MELAG Type 215 Bedienungsanleitung

page 1

Operating Instructions

HOT- AIR STERILIZERS

DRYING CABINETS

Models with

Mechanical Air Movement

Type 215 Type 225 Type 255

Sterilization - Disinfection

Sterilization means to free objects from breedable

microbes; in the process not only the vegetative, but

the resistive forms of germs must be eliminated.

Sterilization by hot air requires a minimum

temperature of 180°C (German DIN 58947). During

sterilization, spores of type A, B, C, D (according to

the German federal public health department) or

spores of resistivity level III (according to Prof.

Konrich) have to be killed.

The only result of disinfection is that an object

cannot disinfect any more. It is then free from

vegetative forms of disease-causing agents, but not

free from bacterial spores.

Medical instruments which come into contact with

blood or which injures the integrity of human body

surface, must therefore always be sterilized before

use (tetanus and danger of gangrene infection) –

disinfection is not sufficient.

What can be sterilized in hot-air?

In hot-air, it is possible to sterilize objects made of

incombustible (inorganic) materials, such as metal,

glass, porcelain, stoneware, enamelware, etc., e.g.

instruments, syringes, cannulas, and so on (pay

attention to the manufacturer's instructions). After

use, the instruments, syringes, etc. should

immediately be disinfected and then thoroughly be

cleaned. Before placing them in the sterilizer, the

items have to be dried. Do not place items on

cellulose because this might lead to build-up of heat

and thus to an obstruction of heat egalization in the

apparatus.

page 2

1. Operation of the apparatus

Set up the temperature regulator (1) to the sterilizing

temperature of 180°C. If the indicated value for

temperature is different from the one set up, check

for a possible adjustment of the regulating knob (see

"Hints for fault corrections" below).

1.1. Switching on power_______________________________________________

The apparatus' with timer is switched on by adjusting

the timer (5) to the time given in the operating time

table. The permanent switch (6) of sterilizers of type

215-255 must always be in position "0", if the timer is

in operation.

For longer processes (or if the timer is defective),

power can be switched on by using switch (5) for the

required time. The timer is out of operation. By

turning the timer knob counter-clockwise (to the left

to "I"), the sterilizer is turned on for permanent

operation.

The light of signal lamp (4) indicates that power is

on.

The signal lamp (2) optically shows the automatic

working procedure of the temperature regulator. It

keeps the adjusted temperature to a constant level

by turning the heating on or off (not current in

general). Lamp (2) goes on and out respectively.

1.2. Switching off power ______________________________________________

The apparatus is automatically switched off at the

end of the timer (5).

If a sterilization process was carried out by using the

permanent switch (6), set it back to position "0".

Permanent operation of sterilizers of type 71 and

type 91 is ended (timer in position "I") by setting the

timer knob back to "0". Both signal lamps (2 and 4)

go out if power is turned off.

1.3. Mechanical Air Movement__________________________________________

Sterilizers with mechanical air movement have

motor-driven fans which are automatically switched

on by the turning on of power and switched off re-

spectively.

1.4. Drying procedure_________________________________________________

Set up temperature to 100°C by turning the regula-

tion knob. Shake out pipettes to be dried and lay

them in not too wet and – if possible – a little sloping.

Escape of damp air is possible as follows:

As far as sterilizers of type 215-255 are concerned,

the door can be engaged into a position of the door

hinge where the door will be kept open to enable the

drying process.

2. Description of the apparatus

2.1. Front view_______________________________________________________

Type 215 - 255

Thermostat

Thermometer

Timer - On-Off Switch

Signal lamp heating

Signal lamp main

Permanent switch

Operating Instructions

page 3

Table of Operating Times

Apparatus

Type

Maximum load

(without basket/trays)

Mechanical

air movement

215 / 225 / 255 3,0 kg 70 Min. (3 trays)

85 Min. (6 trays)

The given operating times are based on sterilizations

of medical instruments with trays or open containers.

Sterilization processes with closed containers need

longer operating times (see below).

Use containers from aluminium not stainless steel

container. Determine the additional time by a test

run. The safety margin should be 10%.

2.2. German VDE-requirements _________________________________________

In accordance with the valid VDE-requirements, this

autoclave is not suitable for areas with danger of

explosion.

It may be repaired only by the manufacturer or a

licensed service unit.

3. Attention! Warning

•Before opening the door switch off the appliance,

either using the main switch (6) or by turning the

time switch (5) to “0”. The signal lamp (4) is no

longer on.

•Be careful when loading and unloading the hot

sterilizer. Trays and sterilised items are hot!

•The ventilator only comes to rest some 45 secs

after switching off the appliance.

•During and after the sterilisation process some

parts of the housing may become very hot and

could cause burns. Danger!

•This appliance is not suitable for the sterilization

of liquids and for the warming up of rinse

solvents !

4. Attention! Misoperation

The hot-air sterilisszation method is fully accepted

(German DIN 58947). Nevertheless, this method is

still criticized because bacteriological examinations

about hot-air sterilizers still show a growth of testing

germs. A more detailed examination demonstrates

that this fact is mostly caused by misoperation.

5. Fault No. 1: Operating time too short!

The operator assumes the correct fact that a tem-

perature of 180°C for a period of 30 minutes takes

effect on the items to be sterilized. But the fault lies

in the exclusive observation of the thermometer. As

soon as the thermometer shows a temperature of

180°C, the operator wrongly begins to count the 30

minute period after which the sterilizer can be

switched off. This procedure only considers the pre-

heat time but not the equalization time. It is wrong to

assume that the killing time starts immediately after

the conclusion of the pre-heat time. Between killing

and pre-heat time, the operator has to take the

equalization time into account. This is the time

needed for the required temperature reaching all

places of the apparatus and of the items to be steril-

ized. Only after conclusion of the equalization time

the killing time begins which endures 30 minutes

(with 180°C). This period contains an extra charge

for safety (German DIN 58947, part 5).

All these conclusions of times are included in the

operating times given above (see table). The operat-

ing times are based on sterilizations of medical

instruments under use of trays or open containers.

Sterilization processes with closed containers need

longer operating times. If the items are sterilized in

closed cassettes made of aluminium with thin walls,

the operating times have to be elongated for 15

minutes. On principle, we recommend not to use

closed containers. For example, we have measured

a temperature of only 160°C inside of plates after 3½

hours!

page 4 Rev. 2 – 99/0233 BA_GB_215_225_255.doc

6. Hints about fault corrections

6.1. Timer does not automatically switch off power ________________________

If the timer is defective, the sterilizer can still be

operated in a half-automatic way with the help of the

permanent switch (6). Before exchange of the timer,

it is absolutely necessary to pull out the main plug.

Loosen the screw of the timer knob and remove the

knob. Unscrew the front scale plate and remove it

with care. Then remove the stick hulls of the cable

ends from the flat plugs of the timer and unscrew the

timer from the front scale plate. Connect and install

the new timer in the same way.

A new timer can only be ordered at specialist shops.

For quick completion, it is necessary to know the

type of sterilizer and its work number.

6.2. Temperature set up with the regulation knob does not tally with

indication of the thermometer _______________________________________

Hot-air sterilizers from MELAG are delivered with

temperature calibrated at 180°C by adjusting the

regulator axis so that the thermometer really

shows a value of 180°C. Then the thermostat

knob is sticked on the axis so that the white

indicator of the knob points to the 180°C- mark on

the scale. In this position, the thermostat knob is

fixed to its axis by fastening the clamp screw.

If the thermostat knob is unintentionally be turned

with force beyond the resistance due to improper

treatment, e.g. during cleaning or unpacking of the

gadget, or if the screw is loosened in the taper, the

knob can slip on the regulator axis. Respectively,

the real temperature inside the vessel (indicated

on the thermometer) is different from the one set

up on the regulator scale.

A quick correction can easily be achieved by

turning the thermostat knob either little clockwise

in order to obtain a higher temperature, or

counter-clockwise for lower temperature. Provi-

sional markings on the scale will help adjustment.

A correct calibration is carried out as follows:

Remove the grey cap from the thermostat knob.

After loosening the clamp screw below, the knob

can be removed from the axis. Close the door and

switch on the sterilizer. Now adjust the tem-

perature regulator by turning the axis (perhaps

with small pliers) so that the thermometer shows

the desired temperature (e.g. 180°C) after con-

clusion of pre-heat and equalization time. Put the

thermostat knob back on the axis so that the white

indicator points to a value on the scale which

agrees with the temperature shown on the

thermometer. Finally screw the knob's screw tight

without changing the position of the axis.

6.3. The appliance does not heat up _____________________________________

If your hot air steriliser does not work, check the

internal fuses. To change fuses, first disconnect

the appliance from the mains power supply. Press

down the tongue on the fuse container on the rear

side of the oppliance and pull the container out.

Inspect the fuses and exchange if necessary.

If the signal lamp (4) does not light up to show that

the power is on, check the cable, power socket,

and mains fuse.

If the signal lamp (4) lights up but not signal lamp

(2), check the setting of the control knob (see 1.

above).

7. Appendix

7.1. Spare parts ______________________________________________________

Article No.

Description

32985

door seal (type 215-225)

92995

door seal (type 255)

32890

thermostat

32930

timer

33470

thermometer

16450

mains fuse 6,3A 2x

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