55
BE 57-660 Eclipse Model 700 Guided Wave Radar Transmitter
3
.4.5.1 Configuration using Flume/Weir Equations
The following table provides an explanation of each of the
System Configuration parameters required for open channel
flow applications using one of the Flow Elements that are
stored in the firmware.
Configuration Parameter Explanation
Flow Units
A selection of Gallons/Minute (factory default Flow Unit), Gallons/Hour, Mil
Gallons/Day, Liters/Second, Liters/Minute, Liters/Hour, Cubic Meter/Hour,
Cubic Ft/Second, Cubic Ft/Minute, and Cubic Ft/Hour are provided.
Flow Element
Select one of the following primary Flow Elements that are stored in the firmware:
Parshall flume sizes of 1", 2", 3", 6", 9", 12", 18", 24", 36", 48", 60", 72", 96",
120" and 144". Palmer-Bwls (Palmer-Bowlus) flume sizes of 4", 6", 8", 10", 12",
15", 18", 21", 24", 27" and 30". V-notch weir sizes of 22.5
O
, 30
O
, 45
O
, 60
O
, 90
O
and
120
O
. Rect with Ends (Rectangular Weir with End Contractions), Rect w/o Ends
(Rectangular Weir without End Contractions), and Cipoletti weir. Custom Table (see
page 57 can be selected if none of the stored Flow Elements can be used. The
table can be built with a maximum of 30 points. The Model 700 also has the capa-
bility of using a Generic Equation (see page 56) for flow calculation.
Weir Crest Length
The Weir Crest Length screen only appears when the chosen Flow Element is
Cipoletti or one of the Rectangular weirs. Input this length in the user-selected
level units.
Flume Channel Width
Allows for entry of the width of the palmer bowlus flume.
V-Notch Weir Angle
Only appears when flow element is V-Notch weir. It allows for the entry of angle of
the V-Notch weir.
Reference Dist
The Reference Distance is measured from the sensor reference point to the point
of zero flow in the weir or flume. This must be measured very accurately in the
user-selected level units.
Maximum Head
Maximum Head is the highest liquid level (Head) value in the flume or weir before
the flow equation is no longer valid. The Maximum Head is expressed in the user-
selected Level Units. The Model 700 will default to the largest Maximum Head value
that is allowed for any given flume or weir. The Maximum Head value can be revised
depending on the value of the Reference Distance, or for end user preference.
Maximum Flow
Maximum Flow is a read-only value that represents the flow value corresponding
to the Maximum Head value for the flume or weir.
Low Flow Cutoff
The Low Flow Cutoff (in user-selected level units) will force the calculated flow
value to zero whenever the Head is below this point. This parameter will have a
default and minimum value of zero.
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