Xylem Flow Converter 713 - Manual (Page 15)

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3.0 Programming of flow calculation
Here the type and size of flume/weir used for the flow
measuring is chosen.
3.1 Flow measuring unit
Here the unit is chosen between m 3 /h and l/s. Use arrow
keys to move between options, and confirm with ENTER.
3.2 Select type and range
There are six options for calculation of flow: Parshall
flume, Palmer/Bowlus flume, V-notch weir, rectangular
weir, linearization and optional flow formula. Select the
desired parameter with arrow keys and confirm choice
with ENTER.
3.3 Venturi flumes
If a Venturi-flume has been selected, there is a choice
between various sizes: 5", 6" and 8". Change between
the various types withe the arrow keys. Confirm with
ENTER. Both the longthroated and the Khafagi flumes
can be chosen.
3.4 Parshall flumes
If a Parshall-flume has been selected, there is a choice
between various sizes: 1", 2", 3", 6", 9", 1', 2' og 3'.
Change between the various sizes with the arrow keys.
Confirm choice with ENTER.
3.5 Palmer/Bowlus flumes
If a Palmer/Bowlus-flume has been selected there is a
choice between various sizes: 6", 8", 10”, 1”, 15” 18”,
4” og 30”. Change between the various sizes with the
arrow keys. Confirm choice with ENTER.
3.6.1 V-notch weir
If a V-notch weir has been selected there is a choice
between 8.1°, 53.1°, 90° and optional weirs. Below the
weir type the measuring range is shown. Change be-
tween the various types with arrow keys. Confirm choice
with ENTER.
The ISO 1438 standard describes the height and flow
relations in detail for a stormflow of 90°, if this angle is
chosen the width of weir and depth under weir must be
keyed in. For other angles only the angle is keyed in.
Provided that a straight inflow on at least 10 x width of
the letter V, and free flow from the under weir of the letter
V.
3.6.2 Key in optional angle
If optional angle is choosen, key in the angle with the
arrow keys. The angle can be choosen between 10° and
89°, confirm selection with the ENTER key.
3.6.3 V-notch weir flume width
Here the width of the flume where the v-notch weir is
placed, is keyed in. Double arrow runs the value fast
with 10 cm steps, single arrow runs the value slowly with
0,1 cm steps.
3.6.4 V-notch weir depth below edge
Here the depth of the flume below the bottom of the trian-
glular weir is keyed in with the arrow keys. Double arrow
runs the value fast with 10 cm steps. Single arrow runs
the value slowly with 0,1 cm steps.
3.7.1 Rectangular weir flume width
Here the total width of the channel where the rectangular
weir is placed is keyed in. Use arrow keys. Double arrow
runs the value fast with 10 cm steps, single arrow keys
runs the value slowly with 0,1 cm steps.
3.7.2 Rectangular weir edge width
Here the width of the rectangular weir is keyed in with
the arrow keys. Double arrow runs the value fast with 10
cm steps, single arrow runs the value slowly with 0,1 cm
jumps.
3.7.3 Rectangular weir depth below edge
Here the depth of the channel below the bottom of the
rectangular weir is keyed in with the arrow keys. Double
arrow runs the value fast with 10 cm steps, single arrow
key runs the value slowly with 0,1 cm steps.
3.8.1 Linearization number of Q(h) points
The desired number of Q(h)-points, are indicated for
the linearization. The figure can range between 1 and
10. Use arrow keys. The number of points decides how
many times you run through the menus 3.8. og 3.8.3.
Always start with the lowest value, then the next and so
on until the largest value is reached.
3.8.2 Linearization height point
Here level [h] in a Q(h)-point is keyed in. The level is
keyed in with the arrow keys. Double arrow runs the
value fast with 10 cm steps, single arrow runs the value
slowly with 0,1 cm steps. The level can be set in the level
span area. The level MUST be higher than previously
keyed in levels. The quantity can only be shown in total
of m 3 /h or l/sec. The highest Q(h)-point automatically
gives the measuring range.
3.8.3 Linearization flow point
The volume [Q] in a Q(h)-point is keyed in. The volume
is keyed in with the arrow keys. Double arrow runs the
value fast with 1 m 3 jumps, single arrow runs the value
slowly with 0.1 m 3 jumps. The volume can be set in the
volume-span area. The quantity MUST be greater than