Forma Scientific, Inc._________________________________________________Operation
4-2
Either the fluorescent lamp or
the ultra-violent lamp may be lit
at one time.
d. Alarm By-Pass
Switch
The Alarm By-Pass
switch silences the audible
“Window Above 10 Inch”
alarm for five minutes. The
red visual indicator remains
illuminated. The alarm rings-
back to remind the operator
that the window is still open
more than 10 inches.
e. Static Pressure
Gauge (In. W.G.)
The static pressure
gauge measures the air
pressure differential across
the filters providing an
indication of filter "loading".
As the filters become loaded,
resistance increases and the
reading on the static pressure
gauge increases accordingly. When the reading
increases by 50% from original measurement, cabinet
airflow should be checked with a
Exhaust HEPA filter
24 x 24 x 6
“””
Blower housing with
direct drive motor
Supply HEPA filter
18 x 72 x 6
“””
Fluorescent light
canopy
Front air intake
grille
Work surface
Extra valve ports,
two on each side
Removable rear
paper catch
Standard duplex
outlets, one on
each side
Standard key cocks,
one on each side
Side View
Sliding window
w/safety glass
Exhaust filter
grille
External Damper
Control
Removable side
paper catch, one
on each side
Drain valve
Series 1284 Class II A/B3 Biological Safety Cabinet
Removable vortex
channel
Speed control
access panel
Speed control
access panel
Dwyer, 0“ - 2”
mini-helic gauge
Front View
1
.
5
1.0
1
.
0
0
2
.
0
Figure 4-3
Figure 4-2
6-foot Series, Models 1286, 1287, 1290, and 1291
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