ABB LST300 - Open channel flow

LST300 | COMPACT ULTRASONIC LEVEL TRANSMITTER | LST300–EN REV. E
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5 Press to select the position to be changed to the
linearization point number. The first point to update in this
example is point
00 .
6 Press to change the position to Lev.
7 Use to enter the editing menu.
8 Set the level for point 00 in the editing menu.
In this example level
0.000 m is set.
9 Use to select OK and return to the “Linearization Table”
menu.
10 Press

11 Use to enter the editing menu.
12 Set the level for point 00 in the editing menu.
In this example a percentage of
 is set for point 00.
13 Use
to select OK and return to the “Linearization Table”
menu.
14 Repeat steps 5 to 13 for linearization point 01 and 02
according to the data in the table below:
Point Level %
  
  
  
Open channel flow
The LST300 open channel flow function calculates the flowrate
in an open channel by measuring level and converting it to a
flowrate using standard equations. The automated calculation
of parameters can only be done using DTM or EDD. Alternatively
the calculation can be done offline, and the setup can be done
in the field on the HMI using the pre-calculated maximum flow
value and linearization table.
The open channel flow is not calculated directly. A linearization
table and the maximum flowrate are calculated and
downloaded to the device using DTM or EDD. Then this
linearization table is used on the device to calculate the
flowrate.
LST300 supports the following 12 channels:
• Rectangular thin plate weir
• Triangular notch thin plate weir
• Rectangular broad crested weir
• Rectangular throated flume
• Trapezoidal throated flume
• U throated flume
• Round nose horizontal broad crested weir
• Parshall flume
• Palmer bowlus flume
• Round pipe
• Leopold lagco flume
• Cut throat flume
Any custom or special channels with available linearization
transfer curve can also be configured manually.