22
Measurment type
Short description
Manufacturer specific
formula and unit
Components
Formula to determine l/s
considering the density
l/s
∆
p
q = k
·
[l/s]
e.g. small fans and
air passages, iris
and calipers
1,2 ·
V
=
K
[l/s]
·
K
min
= 0,1
K
max
= 1000
ρ
∆
p
E
m³/h
∆
p
q
=
k
·
[m³/h]
e.g. fans and air
passages
1,2 ·
3,6
V
=
K
[m³/h]
·
K
min
= 1
K
max
= 5000
ρ
∆
p
E
1/(m³/s)
∆
p
q
=
·
[m³/s]
1
k
e.g. Scandinavian
fans
1,2 · 1000
·
V
=
K
[1/(m³/s)]
ρ
∆
p
E
K
min
= 0,01
K
max
= 100
(m³/s) × 1,3
q
=
K
·
[m³/h]
ρ
2
× ∆
p
only used by few
German fan produc-
ers
1,2 ·
3,6
V = K
[m³/h·1,3]
ρ
∆
p
E
K
min
= 1
K
max
= 5000
Table 1
Explanation:
V
= air flow
k
= k value (Take the k-value
from the data sheet and enter it
Into the meter).
Δ
p
= measured pressure
r
= air density, calculated on the
basis of temperature and the
pressure
Units
V
l/s
D
p
in Pa
p
in kg/m³
E
0,50 – 1,00
• In the Setup-Menu, select the formula that corresponds to the manufacturer according to table 1
(Setup>k-Value).
By default, the exponent will be 0.5 as indicated in the formula. Some fan manufacturers inform
explicitly in the data sheet that a special exponent has to be used for the airflow calculation.
• In this case, enter the exponent indicated in the data-sheet, in the setup-menu of the PC 410.
(see chapter 6.12, „exponent“).
