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Smoke online sensors can detect low concentrations of harmful gases
Date: 2025-12-02Read: 0
Smoke online sensor is an electronic device used to detect various gas components in industrial smoke, usually installed in smoke emission pipelines for real-time monitoring. Its main function is to detect harmful gases and pollutants in flue gas online, such as sulfur dioxide (SO ₂), nitrogen oxides (NO ₓ), carbon dioxide (CO ₂), carbon monoxide (CO), particulate matter, etc. It can provide real-time concentration information of various pollutants in flue gas, helping industrial production units comply with environmental regulations in the emission process, reduce pollutant emissions, and improve air quality.
Smoke online sensorWorking principle:
1. Infrared absorption method:
Infrared absorption method is a commonly used gas analysis method in online sensors. Different gases have different absorption characteristics for infrared light, so the concentration of gases can be calculated by measuring the degree of absorption of specific wavelengths of infrared light by smoke samples. Commonly used for monitoring gases such as carbon dioxide (CO ₂), carbon monoxide (CO), methane (CH ₄), etc.
2. Chemiluminescence method:
The chemiluminescence method is mainly used for the detection of nitrogen oxides (NO ₓ). When NO reacts with reagents, it produces light, and the intensity of this light is proportional to the concentration of NO. By detecting the intensity of light, the concentration of gas can be calculated. This method has high sensitivity and selectivity, and is suitable for real-time monitoring of nitrogen oxides.
3. Electrochemical method:
Electrochemical method involves the reaction between gas molecules and electrodes, resulting in changes in current or voltage. The gas concentration is determined by measuring the changes in current or voltage. Electrochemical sensors are commonly used to detect gases such as sulfur dioxide (SO ₂) and carbon monoxide (CO). They have high sensitivity and selectivity, and are small in size, making them suitable for convenient installation and use.
4. UV absorption method:
UV absorption method is another commonly used smoke monitoring method, especially suitable for monitoring gases such as ozone (O3) and nitrogen oxides (NOx). The ultraviolet light source penetrates the smoke sample, and the gas absorbs specific wavelengths of ultraviolet light, with the degree of absorption proportional to the gas concentration. This method is widely used in the fields of air quality monitoring and environmental protection.
5. Laser scattering method:
Laser scattering method is mainly used for monitoring particulate matter (PM). The particles in the smoke will scatter under laser irradiation, and the concentration of particles can be calculated by detecting the intensity of the scattered light. This method has high sensitivity in detecting the concentration of particulate matter in flue gas.
The main features of online smoke sensors are:
1. Real time monitoring:
Continuous real-time monitoring can be conducted during the process of flue gas emissions, providing immediate feedback. This real-time capability enables enterprises to timely understand the concentration of emissions and take effective measures to avoid exceeding pollution standards.
2. High sensitivity:
Capable of detecting low concentrations of harmful gases, ensuring emissions concentrations are within the prescribed range, and reducing environmental pollution. This high sensitivity is key to ensuring compliance with environmental protection regulations.
3. High stability:
They need to operate in harsh industrial environments for a long time, so they usually have high stability and durability, and can adapt to harsh conditions such as high temperature, high humidity, and corrosive gases.
4. Low maintenance requirements:
Multiple self calibration and self diagnostic functions have been adopted, reducing the need for manual maintenance. At the same time, the design of sensors increasingly emphasizes long-term stable operation, reducing equipment maintenance costs.
5. Automatic data collection and transmission:
It can automatically collect data and transmit it in real-time to the control system through the communication module, making it easy for monitoring personnel to analyze and process. This function is particularly important for large-scale industrial production and environmental management.