Labconco 3500100, Руководство пользователя

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Chapter 3: Normal Operation & Routine Maintenance
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(6) Place solvent of proper type and quantity into beaker. A quantity of
25 to 35 ml of solvent is normally sufficient for an estimate 3 to 4
hours of refluxing.
(7)
Assemble beaker to retainer ring with the wave washer inserted and
twist to lock securely in place. After beaker is locked in place, pull
down elevation control knob and twist ¼ turn to the left. Raise
control knob to “catch” position and again twist ¼ turn to the left.
Slowly allow heater to rise against bottom of flask. DO NOT let go
of knob until heater is in position against beaker.
(8)
Select heat rate required using panel control switch(es). Control is
provided for full range of power with the “HIGH” position providing
both heaters with approximately 100 watts each. Control position “5”
provides approximately 35 watts each.
(9)
Turn the main power switch, located on the right side, to the ON
position. Switches on the panel each control two heaters.
NOTE: If only one extraction is being made, the adjacent (or
companion) heater, operating on the same panel switch, should be
loaded with a beaker of solvent or water to “load” the heater and
increase its service life.
(10)
Pre-heating the heaters for about 8 to 10 minutes prior to starting
samples will reduce waiting time for start of refluxing.
(11)
Water flow rate through the condenser head system can be regulated
to provide a wide range of reflux rates, when used alone or in
combination with heater control selections.
NOTE: If water flow rate is reduced too much, solvent will be lost in
the beakers. A condenser without flow rate will permit solvent to
escape through the pressure relief valves.
(12)
When extraction is completed, place heater covers on heaters to
prevent solvent from coming into contact with the hot heater.
Remove sample tubes, replace with reclaiming tubes and remove
heater covers. Heat transfers solvent into the reclaiming tube, leaving
oil in the beaker.
(13)
Drying of the extract is accomplished efficiently with a special swing
beaker holder (one holder behind each heater assembly) which
inclines the beaker at a slight angle in the warm air above the heater
assembly. When all but the last few milliliters of solvent is
evaporated, the beaker is placed in a drying oven, weighted and
compared to the tare weight of the beaker. Weight difference is the
amount of extracted material.