Measurement Modes in the Main Menu
46
6.8
Option “Volume“
In this submenu, the content of a closed and her-
metic room with a volume up to 6000 l is deter-
mined (e.g. tank, bottle or pipe).
NOTE!
For the volume measurement, a syringe (up to
100 ml), a cross piece and connection hoses are
needed. We recommend the Wöhler Leakeage
Test Set.
Measuring principle of the determi-
nation of the volume
After a sample V
sample
has been drawn with the
syringe (up to 100 ml) or the soot test pump, the
pressure in the tube will change. Based on this
pressure change, the total volume V
tube
can be
calculated.
1
p
p
V
V
act
Sample
Tube
|
Temp. =
const.
(3)
The Volume V
tube
is determined with the following
equation in accordance with the principle of the
Boyle-Mariott's Law:
V
tube
Tube volume to be determined, max.
6000 l
V
sample
Volume drawn as a sample
p
Maximum pressure difference that re-
sults when the sample is drawn
p
act
absolute air pressure, has to be entered
in the setup menu by the user
(Default: 1013 hPa)
The DC 430
FLOW
measures the pressure differ-
ence ∆p. The pressure difference ∆p should at
least amount to 200 Pa so that an exact result can
be reached. Therefore, the sample V
sample
that the
user draws with the syringe or the soot test pump
should amount to at least 1/500 of the tube vol-
ume (see table).
