OHAUS VXMTAL Manuel D'instructions page 9

o i - d
Perating nStructionS igital
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. By sure the rocker switch is in the off position, depressed to the right.
b. Plug the power cord into a properly grounded outlet.
c. Press the rocker switch to the on position, depressed to the left. The speed and
time displays will illuminate.
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.
3. Setting speed:
Press the up/down arrows to the right of the speed display until you reach the
desired speed.
4. Setting timed mode:
To run in timed mode, press the up/down arrows to the right of the time display
until you reach the desired time. Press the run button. The unit will run for the
programmed time. Time LED will display time remaining.
m -t v
ulti ube ortexer
5. Setting continuous mode:
To run in continuous mode, set the time to zero (0) using the up/down arrows to the
right of the time display. Press the run button and the unit will run until you press
the stop button. Time LED will display accumulated time.
6. Setting pulse mode:
a. Make sure the unit is not running.
b. Press the on button above the word pulse. The unit must be stopped before
pressing the pulse-on button.
c. To stop the pulse feature press the off button above the word pulse. Pulse mode
is factory programmed for 2 seconds on, 1 second off. The pulse-on and pulse-
off times can be adjusted between 1 and 59 seconds in 1 second intervals.
7. Reprogram the pulse-on and/or pulse-off time as follows:
Pulse-on time
a. Press rocker switch to the off position, to the right.
b. Press rocker switch to the on position, to the left, while holding pulse-on button.
The LED display for speed displays current pulse-on time. The pulse-on button
can be released if necessary once the display is illuminated.
c. Change the pulse-on time using the up/down arrows to the right of the speed
display.
d. When the rocker is pressed off, the value on the speed display is stored as the
new pulse-on time.
Pulse-off time
a. Press rocker switch to the off position, to the right.
b. Press rocker switch to the on position, to the left, while holding pulse-off button.
The LED display for time displays current pulse-off time. The pulse-off button can
be released if necessary once the display is illuminated.
c. Change the pulse-off time using the up/down arrows to the right of the time
display.
d. When the rocker is pressed off, the value on the time display is stored as the
new pulse-off time.
EN
8