THRESHOLD LEVEL GAUGE Russian patent published in 2000 - IPC

FIELD: geodetic instrument engineering for measurement of two threshold values of liquid level in hydrostatic level vessels, in automated production process control systems associated with monitoring of the position of liquid level relative to threshold values, in signalling systems at oil storages. SUBSTANCE: the threshold level gauge has a casing accommodating a point light source, TV camera, whose output is connected to a recorder comprising a television signal shaper, television line counter, decoder, two "2AND" gates and a flip-flop. The TV camera is installed for control of its operating position by turning about its optical axis and inclination. The shaper video pulse output is connected to one input of the "2AND" gates, and the line and frame pulse outputs - to the complementing and reset inputs of the television line counter respectively, whose outputs are connected to the decoder inputs. One decoder output is connected to the input of one "2AND" gate, and the other - to the input of the other "2AND" gate. The outputs of the "2AND" gates are connected to the set inputs of the flip-flop. EFFECT: simplified manufacture and operation. 1 dwg