64
57-606 ECLIPSE Model 706 Guided Wave Radar Transmitter
3.4.5.3 Configuration using Custom Table
The following table provides an explanation of each of the
System Configuration parameters for open channel flow
applications using the Custom Table.
SPLINE OR LINEAR
SPLINE
P1
P2
P3
P4
P5
Concentrate points along curve
P2
P3
P7
P10
Transition
point
P1
Concentrate points as follows:
A. At least two points at beginning (P1 and P2);
B. At least two points at end (P9 and P10);
C. Three points at approximate average flow rate (for
example, P3, P4, P5); and at transition point (P7)
and points on either side (P6, P8).
P5
P4
P6
P8
P9
Average flow rate
Configuration Parameter
Explanation (Open Channel Flow — Custom Table)
Flow Units
A selection of
Gallons/Minute
(factory default
Flow unit
),
Gallons/Hour,
Mil Gallons/Day, Liters/Second, Liters/Minute, Liters/Hour, Cubic Meters/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 65 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 706 also has the capa-
bility of using a
Generic Equation
(see page 66) for flow calculation.
Custom Table
The
Custom table
points can be a
Linear
(straight line between adjacent points) or
Spline
(can be a curved line between points) relationship. Refer to the drawing
above for more information.
Cust Table Vals
A maximum of 30 points can be used in building the
Custom table
. Each pair of val-
ues will have a Head (height) in the units chosen in the
Level units
screen, and the
associated flow for that Head value. The values must be monotonic, i.e., each pair
of values must be greater than the previous Head/flow pair. The last pair of values
should have the highest Head value (usually the
Maximum Head
value) and the flow
associated with that Head value.
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 706 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.
