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730 Bubbler Module
Section 2 Programming the Module
2-7
The following table contains programming information for each
of the conversion types.
2.5 Alternative Flow
Measurement Systems
Because of the characteristics of bubbler flow measurement,
there may be some installations where the bubbler method is
either unreliable or inaccurate. In these instances, it is worth-
while to consider using an alternate method of flow mea-
surement.
In addition to the 730 Module, Teledyne Isco offers three other
types of plug-and-play flow modules in the 700 Series: the 720
Submerged Probe Module, the 710 Ultrasonic Module, and the
750 Area-Velocity Module.
Information about these flow modules is available from the
factory. Call for more information or visit our Web site at
www.isco.com.
Table 2-1 Flow Conversion Types
Conversion Type Device, Formula, or Table Size or Parameters
Weir V- Notch Weir 22.5, 30, 45, 60, 90, 120 degrees
Rectangular Weir with End
Contractions
Crest length
Rectangular Weir without End
Contractions
Crest length
Cipoletti Weir Crest length
Flume Palmer-Bowlus Flume 4, 6, 8, 10, 12, 15, 18, 21, 24, 27, 30, 48 inches
Parshall Flume 1, 2, 3, 6, 9 inches
1, 1.5, 2, 3, 4, 5, 6, 8, 10, 12 feet
Trapezoidal Flume Large 60-degree V
2-inch, 45-degree WSC
12-inch, 45-degree SRCRC
“H” Flume 0.5, 0.75, 1, 1.5, 2, 2.5, 3, 4.5 feet.
Equation Q = a x H
b+c
x H
d
Q = flow
H = head
a, b, c, & d = entered values
Data Points User-developed tables for level-to-flow
rate. Includes data points from a user
derived flow profile.
3 to 50 data points
Manning Equation Round Pipe Slope, Roughness, Diameter
U-Channel Pipe Slope, Roughness, Width
Rectangular Pipe Slope, Roughness, Width
Trapezoidal Slope, Roughness, Bottom Width, Top Width
Flow Metering Insert V-Notch 6, 8, 10, 12 inch
Round 6, 8, 10, 12 inch