Product introduction:1. Widely used in cement, building materials, metallurgy, mining, electricity, chemical industry etc of ball grinder measuring grind sound.
2. The product is light and installation is convenient.
3. High ability in resisting electrical current and voltage surge.
4. With wide frequency range and good response.
5. Active filter, with frequency selection characteristic.
6. Grind sound signals is steady and smooth.
7. With good directivity and small interference.
8. The calibration signal, interior can calibrate.
9. Grind sound sensor is full-sealing. It well suits to the bad conditions with high humidity and high dust. 
10. Connect with computer to forming a grind control system to increase production, prevent full grinding and empty grinding, reduce labor intensity and improve labor productivity.
11. Full digital calibration and function setting. There is no need to adjust by potentiometer.
12. Power-off protection function: when debugging, the parameters that write to the memory will still be saved.

Technical parameters:1. Measurement range: 0%～100%
2. Probe impedance: 600Ω±15%
3. Frequency response: 50HZ～18000HZ
4. Sensibility: 73dB±2dB
5. Input sound intensity signal: 4MA～20MA
6. Measurement error: ±0.1%
7. Constant current accuracy: when load changes, the output current changes better than 0.5%
8. Working temperature:－5℃～＋70℃
9. Environment humidity: ＜85%
10. Supply voltage:input：50Hz,220V±10％ 
11. Box size: 73*150*160mm（H*W*D）

12.Loading capacity: <2K

Operating principle:

1. see figure