Open Channel Monitoring (Ocm) - Siemens SITRANS LUT400 Series Operating Instructions Manual

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 (
entered directly.
BS- 3680 Rectangular Flume
BS- 3680 Round Nose Horizontal Crest Weir
BS- 3680 Trapezoidal Flume
BS- 3680 U-Flume
BS- 3680 Finite Crest Weir
BS- 3680 Thin Plate Rectangular Weir
BS- 3680 Thin Plate V-Notch Weir
Rectangular Weir Contracted
Round Pipe
Palmer Bowlus Flume
H-Flume
2. Exponential
For most other weir and flume types. PMD exponents provided by the manufacturer are
entered. Flow is calculated using the exponent (
maximum values (
Standard Weirs
Parshall Flume
Leopold Lagco Flume
Cut Throat Flume
3. Universal
For all other PMDs, the head-to-flow curve can be plotted based on known breakpoints,
usually supplied by the PMD manufacturer.
Typical flow characterization
Example flumes
Example weirs
A5E33329501
Vessel Type
2.15.3.3. Maximum Head
Vessel Type
Vessel Type
SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
2.15.4. PMD Dimensions
See page:
2.15.3.2. Flow Exponent
2. 1 5.3.4. Maximum Flow at 20 mA
and
See page:
See page:
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