When the capacitive liquid level sensing system ascertains a desired aspiration position of the probe tip 150 relative to the serum level 152 in the sample tube 15, the sensing system provides {HEAD ~ a sensor signal} to initiate {TAIL ~ aspiration} of a sample of the serum 20 from the sample tube 15 into the probe 12 
to initiate
When the capacitive liquid level sensing system ascertains a desired aspiration position of the probe tip 150 relative to the serum level 152 in the sample tube 15 , the sensing system provides { HEAD ~ a sensor signal } to initiate { TAIL ~ aspiration } of a sample of the serum 20 from the sample tube 15 into the probe 12
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