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ppm C₂H₂ Detection Limit
Continuous Online Monitoring
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Technical Resources
📚 Technical Blog
In-depth articles on DGA principles, photoacoustic spectroscopy, transformer fault diagnosis, and IEC/IEEE standards interpretation
Browse Articles →📄 Document Downloads
International standards, peer-reviewed papers, technical white papers, and product datasheets — one-stop resource center
Download Center →🎥 Video Center
Product demonstrations, technical presentations, installation walkthroughs, and application case studies
Watch Videos →Trusted by the Power Industry
Serving global power utility customers. Products certified to IEC, IEEE, and GB standards.
Substation Installations
Year Laser Lifetime
ppm C₂H₂ Detection Limit
Continuous Online Monitoring
Contact Our Engineering Team
Request a product demonstration, technical consultation, or quotation — our application engineers are ready to assist
Product Portfolio
PASL-3000 Online DGA Monitoring System
Full-component laser photoacoustic spectroscopy dissolved gas analysis system for power transformers. Simultaneously measures 9 key fault gases — H₂, CO, CO₂, CH₄, C₂H₆, C₂H₄, C₂H₂, O₂, N₂ — with optional moisture (H₂O) detection. Compliant with IEC 60567, IEC 60599, IEEE C57.104, DL/T 722, and Q/GDW 10536.
View Specifications →
LPAS Core Detection Module
Ultra-compact integrated laser photoacoustic spectroscopy gas detection module — only 1/5 the footprint of a conventional GC detection unit. Designed for OEM integration into third-party online monitoring systems, portable DGA analyzers, and laboratory dissolved gas analyzers. Hot-swappable, electrically modulated, zero consumables.
Module Details →Technology Comparison: L-PAS vs. Conventional Methods
Performance data sourced from SPIE OIFM 2024 peer-reviewed study (DOI: 10.1117/12.3034328) and HAOMAI laboratory validation
| Performance Metric | Laser PAS (L-PAS) | Gas Chromatography (GC) | Infrared PAS (IF-PAS) |
|---|---|---|---|
| Light Source Linewidth | 15 fm (single spectral line) | — | ~50 nm (broadband + filter) |
| Cross-Interference | ✅ Zero (single-line locking) | ✅ Column separation | ⚠️ Filter overlap region interference |
| Carrier Gas Required | ✅ None | ❌ High-purity He/Ar needed | ✅ None |
| C₂H₂ Detection Limit | < 0.05 ppm | ~0.1 ppm | ~0.5 ppm |
| Repeatability (RSD) | 0.13% | 0.31% | ~0.5% |
| Moving Mechanical Parts | ✅ None (electrical modulation) | ⚠️ Multi-port valves, column oven | ❌ Mechanical chopper + filter wheel |
| Maintenance Interval | > 1 year | 1–3 months | 6 months |
| Annual Operating Cost | Low | High (carrier gas + columns) | Medium |
Technical Resources
📚 Technical Blog
In-depth articles on DGA principles, photoacoustic spectroscopy, transformer fault diagnosis, and IEC/IEEE standards interpretation
Browse Articles →📄 Document Downloads
International standards, peer-reviewed papers, technical white papers, and product datasheets — one-stop resource center
Download Center →🎥 Video Center
Product demonstrations, technical presentations, installation walkthroughs, and application case studies
Watch Videos →Trusted by the Power Industry
Serving global power utility customers. Products certified to IEC, IEEE, and GB standards.
Substation Installations
Year Laser Lifetime
ppm C₂H₂ Detection Limit
Continuous Online Monitoring
Contact Our Engineering Team
Request a product demonstration, technical consultation, or quotation — our application engineers are ready to assist
Why Laser Photoacoustic Spectroscopy (L-PAS)?
Compared to conventional gas chromatography and infrared photoacoustic spectroscopy, L-PAS represents the next generation of online DGA monitoring technology
Laboratory-Grade Precision
Semiconductor laser spectral linewidth of only 15 fm (0.000015 nm) precisely targets characteristic absorption lines of each fault gas with zero cross-interference. Acetylene (C₂H₂) detection limit < 0.05 ppm, meeting the stringent sensitivity requirements of UHV substations and HVDC converter stations.
Zero Carrier Gas Consumption
Pure electrical modulation of laser sources eliminates the need for chromatography columns, high-purity carrier gases (H₂/He/Ar), and mechanical choppers. Annual operating costs are approximately 1/10th of conventional online gas chromatography systems.
Maintenance-Free Design
No moving mechanical parts — electrical modulation replaces the optical chopper. All-solid-state laser sources with a rated lifetime exceeding 10 years. Modular architecture with hot-swappable components. MTBF > 50,000 hours.
Product Portfolio
PASL-3000 Online DGA Monitoring System
Full-component laser photoacoustic spectroscopy dissolved gas analysis system for power transformers. Simultaneously measures 9 key fault gases — H₂, CO, CO₂, CH₄, C₂H₆, C₂H₄, C₂H₂, O₂, N₂ — with optional moisture (H₂O) detection. Compliant with IEC 60567, IEC 60599, IEEE C57.104, DL/T 722, and Q/GDW 10536.
View Specifications →LPAS Core Detection Module
Ultra-compact integrated laser photoacoustic spectroscopy gas detection module — only 1/5 the footprint of a conventional GC detection unit. Designed for OEM integration into third-party online monitoring systems, portable DGA analyzers, and laboratory dissolved gas analyzers. Hot-swappable, electrically modulated, zero consumables.
Module Details →Technology Comparison: L-PAS vs. Conventional Methods
Performance data sourced from SPIE OIFM 2024 peer-reviewed study (DOI: 10.1117/12.3034328) and HAOMAI laboratory validation
| Performance Metric | Laser PAS (L-PAS) | Gas Chromatography (GC) | Infrared PAS (IF-PAS) |
|---|---|---|---|
| Light Source Linewidth | 15 fm (single spectral line) | — | ~50 nm (broadband + filter) |
| Cross-Interference | ✅ Zero (single-line locking) | ✅ Column separation | ⚠️ Filter overlap region interference |
| Carrier Gas Required | ✅ None | ❌ High-purity He/Ar needed | ✅ None |
| C₂H₂ Detection Limit | < 0.05 ppm | ~0.1 ppm | ~0.5 ppm |
| Repeatability (RSD) | 0.13% | 0.31% | ~0.5% |
| Moving Mechanical Parts | ✅ None (electrical modulation) | ⚠️ Multi-port valves, column oven | ❌ Mechanical chopper + filter wheel |
| Maintenance Interval | > 1 year | 1–3 months | 6 months |
| Annual Operating Cost | Low | High (carrier gas + columns) | Medium |
Technical Resources
📚 Technical Blog
In-depth articles on DGA principles, photoacoustic spectroscopy, transformer fault diagnosis, and IEC/IEEE standards interpretation
Browse Articles →📄 Document Downloads
International standards, peer-reviewed papers, technical white papers, and product datasheets — one-stop resource center
Download Center →🎥 Video Center
Product demonstrations, technical presentations, installation walkthroughs, and application case studies
Watch Videos →Trusted by the Power Industry
Serving global power utility customers. Products certified to IEC, IEEE, and GB standards.
Substation Installations
Year Laser Lifetime
ppm C₂H₂ Detection Limit
Continuous Online Monitoring
Contact Our Engineering Team
Request a product demonstration, technical consultation, or quotation — our application engineers are ready to assist
Laser Photoacoustic Spectroscopy
Transformer DGA Online Monitoring
PASL-3000 | Laboratory-Grade Precision · Zero Carrier Gas · Maintenance-Free Operation
Why Laser Photoacoustic Spectroscopy (L-PAS)?
Compared to conventional gas chromatography and infrared photoacoustic spectroscopy, L-PAS represents the next generation of online DGA monitoring technology
Laboratory-Grade Precision
Semiconductor laser spectral linewidth of only 15 fm (0.000015 nm) precisely targets characteristic absorption lines of each fault gas with zero cross-interference. Acetylene (C₂H₂) detection limit < 0.05 ppm, meeting the stringent sensitivity requirements of UHV substations and HVDC converter stations.
Zero Carrier Gas Consumption
Pure electrical modulation of laser sources eliminates the need for chromatography columns, high-purity carrier gases (H₂/He/Ar), and mechanical choppers. Annual operating costs are approximately 1/10th of conventional online gas chromatography systems.
Maintenance-Free Design
No moving mechanical parts — electrical modulation replaces the optical chopper. All-solid-state laser sources with a rated lifetime exceeding 10 years. Modular architecture with hot-swappable components. MTBF > 50,000 hours.
Product Portfolio
PASL-3000 Online DGA Monitoring System
Full-component laser photoacoustic spectroscopy dissolved gas analysis system for power transformers. Simultaneously measures 9 key fault gases — H₂, CO, CO₂, CH₄, C₂H₆, C₂H₄, C₂H₂, O₂, N₂ — with optional moisture (H₂O) detection. Compliant with IEC 60567, IEC 60599, IEEE C57.104, DL/T 722, and Q/GDW 10536.
View Specifications →LPAS Core Detection Module
Ultra-compact integrated laser photoacoustic spectroscopy gas detection module — only 1/5 the footprint of a conventional GC detection unit. Designed for OEM integration into third-party online monitoring systems, portable DGA analyzers, and laboratory dissolved gas analyzers. Hot-swappable, electrically modulated, zero consumables.
Module Details →Technology Comparison: L-PAS vs. Conventional Methods
Performance data sourced from SPIE OIFM 2024 peer-reviewed study (DOI: 10.1117/12.3034328) and HAOMAI laboratory validation
| Performance Metric | Laser PAS (L-PAS) | Gas Chromatography (GC) | Infrared PAS (IF-PAS) |
|---|---|---|---|
| Light Source Linewidth | 15 fm (single spectral line) | — | ~50 nm (broadband + filter) |
| Cross-Interference | ✅ Zero (single-line locking) | ✅ Column separation | ⚠️ Filter overlap region interference |
| Carrier Gas Required | ✅ None | ❌ High-purity He/Ar needed | ✅ None |
| C₂H₂ Detection Limit | < 0.05 ppm | ~0.1 ppm | ~0.5 ppm |
| Repeatability (RSD) | 0.13% | 0.31% | ~0.5% |
| Moving Mechanical Parts | ✅ None (electrical modulation) | ⚠️ Multi-port valves, column oven | ❌ Mechanical chopper + filter wheel |
| Maintenance Interval | > 1 year | 1–3 months | 6 months |
| Annual Operating Cost | Low | High (carrier gas + columns) | Medium |
Technical Resources
📚 Technical Blog
In-depth articles on DGA principles, photoacoustic spectroscopy, transformer fault diagnosis, and IEC/IEEE standards interpretation
Browse Articles →📄 Document Downloads
International standards, peer-reviewed papers, technical white papers, and product datasheets — one-stop resource center
Download Center →🎥 Video Center
Product demonstrations, technical presentations, installation walkthroughs, and application case studies
Watch Videos →Trusted by the Power Industry
Serving global power utility customers. Products certified to IEC, IEEE, and GB standards.
Substation Installations
Year Laser Lifetime
ppm C₂H₂ Detection Limit
Continuous Online Monitoring
Contact Our Engineering Team
Request a product demonstration, technical consultation, or quotation — our application engineers are ready to assist
Laser Photoacoustic Spectroscopy
Transformer DGA Online Monitoring
PASL-3000 | Laboratory-Grade Precision · Zero Carrier Gas · Maintenance-Free Operation
Why Laser Photoacoustic Spectroscopy (L-PAS)?
Compared to conventional gas chromatography and infrared photoacoustic spectroscopy, L-PAS represents the next generation of online DGA monitoring technology
Laboratory-Grade Precision
Semiconductor laser spectral linewidth of only 15 fm (0.000015 nm) precisely targets characteristic absorption lines of each fault gas with zero cross-interference. Acetylene (C₂H₂) detection limit < 0.05 ppm, meeting the stringent sensitivity requirements of UHV substations and HVDC converter stations.
Zero Carrier Gas Consumption
Pure electrical modulation of laser sources eliminates the need for chromatography columns, high-purity carrier gases (H₂/He/Ar), and mechanical choppers. Annual operating costs are approximately 1/10th of conventional online gas chromatography systems.
Maintenance-Free Design
No moving mechanical parts — electrical modulation replaces the optical chopper. All-solid-state laser sources with a rated lifetime exceeding 10 years. Modular architecture with hot-swappable components. MTBF > 50,000 hours.
Product Portfolio
PASL-3000 Online DGA Monitoring System
Full-component laser photoacoustic spectroscopy dissolved gas analysis system for power transformers. Simultaneously measures 9 key fault gases — H₂, CO, CO₂, CH₄, C₂H₆, C₂H₄, C₂H₂, O₂, N₂ — with optional moisture (H₂O) detection. Compliant with IEC 60567, IEC 60599, IEEE C57.104, DL/T 722, and Q/GDW 10536.
View Specifications →LPAS Core Detection Module
Ultra-compact integrated laser photoacoustic spectroscopy gas detection module — only 1/5 the footprint of a conventional GC detection unit. Designed for OEM integration into third-party online monitoring systems, portable DGA analyzers, and laboratory dissolved gas analyzers. Hot-swappable, electrically modulated, zero consumables.
Module Details →Technology Comparison: L-PAS vs. Conventional Methods
Performance data sourced from SPIE OIFM 2024 peer-reviewed study (DOI: 10.1117/12.3034328) and HAOMAI laboratory validation
| Performance Metric | Laser PAS (L-PAS) | Gas Chromatography (GC) | Infrared PAS (IF-PAS) |
|---|---|---|---|
| Light Source Linewidth | 15 fm (single spectral line) | — | ~50 nm (broadband + filter) |
| Cross-Interference | ✅ Zero (single-line locking) | ✅ Column separation | ⚠️ Filter overlap region interference |
| Carrier Gas Required | ✅ None | ❌ High-purity He/Ar needed | ✅ None |
| C₂H₂ Detection Limit | < 0.05 ppm | ~0.1 ppm | ~0.5 ppm |
| Repeatability (RSD) | 0.13% | 0.31% | ~0.5% |
| Moving Mechanical Parts | ✅ None (electrical modulation) | ⚠️ Multi-port valves, column oven | ❌ Mechanical chopper + filter wheel |
| Maintenance Interval | > 1 year | 1–3 months | 6 months |
| Annual Operating Cost | Low | High (carrier gas + columns) | Medium |
Technical Resources
📚 Technical Blog
In-depth articles on DGA principles, photoacoustic spectroscopy, transformer fault diagnosis, and IEC/IEEE standards interpretation
Browse Articles →📄 Document Downloads
International standards, peer-reviewed papers, technical white papers, and product datasheets — one-stop resource center
Download Center →🎥 Video Center
Product demonstrations, technical presentations, installation walkthroughs, and application case studies
Watch Videos →Trusted by the Power Industry
Serving global power utility customers. Products certified to IEC, IEEE, and GB standards.
Substation Installations
Year Laser Lifetime
ppm C₂H₂ Detection Limit
Continuous Online Monitoring
Contact Our Engineering Team
Request a product demonstration, technical consultation, or quotation — our application engineers are ready to assist