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UV-DOAS Gas Sensor

UV-DOAS Gas Sensor

UV DOAS gas sensor
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UV-DOAS Gas Sensor

Introduction

The ESEGAS UV-GAS-100M UV-DOAS Gas Sensor is an OEM ultraviolet gas analysis module designed for integration into industrial emission analyzers and environmental monitoring systems. Based on Ultraviolet Absorption Spectroscopy and Differential Optical Absorption Spectroscopy (UV-DOAS), it measures gases such as SO₂, NO, NO₂, H₂S, Cl₂, and NH₃. One module can measure up to five gas components simultaneously, depending on the configuration. Its optical measurement technology and spectral analysis algorithms provide high selectivity, low detection limits, fast response, and stable performance for continuous industrial emission monitoring.

Measured Gas: SO2 | NO | NO2 | H2S | Cl2 | NH3
Technology: UV-DOAS

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Principle

UV-GAS-100M Ultraviolet(UV) sensor   is an independently self-developed flue gas analysis product which is suitable for online gas analysis of environmental protection and industrial control sites. Based on Ultraviolet Absorption Spectroscopy and Differential Optical Absorption Spectroscopy, it adopts optical technology platform, and can conduct online analysis and measurement for gases including SO2, NO, NO2, H2S, Cl2 and NH3, etc. Under normal conditions, it is used to measure gas component of SO2, NOX and other gas components can be extended. One module can simultaneously carry out measurement for 5 gas components at maximum. The product owns features of high measurement accuracy and reliability, fast response and wide application.

Specifications

Product Model UV-GAS-100M (measure SO2, NO, NO2, CL2, H2S)
Measuring Principle UV-DOAS
Technical Index Linearity error ≤ ±2%FS
Repeatability ≤ 0.5%
Stability ≤ 2%
Zero drift ≤ ±2%FS
Span drift ≤ ±2%FS
Response time < 25s
Weight 3.2kg
Dimension 420mm*160mm*80mm
 
 
 
 

 Features

The product adopts advanced online analysis technology with high accuracy, a low lower limit, and small temperature drift
● Adopt Ultraviolet Absorption Spectrum Gas Analysis Technology and Chemometrics Algorithms. The water or dust does not affect the measurement accuracy. With a low detection 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 the 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 from water and dust.
● The detector is connected to the gas chamber via the optical fiber, which is convenient for replacement and achieves a 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. Then, the accumulation method obtains NOX, dispensing with the 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

Advantages

  • Modular design for easy integration
  • Long-path absorption gas chamber, high detection accuracy, measurement of multiple gasessimultaneously
  • No optical moving parts, high reliability.
  • Small size, light weight, easy to carry and maintain
  • Strong gas chamber, easy maintenance
  • Core modules and algorithms developed independently

UV gas sensor

Components

ESEGAS Ultraviolet(UV) 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 UV-DOAS (Ultraviolet Differential Optical Absorption Spectroscopy) principles to analyze the gas composition.

Here are the 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.

Q&As

A UV-DOAS gas sensor is an ultraviolet optical measurement module that uses Differential Optical Absorption Spectroscopy to identify and quantify gases through their characteristic UV absorption spectra.

Depending on the configuration, UV-DOAS sensors can measure SO₂, NO, NO₂, H₂S, NH₃, and Cl₂.

The sensor directs ultraviolet light through a gas sample and analyzes the absorption spectrum. Differential spectral analysis identifies the target gas and determines its concentration.

UV-DOAS uses ultraviolet absorption and is suitable for gases such as SO₂ and NOₓ. NDIR uses infrared absorption and is commonly applied to CO, CO₂, and CH₄ measurement.

Yes. A suitably configured UV-DOAS module can analyze multiple UV-absorbing gas components using their characteristic absorption features.

Typical applications include industrial emission analyzers, CEMS, power plants, waste incineration facilities, chemical manufacturing, and environmental monitoring equipment.

Still having questions? Please just contact us directly!

Principle

UV-GAS-100M Ultraviolet(UV) sensor   is an independently self-developed flue gas analysis product which is suitable for online gas analysis of environmental protection and industrial control sites. Based on Ultraviolet Absorption Spectroscopy and Differential Optical Absorption Spectroscopy, it adopts optical technology platform, and can conduct online analysis and measurement for gases including SO2, NO, NO2, H2S, Cl2 and NH3, etc. Under normal conditions, it is used to measure gas component of SO2, NOX and other gas components can be extended. One module can simultaneously carry out measurement for 5 gas components at maximum. The product owns features of high measurement accuracy and reliability, fast response and wide application.

Specifications

Product Model UV-GAS-100M (measure SO2, NO, NO2, CL2, H2S)
Measuring Principle UV-DOAS
Technical Index Linearity error ≤ ±2%FS
Repeatability ≤ 0.5%
Stability ≤ 2%
Zero drift ≤ ±2%FS
Span drift ≤ ±2%FS
Response time < 25s
Weight 3.2kg
Dimension 420mm*160mm*80mm

 

 

 

 

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