Precision Dissolved Gas Analysis for the World's Transformers
From single-gas hydrogen sensors to comprehensive 9-gas Laser Photoacoustic Spectroscopy (LPAS) — PAS DGA offers the industry's most complete range of online transformer monitoring solutions. Zero consumables, lab-grade accuracy, deployed in 50+ countries.
Two Product Families. One Technology Platform.
From hydrogen-only sensors for fleet-wide deployment to comprehensive 9-gas LPAS systems for critical assets — all built on proprietary palladium alloy thin-film technology. Engineered in Shenzhen, deployed worldwide.
Hydrogen Sensors
Pd Alloy Thin-Film — DGA-200 / 300 / 500 Series
The industry's most complete range of solid-state hydrogen sensors. From the 1–2 ppm OEM probe (DGA-300) to the field-proven workhorse (DGA-500) to the advanced multi-gas monitor with LoRa and IEC 61850 (DGA-200). All share the same zero-maintenance Pd alloy thin-film core with 10+ year service life.
- 1–2 ppm Detection
- 5–5,000 ppm Range
- MODBUS + IEC 61850 + LoRa
- IP65/66/67 Rated
- 10+ Year Sensor Life
- Zero Consumables
DGA-900
Laser Photoacoustic Spectroscopy — Full 9-Gas + Moisture
Laboratory-grade comprehensive DGA in real time. 9 fault gases plus moisture via patented Laser Photoacoustic Spectroscopy (LPAS). 0.1 ppm C2H2 detection. Deployed at China's 1000 kV UHV substations and ±800 kV HVDC converter stations. Three configuration modes: Module Only, Standard System, Premium System.
- 9 Gases + Moisture
- 0.1 ppm C2H2
- IEC 61850 + MODBUS + DNP3.0
- Duval / Rogers / Doernenburg
- 72-Hour Early Warning
- 3-Year Warranty
PAS DGA Technology — Two Core Innovations
Every PAS DGA monitor is powered by two proprietary technologies developed and manufactured in-house. Together they deliver lab-grade accuracy with zero consumables and 10+ year sensor life.
Photoacoustic Spectroscopy (PAS)
Photoacoustic spectroscopy detects dissolved gases by their characteristic infrared absorption spectra. A modulated light source excites gas molecules, generating acoustic waves proportional to concentration — no carrier gas, no columns, no flame ionization detector. Our Laser PAS (LPAS) variant in the DGA-900 achieves a 15-femtometer spectral line width for virtually zero cross-interference between gas species.
Used in: DGA-200 (IR-PAS module) and DGA-900 (LPAS, 9 gases)
Palladium Alloy Thin-Film H2 Sensing
Our proprietary MEMS-fabricated palladium alloy sensor detects dissolved hydrogen by direct oil immersion — no membrane, no oil-gas separation. The Pd lattice absorbs H2 selectively with zero cross-response to CO or hydrocarbons. A patented PdOx anti-CO diffusion barrier ensures 10+ year stability. The DGA-300 variant adds MIS C-V dual-mode sensing for 1–2 ppm detection — 5× better than standard thin-film.
Used in: DGA-200, DGA-300, DGA-500 — all hydrogen sensor models
DGA Knowledge Base
DGA Fundamentals
The 7 key fault gases — sources, generation mechanisms, and what each gas reveals about transformer condition.
Start Learning →Diagnostic Methods
Duval Triangle, Rogers Ratio, IEC 60599, Key Gas Method — complete reference with interpretation examples.
Read →Fault Types & Gas Signatures
Thermal faults, partial discharge, arcing — complete diagnostic reference with characteristic gas ratio patterns.
Read →Duval Triangle Guide
Step-by-step guide to the most widely used DGA interpretation method — Duval Triangles 1 through 5 explained.
Read →Why International Buyers Choose PAS DGA
ISO 9001 certified manufacturing. MEMS-grade cleanroom fabrication. Direct from manufacturer.
Industries & Applications
From 1,000 kV UHV substations to remote wind farms — PAS DGA serves every power transformer application. Hydrogen sensors for fleet-wide deployment. DGA-900 LPAS for the most critical assets.
Power Utilities
Transmission & distribution. 110 kV to 1,000 kV UHV. Fleet-wide condition-based maintenance.
Learn more →Heavy Industry
Steel, chemicals, mining. Critical process transformers where downtime costs millions per day.
Learn more →Renewable Energy
Wind, solar, BESS. Remote assets, variable loads. LoRa wireless DGA purpose-built.
Learn more →HVDC & UHV
Converter transformers. Autotransformers. DGA-900 LPAS for the most demanding applications on the planet.
Learn more →ISO 9001 Certified · IEC 60599 & IEEE C57.104 Compliant · 5-Year Warranty · Global Shipping
Request Pricing & Availability →Trusted Worldwide
Real-world PAS DGA deployments delivering measurable results.
DGA-500 detected a rapid hydrogen increase from 8 to 85 ppm in 48 hours. Inspection revealed tracking damage that would have caused catastrophic failure within weeks.
Steel Mill, Southeast Asia
Arc Furnace Transformer · 120 MVA · $2.3M Saved
DGA-200 with LoRa wireless provided 3+ years of continuous monitoring with zero maintenance visits — reducing vessel mobilization costs by 60%.
Offshore Wind Farm, Northern Europe
5 MVA Step-Up · 12km Offshore
DGA-300 dual-mode sensing provided the measurement redundancy required by nuclear safety documentation. Zero sensor drift over 4+ years.
Nuclear Power Plant, Middle East
Safety-Related Auxiliary Transformers