INDICATOR OF LOOSE MATERIAL LEVEL Russian patent published in 1995 - IPC

FIELD: measuring equipment. SUBSTANCE: indicator has moment thyratron DC electric motor 1 having built-in commutator 2 based on reed relay 7 and inductor 10 with permanent magnets 11. Both outputs of each reed relay are connected with inputs of alarm of rotation 3. The alarm consists of differentiating circuit 12 whose inputs are outputs of the alarm, diode circuit 13, integrator 14, hysteresis threshold unit 15, electronic switch 16, and output relay 17. The positive pressure chamber is made inside the housing of the electric motor in the zone of working end of the output shaft. The chamber is in communication with a source of compressed air. The outlet opening of the chamber points to the impeller and freely encloses shaft of the electric motor. EFFECT: improved design. 4 cl, 4 dwg