Model ESE-UV-500M -UV-DOAS Gas Sensor

The product adopts advanced online analysis technology with high accuracy; low lower limit and small temperature drift

• Adopt Ultraviolet Absorption Spectrum Gas Analysis Technology and Chemometrics Algorithms. The measurement accuracy is not affected by water or dust. With low detection lower limit and small temperature drift.
• High range ratio (the maximum is 10:1).

Strong gas chamber, low operation and maintenance cost.

• The gas chamber of module is made of stainless steel and the internal part is not required for mirror polish and gold plating. The gas chamber is very strong, with low cost and little effect by water and dust.
• The detector is connected to the gas chamber via the optical fiber, which is convenient for replacement and achieves low maintenance cost.

The service life of the light source is up to 10 years

• The light source adopts the pulse xenon lamp, with long service life, good stability and no preheating time.

Achieve simultaneous measurement of NO and NO2

• Carry out simultaneous measurement of NO and NO2, and then obtain NOX by the accumulation method, dispensing with NO2→NO converter

No optical moving parts, strong vibration resistance and high measurement reliability,Modular design, good expansibility and convenient maintenance

• Configured to produce diversified and customized products to meet all kinds of requirements.

Applications

• Continuous flue gas emission monitoring (CEMS) for power plants (analyze SO2, NO, NO2 and O2)
• DeSOX process monitoring (analyze SO2 and O2)
• DeNOX process monitoring (analyze NO, NO2, NH3 and O2)
• Continuous flue gas emission monitoring of waste incineration (analyze SO2, NO, NO2 and O2)
• Trace Cl2 analysis in PVC process and titanium dioxide production process in chlor-alkali plants (analyze Cl2)
• Gas analysis in sulfur recovery process (analyze SO2 and H2S)
• Gas analysis in natural gas purification process (analyze trace H2S)
• Methyl iodide analysis in coal chemical industry (analyze CH3I)
• On-line atmospheric air monitoring (analyze SO2, NO2 and O3), etc

 UV-DOAS (Ultraviolet Differential Optical Absorption Spectroscopy) gas sensor is a type of gas sensor that utilizes ultraviolet (UV) light to measure the concentration of specific gases in a gas sample. It employs the principles of absorption spectroscopy to analyze the gas composition.

Here are the key features and components of a UV-DOAS gas sensor:

1. UV Light Source: The sensor incorporates a UV light source that emits light at specific wavelengths in the UV range. These wavelengths are chosen to match the absorption bands of the target gas molecules.
2. Gas Cell: The gas cell is a chamber or path where the gas sample interacts with the UV light. It is designed to optimize the path length and interaction between the gas molecules and the UV light.
3. Optical Components: The sensor includes optical components such as mirrors, lenses, and filters to direct and focus the UV light onto the gas sample and then onto the detector. These components are designed to maximize the sensitivity and accuracy of the measurements.
4. Detector: A detector is used to measure the intensity of the UV light before and after it passes through the gas sample. The absorption of UV light by the target gas molecules leads to a reduction in the transmitted light intensity. The detector detects this reduction and converts it into an electrical signal.
5. Spectrometer: The electrical signal from the detector is processed by a spectrometer, which analyzes the spectrum of the UV light and calculates the gas concentrations based on the measured absorption.
6. Data Processing and Display: The gas sensor includes data processing capabilities and software algorithms to analyze the measured UV spectra and calculate the gas concentrations. The results are typically displayed on a built-in display unit, allowing users to monitor gas concentrations in real-time.

UV-DOAS gas sensors are commonly used for the detection and measurement of gases such as nitrogen dioxide (NO2), sulfur dioxide (SO2), ozone (O3), and volatile organic compounds (VOCs). They find applications in environmental monitoring, industrial processes, air quality assessment, and emission control. These sensors offer accurate and reliable gas concentration measurements, helping to ensure safety, compliance, and environmental protection in various settings.