F
tot
∙ RD = 1 ∙ 0.75 = 0.75
l
min
�
FC = F
totale
-F
diluizione
= 1 − 0.75 = 0.25
l
min
�
1 =
1
1
V2n =
(
VD2
fin
-V2
ini
)
∙
∙
amb
16 | QB1 User Manual
Dilution volume:
V2n = Dry gas meter volume “LINE 2” (dilution) (at
273 K and 101.3 kPa conditions) [Nl]
V2ini, V2n= Dry gas meter volumes at start and end
of sampling [l]
Tdgm2 = Temperature at Dry gas meter “LINE 2” [K]
Sampled volume is:
An example:
• Jumbo tubes 1000 mg with 1.0 l/min owrate
• ambient temperature 20 °C
• gas humidity 10% (rw 0.1)
From the graph, the RD value is about 0.75
e dilution owrate:
e dilution owrate on LINE 2 owmeter. e
actual FC sampling ow is given by:
e sampled volume is the dierence from Total
volume and dilution volume:
V1n = Dry gas meter Volume contatore LINE 1 (at 273
K and 101.3 KPa conditions) [Nl]
V1ini, V1n = Dry gas meter volumes at start and end
of sampling [l]
Pamb = Ambient pressure [kPa]
Tdgm1 = Temperature at Dry gas meter “LINE 1” [K]
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