Hoefer FH225V - Manual (Page 14)

7
Close all valves. (See the illustration on page 2 for
positions.)
Please note that the valve is a threaded stopcock. To be
in position to open and close the drain channel prop-
erly with only a 90° turn, it must not be screwed in too
far clockwise nor unscrewed too far counter-clockwise
from the original position, as shown on page 2.
8
Turn on the vacuum. The gauge will register the
amount of vacuum.
9
Pour sample(s) into the chimney weight well(s).
Open valves to wells where filtration is desired.
Wash filters, if required.
After filtration
1
Turn off the vacuum.
2
Remove each weight then lift the filter with narrow
forceps. A recess next to each filter holder accommo-
dates forceps for easy filter removal.
3
Drain the collection box if necessary. (See the Care
and maintenance section.)
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p6
Note: When the indenta-
tion faces up (and the valve
handle is in a horizontal
position), the valve is closed.
To open the valve, turn the
handle 90° (the valve handle
will be in a vertical position).