EXPONENTIAL DEVICES, P3 = 0
TYPICAL LEOPOLD LAGCO
converging
point of measurement
For rated flows under free flow conditions, the head is measured at a point upstream
referenced to the beginning of the converging section. Refer to the following table.
Flume Size
(pipe dia. in inches)
* The transducer must be above the maximum head by at least the
blanking value, P47.
7ML19985AB01
throat
Q
plan
diverging
side
4 - 12
15
18
21
24
30
36
42
48
54
60
66
72
OCM III
Point of Measurement
mm inches
25
32
38
44
51
64
76
89
102
114
127
140
152
transducer *
0
head
front
1.0
1.3
1.5
1.8
2.1
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
57