ST-591 Noise Dosimeter
IEC 61252-1 2017 Standard for Occupational Noise Exposure Measurement
Overview
ST-591 noise dosimeter is designed for workplace and industrial hygiene noise monitoring. It supports real-time 1/1 and 1/3 octave band analysis for precise noise evaluation. It also allows users to set and evaluate two noise threshold profiles simultaneously for flexible.
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User-Friendly Interface
The LCD screen shows real-time noise exposure data, with simple navigation for reviewing measurements and configuring settings.
Mircophone
1/2-inch prepolarized condenser microphone offering precise sound measurements in 20 Hz ~ 12.5 kHz frequency range.
Data & Charging Port
The USB-C port supports fast data and audio file transfers, powered by 64GB of internal memory. It also serves as a charging port, streamlining your workflow and minimizing downtime.
Rugged Housing
Built for tough environments, the ST-591 features lightweight and durable design with IP65 protection. Its compact size ensures comfort during all-day wear in the field.
Why Choose ST-591?
IEC Compliance
Meet the IEC 61252-1 2017 standard for personal noise dosimeter.
IP65 Certified
Water-resistant protection making it durable for use in tough environments.
Audio Recorder
Record in WAV format with with synchronized and trigger modes
Long Runtime
Up to 10 hours of operation to support full-shift usage
Key Features
Supports International Standards
Compliance with Multiple Regulations
The dual-channel design allows you to evaluate the same measurement using two different profiles, making it easier to comply with regulations such as OSHA, NIOSH, MSHA, ACGIH, and EU Directive 2003/10/EC.
Advanced Noise Analyzer
Designed for Professionals
ST-591 provides detailed noise exposure evaluation through integral, statistical, 1/1 OCT, and 1/3 OCT band analysis, all in a lightweight, portable device.
Full-Shift Operation
10h Battery & 64 GB Memory
ST-591 noise dosimeter is easy to wear near the worker’s shoulder and ensures dependable daily-shift operation. It records and logs data throughout the workday with 64 GB internal memory.
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Accurately assess noise exposure and meet compliance standards with the ST-591 personal dosimeter.
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Efficient Noise Data Management on Your PC
ScarletSound is a free software developed for ST-591 noise dosimeter, enabling occupational noise exposure assessment directly from your computer.
With ScarletSound, users can:
– Easily manage and organize noise data logs
– Review of 1/1 & 1/3 OCT analysis
– Access and playback recorded audio files
– Export data for documentation or further analysis”
Precise 1/1 & 1/3 OCT Analysis
ST-591 features 1/1 and 1/3 octave band analysis, which divides the sound spectrum into smaller bands for detailed monitoring and analysis.
Built for Safety Standards Compliance
Compliant with OSHA, NIOSH, MSHA, and more noise exposure standards, the ST-591 ensures regulatory adherence while protecting employees from noise-induced hearing loss (NIHL). With its dual independent channels, ST-591 evaluates same noise exposure under different configurations, providing flexibility for standard-compliant noise assessments.
Frequently Asked Questions
Find quick answers below, or visit our FAQ page for more.
Can the ST-591 support different noise standards?
Yes. The ST-591 allows you to evaluate same measurement with 2 different exchange rate, threshold, and criterion level.
How do I export data and audio recordings?
Use ScarletSound PC software to view all noise assessment and easily export data or audio files.
How should I wear ST-591 noise dosimeter for accurate measurement?
Attach the ST‑591 to the worker’s clothing on the shoulder or collar and ensure the microphone is positioned near the ear to accurately capture noise exposure.
Specifications
- ST-591
- Hardware
- Features
- Package List
- FAQ
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| Item | Description |
|---|---|
| Standards | IEC 61672-1:2013 Class 2; IEC 61252-1:2017; IEC 61260-1:2014 Class 2 |
| Measurement range | 54 to 142 dB (A); 54 to 142 dB (C); 57 dB to 142 dB (Z); 71 to 145 dBC (C peak) |
| Measurement modes | Sound exposure, integral, statistics, 1/1 OCT analysis, 1/3 OCT analysis |
| Main parameters of measurement | Lxyp, Lxeq,T, Lxymax, Lxymin, LN, SEL, Lex,8h, LAVG, TWA, DOSE, SD, Lxpeak, NLApeak>120, NLApeak>130, NLApeak>140, gravityX, gravityY, gravity; N = 5, 10, 50, 90, 95 |
| Frequency range | 20 Hz to 12.5 kHz |
| Frequency weightings | A, C, Z |
| Time weightings | F (Fast), S (Slow), I (Impulse) |
| Measurement time | 1s ~ 99 hrs (Adjustable) |
| Audio recording | WAV format; trigger / sync mode; Sampling rates: 12 kHz 16-bit / 24 kHz 16-bit / 48 kHz 32-bit |
| Item | Description |
|---|---|
| Display | 1.3-inch TFT LCD, 240×240 pixels, full color |
| Microphone | 1/2 inch prepolarized condenser microphone Sensitivity level: -33.0 to -33.9 dB" |
| Storage capacity | Supports 64 GB TF card |
| Output interface | USB Type-C, Bluetooth |
| Power supply | Rechargeable lithium battery (3.7 V, 1000 mAh); Operation time: 10 hours; Charging: USB Type-C (5V, 1A) |
| Ingress protection | IP65 |
| Operating environment | Temperature: -10 °C to 40 °C; Humidity: 20% to 90% RH (non-condensed); Air pressure: 65 to 108 kPa |
| Dimensions | 90 × 49 × 64 mm |
| Weight | 119 g |
| Features |
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| ▪ IEC 61252-1 2017 Standard |
| ▪ IP65 Ingress Protection |
| ▪ 240x240 pixels full-color display |
| ▪ 1 sec - 99 hrs adjustable measurement time |
| ▪ Data logging & audio recording functions |
| ▪ Real-time 1/1 OCT & 1/3 OCT analysis |
| Package List |
|---|
| ▪ ST-591 Noise Dosimeter |
| ▪ Windscreen |
| ▪ USB-C cable |
| ▪ Shoulder strap |
| ▪ Calibration certificate |
| ▪ User guide |
| ▪ Waterproof carrying case |
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The ST-591 is a professional-grade personal noise dosimeter designed to monitor occupational noise exposure in industrial and workplace environments. It supports octave band analysis and complies with global safety standards.
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Yes. The ST-591 capables to evaluate same measurement with 2 different exchange rate, threshold, and criterion level. This makes it easier to meet two regulations such as OSHA, NIOSH, MSHA, and DOD from a single measurement session.
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Yes. The ST-591 has built-in audio recording in WAV format. You can use it to document specific noise events for further analysis. It stores audio and data on 64 GB of internal memory.
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Use the free ScarletSound software on your PC to manage data logs, review 1/1 and 1/3 octave band analysis, access recorded audio, and export data for reporting or compliance.
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Yes. It includes both 1/1 and 1/3 octave band analysis, allowing for detailed evaluation of the noise spectrum and frequency-specific exposure.
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Absolutely. The ST-591 meets IEC 61252-1:2017 requirements and provides reliable performance for international occupational noise regulations.
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It runs for up to 10 hours on a full charge—suitable for all-day shifts in industrial environments.
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Yes. The ST-591 features IP65-rated housing, offering resistance against dust and water, making it ideal for rugged field use.
ST-12D Class 1 Sound Analyzer
ST-12D is the Class 1 IEC 61672-1 standard sound level meter with measurement range from 25 to 140 dB. It delivers comprehensive noise measurements, including Leq, Lpeak, Lmax, Ln, L10, DOSE, and more. For in-depth frequency analysis, the ST-12D also offers optional 1/1 and 1/3 octave band measurements, making it the perfect tool for detailed acoustic monitoring.
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