Slee MEV+ User manual

DESIGN &
MANUFACTURING
MADE IN GERMANY
O P E R A T I N G
M A N U A L
CRYOSTAT
MEV +
ROUTINE CRYOSTAT

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Manual_MEV+_2021-10-012.00_EN.docx 3
CONTENTS
1. INTENDED USE
............................................................ 4
2. SYMBOLS
............................................................ 4
3. SAFETY NOTES
............................................................ 4
4. COMPONENTS
............................................................ 8
5. SPECIFICATIONS
............................................................ 9
6. UNPACKING AND INSTALLATION
............................................................
11
7. INITIAL OPERATION
............................................................ 15
8. OPERATION OF MICROTOME
............................................................
21
9. OPERATION OF CRYOSTAT
............................................................ 30
10. CLEANING AND MAINTENANCE
............................................................ 35
11. SERVICE
............................................................ 38
12. OPTIONAL ACCESSORIES
............................................................ 39
13. WARRANTY
............................................................ 40
14. DISPOSAL
............................................................ 40

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1. INTENDED USE
The floor standing open top cryostat MEV + is intended for rapid freezing and cutting
thin sections of frozen specimens for professional use in routine and research
laboratories in the fields of biology, medicine and industry.
The system of knife advance operates very reliable from 0.5 to 100 µm with trimming
function up to 750 µm. The quality of cutting of this microtome is increased by the
automatic retraction during the upstroke of the specimen, which avoids rubbing on the
disposable blades or microtome knives. This stops rapid deterioration of the disposable
blade or microtome knife.
2. SYMBOLS
Dangers, warnings and cautions are marked by this symbol
i
Special instructions regarding the operation of the
instrument are marked by this symbol
Mechanical components that can lead to injuries during
operation are marked with this symbol.
Symbol “flammable freezing sprays are prohibited”
3. SAFETY NOTES
The Slee open top cryostat MEV + is provided with the following safety features:
MEV +
Hand wheel stop
•
Finger protection for Knife- and blade-holder
•
The institution which owns the unit and the persons working with the unit, servicing or
repairing it have the responsibility for a hazard-free use.

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3.1 Hand wheel stop
Always use the finger protection
with the knife-/blade holder and put
hand wheel in stop position
•before working with the
knife or specimen
•before changing the
specimen
•during break time
Hand wheel stop released. Movement.
Hand wheel stop activated. No movement.
The hand wheel can be stopped in
any position. For this purpose move
the stop lever towards the centre.
To release the stop, please turn the
lever towards the outside again.

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3.2 FINGER PROTECTION
Always use the finger protection
•Before you start any work with
the knife or specimen
•Before changing the specimen
•During work break
Finger protection released.
Finger protection activated.

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3.3 ELECTRICAL POWER CONNECTION
Do not use any extension lead.
Make sure that electric power is constant. Make sure that electric power
is constant. Please note that the compressor requires a start-up current
between 25 and 35 A. The electric circuit at the installation site must be
inspected by an electrical engineer to ensure that it meets the
requirements for a smooth operation of the instrument.
•
This should be examined during installation of the unit by a
competent person
•Use a dedicated fuse for the unit
•Do not connect another unit to the same power circuit.
•Before turning on the instrument, check if the voltage of the mains
supply is identical with the name plate of the unit
3.4 WORKING WITH KNIVES AND DISPOSABLE BLADES
Microtome knives and disposable blades have extremely sharp edges and this can lead
to injuries.
Please be extremely careful when handling microtome knives and disposable blades.
Do not place microtome knives or disposable blades at unsecured areas.
Never position microtome knives or disposable blades with the sharp edge
pointing upwards.
Store blades in a covered container. Use a container that has guides to
hold the blades rigid.
Never try to catch a falling microtome knife.
Always insert the specimen first and then the microtome knife or
disposable blade.
To avoid compression or knife marks, ensure that the blade is clean.

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4. COMPONENTS
The Slee open top cryostat MEV + is provided with the following standard components:
MEV +
Basic unit with refrigeration system
•
Semi-automatic rotary microtome
•
Operation manual
•
Specimen holder (5x Ø 22mm; 5x Ø 35 mm)
•
clear-cut Brush
•
Object cooling
•
Quick-freeze
•
UV disinfection
•
Anti-roll plate (ready to use)
•
1x Bottle cryostat low temperature oil
•
4x 125 ml CryoGlue embedding medium
•
1 Box of disposable blades (50 pcs.) or
1 steel knife (16 cm C-profile)
•
1 Set of allen key, socket wrench and
screwdriver
•
1x Heat Extractor
•
1x Mains cable
•
2x Cover plug (black) für base
•

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5. SPECIFICATIONS MEV +
General
Nominal power 230 V AC +/-10% 115 V AC +/-10%
Nominal frequence 50 / 60 Hz 60 Hz
Power 1.350 VA 1.350 VA
Max. current for 5 sec 17 A 35 A
Protective class I I
Fuses 2 * T 10 A 2 * T 20 A
Pollution class 2 2
Overcurrent protective class II II
Max. heat energy 1.360 J/s 1.360 J/s
Operating temperature range +10 to +35 °C
Operating humidity max. rel. 80 % non-condensing
Storage temperature range +5 to +55 °C
Storage humidity max. rel. 80 % non-condensing
Cryochamber
Temperature range 0°C to -35°C, selectable in 1 K steps, environment:
20°C
Cooling power 640 W 514 W
Switch off pressure 25 bar 25 bar
Current 3,69 A 6,45 A
Cooling gas R 449 A, 320 g R 449 A, 320 g
Chamber defrost
Automatic defrost hot gas defrost, time selectable, 1-3 times per day or
manual defrost on request
Automatic stop at -5 °C chamber temperature
Freezing bar
Minimal temperature 10 K lower than chamber temperature
Number of positions 21 + 2
Quick freeze positions 2, to -55 °C (Peltier cooling)

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Microtome
Type rotary microtome, incapsulated
Thickness range 0.5 – 100 µm
Thickness settings 0 – 2 µm in 0.5 µm steps
2 – 20 µm in 1 µm steps
20 – 50 µm in 2 µm steps
50 – 100 µm in 5 µm steps
Horizontal movement 28 mm
Vertical movement 58 mm
Retraction during upward stroke 0 – 200 µm, free selectable (defined steps)
Trimming 0,5 – 750 µm, free selectable (defined steps)
Specimen orientation 8° (x and y axes), 360° (z axes)
Zero point detent x and y axis
Cryostat
Dimensions (L x W x H) 680 mm x 760 mm x 1110 mm
Weight (without accessories) 146 kg

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6. UNPACKING AND INSTALLATION
6.1 UNPACKING THE INSTRUMENT
In standard design you will receive the unit in a cardboard box standing on a wooden
pallet. The unit is equipped with four castors and two feet, adjustable in height in the
front.
i
When the instrument is delivered, check the tilt indicators and shock
watches on the packaging. If tilt indicators are activated, the shipment
was transported laying flat, was tilted at too great an angle or fell over
during transport. If the shock watches are activated, the instrument fell
over during transport. Note this on the shipping documents and check
the shipment for possible damage.
Open the cardboard box from the top and remove the accessories together with the
supporting foams. Then remove the cardboard box.
Remove the screws on the two fixation brackets that hold the instrument on the
wooden pallet.
Swing out the ramp on which the instrument can be rolled down off the transport
pallet. To ensure a safe transport two (2) people are required.
Carefully roll the instrument backwards over the ramp from the pallet and push the
instrument to the installation location on the castors
Extend the two front feet to stabilize the cryostat in its position by turning the
supporting screws counter clockwise.
For repacking use the original cases. Keep the packing material.

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6.2 INSTALLATION SITE REQUIREMENTS
The site for installation for MEV + should meet the following requirements:
•A maximum ambient temperature of 22°C
•No direct sunlight into the cooling chamber
•Mains power supply within 3 m
•No air circulation (for example by air conditioning)
•Instrument may only be used inside rooms
•The mains supply should not be connected in series with other devices, such as
multiple sockets - a separate circuit should be provided
•Hand wheel must be reached easily
•Relative humidity lower than 60%
•A minimum distance between wall and rear of the instrument of 10-20 cm
should be guaranteed
i
High room temperatures and high humidity influence the cooling
capacity of the instrument and will lead to ice forming inside the
instrument.
6.3 INSTALLATION
For opening the chamber push the window to the top.
Remove the transport security underneath the specimen holder and position the waste
tray.
After installation, wait at least 4 hours before switching on the instrument. Failure to
comply may result in severe damage to the instrument.

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The device is delivered with a
defrosting water collecting container,
which must be installed before the
device is put into operation.
First mount the metal bracket for the
defrosting water container on the right
side of the device. Loosen the screws
and hang the bracket in the screws.
Now tighten the screws.
Installation of the metal bracket for the defrost water
collector.
Place the defrosting water container in
the metal holder and connect the
defrosting water pipe and the level
sensor to the device.
Connection of the defrost water pipe and the level
sensor to the device.
i
It is necessary to install the laterally defrost container, otherwise there
may be icing on the evaporator! We recommend filling the container
with 500 ml disinfectant before initial operation.
After installation, wait at least 4 hours before switching on the instrument. Failure to
comply may result in severe damage to the instrument.

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6.4COLLAPSIBLE HANDWHEEL LEVER
The instrument is delivered with a
ready to use hand wheel lever
that is folded away for transport
reasons.
•Before you start any work
unfold the hand wheel
lever by simply pulling the
lever into a horizontal
position.
•For folding the lever back,
pull the horizontally
orientated lever and fold it
away.
Hand wheel lever in folded position.
Hand wheel lever unfolded.

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7. INITIAL OPERATION
7.1 MAIN DISPLAY
The main display will show the day and time, the
cutting thickness, the trimming thickness, the current
chamber temperature, the target chamber
temperature, the status of the quick-freeze unit
(optional) and the total electronic status of the
instrument and a cutting counter (optional).
TUE 13:05:05
CUT: 7 µm
Trim: 19µm
Cha: -20 °C (-22) QF: 0
Status:OK 0000
7.2 CONTROL PANEL
Software settings and motor operation can be
operated with the control panel on the left to side of
the instrument.
MEV + Control Panel.

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7.3 SOFTWARE SETTINGS
Press to open the Settings menu.
>
Chamber temp -20 °C
Quickfreeze Off
UV disinfection
Light Auto
To move further down in the main menu list,
press .
Retraction 5 µm
Start defrost
Contrast
>
TIME TUE 13:05:05
To move further up in the main menu list,
Press .
>
Light Auto
Light duration 10 m
Chamber incr -15 °C
Retraction 5 µm
To change values, select a setting.
Press to open the setting.
Change entries by pressing or .
Store new settings by pressing .
Light duration 10 m
>
Chamber incr -15 °C
Retraction 5 µm
Start defrost
Press to return to the main menu.
TUE 13:05:05
CUT: 7 µm
Trim: 19µm
Cha: 22 °C (25) QF: 0
Status:OK 0000

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7.4 AUTOMATIC DEFROST, DISINFECTION AND POWER SAVING SETTINGS
Press to open the Settings menu.
>
Chamber temp -20 °C
Quickfreeze Off
UV disinfection
Light Auto
Select Program settings and press to open the
menu for setting automatic defrost and power saving
times.
TIME TUE
13 05 05
Language English
Display version
>
Program settings 5 µm
Enter PIN Code 5792.
PIN Code is usually restricted to service technicians or
instrument administrators
Enter PIN
0000
Select defrosting programs 1 to 3 and set a time for
the automatic defrosting programme.
(e.g. each day at 12:00 h and at 23:00 h in this
example)
>
Defr. Start 1 12:00
Defr. Start 2 23:00
Defr. Start 3 __:__
Disinf. Req. __:__
Select temperature increase start and set a starting
time for the automatic power saving mode.
(e.g. start at 21:00 h in this example)
Disinf. delay 10 h
>
Incr. start 21:00
Incr. end 04:00
Incr. days
_ _ _ _ _ 5
6
Select temperature increase end and set a ending
time for the automatic power saving mode.
(e.g. end at 04:00 h in this example)
Disinf. delay 10 h
Incr. start 21:00
>
Incr. end 04:00
Incr. days
_ _ _ _ _ 5 6

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Select temperature increase days and set the days at
that the automatic power saving mode will be active
for 24 hours.
(e.g. Fridays and Saturdays in this example)
Disinf. delay 1 2 _ _ _ _ _
Incr. start 21:00
Incr. end 04:00
>
Incr. days _ _ _ _ 5 6 _
1-Monday 2-Tuesday 3-Wednesday 4-Thursday 5-Friday 6-Saturday 7-Sunday
Settings for disinfection parameters:
The disinfection cycle works in a semi-automated
way.
First select a time when the system will ask for a
disinfection cycle.
(e.g. at 12:00 h the instrument will ask for a
disinfection cycle).
>
Disinfec. Req. 12:00
Disin. Days
1 2 _ _ _ _
Disin. Delay 10 h
Select the days in which a disinfection cycle can be
activated.
(e.g. Monday and Tuesday in this example)
Disinfec. Req. 12:00
>
Disin. Days
1 2 _ _ _ _
Disin. Delay 10 h
1-Monday 2-Tuesday 3-Wednesday 4-Thursday 5-Friday 6-Saturday 7-Sunday
Select the delay time at which the disinfection cycle
will be activated.
(e.g. 10 hours)
After confirmation the disinfection cycle will start at
10 p.m.
Disinfec. Req. 12:00
Disin. Days
1 2 _ _ _ _
>
Disin. Delay 10 h

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7.5 List of available software settings
Chamber temperature
-35 °C to ambient
The recommended working temperature is -15 °C to -25 °C
Object cooling
ON / OFF
If the instrument is equipped with the optional
object cooling system, its function can be activated
or deactivated.
Object temperature
-50 °C to 0 °C
If the instrument is equipped with the optional
object cooling system, its function can be activated
or deactivated.
Quick-freeze
ON / OFF
If the instrument is equipped with the optional fast
cooling peltier system, its function can be activated
or deactivated.
The default setting for automatic deactivation of the
quick freeze is set to 30 minutes. The timer for
automatic deactivation can be set by an authorized
service technician.
UV disinfection
ON /OFF
If the instrument is equipped with the optional UV-
C disinfection system, its function can be activated
or deactivated.
The default setting for automatic deactivation is set
to 30 minutes. The timer can be set by an
authorized service technician.
Light
ON / OFF / AUTO
The light can be set on or off. If AUTO has been
selected, the light will switch off after the time
being set under Light duration.
Light duration
0 - 99 minutes

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Chamber Increase
For power saving, a higher temperature can be set
for defined times and/or days.
The selected temperature should be below 0 °C to avoid
damage to the microtome by freezing moisture.
Retraction
0 - 200 µm
Start defrost
Activate
A manual defrost procedure is activated.
Trim latching
ON/OFF
Contrast
Display contrast
Time
Day and Time
Language
A language can be selected out of a list of available
languages.
Display version
Display of software version.
Program settings
Upon selecting Program settings the automatic
defrost and power saving settings can be changed.