Setting Up - IKA Vacstar digital Betriebsanleitung

A distinction is made between different ranges in vacuum tech-
nology.
Rough vacuum: 10 5 to 10² Pa
Fine vacuum: 10² to 10
High vacuum: 10 -1 to 10
Ultra high vacuum < 10 -5 Pa
The periodic movements of the diaphragms create a vacuum at
the pump inlet. Diaphragm vacuum pumps work with a rough
vacuum of up to 10 2 Pa. Lower pressures cannot be achieved with
these pumps.
To create fine, high and ultra high vacuums, oil-sealed vacuum
pumps, screw pumps, diffusion pumps or turbomolecular pumps
must be used, for example. Diaphragm vacuum pumps are often
used as pumps for the preliminary stage in these contexts.
Two-position control
When the target value is reached, the suction line is interrupted.
Due to the small delay between the times when the pressure
value is detected, when comparison is made with the target value,
when a vacuum valve is switched off and when the suction line
of the vacuum-producing system are switched off, it is easy to go
below the set target value. If the pressure in the system goes up
again due to a natural leakage rate, the suction line valve opens.
Schematic view of two-position vacuum control
mbar
Ensure that you follow the general
NOTE
rule, that the recipient (load/vacuum
container/glass condenser) should
always be connected to the suction
line at its highest point. This reduces
the risk of liquids entering the
vacuum pump.
Liquid in the pump chambers
makes the pump properties worse.
Connect the hose connections
(INLET/OUTLET) and interfaces in
accordance with the labelling on
the pump
instructions.
(1000 to 1 mbar)
Pa (1 to 10 mbar)
-1 -3
-5 Pa (10 -3 to 10 -7 mbar)
(< 10 -7 mbar)
t
and the operating
Compressing and releasing the pressure on air creates a noise. The
pump is quieter the less air is transported. This means that there
is less operating noise during normal operation if the pressure is
reduced.
A fitted exhaust hose with a sound absorber can also be used to
reduce noise.
In automatic operation with controlled speed the pump reduces
its speed when it reaches the target value. If the leakage rate in the
entire system is low enough, the speed may even be set to "zero".
When combined with the vacuum controller VC 10 or the rotary
evaporator with integrated vacuum controller RV 10 auto, the
pump can also be used for "two-position control" (valve-con-
trolled) or "analogue speed control" of the vacuum.
Analogue speed control
With this control, the speed of the pump, and therefore its suction
power, is reduced the closer the measured pressure reaches the
target value. Once the target value is reached, the pump only
operates according to the leakage rate of the system. This enables
quiet functioning, precise vacuum control and a long service life
for the moving pump parts. Exact automatic boiling point recognition is
possible with this type of control, meaning that the system reaches
and keeps the solvent at its boiling point in automatic mode.
Schematic view of speed vacuum control
mbar

Setting up

The connections are barbed hose connectors. Ensure that the hoses
have hose clips if applicable.
Lay the hoses in such a way that no condensate can flow into the
pump.
Ensure that the air can enter the ventilation slit (H) unhindered.
Install a condensate separator (e.g. a Woulff bottle) in the suction
line before the intake spigot of the pump to protect against water
coming in.
If solvent vapours are sucked in, an emission condenser (accessory)
after the pump helps to condense it, and prevents it being released
into the atmosphere.
t
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