FIELD: printing industry.
SUBSTANCE: ink level sensor comprises: a measuring capacitor which capacity varies with the change in the ink level in the chamber; a switch T2 for application to the measuring capacitor of voltage Vp, which charges the measuring capacitor; a switch T3 for the charge distribution between the measuring capacitor and the reference capacitor, resulting in a reference voltage Vg; and an evaluation transistor which configuration ensures the presence of resistance "source-drain" proportional to the reference voltage.
EFFECT: increase in accuracy.
17 cl, 10 dwg
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