Thermo Scientific VT 6060 M-BL User manual

USA
GB
Valid: 12.2015 / 50041981 J
Vacuum Drying Oven
VT 6060 M-BL / VT 6130 M-BL
Operating instructions

2/45 50041981 J
Internet: www.thermoscientific.com
© 2015 Thermo Electron LED GmbH, 63505 Langenselbold, Germany
If translated versions of this manual are used, the German version is the authoritative basis.
Subject to technical modifications.

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WARNING NOTES
•Caution: General hazard area!
•Caution: Hot surface!
AMBIENT OPERATING CONDITIONS
•For indoor use only
•For altitudes up to 2000 m above sea level according to EN 61010
•At altitudes up to 300 m above sea level the factory setting is sufficient. At altitudes above
sea level 300 m special settings are required. This applies even if the site is changed in
terms of height. The device must then be reset by the Thermo service organization.
•Temperature range from 5 °C to 40 °C
•Maximum relative humidity: 80 %, for temperatures up to 31 °C, decreasing linearly to
50 % relative humidity at 40 °C
•Main power supply: Voltage fluctuations not to exceed +/- 10 % of the nominal value
ELECTRICAL DATA
•Overvoltage category: II
•Contamination level: 2

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These heating cabinets must be operated in accordance with the instruction manual and may only
be used for their intended applications in order to ensure the safety of personnel, the environment
and the processed items and materials.
Read the instruction manual carefully before using the equipment and comply with the instructions
that it contains to avoid making mistakes and to prevent any personal injury or damage to property.
CONTENTS PAGE
1. GENERAL SAFETY INSTRUCTIONS ............................................................................. 7 - 10
Explanation of icons ................................................................................................................ 7
General information ................................................................................................................ 8
Operating instructions ............................................................................................................. 8
Log Bock ......................................................................................................................... 8
Safety instructions ............................................................................................................ 9 - 10
2. FIELD OF APPLICATION ..................................................................................................... 11
3. UNIT SPECIFICATION ....................................................................................................12 - 24
Operating principle ........................................................................................................ 12 - 14
Construction .......................................................................................................................... 15
Safety devices ............................................................................................................... 16 - 19
PE terminal, safety extra-low voltage ............................................................................ 16
Overtemperature protection device ............................................................................... 16
Implosion protection feature in the oven door ............................................................... 16
Relief valve .................................................................................................................... 17
Minimum ignition pressure protection device ................................................................ 17
Emergency inertization facility ....................................................................................... 17
Switch room ventilation ................................................................................................. 18
Accessories ........................................................................................................................... 19
Control panel ................................................................................................................. 20 - 26
Power switch ................................................................................................................. 20
Emergency inertization - manual shut-off valve ............................................................ 21
Vacuum - manual shut-off valve .................................................................................... 21
Interlocking the manual emergency inertization shut-off valve with the
vacuum shut-off valve .............................................................................................22 - 23
Pressure indicator ......................................................................................................... 23
Start button for the heat treatment process .................................................................. 24
Fine inert / process gas metering valve ........................................................................ 24
.........................................................................................................................................25
Kelvitron®temperature controller .................................................................................. 26
Overtemperature protection device ............................................................................... 27
4. SETUP AND INSTALLATION .........................................................................................28 - 33
Transport.................................................................................................................................28
Unpacking ............................................................................................................................. 28
Installation ............................................................................................................................. 28
Under-table installation ................................................................................................. 28
Mobile support frames ................................................................................................... 28
Minimum clearances to adjacent surfaces / objects ..................................................... 29
Hazardous area ZONE 2 ............................................................................................... 29
Ventilation ............................................................................................................................. 30

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CONTENTS PAGE
Exhaust gas system .............................................................................................................. 30
Installation ............................................................................................................................. 31
Mains connection ........................................................................................................... 31
Inert / process gas connector ........................................................................................ 31
Connecting the vacuum pump system .......................................................................... 32
Connecting the emergency supply of inert gas ............................................................. 33
Inserting the trays .......................................................................................................... 33
Removing the trays ........................................................................................................ 33
5. OPERATION....................................................................................................................34 – 38
Starting up ............................................................................................................................. 34
Operation ............................................................................................................................... 35
Shutdown ............................................................................................................................... 36
Operating guidelines ..................................................................................................... 37 –38
6. MAINTENANCE.............................................................................................................. 39 – 41
Serving .................................................................................................................................. 39
Oven door ...................................................................................................................... 39
Door Seal ....................................................................................................................... 40
Cleaning ................................................................................................................................ 40
Decontamination / disinfection .............................................................................................. 40
Test ....................................................................................................................................... 41
Repairs ...................................................................................................................................41
Replacement of the electrical /electronic components .................................................. 41
Approved spare parts and accessories ......................................................................... 41
7. TECHNICAL DATA ........................................................................................................42 – 43
8. DISPOSAL AND REPAIR .......................................................................................................44
LOG BOOK ......................................................................................................................... 45

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1. GENERAL SAFETY INSTRUCTIONS
EXPLANATION OF ICONS
This symbol marks chapters and sections of this instruction manual which are particularly rel-
evant to safety.
When attached to the unit, this symbol draws attention to the relevant section of the instruc-
tion manual.
Marks information about optimum utilization of the unit in the instruction manual.
Information about optimum utilization of the unit in terms of proper disposal / recycling in
the instruction manual.
Overtemperature protection device, selector thermal cut-off
Interlock release - overtemperature protection device
Start, heat treatment process
Fine inert/process gas metering valve
Manual shut-off valve, emergency inertization
Manual shut-off valve, vacuum
Valve open
Valve closed

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EN 61010-1
EN 61010-2-10
EN 62233
EN 61326
1. GENERAL SAFETY INSTRUCTIONS
GENERAL INFORMATION
The laboratory vacuum drying oven fulfils the following standards:
Certifications: TÜV Nord declaration of conformity number TÜV 10 ATEX 556042 X.
Labeling: II 3/- G IIB T4.
Every oven is subjected to function and safety tests before leaving the factory.
This instruction manual contains information on items of equipment which are available with
certain versions of the unit (options and accessories)
The unit is factory set for sites from sea level to 300 m above sea level.
This setting must be adjusted by the thermal service organization, if ...
•the sites above 300 m above sea level lies or
•the altitude of site will be changed.
The German version of the instruction manual applies in the event of any deviations in the
translation.
Always quote the data on the rating plate when requesting information or ordering spare parts.
OPERATING INSTRUCTIONS
The operator must provide anybody working on or with this equipment with written instructions
for any operations to be performed. Such instructions must be easy to understand and must be
available in the language of the respective personnel.
Inspection intervals must be stipulated for the oven and its safety devices. This inspection must be
conducted by a qualified agency (authorized Thermo service personnel) at least once a year.
LOG BOOK
We particularly recommend that a log book is kept for this type of oven in the light of its special operat-
ing principle and the work performed with it.
All tests and calibrations performed on the unit must be recorded in this book, as well as any other
work (e.g. repairs, modifications, etc.). (The appendix contains a proposal for a suitable form.)

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2. FIELD OF APPLICATION
The vacuum drying oven has been designed as an item of laboratory equipment for ap-
plications involving heating and vacuum:
Inner chamber capacity: 53 liters (VT 6060 M-BL) or 128 liters (VT 6130 M-BL)
Operating temperatures up to 200 °C
Achievable Final vacuum (depending an the pump) up to 0.01 mbar
The unit has been designed for Installation and Operation in the following fields:
Laboratories, e.g. in the commercial or industrial sector, schools, universities, hospitals, etc.
For the following applications:
heat treatment under reduced or modified atmospheric conditions
particularly gentle drying of heat-sensitive materials, e.g. raw vegetable materials
drying of materials which have a complicated structure (e.g. capillaries, cavities, undercuts,
aging under reduced atmospheric conditions
drying granular materials / porous structures with low residual moisture
gentle heat treatment of powdery active ingredients, tablets,
paraffin embedding
steaming out artificial resins
heat treatment of materials which contain or are coated with combustible liquids (e.g. organic
solvents) of danger class A 1 (accessories recommended !), A II, A HI and B (FRG: in accord-
ance with VbF). The flash point of the respective combustible liquid may be < 21 °C (Cl. A I), be-
tween 21 °C and 55 °C (Cl. A II), between 55 °C and 100 °C (Cl. A III), or it can be mixed with
water at room temperature (< Cl. B).
The oven has been designed for continuous use.
Protective gloves, goggles etc. must be made available to the operator.
The oven may not be used:
- with a Thermo Vacucenter ®.
- with non explosion-proofen pumps.
- with non conductive hoses.
- for the heat treatment of combustible dust or fibrous materials.
- to heat food.
Please consult Thermo Electron LED GmbH, if you have any queries regarding proper operation.

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3. UNIT SPECIFICATION
OPERATING PRINCIPLE
The oven has been designed for general heating and vacuum applications. Equipped with special
safety devices, the oven is also suitable for the heat treatment of articles or materials that contain
or are coated with combustible solvents which release vapors that burn or produce a dangerous,
potentially explosive mixture when they come into contact with air.
Apart from the usual regulations and standards for explosion protection, other fundamental princi-
ples / knowledge must be referred to in order to assess the explosion hazard and derive the re-
sulting structural measures to be implemented.
At the beginning of the 1930s, various series of experiments and findings were published on the
subject of "combustion limits of combustible vapor/air mixtures in a vacuum". These experiments
showed that a solvent vapor/air mixture only becomes explosive when a certain minimum pres-
sure prevails in the mixture.
For example, a mixture of ether vapor and air is only explosive when the pressure exceeds
approx. 200 mbar and a mixture of alcohol vapor and air requires a pressure in excess of approx.
400 mbar before it becomes explosive.
lt is generally accepted that an explosive mixture of solvent vapor and air can be ruled out with an
adequate degree of certainty at a pressure of approx. 0.1 bar. If minimum pressure is under-
shot, this is a more or less a primary explosion protection measure.
An explosion with dangerous consequences can only occur when the following conditions are
fulfilled simultaneously:
1. The concentration of the combustible substance in the air is within the explosion limits.
2. There is a dangerous quantity of explosive atmosphere.
3. The combustible substance demonstrates a high degree of dispersion (vapor, mist) in air.
4. There is an effective ignition source.
An explosion with dangerous consequences cannot occur even if only one of these
conditions is not fulfilled.
The following protective mechanisms offer a solution to this problem without detrimentally, affect-
ing the working parameters any more than necessary (lowering the operating temperature, reduc-
ing the heating power, limiting the surface temperature, ...):
Implement suitable structural measures to ensure that the pressure in the chamber falls below the
minimum ignition pressure quickly once the process has started, before activating the "hot surface
- heating" potential ignition source.
The possibility of an increase in pressure in the event of a fault must be taken into consideration
(e.g. power failure, leakage, ...) during the process and the protective system raust be provided to
handle this situation.
The hot surfaces which are present when the oven is in service must be enabled by a monitored
system to ensure that explosion protection is still provided in the event of a fault in this facility.

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3. UNIT SPECIFICATION
OPERATING PRINCIPLE
As far as the realization of the process and safety aspects of this approach (refer to Fig. 1/3) are
concerned, this means that:
the unit's heating system (item 8) must be interlocked as a function of the internal pressure
"minimum ignition pressure protection device"
combined with
emergency inertization (Items 4, 5, 6) in case the pressure increases during the process
combined with
inert-gas mode (Item 1, 2, 3) during the heating process
Additional safety mechanisms may be expedient depending an the combustible liquid.
This appliance contains only chemical-proof diaphragm vacuum pumps. If other pumps are
used, take additional measures to avoid critical temperatures or failures.
Slide vane rotary vacuum pumps, for example, should not be used for these applications. The
solvents would render the pump lubrication ineffective within a very short period and the moving
(hot) parts of the pump constitute another potential ignition source.
"Chemical-resistant" diaphragm vacuum pumps offer a more expedient solution for these
applications. These should be used in conjunction with traps, however, in order to
1. extract the vapors in question by condensation and discharge them for proper disposal.
2. protect the vacuum pump against aggressive media.
If the combustible solvent used already develops a sufficient quantity of combustible vapor at room
temperature (flash point < 21 °C (FRG: Class A I in accordance with VbF)), to produce a danger-
ous, potentially explosive mixture while actually loading the oven, it is advisable to install vacuum-
tight flame traps in the vacuum section between the oven and the flue-gas as a precautionary
measure (accessories).
his ensures that if, for any reason, ignition takes place during the process, it cannot propagate
outside and therefore prevents system detonation.

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16
20
15
19
14
15
1
3. UNIT SPECIFICATION
OPERATING PRINCIPLE
Fig. 3/1: Process diagram
:
22 23
1 Inert -gas connector (process gas) 13 Heating
2 Inert-gas / process-gas supply 14 - Vacuum cut-off valve
3 Fine metering valve 15 -
Flame trap (accessory)
4 Emergency inertization supply 16 Vacuum pump
5
Emergency inertization cut-off valve
17
Material undergoing treatment
6 Emergency inertization valve 18 Extracted vapor
7 Pressure indicator 19 -
Exhaust gases led safely outside
8 Minimum ignition pressure switch 20 - Mains connection
9
Relief valve
21
Emergency inert-gas connector
10 El. control section 22 Condensation trap (accessory)
11 Oven door 23 Condensation trap (accessory) or
12 Inner chamber
emission condenser

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3. UNIT SPECIFICATION
CONSTRUCTION
The oven essentially comprises a casing, an oven chamber with swing-out door and a switching
and control unit.
The vacuum-tight inner container constitutes the oven chamber. The heater is attached to the in-
ner chamber at the outer side circumferential.
The vacuum drying oven has been designed for operating temperatures up to 200 °C and a final
vacuum (according to the pump) of up to 0.01 mbar.
The thermal insulant provides good heat insulation and temperature - time parameters, ensuring
that heat emissions are within economic limits.
The inner chamber is sealed off by the door, which has a viewing window with integrated implosion
protection.
The operator control elements of the electrical and vacuum equipment have been combined in the
control panel on the control unit. The switchgear compartment is ventilated through the rear panel
of the oven, effectively preventing the ingress of the solvent vapors released during loading / un-
loading into the electrical system.
The oven is a plug-in unit and is equipped with a non-detachable power cable. Electric-shock
protection is provided by the PE terminal (protection class 1) on the mains side and by safety
extra-low voltage circuits (SELV-E) on the control side.
The laboratory drier is equipped with an interference suppression facility.
The temperature is regulated by an electronic temperature controller with a sensor breakage de-
tection facility, the temperature is recorded with a platinum temperature sensor (Pt 100). The
heat output is adjusted by the controller via power semiconductor devices.
An inert-gas connector has been provided for the "process gas" required for the heat treatment of
materials that contain or are coated with combustible solvents.
An inert-gas connector has also been provided for emergency inertization to enable the safe
handling of faults resulting from leaks.
SAFETY DEVICES
The oven has been equipped with the following safety devices:
shock current protection
protection of the surrounding area against potential fire hazards resulting from overheating
thermal protection of the loaded articles or materials under normal and exceptional conditions
protection against the effects of an implosion
protection against excess pressure when using inert gas
protection against potential explosion hazards when using combustible solvents
protection against potential explosion hazards in the event of a failure in the vacuum interlock
protection against potential explosion hazards caused by the ingress of solvent vapors into the
electrical system.

It is electrically and functionally independent of the temperature control system.
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3. UNIT SPECIFICATION
SAFETY DEVICES
RELIEF VALVE
The oven is equipped with a relief to ensure that the pressure does not increase above atmos-
pheric pressure while the unit is in operation using inert gas. This valve prevents an unaccepta-
bly high pressure from building up in the system In the event of a fault, e.g. if the door seal sticks
to the viewing window (operate pressure: < 0.1 bar).
The valve is fitted onto the small flange (DN 25) on the rear panel of the unit.
Check that the relief valve works properly within the prescribed inspection intervals, at
least once a year.
MINIMUM IGNITION PRESSURE PROTECTION DEVICE
The oven is equipped with a minimum ignition pressure protection device in order to reduce the
potential explosion hazards associated with substances containing combustible solvents to a
minimum. This device prevents any potential ignition sources inside the unit (hot surfaces) from
becoming effective and igniting a potentially explosive mixture of solvent vapor and air.
This device ensures that the heating system is only enabled when the pressure inside the oven
has dropped below < 0.1 bar. lt permits safe operation in spite of the presence of a residual oxy-
gen component and vapors from the combustible solvent, even if the surface temperatures are
within the ignition range.
Check that the minimum ignition pressure protection device works properly within the
prescribed inspection intervals, at least once a year.
EMERGENCY INERTIZATION FACILITY
The oven is equipped with an emergency inertization facility in order to keep the situation under
control if a fault (e.g. pressure rise due to the admission of air) occurs while the unit is working with
combustible solvents.
The emergency inertization facility must be switched on separately ("sensitized") before using the
oven to work with combustible solvents. A separate supply of inert gas must be available in order
to keep the situation under control in the event of a fault.
Before starting the process, always check that there is an adequate supply of inert gas
under the correct input pressure.
Check that the emergency inertization facility works properly within the prescribed in-
spection intervals, or at least once a year.
Check that all seals and hose connections work properly and inspect for signs of damage
every six months, or at least once a year.

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3. UNIT SPECIFICATION
SAFETY DEVICES
SWITCHROOM VENTILATION
The switch room is equipped with an independent ventilation system in order to prevent the in-
gress of combustible vapors into the electrical control section (switch room).
The air current is directed in such a way as to keep any vapors that may be present away from
the:control unit (from inside to outside).
Check that the switch room ventilation system works properly within the prescribed
inspection intervals, or at least once a year.

3. UNIT SPECIFICATION
Accessories 1)
The following accessories are available for the laboratory vacuum oven:
Vacuum-tight, detonation-proof flame traps to protect the vacuum section between the oven
and the exhaust-gas outlet.
These are particularly useful when the oven may be working with combustible solvents which
have a flash point < room temperature (21 °C). Such solvents already develop so much sol-
vent vapor in the closed container (just after being loaded) that the possibility of a potentially
explosive atmosphere building up in the inner chamber cannot be ruled out completely.
The above-mentioned conditions also apply to the same extent for combustible solvents which
have a flash point which is higher than the ambient temperature (> 21 °C), which are loaded in-
to the oven while it is still warm.
For the event that ignition of such a mixture occurs at the beginning of a process, e.g. caused
by a defective vacuum pump, it is advisable to use flame traps to prevent propagation to the
outside.
The use of independent condensation traps is to be particularly recommended at the intake
side of the vacuum pump as an efficient means of recovering the solvent, which is released in
the inner chamber during the heat treatment process and protect the vacuum pump against
aggressive media. Maximum efficiency in solvent recovery can be achieved with this equip-
ment.
Diaphragm vacuum pump HMD 4 C, suction power approx. 2.6 m3/h
Emission condenser for solvent recovery for vacuum pump HMD 4 C
Support frame
Viton door seal
1) Refer to the section an "APPROVED SPARE PARTS AND ACCESSORIES" for ordering information, refer to
the relevant sales literature for a description and the technical data.
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3. UNIT SPECIFICATION
CONTROL PANEL
The switching elements, actuators and control elements are fitted into the control panel.
Fig. 3/2: Control panel
VT 6060 M-BL VT 6130 M-BL
The item numbers quoted in the following descriptions refer to the item numbers in Fig. 3/2:
Control panel
9: Power switch
To switch the unit on and off - with a green signal lamp to indicate that the unit is ready for
operation.