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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the flow equation is no longer valid.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.
