Automatic Environmental Air Quality Monitoring System Measurement Device Outdoor Automatic Environmental Noise Monitor
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Standards compliance: Complies with IEC61672 Sound Level Meters and JJG188-2002 Sound Level Meters Class 1; GB/T3241 Octave-band and Fractional-octave-band Filters Class 1.
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Microphone: All-weather outdoor unit with rainproof, windproof, and bird-deterrent functions.
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Statistical analysis measurements: Leq, L5, L10, L50, L90, L95, SD, Lmax, Lmin, as well as PNL and EPNL.
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Spectrum analysis: Real-time 1/3 octave band spectrum analysis (optional).
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System calibration: Built-in electrostatic actuator for automatic or manual calibration; can also be calibrated using an acoustic calibrator.
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Data storage: Can store up to 2 months of raw data.
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Data download: Data can be downloaded via RS232 or USB port without affecting ongoing measurements.
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Output interface: RS232C, built-in modem.
>>Main technical parameters
| Parameter | Description |
| Measurement Range | 1 kHz sensitivity (reference: -32 dB): 27 dB ~ 135 dB (A), 33 dB ~ 135 dB (C), 44 dB ~ 135 dB (Z) (reference 2×10⁻⁵ Pa) 31.5 Hz: 27 dB ~ 92 dB (A); 4 kHz: 27 dB ~ 135 dB (A); 8 kHz: 27 dB ~ 134 dB (A); 12.5 kHz: 27 dB ~ 130 dB (A) |
| Frequency Linear Range | 20 Hz ~ 12.5 kHz |
| Peak C Sound Level Range | 64 dB ~ 137 dB |
| Self-noise (Electrical) | A-weighting: <8 µV, C-weighting: <14 µV, Z-weighting: <93 µV |
| Accuracy | Complies with GB/T 3785.1-2010 Class 2, IEC 61672-1:2013 Class 2 |
| Display | 128×64 dot matrix OLED |
| Hardware Interface | USB |
| Data Output | RS485 |
| Calibration | Using Class 2 or higher acoustic calibrator |
| Operating Conditions | Temperature: -10 °C ~ +50 °C; Relative humidity: 25% ~ 90%; Atmospheric pressure: 65 kPa ~ 108 kPa |
| Electrical Input | V (with preamplifier, shorted via 20 pF capacitor) |
| Frequency Weighting | A, C, Z weighting |
| Time Weighting | F (Fast), S (Slow), I (Impulse) |
| Reference Direction | Axial direction of the condenser microphone |
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