YANG Yi, GUO Yang-kuan, ZHU Lian-qing, et al. A liquid level detection system with capacitance method based on pipette structure[J]. 2015, 34(10): 48-50.
YANG Yi, GUO Yang-kuan, ZHU Lian-qing, et al. A liquid level detection system with capacitance method based on pipette structure[J]. 2015, 34(10): 48-50. DOI: 10.13873/J.1000-9787(2015)10-0048-03.
To achieve high sensitivity and high precision liquid level detection on pipetting process of automatic coagulation analyzer
a capacitive sensor principle combined with stepper motor motion control method is used.Structure and working principle of probe-type capacitive sensor are introduced; detecting principle of C / T conversion method is analyzed; an experiment system is set up to test sensitivity and precision. Results show that the change of pulse period reach to around 40 % at the moment while pipette is contacting liquid surface