Flow Application Example - Siemens SITRANS LUT400 Operating Instructions Manual

Flow application example

Parshall Flume
In this example, a 12 inch (0.305 m) Parshall Flume has been installed in an open channel.
As per the supplier's data sheet, the device has been rated for a maximum flow of 1143 m
per hour at a maximum head of 0.6 m.
The Parshall Flume is considered an exponential device, therefore the supplier's data
sheet includes a flow exponent value of 1.522.
The SITRANS LUT400, and the XRS-5 transducer have been installed 1.6 m above the
channel beside the TS-3 external temperature sensor.
During intermittent peak flow times, the head level can be expected to rise at a rate of
approximately 0.12 m/minute. The application also calls for a flow sampler to be activated
3
every 1000 m , or 24 hours (whichever comes first), and for a fail-safe alarm to activate in
the event of a loss of echo or cable fault.
Front View
A5E33329501 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
Plan View
Side View
Zero
Head
TS-3 XRS-5
High Cal.
= 1.0 m
Head
= 0.6 m
C
2
/ C
3
Q
C = Converging dimension
transducer
Low Cal.
= 1.6 m
3
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