MELAG Sterilizer 255 User manual

User Manual
Sterilizer 255
Dry-heat sterilizer
EN
Dear customer,
We thank you for your confidence demonstrated by the purchase of this MELAG product. As an owner-run and operated
family concern founded in 1951, we have a long history of successful specialization in hygiene products for practice-
based use. Our focus on innovation, quality and the highest standards of operational reliability has established MELAG
as the world’s leading manufacturer in the instrument treatment and hygiene field.
You, our customer are justified in your demand for the best products, quality and reliability. Providing "competence in
hygiene" and "Quality – made in Germany", we guarantee that these demands will be met. Our certified quality man-
agement system is subject to close monitoring: one instrument to this end is our annual multi-day audit conducted in ac-
cordance with ISO13485. This guarantees that all MELAG products are manufactured and tested in accordance with
strict quality criteria.
The MELAG management and team.

Contents
Contents
1 Safety.....................................................................................................................................................................................4
2 General guidelines ...............................................................................................................................................................5
Formatting rules ...................................................................................................................................................................5
Symbols used.......................................................................................................................................................................5
Symbols on the device .........................................................................................................................................................6
3 Description of the device.....................................................................................................................................................7
Scope of delivery..................................................................................................................................................................7
Intended use ........................................................................................................................................................................7
Views of the device ..............................................................................................................................................................8
Loading variations ................................................................................................................................................................9
4 Setup and installation ........................................................................................................................................................10
Requirements of the installation location ...........................................................................................................................10
5 First steps ...........................................................................................................................................................................11
Switching the hot air sterilizer on and off again..................................................................................................................11
Opening and closing the door ............................................................................................................................................12
Changing the mount...........................................................................................................................................................12
6 Sterilization .........................................................................................................................................................................13
Preparing the sterilization material.....................................................................................................................................13
Loading the dry-heat sterilizer............................................................................................................................................13
Information regarding routine operation .............................................................................................................................14
Setting the temperature......................................................................................................................................................14
Selecting the sterilization times..........................................................................................................................................14
Removing the sterilized equipment ....................................................................................................................................14
Storing sterile instruments..................................................................................................................................................15
7 Function tests.....................................................................................................................................................................16
Periodical checks ...............................................................................................................................................................16
8 Maintenance........................................................................................................................................................................17
Checks and cleaning..........................................................................................................................................................17
9 Malfunctions .......................................................................................................................................................................18
General events...................................................................................................................................................................18
10 Technical Data ..................................................................................................................................................................19
11 Accessories ......................................................................................................................................................................20
Glossary .................................................................................................................................................................................21

1 Safety
4
1 Safety
When operating the device, comply with the following safety instructions as well as those
contained in subsequent chapters. Use the device only for the purpose specified in these
instructions. Failure to comply with the safety instructions can result in injury and/or
damage to the device.
Set-up installation and commissioning
nOnly have the device set up, installed, and started up by people authorized by
MELAG.
nIn accordance with current VDE specifications, the device is unsuitable for operation in explosive at-
mospheres.
nThe device may only be repaired by the manufacturer or an agency which he has authorized to do so
(stockist or customer services).
nCheck the device for any damage suffered during transport after unpacking.
nThe sterilizer should always be lifted and carried by two people.
Power cable and power plug
nOnly the power cable included in the scope of delivery may be connected to the device.
nThe power cable may not be replaced by a cable determined to be insufficient.
Danger of short circuit
nLiquids may not be permitted to reach the interior of the device. This could result in an electrical shock
or short circuiting.
Preparation and sterilization
nDo not place the objects to be sterilized on material produced from cellulose (e.g., paper, paper tow-
els, staple fiber, bandage material, etc.); this material would produce excessive heat accumulation
which would prevent the required heat equalization in the sterilizer.
nObserve the relevant standards and directives for the preparation of instruments.
nIn the case of obvious or suspected damage/defects, the device may not be operated further. In such
cases, the device has to be repaired.
Repair
nNever open the housing of the device. Incorrect opening and repair can compromise electrical safety
and pose a danger to the user. The guarantee and warranty are forfeited as soon as the device is
opened by anyone other than a member of a MELAG-authorized technical customer service.

2 General guidelines
5
2 General guidelines
Please read this operating manual carefully before commissioning the product. The instructions include im-
portant safety information. The functionality and value-retention of this device depend primarily on the care
accorded to it. Make sure to keep the Operating Manual near to the device. It represents a component of
the product.
Formatting rules
Example Explanation
see Chapter 2 Reference to another text section within this document.
Symbols used
Symbol Explanation
Indicates a dangerous situation, which if not avoided, could entail slight to life-
threatening injuries.
Draws your attention to a situation, which if not avoided, could result in damage to the
instruments, the practice fittings or the device.
Draws your attention to important information.

2 General guidelines
6
Symbols on the device
Manufacturer of the product
Date of manufacture of the product
Product serial number from the manufacturer
Article number of the product
The user manual includes important safety information. Failure to comply with these
instructions can result in injury and material damage.
Please read this user manual carefully before commissioning the device.
This symbol indicates that the marked area becomes hot during operation. Contact with
it during or shortly after operation can pose the danger of burns.
In affixing the CE mark, the manufacturer declares that this product fulfils the basic
requirements of the EMC and low voltage directive.
The device may not be disposed as domestic waste. The vendor is responsible for
appropriate disposal of the device - it must be delivered to the vendor to be disposed of.
In affixing this symbol, the manufacturer furthermore declares that he has satisfied all the
legal requirements pertaining to the release, redemption and environmentally sound
disposal of electric and electronic appliances.
MELAG devices are synonymous for long-term quality. When you eventually need to
decommission your MELAG device, we offer a special disposal service. Simply contact
your stockist.

3 Description of the device
7
3 Description of the device
Scope of delivery
Please check scope of delivery before connecting the device.
Standard scope of delivery
▪ Sterilizer 255 (including 6 mountings)
▪ User manual
▪ Declaration of conformity
▪ Warranty certificate
▪ Power cable
Optionally
▪ Tray
▪ Tray jack
Intended use
This hot air sterilizer is intended for use in the cosmetics sector, the cosmetic chiropody and the veterinary
sector. It was designed for the sterilization of objects made of non-flammable (inorganic) materials with a
minimum temperature resistance of 220°C (e.g. metal, glass, porcelain, stone or enamel). Comply with
the restricting information from the instrument manufacturer. Porous sterilization material is unsuitable for
hot air sterilization.

3 Description of the device
8
Views of the device
2
15
4
3
67
Fig.1: Fore device view
1 Temperature controller
2 Indicator lamp heating
3 Thermometer
4 Indicator lamp network
5 On/Off switch and time setting
6 Door (opens forwards)
7 Door handle
8
11
910
Fig.2: Rear view of the device
8 Fan
9 Device foot
10 Type plate
11 Connection for the power supply
and the device fuse
12 13
Fig.3: Inside view of the device
12 Mounting
13 Sterilization chamber

3 Description of the device
9
Loading variations
The hot air sterilizer is delivered with a mount for the acceptance of six trays. If at least six trays are or-
dered with the device, the scope of delivery will include a tray jack.
The following loading versions are possible in the device:
Standard mount
The series equipment comprises a mount for six trays.
Load with three trays
Insert just three trays in the mount when seeking to treat taller sterilization material.

4 Setup and installation
10
4 Setup and installation
Requirements of the installation location
NOTICE
The mains plug and the fuse must be easily accessible.
nSet up the device in such a fashion that the power plug can be disconnected from the mains
quickly following danger and that the fuse is easy to access.
Please observe and comply with the following instructions relating to the set-up.
uInstall the device in a dry and dust-protected location.
uInstall the device with a minimum clearance of 10 cm to other devices and walls, especially flammable
parts.
uEnsure sufficient ventilation. Ensure sufficient clearance to the top for free removal of the warm air.
The device may not be used as an installation device and not be used in the immediate treatment
area.
uThe installation surface must be level and able to support the weight of the unit.
Tests after set-up
Perform a temperature check after setting-up the device using thermo sensors or bio indicators. Place the
test equipment in the area of the sterilization chamber in which the sterilization temperature is reached the
most slowly. This also depends on the arrangement and nature of the sterilization material.

5 First steps
11
5 First steps
Switching the hot air sterilizer on and off again.
The hot air sterilizer is activated via the time switch (On/Off switch) and switches itself off after a pre-set
time. The fan comes to standstill after c. 45 seconds.
PLEASE NOTE
Disconnect the mains plug if the device has not been operated for a long period of time.
Setting the operating time:
}Set the On/Off switch to the required operating time (turn clockwise).
ÊThe control lights network and heating will remain illuminated until the time expires.
ÊThe hot air sterilizer can be set to continuous operation. In this case, the hot air sterilizer must be
switched off manually.
Activating and deactivating continuous operation:
}Switch the On/Off switch to the "I" position (turn anti-clockwise).
ÊThe control lamp will remain illuminated; the control lamp for the heating will switch on and off. The set
temperature will be kept constant by the heating switching on and off.
}Switch the On/Off switch to the "0" position to switch off continuous operation.
ÊThe control lamps network and heating will extinguish.

5 First steps
12
Opening and closing the door
CAUTION
Danger of burns from hot metal surfaces
nAllow the device to cool sufficiently before opening.
nDo not touch any hot metal parts.
ü The device must always be deactivated before it is opened. Do not open the door or add any objects
after the sterilization procedure has started; this could result in cooling and the object not being steri-
lized for a sufficient time.
1. Move the On/Off switch to the "0" position to switch off.
2. Open the door forwards to open.
3. Move the door forwards to open.
Changing the mount
The mounts are installed to the left and the right in the sterilization chamber and can be replaced as fol-
lows:
1. Slide the mount upwards from below and pull off to the side.
2. Set the mount with the screws into the larger aperture and press the mount downwards.

6 Sterilization
13
6 Sterilization
Preparing the sterilization material
Cleaning and disinfection must always have been performed before sterilization. Only in this way is it pos-
sible to guarantee the subsequent sterilization of the sterilization material. The materials used, the clean-
ing fluid and treatment procedures used are of decisive significance.
Comply with the following specifications before loading:
uClean, disinfect and dry the instruments before every sterilization.
uComply with the specifications of the manufacturer’s cleaning and care information when
decontaminating the sterilization material. Only so is it possible to guarantee correct cleaning and
disinfection and subsequent sterilization.
uNever place the sterilization material together in blocks, as this will prevent heat equalization.
uDo not place the sterilization material on cellulose, as this can result in a heat build-up.
uAlways pack the sterilization material in aluminium containers. Stainless steel is unsuitable due to its
reduced heat conductivity. Do not use any textiles, paper or polyamide film as packaging. This
packaging is unsuitable for high sterilization temperatures.
Loading the dry-heat sterilizer
Only when correctly loaded is effective sterilization and good drying possible. Ensure the following during
loading:
uInsert trays or cassettes in the chamber only with their appropriate mount.
uWhen loading, ensure that air can circulate around the instruments unhindered. Do not load the trays
or standard tray cassettes one-sided and do not stack the sterilized equipment.
Example of a correct load
Tray
Example of an incorrect load
Tray

6 Sterilization
14
Information regarding routine operation
The sterilization temperature before every sterilization procedure must amount to 180 °C. To this end, the
setting of the sterilization time must take into account the Equilibration time. The pure aborticide time
amounts to 30 minutes at 180 °C.
1. Wait 15 minutes after the thermometer has reached 180 °C.
2. Set the required sterilization time. Comply with the specifications under Selecting the sterilization
times [}page14] .
3. Check the ventilator noise: ensure that the mechanical air movement is functioning correctly.
Setting the temperature
Set the temperature for the hot air sterilizer as follows:
1. Turn the temperature control to 180 °C.
2. Wait until the thermometer reaches 180°C and allow the device to heat up for 15 minutes.
ÊDuring this time, the hot air sterilizer heats up the complete sterilization chamber.
3. Set the sterilization time via the “On/Off switch”. Comply with the information of the sterilization times
table.
Selecting the sterilization times
Do not exceed the specified loading quantities. Use only trays and cartridges made of aluminium. When
needing to pack with foil, use aluminium foil.
Table1: Load type and operating time
load Packaging Pre-heating time Operating time
max. of 3 kg, including 6 trays unwrapped 15 min 90 min
max. of 6 kg, including 6 trays unwrapped 15 min 120 min
Removing the sterilized equipment
CAUTION
Danger of burns from hot metal surfaces
nAllow the device to cool sufficiently before opening.
nDo not touch any hot metal parts.
CAUTION
Unsterile instruments resulting from damaged or burst packaging. This endangers the
health of your patients and practice team.
nShould the packaging be damaged or have burst, re-pack the sterilization material and re-
sterilize it.
Comply with the following when removing the sterilized equipment:
uUse a tray jack to remove the tray.
uNever touch the sterilized equipment, the device interior or the inside of the the door with unprotected
hands. The components are hot.

6 Sterilization
15
Storing sterile instruments
The maximum storage time is dependent on the packaging and the storage conditions. For standard-con-
form packaged sterilized equipment – (if protected from dust) it can amount to up to six months. Comply
with the provisions of DIN 58953, part 8 and the criteria specified below for the storage of sterilized equip-
ment:
uComply with the maximum storage duration in accordance with the packaging type.
uDo not store the sterilized equipment in the decontamination room.
uStore the sterilized equipment in a dust-protected environment e.g. in a closed instrument cabinet.
uStore the sterilized equipment in a moisture-protected environment (e.g. alcohol, disinfectant).
uStore the sterilized equipment in an environment protected against excess temperature variations.

7 Function tests
16
7 Function tests
Periodical checks
We recommend an annual inspection using bio-indicators, thermocouples or maximum thermometers.
▪ Comply with the valid regional legal specifications.
▪ When performing the spore test using biological indicators, the spore packets are to be clamped under
an instrument in order to prevent the package from being sucked into the fan motor.

8 Maintenance
17
8 Maintenance
Checks and cleaning
Check the chamber, including the door seal and chamber sealing face and the mount once a week for im-
purities, deposits or damage. If you find any impurities, remove the standard tray cassettes or cartridges
and the mount from the chamber. Clean the soiled components. When cleaning the chamber, the mount
for the load, chamber seal face and the door seal, please comply with the following:
▪ Switch off the steam sterilizer before cleaning and remove the power plug from the socket.
▪ Ensure that the chamber is not hot.
▪ Use a soft, non-fuzzing cloth.
▪ Use a chlorine- and vinegar-free cleaning fluid.
▪ First soak the cloth with the cleaning alcohol or spirit and attempt to remove the impurities with this
method.
▪ Only if the chamber, mount or chamber seal face has persistent soiling should you use a mild stainless
steel cleaning agent, with a pH value between 5 and 8.
▪ To clean the door seal, use a neutral liquid cleaning agent.
▪ You should not allow cleaning fluid to enter the piping coming from the chamber.
▪ Do not use any hard objects such as metal saucepan cleaner or a steel brush.
▪ Check the door seal for damage on a daily basis. Replace the door seal if necessary.
▪ Check the contact pressure of the door The entire surface of the door must be in contact with the frame.
NOTICE
Inappropriately performed cleaning can lead to the scratching of and damage of surfaces
and the development of leaks in sealing surfaces. This creates conditions favourble to
dirt deposits and corrosion in the sterilization chamber.
Comply with all information regarding cleaning of the part affected.

9 Malfunctions
18
9 Malfunctions
General events
Incident Possible cause What you can do
The temperature display of
the thermometer deviates
by more than 8°C than set
on the controller.
The control button has
been maladjusted.
Increase or reduce the temperature by turning
the temperature controller:
Higher temperature: anti-clockwise
Lower temperature: clockwise
The device does not switch
off. The indicator lamp
“network” and “heating”
illuminate.
The timer is defective or
is set to continuous
operation.
Check that the "On/Off switch" is set to "I" or "0".
If the timer is defective, inform an authorized
customer services.
The device can be operated provisionally on a
semi-automatic basis by actuating the "On/Off
switch" manually.
The temperature displayed
deviates from the set
temperature. The
thermometer displays less
than 180°C or falls from
180°C to c. 150°C within c.
5 min. and continues to fall.
Under circumstances, there
is no audible ventilator
noise.
The temperature has
been set too low.
The temperature
controller rotary knob was
unintentionally turned or
mal-adjusted during
unpacking or incorrect
handling e.g. during
cleaning.
Set a higher temperature.
The temperature controller must be readjusted
by a service technician. Inform an authorized
customer services.
Provisionally, turn the temperature controller so
that the desired temperature is displayed on the
device thermometer.
The device is too hot (over
180°C).
The temperature fluctuates
between 210-240°C. The
indicator lamp network is
illuminated. The indicator
lamp heating is
continuously off or on/off
every 20 seconds.
The “Temperature
controller” has been set
incorrectly or is defective.
Set the temperature controller to e.g. 180°C
and check whether this temperature has been
reached / is displayed on the thermometer (note
the heating and equilibration time).
Should values deviate, the rotary knob must be
readjusted. Task an authorized customer
services.
If the thermostat is defective, inform an
authorized customer services.
Provisionally, turn the "temperature control"
rotary knob so that the desired temperature is
displayed on the device thermometer.

10 Technical Data
19
10 Technical Data
Device type Sterilizer 255 (including 6 mountings)
Electrical power 1100 W
Electrical connection 220 - 240 V 50/60 Hz
Device fuse 2 x 6.3 A T
Noise emission 56 dB
Waste heat 1.5 MJ
Weight 22 kg
Please observe the maximum load: 6 kg including 6 trays
Maximum mains voltage supply variations: ± 10 %
Maximum voltage range 207 - 253 V
Relative humidity up to 31 °C max. 80 % | up to 40 °C max. 50 %
Degree of protection IP 20
Protection category I
Sterilization chamber (WxHxD)1) 50 x 20 x 21 cm
Dimensions (WxHxD) 62 x 32 x 39 cm
Ambient temperature 5 - 40 °C
Volume of the sterilization chamber 21 litres
1) with installed mounts

11 Accessories
20
11 Accessories
Table2: Accessories
Designation of article art. no.
Tray 02003
Tray jack 28890