Section 5 – Operation
5.1 Control / Indicating Devices (Figures 5-1, 5-2, 5-3)
Before operating the cabinet, become familiar with the fol-
lowing items:
Blower Switch- The blower switch controls power to the inter-
nal blower.
Light Switch- The “Lights” switch controls power to the fluo-
rescent lamp or the optional ultraviolet lamp. Both lamps are
located in the work area.
Ultra-Violet Light - Optional
On cabinets equipped with ultra violet lights, the
lights must be turned off when working in the
unit. Potential eye damage may result from view-
ing the light produced by ultra violet sources.
The UV interlock on this cabinet prevents ultra
violet illumination when the sliding window is
raised. Make sure the sliding window is within
approximately 3/8” of the fully closed position.
On cabinets equipped with the optional ultra-violet germicidal
light, the dual purpose “Lights” switch provides the following
settings:
“Off” = center
“On” top = fluorescent lamp
“On” bottom = ultra-violet lamp on with the window complete-
ly down.
Either the fluorescent lamp or the ultra-violet lamp may be lit
at one time.
Alarm By-pass Switch - The Alarm By-pass switch silences
the audible “Window Above 10 Inch” alarm for approximately
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.
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
thermoanemometer. Replace the filters if proper airflow cannot
be obtained.
The static pressure gauge should not be used as a direct
measure of airflow.
Class II, A2 Biological Safety Cabinets________________________________________________________________Operation
Figure 5-1
4 ft. Series, Models 1284 and 1285
Figure 5-2
5 - 1
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