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6.2 Option “Air flow (k value)” Select the submenu "Air flow (k-value)" to measure the air
flow at apertures or similar measuring openings of air pipes
or vents. This method is simple and precise and therefore
suitable for the adjustment of air pipe systems and vents.
6.2.1 Theoretical background In this menu, the air flow measurement is based on the k
value. The k value is a factor which describes the relation
between the decrease in pressure and the air flow.
The air flow of measuring equipments mentioned in chapter
6.2 is proportional to the term
.
The different manufacturers indicate the proportionality factor
in a different way (see table 1). In the PC 410 the measure-
ment type is indicated with the corresponding short descrip-
tion (see table 1). The user can choose the unit of the volume
flow in the setup-menu (l/s, m³/h, m³/s, cfm). The factory
setting is l/s and m3/h respectively.
NOTE!
If you select a certain measurement type in the setup-menu,
the displayed unit will not change automatically.
The PC 410 will always calculate with the unit l/s, even when
another unit is displayed. Table 1 shows the formula used for
the calculation.
For all calculations, the PC 410 will consider the standard
air density r, if no external temperature probe is connected.
When a temperature probe is connected, the air density will
be calculated automatically.
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