Page 102 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS A5E33329501
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General Operation
Leopold Lagco Flume
Application information
• Designed to be installed directly into pipelines and manholes
• Leopold Lagco may be classed as a rectangular Palmer-Bowlus flume
• Sized by pipe (sewer) diameter
• 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:
Parameter Value
2.15.1. Primary Measuring Device (PMD)
Exponential Devices
2.15.3.2. Flow Exponent
1.547
a
a.
Typical Flow Exponent for Leopold Lagco Flume; consult your flume documen-
tation.
2.15.3.3. Maximum Head
2.15.3.4. Maximum Flow at 20 mA
2.15.3.5. Zero Head Offset
2.15.3.7. Flowrate Units
2.15.4.1. K Factor
b
b.
Required for exponential device absolute calculation only.
Flume Size
(pipe diameter in inches)
Point of Measurement
cm inches
4-12 2.5 1
15 3.2 1.25
18 4.4 1.75
21 5.1 2
point of measurement
diverging
converging
Front View
Zero
Head
Plan View
Side View
transducer*
throat
flow
* The transducer must be above the maximum head by at least the blanking value (see
2.2.4. Near
Range
).
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