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12 - FLOW MEASUREMENT DEVICE
12.1 - Description
A diaphragm measures the returned air flow rate through the
ICM.
The total air flow treated by the ICM is the sum of the
returned air flow and the fresh air flow. The diaphragm is
accurate, reliable, fast and silent. Using an electronic pressure
gauge it is possible to determine the air flow simply by
interpolating from a chart provided on the unit.
NOTE:
To measure the air flow, there must be a straight length of
duct at least four times as long as its own diameter located
upstream of the diaphragm.
12.2 - Pressure diaphragm characteristics
12.2.1 - ICM sizes 1.3 and 2.3, 200 mm spigot diameter
Pressure drop (Pa) as a function of air flow (m
∆ P (Pa)
65
60
55
50
45
40
35
30
25
20
15
10
5
0
0
0
26
3
/h or l/s)
5
3
1
28
56
100
200
20
13
11
8
83
111
300
400
Air flow, m
3
/h or l/s
52
44
36
31
30
21
139
167
500
600
60
194 l/s
3
700
m
/h
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