SL50 – Advanced Sound Level Monitoring
Polwax SL50 is a high-precision sound level transmitter designed for real-time monitoring of noise levels in industrial, environmental, and commercial settings. With a wide measurement range (30–130 dB), robust IP65 housing, and multiple outputs (4–20mA, 0–10V, RS485 Modbus RTU), it ensures seamless integration into SCADA, BMS, and smart city platforms.
Sound Level Transmitter
Atmos Series - SL50
- Easy to Install and suitable for Wall Mounting
- High Accuracy and Stability
- Wide Measuring Range
- High-sensitivity microphone
- Compact and Durable Design
- User-Friendly Configuration
The Polwax Sound Level Transmitter Model SL50 is an advanced noise monitoring device designed to measure and transmit real-time sound pressure levels (SPL) in decibels (dB) for industrial, environmental, and commercial applications. With its high-precision microphone and signal processing unit, the Decibel 50 ensures accurate and reliable noise measurements across a wide frequency range.
Equipped with multiple output interfaces including 4-20mA, 0- 10V, RS485 (Modbus RTU), and MQTT over Wi-Fi, the NoiseTrans50 seamlessly integrates with industrial automation systems, environmental monitoring platforms, and smart city infrastructure. Its robust IP65- rated enclosure allows for deployment in both indoor and outdoor environments, making it suitable for factories, airports, traffic monitoring, hospitals, educational institutions, and more.
Product Overview
Polwax SL50 from the Atmos Series is a rugged, high-accuracy sound level transmitter designed for real-time noise monitoring in industrial and environmental applications. It features a wide measurement range of 30–130 dB, high-sensitivity microphone, and multiple output options (4–20 mA, 0–10 V, RS485). Its IP65-rated enclosure makes it ideal for harsh outdoor conditions. Easy to install and integrate, SL50 is perfect for smart city projects, factories, hospitals, and more.
Why Choose Polwax Sound Level Transmitter – Model SL50?
When it comes to precise, real-time noise level monitoring, the Polwax SL50 stands out as a reliable, industrial-grade
solution designed to meet the needs of a wide range of applications. Here’s why you should choose SL50 for your sound
Level monitoring requirements:
1. High-Precision Noise Measurement
✔ Wide Measurement Range (30 dB – 130 dB): Accurately captures ambient noise levels in industrial, commercial, and
environmental settings.
✔ High-Sensitivity Electret Condenser Microphone: Provides superior noise detection with ±1.5 dB accuracy, ensuring
compliance with regulatory standards.
2. Versatile Output & Connectivity Options
✔ Multiple Industry-Standard Outputs:
1) 4-20mA & 0-10V for integration with existing industrial control systems.
2) Rs485 Modbus RTU for communication with SCADA, BMS, and PLCs.
✔ Seamless Integration: Works with smart city monitoring systems, environmental agencies, hospitals, factories, and more
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Technical Data
Measurement Range
30 dB to 130 dB
Accuracy
±1.5 dB
Resolution
0.1 dB
Response Time
≤30 seconds
Microphone Type
Precision Electret Condenser Microphone
Output Options
4-20mA, 0-10V, RS485 (Modbus RTU)
Power Supply
12V-24V DC
Frequency Range
20 Hz - 20 kHz
Operating Temperature
-10°C to 60°C
Storage Temperature
-20°C to 80°C
Humidity Range
0-95% RH (non-condensing)
Protection Rating
Ip65 (water-resistant and dustproof)
Output Signals
Rs485 (Modbus RTU), 4-20mA, 0-5V, 0-10V
Mounting Options
Wall mount, Pole mount
Communication Protocols
MODBUS RTU
Housing Material
Industrial-grade ABS
Process Connection
High-strength, dustproof, waterproof
Features
High Accuracy and Stability
The Polwax SL50 is designed to deliver precise and stable sound level measurements in real-time. Equipped with a high-sensitivity electret condenser microphone, it captures noise levels with an impressive accuracy of ±1.5 dB. Its advanced signal processing technology ensures consistent performance across a wide frequency range (20 Hz to 20 kHz), making it suitable for dynamic environments like industrial plants, urban areas, and healthcare facilities. The device maintains accuracy even under varying temperature and humidity conditions, ensuring dependable data for compliance, safety, and analysis.
Wide Measuring Range
The SL50 offers a broad measuring range from 30 dB to 130 dB, making it ideal for both quiet zones like hospitals and libraries, as well as high-noise environments such as manufacturing plants and traffic-heavy urban areas. This wide dynamic range ensures that the transmitter can accurately detect low ambient sounds and loud industrial noise without distortion or signal loss. Whether you’re monitoring background noise or peak sound levels, the SL50 provides precise, real-time data to support compliance, safety, and noise control initiatives.
User-Friendly Configuration
The SL50 is designed with ease of use in mind, offering flexible configuration options to suit various application needs. Users can quickly set up the device via PC-based software or directly through Modbus registers, allowing seamless integration into existing systems. Configuration parameters such as output signal type, measurement range, and communication settings can be easily adjusted without specialized tools or extensive technical knowledge. This intuitive setup process saves time during installation and ensures reliable operation from day one—ideal for both on-site technicians and remote system integrators.
Applications
Smart City Noise Pollution Monitoring
The Polwax SL50 was deployed across multiple high-traffic areas in the city. The devices were connected via MQTT over Wi-Fi, enabling real-time
monitoring through a centralized dashboard.
Industrial Noise Monitoring
The SL50 was installed in high-noise areas. The 4-20mA output was integrated into the factory's PLC system, enabling automated safety measures such as triggering alarms and activating noise reduction.
