Heraeus HS 15 - Page 180

Manufacturing site / Year Order no.: Sheet:
2/3
Testing Safety Cabinet Class II Type A2 according to NSF/ANSI 49 - 2002
Air inflow speed: Method 2 Hot-Wire Anemometer
Direct measuring inflow air volume in the front window opening with Hot-wire anemometer and compensation factor (on the data plate)
Front panel opening height 3 in (76 mm), measuring points side distance 4 in (10 cm), height 1.5 in (38 mm)
1
Ft/
min
2
Ft/
min
3
Ft/
min
4
Ft/
min
5
Ft/
min
6
Ft/
min
7
Ft/
min
8
Ft/
min
9
Ft/
min
10
Ft/
min
11
Ft/
min
12
Ft/
min
13
Ft/
min
14
Ft/
min
15
Ft/
min
16
Ft/
min
17
Ft/
min
18
Ft/
min
Mean air speed in relation to height of working opening Target value = Mean air speed / 3.33 x compensation factor
Ft/
min
Set value : 105 ft/min + 5 ft/min (0,53 m/s + 0,025 m/s) Requirement fulfilled
Yes
No
Remarks:
Downflow velocity test
Mean downflow velocity, Set value 70 ft/min ( See on data plate ) > +
5 ft/min (+ 0.025 m/s)
Measuring level 50 cm above window opening, set-points for the individual device types are listed on the data plate !
1
Ft/
min
2
Ft/
min
3
Ft/
min
4
Ft/
min
5
Ft/
6
Ft/
min
7
Ft/
min
8
Ft/
min
9
Ft/
min
10
Ft/
min
11
Ft/
min
12
Ft/
min
13
Ft/
min
14
Ft/
min
15
Ft/
min
16
Ft/
min
17
Ft/
min
18
Ft/
min
19
Ft/
min
20ß
Ft/
min
21
Ft/
min
22
Ft/
min
23
Ft/
min
24
Ft/
min
25
Ft/
min
26
Ft/
min
27
Ft/
min
28
Ft/
min
29
Ft/
min
30
Ft/
min
31
Ft/
min
32
Ft/
min
33
Ft/
min
Mean value downflow velocity
Ft/
min
No individual measuring must deviate more than +
20% or + 16 ft/min (+ 0.081 m/s) from mean value!
Requirement
fulfilled
Yes
No
Remarks:
Site installation assessment tests
Airflow alarms : audible and visual alarms indicates incorrect air flow conditions
(
20% loss of exhaust volume in 15 s
)
Yes No
Sash alarm : system warns of unsafe view screen opening [indicates deviation of +
1.0 in (2,5 cm) ]
Yes
No
Exhaust system performance - canopy connection: No smoke escape into the room.
Yes
No
Remarks:
Testing grid measuring points
A
= 4 in (10 cm) distance
over window opening
B = 6 in (15 cm) distance
between side walls
C = 6 in (15 cm) distance between
test area and front window
D = 6 in (15 cm) distance between
test area and rear wall
G
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28
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10
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03
QB
O
utput state
1
min