12. Function menus
41
rectly from the average value menu by pressing VOL ►> .
This lists the following functions
Cross-section calculation ready :
Channel type
:
Rectangular with width and depth,
Channel type Tubular k:1.00
Tubular with diameter or
diameter : 00175 mm
Surface with cross-section :
cross-section : 02345 cm²
inclusive correction factor (k-factor)
Display of volume flow in m
3
/h:
volume flow
1934. m
3
/h
Display of standardized volume (20°C, 1013 mbar):
standardized :
see 12.2.7
Save data in a volume flow file : <STORE> see 12.2.7
12.2.7 Array measuring Option VN
Average velocity in a flow channel is calculated as
per DIN EN 12599, namely by performing measuring
operations at particular array points in a cross-sec-
tion vertical to the pipe axis (see Manual 3.5.5). To
ensure that all individual values are logged in
standardized form a menu combination
Array
measuring
specially conceived for flow sensors
(m/s) is provided.
In the 1st menu the channel data and a measuring point designation are en-
tered. If a memory connector with SD-card is available, channel data already
acquired selected with PROG , FIRST , NEXT and can be loaded from an existing
file by means of LOAD .
Channel type with k-factor, dimensions, and
number of holes are all prescribed by the chan-
nel; the number of measuring depths and grav-
ity lines are used to calculate the actual meas-
uring depths (3.5.5).
Entering the averaging duration in seconds ensures uniform data acquisition per
point by averaging over a fixed time. If the averaging duration is deleted, its start
and stop are prescribed by the measuring duration.
To select the 2nd menu press key(s) < ►F >
It is thus possible to acquire all measuring points
from the 1st hole right through to the last hole at
all precalculated depths. The measuring operation
is initiated by pressing the <MEAS> key; then each
point is acquired one after the other
with <START> key. Any point can subsequently be
reselected for correction by means of the cursor
keys.
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