Lindab PC 410 - Page 22

22
Measurment type
Short description
Manufacturer specific
formula and unit
Components Formula to determine l/s
considering the density
l/s
∆pq = 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
∆pq = 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)
∆pq = · [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).
Δp= measured pressure
r = air density, calculated on the
basis of temperature and the
pressure
Units V l/s
Dp 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“).