รู้ก่อนใคร! UV DOAS เปลี่ยนอนาคตการวัดมลพิษ
Know This First! UV DOAS is Revolutionizing the Future of Emissions Measurement
Monitoring and regulating industrial emission control is becoming increasingly important in a period of significant air pollution challenges. The CEMS (Continuous Emissions Monitoring System) is a device that continually monitors emissions to verify that environmental criteria are met successfully. UV DOAS is one of the most prominent technologies used in CEMS systems due to its excellent accuracy and ability to test many gases simultaneously with a single instrument.
What is UV DOAS.
UV DOAS stands for Ultraviolet Differential Optical Absorption Spectroscopy. It is a technology that analyzes gas concentration in the atmosphere by measuring the absorption of ultraviolet (UV) light
Operating Principles of UV DOAS
- UV light is emitted to pass through the sample gas.
- Each gas absorbs light at a specific wavelength.
- The absorption level corresponds to the concentration of the gas.
- A database is used to compare the absorption intensity at each wavelength.
- The result is accurate concentration data for each gas component in real time.
With this principle, UV DOAS can measure gas concentrations with high precision, even when several gases are present in the air.
What Can UV DOAS Measure?
UV DOAS is suitable for detecting gases that strongly absorb UV light, such as
- SO₂ – Sulfur Dioxide (direct measurement without converter)
- NO and NO₂ (NOx)—Direct measurement without using NOx Converter
- H₂S – Hydrogen Sulfide with a strong odor
- Cl₂ – Chlorine
- O₃ – Ozone
- Volatile Organic Compounds (VOCs)—certain hydrocarbons
Strengths of UV DOAS
- High accuracy, even with multiple gases present
- Capable of measuring multiple gases simultaneously
- No need for NOx Converter: allows direct NO/NO₂ measurement, reducing system complexity and maintenance cost
- Real-time, continuous monitoring
- Advanced Spectrum Analysis: provides highly detailed and precise data
Limitations of UV DOAS
- Requires frequent calibration to maintain accuracy
- May be less effective when compared to NDIR in certain cases
- Requires optical alignment and specific design to ensure measurement precision
Who Should Use UV DOAS
• Industries releasing NOx, SO₂, H₂S, or VOCs
• Power plants, oil refineries, waste incinerators, and chemical industries
• Organizations needing real-time, multi-gas monitoring
• Users seeking alternatives to NOx Converter to simplify system design and improve measurement accuracy
Why Choose UV DOAS
UV DOAS is a proven technology that delivers highly accurate results, is capable of measuring multiple gases at once, and eliminates the need for an NOx Converter, thereby reducing system complexity. It is ideal for modern industrial operations that require efficient, reliable, and environmentally compliant emission monitoring systems. If you're looking for an advanced and all-in-one emission analyzer, UV DOAS is the ideal choice for new-generation industries
Contact Us
ANALYTICAL SYSTEMS ENGINEERING (THAILAND) is a trusted provider of BOD, COD, and UV DOAS analyzers. We offer complete consultation, installation, and service tailored to your specific industrial needs. Let our experts help you meet environmental standards and optimize your system's performance.
For more information or consultation, please contact
• Email: sales@ase-thai.com
• LINE: @ase-thai
• Phone: 083-298-9222
