OHAUS VXMTAL Manuel D'instructions page 6

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Perating nStructionS nalog
The Multi-Tube Vortexer is used to prepare samples by mixing tubes just prior to testing.
IMPORTANT: This unit is designed for intermittent use only. DO NOT operate this unit for
more than two hours at any one time.
1. Getting ready:
a. The speed and time knobs have a built-in on/off switch at the extreme counter-
clockwise position. Turn the speed and time knobs to the off position.
b. Press the rocker switch to the standby position, in the center.
c. Plug the power cord into a properly grounded outlet.
2. Loading bottom tray:
a. Loosen both screw knobs on the support plate. Lift the plate up. The screw knobs
may be tightened to hold it in place, or if desired it may be swung out of the way.
To do this, lift until the plate comes off the short right post and the left knob is up
into the circular groove around the top of the left post. Screw the left screw knob
in the circular groove but not quite tight. In this condition the support plate may
be swung around the left post and out of the way.
b. Fill the tubes to be vortexed and place them in the correct size test tube foam
rack. Best results will be obtained if all tubes are filled to the same level, and not
exceeding half of the tube capacity. Distribute tubes uniformly throughout the
test tube foam rack. Always be sure that a tube is in each of the four corner holes
on the test tube foam rack to properly hold the support plate. Empty tubes may be
used for this purpose.
c. Lower the support plate onto both posts and down on top of the tubes. Let the
support plates weight rest on the tubes but DO NOT press down. Tighten both
screw knobs securely.
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ulti ube ortexer
3. Setting speed:
a. Turn the speed knob clockwise to the 1 position.
b. Press the rocker switch up to the continuous run position. The Multi-Tube Vortexer
will start.
c. Increase the speed by turning the speed knob clockwise until the desired speed
is reached. Always use the slowest suitable speed.
d. To stop vortexing, press the rocker switch to the standby position, in the center.
4. Setting time:
a. For automatic timed operation, adjust the speed as in step 3, then set the time
knob to the desired time, clockwise to increase and counter-clockwise to decrease
time.
b. Press the rocker switch briefly to the timer position, downward, and release. The
Multi-Tube Vortexer will run for the selected time and shut off automatically.
c. To repeat for the same time, simply press the timer switch again. To interrupt
an automatic timing cycle before it is complete, turn the time knob to off, extreme
counter-clockwise position.
When operating the Multi-Tube Vortexer, use the rocker switch to start and stop
operations, leaving the speed knob on. When the unit is not being used turn the speed
knob to off, extreme counter-clockwise position.
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