LEVEL POSITION PICKUP Russian patent published in 1999 - IPC

FIELD: check of level of liquid in technological vessels. SUBSTANCE: sensitive element of level position pickup is connected to converter by means of rod and is made up of excitation and test piezoelements placed into streamlined case of insulating material that transmits acoustic vibrations and is resistant to corrosive liquids and coat having low adhesion properties. Excitation and test piezoelements are mechanically tied to case with the use of elements conducting acoustic vibrations and are electrically interconnected through amplifier and band-pass filter to form circuit exciting ultrasonic vibrations. Determination of level position of liquid is based on difference of capabilities of liquids and gases to absorb energy of ultrasonic vibrations. EFFECT: improved operational characteristics. 1 cl, 2 dwg