Pressure measurement and airflow calculation technical information

technical information
D emand controlled ex trac t unit
Pressure measurement and airflow calculation
The pressure plug integrated in BXC extract unit enables to
measure the pressure by the mean of a manometer, then to
deduce the airflow through a table. Please refer to installation
instruction for details on the operation.
Instruction:
1
Take off the plug stopper and use it to fix the humidity
sensitive airflow at its minimum position as shown
on the picture (push the humidity sensitive lever with
fingers to help closing the driven shutter).
2
Connect a manometer to read the pressure.
1
The chart below (available in the installation instruction)
enables to deduce airflow / pressure according to the fix
shutter position (from 0 to 5).
Pa
2
How to read this chart?
140
Read the corresponding airflow, depending on
the fix shutter position (33 m3/h in this example
when fix shutter is in position n.4).Please notice
that this airflow corresponds to the situation when
relative humidity level is below 30%.
C
110
40
3
35
30
100
2
B
90
80
1
70
0
60
50
45
4
60
70
80
90
Measured pressure in Pa
A
100
110
120
130
25
20
15
10
5
140
Nominal pressure and airflow according to measured pressure (BXC extract unit)
Aereco S.A. - 9 allée du Clos des Charmes - Collégien - F 77615 Marne la Vallée Cdx 3 - tel: +33 1 60 06 26 63 - fax: +33 1 60 06 22 11 - www.aereco.com
FLY469GB_v0
C
Read the nominal pressure (87 Pa in this
example).
120
50
Airflow in m3/h
B
Report the measured pressure (95 Pa in this
example).
Nominal pressure in Pa
A
5
130