Parshall Flume - Siemens SITRANS L 7ML5400 Operating Instructions Manual

General Operation
7.11 Open Channel Monitoring (OCM)
7.11.4.3

Parshall Flume

Note
C = Converging Dimension.
① Zero head
② Converging dimension C
③ 2/3 C
④ Flow
⑤ Transducer*
* The transducer must be above the maximum head by at least the blanking value (see Near
Range (2.2.4.) (Page 176)).
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
Parameter
Primary Measuring Device (PMD) (2.15.1.) (Page 234)
Flow Exponent (2.15.3.2.) (Page 236)
Maximum Head (2.15.3.3.) (Page 237)
Maximum Flow at 20 mA (2.15.3.4.) (Page 237)
K Factor (2.15.4.1.) (Page 240)
Typical Flow Exponent range for Parshall Flume; consult your flume documentation.
a
Required for exponential device absolute calculation only.
b
128
converging section from the beginning of the throat section.
b
Value
Exponential Devices
1.522–1.607
a
Operating Instructions, 04/2021, A5E33329501-AG
SITRANS LUT400