Electronic Ear is useful for Control & Regulation of Ball Mills, using the grinding frequency signal for optimizing the Mill Output. It consists of an acoustic signal receiver (Microphone Unit / Sound Sensor) and specially constructed indicating & interpreting electronic circuit (Control Unit).Electronic Ear Ball Mill - Industrial Mechanical,Silo Level and Weighing, Hopper Level and Weighing, Tank Level and weighing. These systems are based on: Weldable sensors, Bolt on sensors, Insert and push type sensors, Load cells, Differential Pressure Transmitters, Radar Level gauges. Electronic Ear Ball Mill Grinding Control system.HASLER Group SOUND 2,The electronic Ears senses the noise of the mill. The Ear consist of a very sensitive microphone installed at the mill inlet, at the grinding ball impact point, and as close as possible to the mill shell. The foam of the Electronic Ear must nearly touch the mill shell between two rows of bolts.