Labconco XPert Weigh Boxes 5220331 - Manual (Page 10)

Chapter 2: Prerequisites
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Additionally, the motorized impeller can also be used in a full recirculation
mode providing the operator with some control of the atmosphere chemistry
within the glove box. See Chapter 7 for the Recirculation Conversion Kit.
The airflow chart below represents typical operational data including air
changes per minute, exhaust volume, noise levels, main chamber static
pressures, and total system static pressures measured at the blower intake
(suction side). Exhaust volumes are reduced by 17% for products operating
on 100V, 60 Hz and reduced 34% for 100V, 50 Hz products.
Dial Setting
Air Changes
per Minute
(acm)
Exhaust
Volume
(CFM)
Noise Pressure
dB (A)
Static Pressure
Inside Glove Box
(inches of water)
Total System
Static Pressure
(inches of water)
Min. Dial
20 Dial
40 Dial
50 Dial
60 Dial
80 Dial
Max. 100 Dial
Dial OFF
1
1.5
3.3
4.7
6.2
7.2
7.7
0
13
20
43
61
80
93
100
0
44
48
48
65
68
70
71
37 .14
.17
.45
.68
.80
.89
.91
0
.34
.51
1.32
1.81
2.14
2.38
2.42
0
XPERT WEIGH BOX
Static Pressure Test Results
0.14
0.17
0.45
0.68
0.8
0.89 0.91
0.3435
0.5072
1.323
1.81
2.141
2.375
2.422
0
0.5
1
1.5
2
2.5
10 20 30 40 50 60 70 80 90 100
Airflow Volume (Cubic Feet per Minute)
Ne
ga
ti
ve St
ati
c
Pres
su
re
(I
nc
he
s of
Wa
te
r Colum
n
)
Static Pressure Inside Glove Box
Total Static Pressure at Blower
Intake (Suction Side)