A5E33329501 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS Page 97
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General Operation
Open Channel Monitoring (OCM)
An OCM installation is defined one of three ways, based on the Primary Measuring
Device (PMD):
1. Dimensional
For some common weir and flume types. PMD dimensions (
2.15.4. PMD Dimensions
) are
entered directly.
2. Exponential
For most other weir and flume types. PMD exponents provided by the manufacturer are
entered. Flow is calculated using the exponent (
2.15.3.2. Flow Exponent
) and the
maximum values (
2.15.3.3. Maximum Head
and
2.15.3.4. Maximum Flow at 20 mA
).
3. Universal
For all other PMDs, the head-to-flow curve can be plotted based on known breakpoints,
usually supplied by the PMD manufacturer.
Vessel Type See page:
BS- 3680 Rectangular Flume
105
BS- 3680 Round Nose Horizontal Crest Weir
106
BS- 3680 Trapezoidal Flume
107
BS- 3680 U-Flume
108
BS- 3680 Finite Crest Weir
109
BS- 3680 Thin Plate Rectangular Weir
110
BS- 3680 Thin Plate V-Notch Weir
111
Rectangular Weir Contracted
112
Round Pipe
113
Palmer Bowlus Flume
114
H-Flume
115
Vessel Type See page:
Standard Weirs
116
Parshall Flume
101
Leopold Lagco Flume
102
Cut Throat Flume
103
Vessel Type See page:
Typical flow characterization
116
Example flumes
117
Example weirs
118
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