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6.8 Option „Volume“ In this submenu, the content of a closed hermetic room is
determined (e.g. tank, bottle or pipe) with a volume up to
6000 l.
NOTE!
For the volume measurement, a a medical sy-ringe (up
to 100 ml), a Wöhler Soot Test Pump, a cross-union and
connection hoses are needed. We recommend the Wöhler
Leakeage Test Set.
Measuring principle of the determination 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 determined.
The Volume V
tube
is determined with the following equation in
accordance with the principle of the Boyle-Mariott's Law:
V
Tube
= V
Sample
·
∆p
P
act
-1
|Temp. = const.
V
tube
Tube volume to be determined, max.
6000 l
V
sample
Volume drawn as a sample
Dp
Maximum pressure difference that results
when the sample is drawn
p
act
ambient pressure, has to be entered in
the setup menu by the user
(Default: 1013 hPa)
The Lindab PC 410 measures the pressure difference ∆p.
For an exact measuring result, 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 volume (see table).
Guidelines for the selection of the sample volume that has to
be drawn with the soot test pump.
Pump volume Max. tube volume
163 ml
(1 strike with the soot test pump)
80 l
489 ml
(3 strikes with the soot test pump)
240 l
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