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The purpose of the magnehelic gauge is to
measure pressure in the filter plenum. Tnis gauge
cannot be used to measure cabinet airflows. It
gives an indication of static pressure in the filter
area. If the reading is lower that normal, it may
suggest improper blower operation. As filters
load, the gauge indication will rise slowly to show
a higher pressure required to deliver the same air
volume through the filters. Tius is not, however,
a direct reflection of airflow.
Ground Fault Interrupter
The outlets on this unit are protected by a
ground fault interrupter (GEL). The G.FL is
designed to protect the operator from a possible
electrical hazard. If the
G.F.L
detects a hazardous
condition, it will cut
off
electricity to all of the
outlets. The button in the center of the unit will
pop out To reset the G.F.L, correct the cause of
the problem, then press the button in.
Start-up Procedure
1
1.
If the tmit has not been left running
continuously, press the blower on/ off switch.
The yellow indicator above the switd1 will
light Make sure that you have cabinet
airflow, either by listening for blower sound
or feeling the airflow across your fingers.
Check the reading on the air pressure
monitor (magnehelic gauge). See Fig. 5. The
reading on the monitor (magnehelic gauge)
should be consistent with the last time the
unit was on.
2
Turn on thf'> fluoncscent J;ght. The fluorescent
light will not operate unless the ultraviolet
J;ght is turned off. Never leave the
ultraviolet light
011
while there is anyone ilz
the roont.
3.
Check to determine that the drain v'alve is in
the closed position or the drain coupling is
capped.
4.
\Alipe do·vvn the interior area of the cabinet
vvith a surface disinfectant.
Note: Some disinfectants may corrode or
stain the steel surfaces. If this happens, clean
13
the surfaces afterward with a detergent and
rinse with sterile water to prevent corrosion.
5.
Place all materials to be used for the next
procedure inside the cabinet. Disinfect the
exterior of these materials.
Everything required (and nothing more)
sbould be placed in the cabinet before
beginning your work so that nothing passes
in or out through the air barrier until the
procedure is completed. Implements should
be arranged in the cabinet's work area in
logical order so that
cle~n
and dirty materials
are segregated, preferably on opposite sides
of the work area.
Blocking tl1e front and rear perforated grills
must be avoided. If wipes or absorbent
towels are used on the work surface, be sure
to keep them away from the grills.
6.
After your equipment is in place inside the
cabinet, adjust the vertical sliding viewscreen
so ii is open exactly 8", no more and no less.
This aperture is important for proper airflow.
If the viewscreen is at the
wrong
height, an
alarm will sound.
7.
After the cabinet has operated for at least
three minutes with the window in the proper
position, you are ready to begin.
Working in
the
Cabinet Work Space
1.
Hands and arms should be washed
thoroughly with germicidal soap both before
and after work in the cabinet. Operators are
encouraged to wear long-sleeved govvns or
lab coats with tight-fitting cuffs and sterile
gloves. This minimizes the shedding of skin
flora into the work area and protects hands
and arms from contamination
2.
Perfonn all work on the depressed area of the
solid work surface. Work with a limited
number of slow movements. Since all of the
equipnlent you need is already in tl1e cabinet,
it \Vili not be necessary to move your arms in
and out through the air barrier.
3.
Because opening and closing doors in the
laboratorv causes air disturbcmce wluch
might interfere with cabinet airflow, this kind
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