Siemens SITRANS LUT400 - Parshall Flume

General Operation
7.11 Open Channel Monitoring (OCM)
SITRANS LUT400
126 Operating Instructions, 07/2019, A5E33329501-AC
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 172)).
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.
Parameter
Value
Primary Measuring Device (PMD) (2.15.1.) (Page 230)
Exponential Devices
Flow Exponent (2.15.3.2.) (Page 231)
1.522–1.607
a
Maximum Head (2.15.3.3.) (Page 232)
Maximum Flow at 20 mA (2.15.3.4.) (Page 232)
K Factor (2.15.4.1.) (Page 235)
b
a
Typical Flow Exponent range for Parshall Flume; consult your flume documentation.