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SECTION 3. OMNI TH OPERATION
3.3 OMNI TH OPERATION
Connect the Omni TH to an appropriate power outlet. Speed of the Omni
TH varies between 5,000 and 35,000 rpm and is set by means of the blue
slider switch. The power switch located above the blue slider switch turns the
motor on and off.
Insert the generator probe into the Omni TH motor (see above). The depth
of the generator probe in the sample vessel can significantly affect flow
patterns within the vessel. This also affects processing efficiency. As a rule of
thumb, the generator probe usually operates most efficiently at a depth of 1/3
(to 1/2) of the liquid height. Heavy sediments may require deeper immersion,
and this processing depth can be optimized by observing flow patterns and
related processing results. While processing, liquid can circulate through the
two holes at the bottom of the generator probe. When using a stainless steel
probe, the top hole should not be immersed in the sample. Blocking the
upper hole could result in liquid being drawn into the lower motor bearing.
Operating at the top speed of 35,000rpm enhances the processing efficiency
of the rotor-stator generator probe. For most samples, three to four short
bursts at top speed should be sufficient for complete homogenization of the
sample.
3.2 OMNI TIP™ PLASTIC PROBES
An Omni Tip™ Adapter (A1000SB) is required to use Omni Tip™ Plastic
Probes with the Omni TH Homogenizer. First, insert the smaller end of the
Omni Tip Adapter into the Omni TH as far as possible, turn clockwise, and
release. Next, insert an Omni Tip™ Plastic Probe into the Omni Tip™
Adapter as far as possible, turn clockwise, and release. The TH is now ready
to operate. Omni Tips™ can be disposed of after use.
WARNING: The Omni TH, Tissue Homogenizer has an internal speed
control. An external speed control should never be used with this
instrument.
WARNING: Reduce the risk of unintentional starting; make sure that the
power switch is in the OFF position prior to plugging in the unit.
