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Optical Analysis
DOAS Gas Analyzer
Instrava provided the doas gas analyzer based on advanced UV Differential Optical Absorption Spectroscopy (DOAS) technology provides highly accurate and stable measurement of key gases such as SO₂, NOx, O₂, CO, and CO₂ in industrial emissions.
Designed for hot-wet extractive sampling systems, this analyzer eliminates gas loss caused by condensation, ensuring true and reliable measurement results, especially for SO₂ and reactive gases.
With a long-life xenon light source (up to 10 years), no moving optical parts, and automatic calibration capabilities, it delivers low maintenance, high reliability, and long-term stability, making it ideal for CEMS (Continuous Emission Monitoring Systems) and industrial process optimization.
Optical Analysis Description
Advanced Multi-Gas Analysis with DOAS Technology
This industrial DOAS gas analyzer integrates UV-DOAS + NDIR + electrochemical/zirconia technologies, enabling comprehensive gas monitoring in complex environments.
Multi-gas detection capability:
UV DOAS: SO₂, NO, NO₂ (NOx)
Zirconia / Electrochemical: O₂, H₂O
NDIR: CO, CO₂
Key technical advantages:
Full-spectrum absorption analysis improves accuracy and selectivity
Automatic high/low range switching for wide concentration monitoring
PLS algorithm eliminates cross-interference from dust, moisture, and background gases
Stable performance in high humidity and high dust flue gas conditions
Application scenarios:
Power plants (coal-fired boiler emission monitoring)
Petrochemical and coal chemical industries
Industrial flue gas analysis
Environmental compliance monitoring systems (CEMS)
Industrial Reliability & System Integration Advantages
Engineered for continuous industrial operation, this online DOAS gas analyzer system offers strong system compatibility and long-term reliability.
Performance & operational advantages:
Automatic calibration function reduces manual maintenance
Adjustable calibration cycle for long-term stable operation
No moving optical parts → higher durability and lower failure rate
Modular design with integrated heating system for hot-wet sampling
System integration capabilities:
Multiple outputs: 4–20mA, RS232, RS485 (Modbus)
Supports PLC / DCS / SCADA systems
Multi-channel relay and switch inputs for automation control
Optical fiber gas cell design for easy maintenance and replacement
DOAS vs NDIR (Core Advantage):
No condensation → no SO₂ loss
Higher wavelength resolution → better linearity and accuracy
Strong anti-interference → stable in moisture and dust environments
Lower maintenance → simplified sampling system
Optical Analysis Parameter
UV DOAS Gas Analyzer (SO₂ / NOx)
| Parameter | Specification |
|---|---|
| Technology | UV-DOAS |
| Installation | Hot-wet extractive |
| Measurement Range | 0–100 ppm / 0–200 ppm / 0–1000 ppm / 0–3000 ppm |
| Accuracy | ≤ ±1% |
| Linearity | ≤ ±1% F.S |
| Response Time | ≤ 60 s (T90) |
| Zero Drift | ≤ ±2% F.S |
| Span Drift | ≤ ±2% F.S |
O₂ / H₂O Analyzer
| Parameter | Specification |
|---|---|
| Technology | Zirconia / Electrochemical |
| O₂ Range | 0–25% |
| H₂O Range | 0–40% |
| Response Time | ≤ 60 s |
| Linearity | ≤ ±2% F.S |
CO / CO₂ Analyzer
| Parameter | Specification |
|---|---|
| Technology | NDIR |
| CO Range | 0–1000 ppm |
| CO₂ Range | 0–20% |
| Accuracy | ≤ ±1% |
| Response Time | ≤ 60 s |
| Linearity | ≤ ±2% F.S |
System Technical Data
| Parameter | Specification |
|---|---|
| SO₂ / NO Detection Range | 0–50 ppm to 0–5% |
| O₂ Range | 0–25% |
| Repeatability | ≤ 1% |
| Response Time | < 60 s |
| Ambient Temperature | 5°C ~ 45°C |
| Analog Output | 3 × 4–20mA |
| Analog Input | 2 × 4–20mA |
| Digital I/O | 4 inputs / 8 relay outputs |
| Communication | RS232 / RS485 (Modbus) |
| Power Supply | 220VAC, 50Hz |
| Power Consumption | 100W |
| Protection Grade | IP42 |
| Size | 19” 4U rack |
| Gas Interface | Ø6 mm |
Instrava OEM/ODM
Instrava Engineering & Customization Support
At Instrava, our instruments are developed with a strong focus on real industrial applications. Each product is designed to operate as a reliable component within measurement, control, and automation systems, rather than as a standalone device.
Our engineering team supports customers during product selection by evaluating process conditions, operating environments, and system requirements, ensuring stable and long-term performance in actual use.
In addition to standard configurations, Instrava offers flexible customization options, including measurement range, materials, output signals, communication interfaces, and installation methods. All custom solutions are engineered to meet industrial standards and application-specific demands.
We also support OEM projects and system integration, providing consistent product design, technical documentation, and long-term supply to ensure smooth integration and reliable operation throughout the project lifecycle.
Related Product Recommendations
A doas gas analyzer uses UV differential optical absorption spectroscopy to measure gas concentrations based on their unique absorption spectra. It provides high accuracy and strong anti-interference performance, especially for SO₂ and NOx monitoring.
Unlike traditional systems, the DOAS analyzer uses hot-wet sampling, preventing condensation and eliminating SO₂ loss, ensuring more accurate emission data.
A DOAS gas analyzer offers full-spectrum analysis, higher resolution, and better anti-interference, while NDIR analyzers rely on band-pass filters and are more sensitive to moisture and cross-gas interference.
Yes. It is widely used in continuous emission monitoring systems (CEMS) due to its high stability, low drift, and reliable long-term operation in industrial environments.
Common applications include power plants, petrochemical industries, coal chemical processing, and environmental monitoring projects, especially where accurate flue gas analysis is required.
The built-in automatic calibration function continuously corrects zero drift and maintains measurement accuracy, reducing manual intervention and ensuring long-term reliable operation.
Why Choose Instrava
By choosing Instrava, you gain a partner with a deep understanding of industrial applications and the expertise to meet today’s operational challenges.
Our role extends beyond products—we support your success through dependable solutions and long-term commitment.
Engineering-Driven Innovation
Innovation at Instrava is guided by real industrial requirements. We continuously refine our technologies to address evolving operational challenges, ensuring practical and reliable performance in demanding environments.
Application-Specific Customization
We provide engineering-level customization to match specific process conditions. From measurement range and materials to output signals and installation options, our solutions are configured to fit real applications.
Proven Quality and Reliability
Quality and reliability are fundamental to every Instrava product. Manufactured under strict quality control and thoroughly tested, our instruments deliver accurate, stable, and long-term performance.
Global Capability with Local Support
Instrava combines global engineering expertise with responsive local support, ensuring our partners benefit from internationally aligned technology and timely regional service.
Comprehensive Product Portfolio
Our broad portfolio of measurement and control instruments enables us to address a wide range of industrial needs, providing integrated solutions from a single, reliable source.
Partner-Oriented Engineering Support
We work closely with our partners from technical consultation to after-sales support. Our focus is on delivering solutions that create lasting value and support long-term operational success.
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