Stirring Operating Instructions - VWR ADVANCED Serie Manual De Instrucciones

S
O I
TIRRING PERATING NSTRUCTIONS
The micro-processor controlled ramping feature slowly increases speed until
the set-point is reached. This feature helps to avoid splashing, improves
magnetic coupling and provides excellent low end control. The micro-proces-
sor also monitors and regulates the stirring speed, sensing your requirements
whether you're stirring an aqueous, viscous or semi-solid solution.
Initial stirring speed may exceed set speed if the following conditions exist:
1. The stirrer is set at a low speed and the stirrer has not been operated for
a extended period of time.
2. The stirrer is set at a low speed and it is the stirrer's initial use.
1. Getting ready:
a. Turn stir knob to the off position. Plug power cord into a properly
grounded outlet.
b. Place a vessel with solution and the appropriate spin bar in the
center of the top plate.
2. Setting speed:
a. Turn the stir knob clockwise until the pointer reaches the desired speed
setting. The stir indicator light above the stir knob will illuminate to
indicate the stirring feature is in use. The stir indicator light will blink
while reaching the set-point. Once the set-point is reached the light
will remain lit.
b. Speed adjustments can be made without interrupting stirring by
turning the stir knob clockwise to increase speed, or counter-clockwise
to decrease speed.
c. To stop stirring, turn the stir knob to the off position. Your vessel
can then be removed.
Stir protection for Hotplate-Stirrers:
If stirrer motor stops or fails, the unit will automatically shut down
the heater.
O T
PERATING IPS
The stirrer increases speed at a steady rate until the set-point is reached, if
the stir bar is too large or the liquid is too viscous, the stirrer may not reach
its set-point. The set-point speed needs to be reduced. The magnetic
strength of stir bars reduce over time and may need to be replaced.
Stirring vessels in oil baths:
When heating and stirring a reaction vessel within an oil bath or similar
set-up, the stirring function will stir up to approximately 2,54cm
from the top plate. The stirring speed will vary according to liquid
viscosity, stir bar length and distance from the top plate. Adjust one
or all of these to achieve the desired stirring speed.
EXAMPLE: The closer the reaction vessel is to the top plate the stronger
the magnetic connection.
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