Drawell DW-280D User manual

Model DW-280D(digital：18L/24L/30L
)
PORTABLE STEAM STERILIZER
USER’S MANUAL

Warm tips
1. Please read the instruction manual carefully before operating the equipment, and
make the book well-kept, so that you can make reference to and we can serve for
you in the future .
2. We are not responsible for the damage and malfunction due to improper
installation, operation, moving, and other contrived reasons.
3. If the safety valve doesn’t vent even when the pressure gauge pointer exceed
0.165Mpa, stop using immediately and check its sensitivity. Don’t strike the
apparatus during using; never use the machine under over-high pressure
condition; pressure gauge must be checked 1-2times every year to ensure its
accuracy.
4. The equipment should be keep clean and dry in ordinary times, pour water out of
container when finishing using, to help to prolong the life of the sterilization
machine.
5. Check the sealing ring to find whether abrasion or aging occur, and change it
timely, to ensure its sealing capacity.
Brief introduction
The sterilization machine we produce for objects sanitation and sterilization works through
saturated high-pressured steam, it has following advantages of being easy to operate, heating up
quickly, sterilizing thoroughly etc. It can be used in hospitals, academies of health, health care
stations, infirmaries in mineral factories, laboratories, cosmetic factories, food factories,scientific
research centers and so on.It can work on medical apparatus, dressing, glass utensils, solution,
culture medium, etc. It can also be used as cook instrument inAltiplano area.

Main body structure
Structure characteristics
1. The main body of the container to our product is made of high—quality stainless
steel with one portion of Gr, eighteen of Ni, nine of Ti. Our product is not only
acid—proof,alkali--proof,but also safe and durable to consume, its life is three
times longer than aluminum metal alloy product.
2. Our product heated up by immersion electric heating tube, consumes little power,
while temperature goes up quickly.
3. Vary heating method available, such as liquefied gas, coal gas, coal gas
stove,firewood,etc.
4. The safety valve can release over-high pressure automatically when the steam
pressure exceeds 0.165MPa to insure the safety.
5. The pressure gauge is designed to have double scales, with two types
of reading to show pressure and temperature clearly.
1
1. Safety valve
2. Handle
3. Pressure gauge
4. Steam release valve
5. Container lid
6. Silicone seal
7. Butterfly nut
8. Bolt
9. Container
10. Sterilization chamber
11. Sieve plate
12. Electric heating tube
13. Water discharge cock
14. Set key
15. Led digital display screen
16. Increase/decrease key
17. Start/Stop key
18. Buzzer
19. Wrench
20. Power cable

Technique parameters
1. Capacity of disinfect cylinder:0.018 m3、0.024 m3、0.030m3
2. Working pressure rating: 0.14MPa
3. Maximal safety pressure: 0.165MPa
4. Power source pressure: 220V
5. Power of electricheatingtube：2.0kW
Installation and debugging
1.Take out the product from the packing box properly.
2.The apparatus must be installed on flat surface; not in rugged ground.
3.The left 、right and back sides of the apparatus should be kept away from
walls by 15cm at least.
4.To be sure the power source voltage is in accordance with the demand of the
apparatus, and dependable earth wire required.
5. Don’t locate the apparatus near inflammable gas sources; it should be installed in
dry and ventilate environment.
Operating instructions
1. Adding water
It can be used when 3.5L water has been added into the container, but the water level
can’t exceed the three shelving plane which is under inner barrel. Water rating must
be supply enough during recycle use, in order to prevent damaging the electric heating
tube due to water shortage.
2. Heaping objects
Put these objects needed to be sterilized on sieve plate, there should be gaps among

these packed objects, to help steam to permeate and improve working quality.
3. Air proofing
Put the sanitizing cylinder into the container, and then insert the soft tube which is
on container lid into the semicircle groove in the cylinder ，screw the container lid
with wing-shaped nut in container tightly, make no distance between the lid and
container.
4. Heating
The power cord into the electrical socket outlet, confirm the emergency stop knob
turn on, open the air switch, open the control switch, digital display on the row
measured barrel temperature, the next row of digital display set sterilization
temperature.
(1)Press setting key, the row digital display temperature code (SP), digital
display temperature value, click the Change button; adjust to the required
sterilization temperature. (Onset temperature is the last set temperature)
(2)Press setting key again, the row digital display of time code (ST) and the
time values, click the Change button, adjusted to required sterilization temperature,
ST is "0", the controller cancel timer function (start time set is the last time).
(3)The third time to click the set button to confirm setting parameter, the digital
control to return to display the main interface
(4)Press the start /stop key, start sterilization, running lights flashing, at this
time should open steam valve cap. To escape the cold air inside the sterilizer, when
the steam valve ejected hot steam, (temperature is about 100°C), closed steam valve
till to the end of work, buzzer alarm is on, digital display under the row show“End”.
(5)If you want to cancel the sterilization work order, press the start / stop button
for 3 seconds, the controller stops working, buzzer alarm is on, press any key to stop
the noise. When water is shortage, the controller automatically stops working. Alarm
is on, and presses any key to stop the noise. In case of emergency, timely press the
emergency stop knob. Turning on the power before solve the problems.

5. Cooling
When the sterilization is finished, first, you should turn off the power, let it cool
down to a pressure gauge reading zero and then back to open steam valve and the
container lid, not the end of the sterilization, immediately open the exhaust valve or
open the container lid, avoid boiling solution overflow, causing the accident
Notice the use and maintenance
1. Sterilizer used must be operated in accordance with the contents of this note, to
prevent accidents.
2. Should ensure that the water, the water level is too high, too wet dressing and a
waste of power, the water level is too low the equipment will not work, so if you
need to carry out disinfection and sterilization should add proper water.
3. Start heating, steam release valve must be open; to make the cold air to escape,
otherwise they will not get a good sterilization effect.
4. Every time after the disinfection and sterilization must turn off the power switch.
5. Sterilization of the solution, the solution should be poured into the high
temperature inside the bottle, poured into the volume of the bottle 3 / 4 of volume is
appropriate, the mouth stuffed with gauze and avoid the cork with no ventilation.
6. After sterilization is finished: If the sterilized object is a solid article, the two
safety value can be switched to steam let-out position and when of the pressure
gauge return to “0” position, the cover of the container can be opened, if the
sterilized object is a solution or culture medium, never let out steam immediately.
You should first turn off the power and wait till the hand of the pressure gauge return
to “ 0 ” before opening the cover of the container.
7. After sterilization, drain the water from the sterilizer while it is hot and clean the
water stain in the container to improve the quality of sterilization, save energy and
5

prolong the service life. If there is much water stain that cannot be cleaned, the
solution made up of 10Kg of water. 1kg of caustic soda and 0.25kg of kerosene can
be used. Put the solution into the container and let it soak for about 10 hours. Then
clean the water and finally rinse with clean water.
8. Replace the sealing washer in time as it will age after a long time of use and affect
the sealing effect.
9. The pressure gauge should be tested at least once a year. If the hand of the gauge
cannot return to“0” position, it should be professionally repaired or replaced,
otherwise the sterilization effect and safety will be affected.
Different Materials Sterilization Time & Pressure & Temperature
Object
of
sterilization
Time
For
temperature
holding(min)
Steam pressure
(gauge pressure)
Relative
temperature
of saturated steam
Mpa
Kgt/cm2
Lbf/ln2
Rubber
15
0.1- 0.105
1 -1.05
14.3 - 15
121℃
Dressing
30 - 45
0.105 - 0.14
1.05 -1.4
15 - 20
121 - 126℃
Utensils
15
0.105 - 0.14
1.05 -1.4
15 - 20
121 - 126℃
Appliances
10
0.105 - 0.14
1.05- 1.4
15 - 20
121 - 126℃
Bottled
solutions
20 -40
0.105 - 0.14
1.05 - 1.4
15 - 20
121 - 126℃

DW-280D Digital Circuit Diagram
1. K—— Control switch
2. C —— Control panel
3. L —— Lever sensor
4. T —— Temperature sensor
5. M —— Solid-state relay
6. R —— Electric heating tube