Siemens SITRANS LUT400 - Page 147

General Operation
7.11 Open Channel Monitoring (OCM)
SITRANS LUT400
Operating Instructions, 07/2019, A5E33329501-AC
145
Palmer Bowlus Flume
①
Flow
②
Transducer
The transducer must be above the maximum head by at least the blanking value. See
Near
Range (2.2.4.) (Page 172).
③
Zero head
④
D
⑤
D/2, point of measurement for rated flows under free flow conditions.
Parameter
Value
Primary Measuring Device (PMD) (2.15.1.) (Page 230)
Palmer Bowlus Flume
PMD Dimensions (2.15.4.) (Page 234)
Maximum Flume width h
max
Maximum Head (2.15.3.3.) (Page 232)
Maximum Flow at 20 mA (2.15.3.4.) (Page 232)
Zero Head Offset (2.15.3.5.) (Page 233)
Flowrate Units (2.15.3.7.) (Page 233)
Method of Flow Calculation (2.15.3.1.) (Page 231)
Ratiometric
Note
Palmer Bowlus Flume can only be set up using ratiometric calculations.
Application information
● Sized by pipe diameter D.
● Flume relief is trapezoidal.
● Designed to install directly into pipelines and manholes.