Hoefer SG500 User Manual
Page 5
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p3
4
Carefully open the slide valve and allow just enough
solution to flow through the connector channel to fill
it to the edge of the mixing chamber, then close the
valve. Be sure no large bubbles remain to obstruct
flow through the channel.
5
Add the required volume of the starting solution to
the mixing chamber and start the magnetic stirrer.
6
Open the outlet tubing if clamped off.
7
Simultaneously start the pump.
8
If it is important that no bubbles disturb the
gradient, watch the delivery carefully and as soon
as the last of the solution has entered the pump
head, stop the pump and clamp off the tubing to
the receiving container.
9
Flush and rinse all parts thoroughly with distilled
water after use.
Note: If there is a substan-
tial difference in densities
between the two solutions,
there will be a sudden flow
from the denser chamber
to the lighter chamber to
bring the two into hydrostatic
balance. This will result in
the gradient not being fully
linear. To avoid this, add
equal weights, rather than
volumes, of the solutions to
the appropriate chambers.