Capacitive sensing system and technique

摘要: An arrangement senses a liquid level by monitoring the peak capacitance formed between probe and as approaches or departs from liquid. In an automated system, computer controls position of pipette for aspirating dispensing in vessel. The charge developed via on is coupled to capacitive sensor circuit which provides detector with amplified signal representing This detected peak-capacitance discrimination circuit, output monitored determining precise respect surface level. Other aspects present invention include negative-static elimination latch positive-static input latch.