Monday, 12 April 2021

Electronic ear ORELSO

This equipment is used for regulating and optimizing the infeed of ball grinding mill machines.
The sound emitted from the machine is transformed by the microphone set up in an acoustic box into an analog signal after amplification. The signal representing the nominal working of the equipment called "readjustment signal" is subtracted from the continuous signal resulting from operations.
Only variations around this electrical value are amplified and used for any system for automation, which gives accurate information.

Technical Data :

  • Microphone :
- Microphone sets up into a roll shaped case (Ø 200, 220 mm long) closed on the front side with a chrome screwed grid allowing easy replacement of the microphone.
- Connection at the back with a locking connector by 2 wire shielded cable.
- Microphone support made up of a very stable base (weight = 36 kg), and microphone support which can be easily adjustable for installation.
  • Electronic Circuit :
- Power supply circuit is designed to supply power to the amplification module.

Power supply
230 VAC / 50 Hz – 60 Hz
± 15 Volts
With fuses

- Amplification transforms the acoustic signal into a continuous analog voltage representing sound level. This signal is permanently compared to a reference signal representing the nominal work of the machine. The compensation of permanent noises during the running (other next located machine or grinding mill) is normally done when commissioning.
- Display with a 3 alphanumerical digits module in which shows the representative analog signal of the sound emitted from the machine which is to be monitored.

  • Optional electronic circuit :
- Level circuit is designed to supply 2 thresholds for maxi and mini monitorings and to fix the normal security range. 
Power Supply
230 VAC
Input signal
0-10 volts or 4-20mA

- Compensation circuit is designed to compensate the sounds emitted by other machines (from 1 to 3 units) located near the monitored grinding mill machine.

- Galvanic proof circuit 4-20mA


20-23 April 2021, Bundaberg (Australia) :

ASSCT Industry equipment exhibition 2021, exhibitor and poster presentation.



September 29-30, 2021, Hotel Manaira, João Pessoa, Paraíba (Brazil) :

SEMTEC 7º Seminário Técnico da Indústria do Cimento e Cal