Xylem Flow Converter 713 User Manual

Page 15

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

/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

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

/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

jumps, single arrow runs the value

slowly with 0.1 m

jumps. The volume can be set in the

volume-span area. The quantity MUST be greater than