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138 Series Sterilizers
Operations and Maintenance Manual
(4)
The
jacket
pressure
will fall
as
the
chamber fills with steam.
Both the jacket
and chamber will then build up the desired
pressure.
Begin the timing of the exposure
period
when
the
thermometer
in
the
chamber
drain
line
reads
the
desired
temperature.
(5) At the end of the exposure period, turn
the operating valve to fast exhaust for fabric
or instrument
foads,
or slow
exhaust
for
solution loads.
Leave the machine alone until the chamber
pressure gauge shows zero pressure.
(6) If a drying
phase
is required
for the
sterilization cycle, (such as in fabric loads),
turn the operating valve to dry.
(7) Turn the operating valve to off.
Loosen
the door locking arms and allow the load to
cool for five minutes,
Open the door and
remove the load.
The sterilizer may
be reloaded
and a new
cycle may
be started immediately.
If the
sterilizer will not be used again, turn off the
heat source and turn the operating valve
handle to the dry position.
This bleeds off
pressure and vents the jacket to prevent a
vacuum.
Keep the sterilizer door closed, but
not tightened.
This also prevents formation
of a vacuum.
5.0
RECOMMENDED
EXPOSURE
PERIODS
Fabric Loads
....... 30 minutes at 250°F
Dry for 15 minutes.
Solution Loads (1000 mi flasks) ........
30 minutes at 250°F
Slow exhaust to zero pressure
Crack door open for 5 minutes.
*
Original
s
November, 1996
Emergency (small instrument load) 3 minutes
at 270°F Fast exhaust.
When
sterilizing
solutions, use only thermal shock resistant
containers.
These
containers
must
have
self-venting enclosures.
Do not leave the
door open or remove the glass containers
until
the
chamber
drain
thermometer
indicates 200°F or lower.
6.0
PREVENTIVE MAINTENANCE
Perform
the
preventive
maintenance
to
ensure a trouble-free sterilizer.
Preventive
maintenance also adds to equipment service
life by
keeping
the sterilizer
in optimum
condition.
If available,
use
only
distilled
water.
If
distilled water is not available, use water as
pure as possible.
Demineralize and filter the
water as required to assure that the water is
free of mud, sediment, and minerals.
Use care when filling the sterilizer jacket to
prevent water overflow.
When
filling, vent
the air from the jacket by manually actuating
the safety valve or by turning the selector
valve Knob temporarily to sterilize, with the
chamber door open.
Entry of water into the
low-water
cut-off
switch
enclosure
can
disable
this
essential
protective
device.
Never clean the sterilizer by hosing it down.
Daily, check the low water cutoff and sight
glass
for proper
function
by
opening
the
drain valve and draining the jacket while the
heating elements are turned on.
The low-water cutoff should actuate to turn
off the power by the time that the jacket is
drained.
The water gauge should now show
empty.
M_138.DOC
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