Siemens SITRANS LUT400 Series - Parshall Flume

A5E33329501 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS Page 101
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General Operation
Parshall Flume
Application information
• Sized by throat width
• Set on solid foundation
• For rated flows under free flow conditions, the head is measured at
2
/
3
the length of
the converging section from the beginning of the throat section
Note: C = Converging Dimension.
Parameter Value
2.15.1. Primary Measuring Device (PMD) Exponential Devices
2.15.3.2. Flow Exponent
1.522–1.607
a
a.
Typical Flow Exponent range for Parshall Flume; consult your flume documen-
tation.
2.15.3.3. Maximum Head
2.15.3.4. Maximum Flow at 20 mA
2.15.4.1. K Factor
b
b.
Required for exponential device absolute calculation only.
Q
C
2
/
3
C
Zero
Head
Front View
Plan View
transducer*
Side View
* The transducer must be above the maximum head by at least the blanking value (see
2.2.4. Near
Range
).
flow