Intelligent sound measuring instrument / grinding sound measuring instrument data

The BJW-SHZ7/MYC-5 intelligent grinding sound measuring instrument is a highly effective and direct tool for monitoring the load in a ball mill. Designed with advanced technology, it offers simple setup, excellent stability, full digitalization, and an intuitive panel for setting alarm thresholds. This latest model builds upon the successful BJW-SHZ-6, bringing improved performance and reliability. Its compact design and high durability make it ideal for industrial environments. The device features a membrane keyboard, full sealing, and superior dust resistance, ensuring ease of use and long-term operation. By using this instrument, operators can enhance the efficiency of the grinding process, reduce energy consumption, lower labor intensity, and extend the life of grinding media and liners. It also helps minimize the risk of liner screw breakage. With a quick return on investment—typically within 6 to 12 months—it’s a cost-effective solution for any milling operation. **Working Principle** The BJW-SHZ7/MYC-5 captures sound signals from the mill via a specially designed probe installed in the field. These signals are transmitted through shielded cables to the instrument, where they are converted into digital decibel readings. The device simultaneously outputs a 4–20 mA current signal proportional to the measured sound level. Since sound intensity is inversely related to the filling degree of the mill and directly proportional to the ratio of grinding media to material, it enables accurate quantification of the mill load. Operators can adjust the feed rate accordingly to optimize production output while minimizing power usage. A built-in correction signal source assists maintenance personnel in checking and calibrating the system, and the device includes a dry grinding detection and visual/audio alarm system to alert operators when action is needed. **Technical Specifications** 1. Measurement Range: 80–150 dB or 0–100% (decibel or percentage display) 2. Probe Impedance: Approximately 600Ω 3. Frequency Range: 20–2000 Hz 4. Distance Between Probe and Instrument: ≤100 m 5. Output Signal: Sound Intensity Output – 4–20 mA 6. Display Accuracy: ±0.1 dB 7. Continuous Operation: 24 hours 8. Operating Temperature: -10°C to +55°C 9. Humidity: ≤85% RH 10. Power Supply: 220V (-10% to +10%), 50/60 Hz 11. Dimensions: 160 × 80 × 200 mm or 80 × 160 × 200 mm (opening: 152 × 76 mm or 76 × 152 mm) 12. Weight: Approximately 1 kg **Key Features** 1. Digital display for clear and precise readings 2. Panel-based input for alarm limits 3. Interference-resistant design for adjacent mills 4. High sensitivity with no drift 5. Unaffected by wear or lining conditions 6. Built-in self-checking signal for easy calibration 7. Fully sealed probe, resistant to dust and moisture, suitable for wet cement grinding after proper treatment **Applications** This instrument is ideal for all types of ball mills used in industries such as cement, metallurgy, power generation, and chemical processing. It is especially well-suited for open and closed grinding systems, including raw mills, cement mills, and coal mills in cement plants. Whether in harsh environments or controlled settings, the BJW-SHZ7/MYC-5 ensures reliable performance and operational efficiency.

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