Memmert UNB 100 User manual

Universal ovens
UNB 100 - 500
UFB 400 - 500
Sterilisers
SNB 100 - 400
SFB 400 - 500
Incubators
INB 200 - 500
OPERATING INSTRUCTIONS

BASIC page 2

BASICpage 3
1. Contents
1 Contents .......................................................................................................................................3
2 General notes and safety notes ......................................................................................................4
2.1. Intended purpose when used as medical product ..................................................................4
2.2 Transport ..............................................................................................................................4
3 Installation facilities (accessories)....................................................................................................5
3.1 Subframe (accessory).............................................................................................................5
3.2 Wall bracket (accessory) ........................................................................................................5
3.3 Stackable version (accessory) .................................................................................................5
3.4 Initial start-up .......................................................................................................................6
3.5 Oven load .............................................................................................................................6
4 Technical data................................................................................................................................7
4.1 Standard equipment of BASIC ovens......................................................................................8
4.2 Material quality .....................................................................................................................8
4.3 Electrical equipment..............................................................................................................9
4.4 Supply failure ........................................................................................................................9
5 Oven construction and operation.................................................................................................10
5.1 Operating the door .............................................................................................................10
5.2 Controls and indications......................................................................................................11
5.3 Switching on.......................................................................................................................11
5.4 Setting air changes..............................................................................................................11
5.5 Setting the temperature ......................................................................................................11
6 Selecting the operating mode ......................................................................................................12
7 Normal operation ............................................................................................................12
8 Timer operation ................................................................................................................13
9 Temperature monitor and protection devices................................................................................14
9.1 Temperature limiter (TB) ......................................................................................................14
9.2 Monitor relay ......................................................................................................................14
10 Sterilisers .....................................................................................................................................15
10.1 Purpose definition for MEMMERT hot air sterilisers ..............................................................15
10.2 Note in accordance with Medical Products Guidelines..........................................................15
10.3 Guidelines for sterilisation ...................................................................................................15
10.4 Steriliser cassettes................................................................................................................17
11 Cleaning......................................................................................................................................18
12 Maintenance ...............................................................................................................................18
13 Error messages ............................................................................................................................19
14 CE Conformity Declaration ...........................................................................................................20
15 Address and customer service ......................................................................................................23
16 Index...........................................................................................................................................24

BASIC
page 4
2 General notes and safety notes
You have purchased a technically fully proven product which has been produced in Germany with the use
of high-grade materials and the application of the latest manufacturing techniques; it has been factory
tested for many hours.
In addition we guarantee the supply of spare parts over 10 years.
This mark in the Operating Instructions means:
Watch out
Important Note!
This mark on the product means:
Note Operating Instructions
Warning – oven hot when operating!
Observation of the Operating Instructions is necessary for faultless
operaton and for any possible claims under warranty. If these
Instructions are disregarded, all claims under warranty, guarantee and
indemnification are excluded!
The right to technical modifications is reserved.
Dimensional details are not binding.
2.1. Intended purpose when used as medical product
For ovens covered by the scope of the Directive 93/42/EWG (Directive of the Commission on the
harmonization of the legal regulations of the Member States on medical devices) the following intended
purpose applies:
For ovens series SNB / SFB:
The product is intended for the sterilisation of medical products with dry heat using hot air at atmospheric
pressure.
2.2 Transport
Always use gloves!
If the oven has to be carried, at least 2 persons are required to transport it.
Do not place the oven on a readily inflammable support surface!
It is important that the oven is set up accurately horizontally!

BASIC
page 5
15 cm
min.
8 cm
min.
8 cm
min.
20 cm
min.
3 Installation facilities (accessories)
The oven can be placed on the floor or on a
bench (working surface). It is important that
the oven is set up accurately horizontally; the
door may have to be adjusted (see Section
„Maintenance“)
The spacing from the back of the oven to the
wall should be at least 15 cm. The spacing to
the ceiling must not be less than 20 cm and
that at the side to the wall not less than 8 cm.
Generally it is essential to have adequate air
ventilation around the oven.
Information on accessories will be found in our leaflet or on our internet page www.memmert.com.
Please note the installation instructions for our accessories.
3.1 Subframe (accessory)
Oven model 500 can be mounted on a subframe
3.2 Wall bracket (accessory)
Oven models 200 to 500 can be wall-mounted using the wall bracket. The wall
bracket is factory-fitted with a fire-resistant plate. The size and length of the
screws used and of the corresponding dowel plugs depend on the total weight
(oven plus load) and vary with the condition of the wall.
3.3 Stackable version (accessory)
Two ovens of the same model size can be stacked on each other. Note that
the oven with the lower working temperature must always be placed at the
bottom.
Foot locators have to be fitted on the bottom oven.
!" Take off cover of bottom oven
!" Place drill jig (supplied with foot locators) into the inverted cover at the back
!" Mark holes and drill 4.2 mm dia.
!" Screw the foot locators to the top of the cover using the screws and
nuts supplied
!" Re-fit the cover

BASIC
page 6
3.4 Initial start-up
When the oven is started up for the first time, it should be supervised continuously until steady conditions
have been reached. Severe vibrations during transport may cause movement of the temperature probe in
its holder inside the chamber. Note therefore that before the first start-up the temperature probe should
be checked for its correct position and, if necessary, carefully aligned in its mounting (see ill).
3.5 Oven load
Full consideration must be given to the physical and chemical properties of your load (e.g. combustion
temperature etc.) in order to prevent serious damage to load, oven and surroundings.
Please note that the MEMMERT ovens described here are not explosionproof (they do not conform to the
Industrial Association Specification VBG 24) and are therefore not suitable for drying, evaporating and
burning-in of paints, enamels or similar materials whose solvents may produce an inflammable mixture
with air. There must be no possibility of the formation of inflammable gas/air mixtures either within the
oven chamber or in the immediate surroundings of the equipment.
Large amounts of dust or corrosive fumes inside the oven chamber or in the surroundings of the equipment
may produce deposits within the oven and lead to short-circuits or damage the electronics. It is therefore
important that adequate precautions are taken against excessive dust or corrosive fumes.
In order to ensure proper air circulation inside the chamber, there must be sufficient spacing of the load
inside the oven. Do not place any load on the floor, against the side walls or underneath the ceiling of the
chamber (heating ribs). In order to ensure optimum air circulation the shelves must be so inserted that the
air spacings between door, shelf and rear chamber wall are approximately equal.
The maximum number and the loading of the shelves can be found in the table in the Section „Technical
Data“. With unfavourable loading (too closely spaced) and completely opened ventilation it is possible that
the set temperature may be reached only after a longer period of time.
See stick-on label “Correct Loading“ on the oven!
Ill: Chamber ceiling with Pt 100 metal temperature probe

BASIC
page 7
4 Technical data
Model 100 200 300 400 500
Chamber width A [mm] 320 400 480 400 560
Chamber height B [mm] 240 320 320 400 480
Chamber depth C [mm] 175 250 250 330 400
Oven width D [mm] 470 550 630 550 710
Oven height E [mm] 520 600 600 680 760
Oven depth F [mm] 325 400 400 480 550
Chamber volume [litre] 14 32 39 53 108
Weight [kg] 20 28 30 35 50
Power, ovens UNB/UFB/SNB/SFB [W] 600 1100 1200 1400 2000
Power, ovens INB [W] 300 440 500 800 900
Max. number of trays 2 3 3 4 5
Max. load per tray [kg] 10 30 30 30 30
Total load per oven [kg] 20 30 30 90 60
Ambient conditions Ambient temperature 5°C to 40°C
rH 80% max., no condensation
Overvoltage category: II
Contamination level: 2
Setpoint temperature range 20°C to nominal temperature (details see label)
Setting accuracy 0,5°C
Indication resolution 0,5°C
Working temperature range From 5°C above ambient temperature up to nominal
temperature = maximum temperature (details see label)
On ovens with fan (UFB/SFB) from 10°C above ambient
temperature up to nominal temperature = maximum
temperature (details see label)
Supply plug

BASIC page 8
4.1 Standard equipment of BASIC ovens
!" Electronic PID controller with permanent power matching, auto-diagnostic system for rapid fault
finding (see Section “Error messages“)
!" Manually adjustable air valve for recirculation or fresh air operation
!" Programmable electronic switch-off timer up to 99 h 59 min
!" Recessing push/turn control for simple operation of oven
!" Visual alarm indication
!" Monitor relay to switch off heating in case of fault
!" Mechanical temperature limiter (TB Class 1)
!" High-grade PT100 temperature sensor Class A in 4-wire circuit
!" Special equipment (to be ordered separately as accessories): subframe, wall bracket, sterilisation
cassette
4.2 Material quality
For external housing MEMMERT employs stainless steel (Mat.Ref. 1.4016). The chamber is made from
stainless steel (Mat.Ref. 1.4301) which exhibits high stability, optimum hgygienic properties and corrosion
resistance against many (not all) chemicals (warning against e.g. chlorine compounds).
The oven load has to be checked carefully for its chemical compatibility with the above materials.
A compatibility table covering all these materials can be requested from MEMMERT.

BASIC
page 9
4.3 Electrical equipment
!" Operating voltage see label 50/60 Hz
!" Current rating see label
!" Protection Class 1, i.e. operating isolation with ground connection to EN 61 010
!" Protection IP20 to EN 60 529
!" Interference suppression to EN55011 Class B
!" Oven protected by a fuse 250V/15A fast blow
!" Controller protected by an 80 mA fuse (200 mA on 115 V)
!" When connecting a MEMMERT oven to the electrical supply you have to observe any local
!" regulations which apply (e.g. in Germany DIN VDE 0100 with FI protection circuit)
This product is intended to operate on a supply network with a system impedance Zmax at the
transfer point (building connection) of 0.292 Ohm max. The user has to ensure that the product is
only operated on an electrical supply network which meets these requirements. If necessary, details
of the system impedance can be obtained from the local electricity supply authority.
Note:
Any work involving opening up the oven must only be carried out by a suitably qualified
electrician!
4.4 Supply failure
After a failure of the supply, operation is continued with the same parameter settings.
WARNING! Always pull out the supply plug before opening the oven
cover!

BASIC
page 10
5 Oven construction and operation
Ovens Series UNB, INB and SNB have natural ventilation.
In Series UFB amd SFB ovens, air circulation is provided by a fan on the back wall of the chamber.
The incoming air (1) is warmed in a preheat chamber (2) in both convection and fan-circulation ovens. The
preheated air enters the chamber (4) through ventilation slots (3) in the chamber side wall. The fan (5) on
the chamber back wall produces a large air throughput and a more intensive horizontal forced circulation
compared with natural convection. The air valve (6) on the back of the oven controls the rate of air intake
and discharge (air change) (7).
5.1 Operating the door
The door is opened by pulling on the door handle.
The door is closed by the door handle being pushed in.
1
air supply
fresh air
7
air discharge
5
fan
6
air valve
4
chamber
3
ventilation slots
2
preheat chamber
open
close

BASIC
set
off
on
Th Fr Mo Tu We Sa Su t3
t2
t1
STERI DEFRO
PRINT SETUP
loop
t4 3
4
2
1
°C rh
mb
%CO
mb
2
IN 1 IN 2 OUT IN 1 IN 2 OUT
MIN
AUTO
MAX
°C
h
on
off
page 11
5.2 Controls and indications
5.3 Switching on
The oven is switched on by pressing the push/turn control.
5.4 Setting air changes
Moving the air slider opens and closes the air valve to control the supply and discharge of air.
5.5 Setting the temperature
Hold down the SET key and set the temperature setpoint with the push/turn control.
After the SET key has been released the display briefly flashes the temperature setpoint. The display then
changes to the actual current temperature and the controller starts to control to the selected temperature
setpoint.
Oven switched off. The push/turn control is pushed
in and protected against damage
Oven switched on and can be operated using the
push/turn control and the SET key.
Air valve closed Air valve open
push/turn control
(main switch)
set-key air slider
temperature displayoperating mode
indication
timer display alarm indicationheating
Ill : UNB 500

BASIC page 12
6 Selecting the operating mode
After holding down the SET key (approx. 3 sec), the current operating mode flashes on the display. A
different operating mode can be selected with the push/turn control while the SET key is being held down.
After the SET key has been released the controller operates in the new operating mode.
7 Normal operation
In this operating mode the oven operates continuously and heats and controls to the set temperature. On
the ovens UFB/SFB the fan is running continuously.
Setting the temperature:
Hold down the SET key and set the required temperature setpoint with the push/turn control.
After the SET key has been released the display flashes briefly the temperature setpoint.
The display then changes to the actual current temperature and the controller starts to control to the
selected temperature setpoint.
˚C
h
Normal
operation
Timer
operation

BASICpage 13
8 Timer operation
In this operating mode the oven operates on the timer; it heats/controls to the set temperature and maintains
this temperature until the set time has elapsed. The clock symbol is flashing during timer operation, then
the heating is switched off; on UFB/SFB ovens the fan runs on for 30 minutes. The timer display shows END.
- The time can always be set to OFF, the heating is then switched off and the timer display shows END.
- Time is counted down, it is always possible to see how long the oven will remain switched on.
Setting the temperature:
Turn the push/turn control clockwise until the temperature display is flashing.
Hold down the SET key and set the required temperature setpoint with the push/turn control.
After the SET key has been released the oven flashes briefly the temperature setpoint. The display then
changes to the actual temperature and the controller starts to control to the selected temperature
setpoint.
Setting the timer:
Turn the push/turn control anticlockwise until the timer display is flashing.
Hold down the SET key and set the required operating time with the push/turn control.
˚C
h
Example: the oven heats and controls at 180°C for 45 minute duration.
(time is counted backwards)

BASIC page 14
9 Temperature monitor and protection devices
9.1 Temperature limiter (TB)
All ovens of the BASIC series are equipped with a mechanical temperature limiter (TB) Protection Class 1
to DIN 12 880.
If the electronic monitor system should fail during operation and the fixed factory-set maximum temperature
is exceeded by approx. 20°C the temperature limiter switches off the heating permanently as a final
protective measure. The alarm symbol lights up as warning.
Fault rectification after the TB cut-out has been activated:
1. Switch off the oven and allow it to cool down
2. Rectify the fault (e.g. replace temperature probe) and where appropriate contact customer service
3. The oven is again ready for operation only after it has cooled down and after the fault has been
rectified.
9.2 Monitor relay
In addition to mechanical temperature protection the oven is provided with an electronic monitor relay.
If a fault occurs during operation or if the selected setpoint temperature is exceeded (by 3°C on ovens Series
INB, by 10°C on ovens UNB/UFB/SNB/SFB) the monitor relay switches over the heating to this temperature
in emergency mode. The alarm symbol is flashing as warning.
Fault rectification after the monitor relay may been activated:
Check the controller for error messages (see Section „Error messages“) and where appropriate contact
customer service.
TB approx. 20°C above
monitor relay approx. 10°C above setpoint
setpoint
220°C
150°C
20°C
t
°C
control fault
emergency mode
Example: UFB500:
With a setpoint temperature of 150°C, if a
fault occurs in the power unit (faulty triac)
the oven continues to operate in emergency
operation at approx. 160°C.

BASICpage 15
10 Sterilisers
10.1 Purpose definition for MEMMERT hot air sterilisers
The oven SNB/SFB is intended for the sterilisation of medical materials by dry heat using hot air at atmospheric
pressure.
10.2 Note in accordance with Medical Products Guidelines
The product lifetime specified by the manufacturer is 8 years.
10.3 Guidelines for sterilisation
For hot air sterilisation there are different regulations covering the temperature settings and the sterilisation
times, as well as the packaging of the products to be sterilised. The values depend on the type and condition
of the load to be sterilised and on the type of bacteria which have to be de-activated. Please make yourself
familiar with the sterilisation method laid down for your application before carrying out sterilisation using
your MEMMERT cabinet.
The operation of the MEMMERT hot air steriliser is also subject to the Standard DIN 58 947 Part 6.
A few examples of the correct preparation for different medical products are summarised in the following
table:
Load Preparation
Instruments (no soft solder) load cleaned instruments, wrapped twice in aluminium foil or in
steriliser foil suitable for hot air (recommended)
Cutting instruments load cleaned instruments, wrapped twice in aluminium foil or in
steriliser foil suitable for hot air (recommended)
Syringes (no plastics) load plunger and cylinder separately, wrapped twice in aluminium
foil or in steriliser foil suitable for hot air (recommended)
Glass and glass instruments dismantle cleaned glass vessels and all-glass syringes and place into
dishes, cool down slowly
Bottles, vessels and similar items must be sterilised without closure and with the opening downwards, in
order to avoid the formation of cold air pockets. The recommended sterilisation temperature is usually
180°C (German Pharmacopoeia DAB 10)

BASIC page 16
The total sterilisation time to be selected consists of the heating-up time (i.e. the time until the desired
temperature has been established within the entire steriliser chamber), the actual sterilisation time, and a
safety margin.
The following table gives typical values for the total sterilisation time to be set, with different amounts
of load, for sterilisers with and without fan. Please note that these values can be employed only with
correct and loose distribution of the load. Notes on the correct loading of the steriliser can be found in
these Operating Instructions and also on the label affixed to the steriliser. In case of unfavourable loading
heating-up time could increase considerably.
Sterilisation
temperature: 180°C
heating-up time +
sterilisation time =
total sterilisation time
Type of loading:
light medium heavy
Steriliser size without fan with fan without fan with fan without fan with fan
100 0:45 h +
0:45 h =
1:30 h
---- 0:45 h +
1:15 h =
2:00 h
---- 0:45 h +
1:45 h =
2:30 h
----
200 0:45 h +
0:50 h =
1:35 h
---- 0:45 h +
1:20 h =
2:05 h
---- 0:45 h +
1:50 h =
2:35 h
----
300 0:45 h +
0:50 h =
1:35 h
---- 0:45 h +
1:20 h =
2:05 h
---- 0:45 h +
1:50 h =
2:35 h
----
400 0:45 h +
1:15 h =
2:00 h
0:30 h+
1:00 h =
1:30 h
0:45 h +
1:50 h =
2:35 h
0:45 h +
1:20 h =
2:05 h
1:00 h +
2:00 h =
3:00 h
0:45 h+
1:50 h =
2:35 h
500 0:45 h +
1:15 h =
2:00 h
0:30 h +
1:00 h =
1:30 h
0:45 h +
1:50 h =
2:35 h
0:45 h +
1:20 h =
2:05 h
1:00 h +
2:00 h =
3:00 h
0:45 h +
1:50 h =
2:35 h
The sterilisation time is increased by a factor of 4 when sterilising at a temperature of 160°C.
On large sterilisers and with heavy loading it is recommended to use wire shelves (special accessory) instead
of perforated shelves.
sterilisation time
heating-up time
total sterilisation time
180°C
°C
t

BASIC
1
2
page 17
Especially with heavy loading of the steriliser it is not sufficient to use these typical values without further
tests. Reliable sterilisation requires validation of the individual sterilisation process, e.g. with the aid of
additional temperature probes or by using biological or chemical indicators.
Note:
In sterilisation processes the vent valve on the oven must be closed after the moist
sterilisation load has been dried!
10.4 Steriliser cassettes
The cassettes should preferably be so arranged in the steriliser that the hot air flow can pass readily through
the air slots.
The load to be sterilised is placed into the steriliser cassettes wrapped in aluminium foil or in steriliser foil
suitable for hot air (as in the Table in the Section „Guidelines for sterilising“). The air slots in the cassette
must be open during sterilisation.
A temperature probe to confirm the temperature of the load can be introduced through the opening (2).
After sterilisation has been completed the air slots must be closed by moving the slide knob (1).
The sterilised and packed load can then be stored briefly in the closed cassette.

BASIC
12
3
4
6
5
page 18
11 Cleaning
Regular cleaning of the easy-to-clean inside of the chamber prevents deposits which over time can detract
from the appearance and the functionality of the stainless steel chamber .
The metal surfaces of the oven can be cleaned with commercially available cleaning agents for stainless
steel. It is important to ensure that no rust-forming object comes into contact with the chamber or the
stainless steel casing. Rust deposits cause infection of the stainless steel.
If any contamination causes rust stains on the surfaces of the chamber, such spots must be cleaned off
immediately and the area polished.
The control panel, the plastic input modules and other plastic components of the oven must not be
cleaned using scouring cleaning agents or those contained solvents.
12 Maintenance
Important for a long life of your MEMMERT product and in case of warranty claims.
Note:
Any work involving opening up the oven must only be carried out by a suitably qualified
electrician!
MEMMERT products require little maintenance. It is however recommended to lubricate all moving parts
of the doors (hinges and closure) once a year (or 4 times a year with continuous operation) using a thin
Silicone grease, and to check that the hinge screws are tight.
A well-closing door is essential on an oven. On Memmert ovens, tight closure of the door is ensured by a
seal on the oven and another one on the door. In continuous operation the flexible sealing material may
take a permanent set. Readjustment may then be necessary
in order to ensure proper closing of the door.
!" The top part (1) of the door hinge can, after releasing
the 2 screws (2) at the top or bottom of the door, be
moved slightly in the direction of the arrow.
!" The door can be adjusted after releasing the socket
screw (3) and rotating the excentric (4) by means of
a screwdriver. NOTE ! Screw (3) is locked with locking
varnish. It can be released by a sharp tug using a
hexagon socket key. Apply more locking varnish to
screw (3) and tighten it.
The closing panel (6) can also be adjusted in the direction of
the arrow after releasing the screw (5). It is important that
the panel is then screwed down firmly.

BASICpage 19
13 Error messages
E-0 Error on self test
E-1 Power module triac faulty
E-2 Power module faulty
E-3 PT100 temperature probe faulty
In case there is a fault on the oven, please get in touch with an authorised service organisation
or contact the MEMMERT customer service department.
When dealing with the service department always quote the product serial number on the oven label.

BASIC page 20
14 CE Conformity Declaration
EC Declaration of Conformity
Manufacturer´s name and address: MEMMERT GmbH + Co. KG
Äußere Rittersbacher Straße 38
D-91126 Schwabach
Product: Universal oven
Type: UNB … / UFB … / UNE ... / UFE … / UNP … / UFP …
Sizes: 100 / 200 / 300 / 400 / 500 / 550 / 600 / 700 / 800
Nominal voltage: AC 230 V or 3 ~ AC 400 V 50 / 60 Hz
alternative AC 115 V 50/60 Hz
The designated product is in conformity with the European EMC-Directive
2004/108/EEC
including amendments
Council Directive of 03 May 1989 on the approximation of the laws of the Member States relating to
electromagnetic compatibility.
Full compliance with the standards listed below proves the conformity of the designated product with the essential
protection requirements of the above-mentioned EC Directive:
DIN EN 61326:2004-05 EN 61326:1997
EN 61326/A1:1998
EN 61326/A2:2001
EN 61326/A2:2003
The designated product is in conformity with the European Low Voltage Directive
2006/95/EEC
including amendments
Council Directive on the approximation of the laws of the Member States relating to Electrical
equipment for use within certain voltage limits.
Full compliance with the standards listed below proves the conformity of the designated product with the essential
protection requirements of the above-mentioned EC Directive:
DIN EN 61 010-1 (VDE 0411 part 1):2002-08 EN 61 010-1:2001
DIN EN 61 010-2-010 (VDE 0411 part 2-010):2004-06 EN 61 010-2-010:2003
Schwabach, 03.07.08
______________________________
(Legally binding signature of the issuer)
This declaration certifies compliance with the above mentioned directives but does not include a property assurance. The
safety note given in the product documentation which are part of the supply, must be observed.