Inserting the Stack Assembly
Slide the stack assembly into the test chamber with the column arms
locked. The stack assembly is stopped at the top by two tabs on the
driver support plate. On the test chamber table, you will notice two
rivets that will limit how far the stack can be placed inside the
chamber. Also on the floor of the test chamber is the table switch, a
safety interlock device that prevents the unit from operating if the
stack moves forward out of position. This switch will be properly
deployed and the circuit activated if the stack is inserted correctly.
Once the stack assembly is in position, the column lock can be
released by sliding a thumb and forefinger into the openings between
the lowest sieve or spacer and the column locking arms. Spread the
column locking arms. The spring-loaded column lock will release and
expand to lock the column into the test chamber, forming an airtight
seal. Close the sliding door to the test chamber.
Beginning the Test
Rotate the SIFT/PULSE switch to the PULSE setting. While virtually all
test procedures benefit from the use of the PULSE circuitry, some may
not. Use the setting appropriate to your samples.
Setting the Amplitude
Note: The amplitude is the “lift” particles see as the oscillating air
column is set in motion. The higher the amplitude setting, the more
lift on particles. Moving the particles more vigorously than necessary
DOES NOT increase the speed or precision of the separation. In fact,
excessive amplitude settings may increase electrostatic problems,
sample loss, and equipment wear.
WARNING: Due to the extremely fragile nature of the Precision
Electroformed Series sieves, excessive amplitude, especially over
extended periods of time can cause immediate or premature sieve
failure.
After starting the timer, increase the amplitude SLOWLY until the
largest of the particles begins rolling on the top sieve. The entire
operation can be viewed through the sidewalls of the sieves. The finer
material should begin flowing through the sieves within seconds. Each
particle is being lifted off of the screening surface and set back down
on the sieve openings 60 times per second when using 60 Hz current
(50 times per second when using 50 Hz current).
Summary of Contents for L3P Series
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