Vacuum oven with Peltier cooling
VO COOL 200
VO COOL 400
Pump Module
PM 200
PM 400
OPERATING INSTRUCTIONS
VO Cool
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PRINT
SETUP
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MAX
MIN
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AUTO
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page 3
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VO Cool
This mark in the Operating Instructions means:
Watch out
You have purchased a technically fully proven product which has been produced in Germany with the use
This mark on the product means:
Warning – oven hot when operating!
Warning – oven hot when operating!
The right to technical modifications is reserved.
The door and the security glass panels must be checked regularly for scratches or damage. No vacuum
Always use gloves!
VO Cool
page 5
min. 15
cm
min. 8
cm
min. 8
cm
min. 20
cm
The oven can be placed on the floor or on a
(see Section:
„Maintenance“)
The spacing from the back of the oven to the
VO Cool
When the oven is started up for the first time, it should be supervised continuously until steady conditions
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Width G [mm]
Weight [kg]
Vacuum oven
Ambient conditions
Ambient temperature 5°C to 40°C
Working temperature range
mbar 1/sec
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Alphanumeric text display
Vacuum pressure control for digital operation of the built-in solenoid valves
Visual alarm indication
Temperature-dependent control unit ventilation
A pre-formatted blank MEMoryCard XL with 32 kByte storage capacity, reprogrammable for up to 40
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WARNING! Always pull out the supply plug before
WARNING! Always pull out the supply plug before
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.
Any work involving opening up the oven must only be carried out by a suitably qualified
Any work involving opening up the oven must only be carried out by a suitably qualified
Working space: stainless steel (Mat.Ref. 1.4404) featuring high stability, optimal hygienic properties,
and corrosion resistance against many (not all!) chemical compounds (warning against chlorine
compounds, for example).
The load for the vacuum drying oven must be carefully evaluated for its chemical compatibility with the
A table listing about the compatibility of all these materials can be requested from MEMMERT.
VO Cool
VO Cool
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Vacuum pump (optional)
VO Cool
a suitable external vacuum pump, using the Neoprene connection tubing (8) supplied with the
pump module.
together using the cable (12) supplied with the equipment.
to the gas inlet IN2 (4). The maximum pressure of 1.5 bar must not be exceeded! (Use pressure
reducing valve for 1.5 bar max.)
Turn on the CDP Peltier cooling unit (3)
Warning
Warning
VO Cool
2
1
3
page 13
7 Switching output for external vacuum pump
purge valve and pump control (option)
The 3-way switched output serves to control the vacuum
pump of the optional pump module (PM) of the vacuum oven
(VO).
7.1 Vacuum pump purge valve
When loads with a high moisture content are being dried
there is a possibility during prolonged operation that the
pump output decreases through condensate forming in the
pump heads. The diaphragms can be blown free by briefly
purging the pump heads with fresh air. This improves the
effectiveness of the drying process.
Note:
In conjunction with the optionally available pump modules
PM 200, PM 400 and PM 500 this cyclic purge takes place
automatically as the pump performance deteriorates.
Decisive advantage:
The drying process takes place more rapidly and with reduced
energy consumption, the wear on the pump is reduced.
This function can be de-activated by removing the pump purge connecting cable at the back of the unit.
7.2 Demand-controlled vacuum pump shut-down (option)
After the end of a drying programme, or after prolonged operation with any vacuum demanded by the
controller, the vacuum pump incorporated in the pump module (PM) is switched off via the control line.
Note:
A control signal switches off the vacuum pump incorporated in the optional pump module (PM). The
signal lamp in the main switch of the pump module remains alight even when the vacuum pump has been
switched off via the control line.
Decisive advantage:
The demand-controlled shut down of the vacuum pump reduces energy consumption and increases the
life of the vacuum pump by reducing the wear on the pump diaphragms.
This function can be de-activated by removing the pump purge connecting cable at the back of the unit.
The vacuum pump is then running continuously.
Pin connections of the socket
on the back of the unit:
1 output purge valve
GND (switched)
2 24V DC
3 pump switch-off
GND (switched)
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The load must only be placed on the thermoshelves.
combination with air.
on the tray.
When the oven is being operated with inert gas (nitrogen, helium, neon, argon, krypton) there is a small
The list of MAK values (maximum workplace concentration) and of BAT values (biological workplace
The appropriate specifications of the trade association publication „Guidelines for the Laboratory“ (ZH1/119)
Avoid any open fire in the area near the gas cylinders. Inert gas is not combustible, but it is
possible for the cylinder to burst.
flow into the cylinder.
When not in use, close the shut-off valve.
The instructions and safety information of the gas supplier have to be observed.
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(with venting cycles).
cycles should be chosen to suit the moisture content of the load.
during evaporation may result in the set temperature not being reached.
The oven described in these Operating Instructions
The oven described in these Operating Instructions
The ovens described here must never be operated
The ovens described here must never be operated
VO Cool
set
off
on
push
card
PRINT
SETUP
loop
t3
t4
t2
t1
on
off
Mo
Tu
We
Th
Fr
Sa Su
STERI DEFRO
°C
°C
rh
%
2
IN 1
IN 2
OUT
IN 1
IN 2
OUT
MIN
AUTO
MAX
mb
The oven is switched on by pressing the push/turn control.
After the SET key has been released the display briefly flashes the temperature setpoint. The display then
open
close
The door is opened by pulling on the door handle.
The door is closed by the door handle being pushed in.
(main switch)
open
close
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page 17
The quick venting function is used in unloading and loading the vacuum oven without having to alter the
in the menu.
again.
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