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Page. 9
Operation
This unit and all L-K Industries sample tubes are designed and fabricated in compliance with API and
ASTM standards. For optimal results, L-K Industries sample tubes (along with matching shields,
cushions and collars) should be used. Verified and certified tubes are also available.
Be
fore centrifugation, all tubes, collars, cushions and shields should be visually inspected for damage.
Check for oil residue on cushions and ensure that the cushions rest flat inside the bottom of each
shield. Damaged parts must not be centrifuged, as they may break and cause further damage to the
centrifuge.
Figure 4:
Front Panel Switches
Loading and Powering On
To
supply power to the unit, turn the “MAIN DISCONNECT” switch to the right. The “MAIN POWER” green
indicator light should signify that power is on. Verify that the red “EMERGENCY MOTOR OFF SWITCH” is
not engaged.
Open the sliding door and place the filled sample tubes into the shields with collars resting at the top of
the shields. Ensure that the tip of each tube rests firmly in the cushion. Before every test, inspect the
inner bowl for foreign objects and close the door. The green “STO ACTIVE” indicator light turns on when
the door is properly closed (Safe Torque Off/STO is a safety function that cuts off the supply voltage
when the door is open). Press the black “MOTOR POWER ON” button to give voltage to the motor. The
“MOTOR POWER” indicator should be lit.
Heated Operation
Preheat the unit by turning the “TEMPERATURE CONTROLLER” switch to the “ON” position. The unit is
factory programmed to 140°F/60°C. In colder environmental conditions, it may be necessary to set the
operating temperature approximately 15-20 degrees above the desired sample temperature (maximum
recommended set point is 160°F/71°C). Keep the sliding door closed as often as possible to minimize
heat loss. Once the temperature set point has been reached, the LCD display will switch from red to
green. Dry block or water bath heaters may be purchased separately from L-K Industries to preheat
samples.
The
temperature probe is located underneath the lid, above the centrifuge bowl. The unit is equipped
with dual high intensity heating elements. The temperature display indicates the temperature inside the
bowl, NOT the samples. To determine sample temperature, a thermometer must be placed inside each
sample tube once a test is complete. Thermometers may be purchased separately.