About Shenzhen Feso Automation Technology Co., Ltd

About Shenzhen Feso Automation Technology Co., Ltd

Shenzhen Feso Automation Technology Co., Ltd (brand: PAS DGA) is a specialized manufacturer of flow sensors, gas composition sensors, and dissolved gas analysis (DGA) monitoring equipment for power transformers. Founded in 2015 and headquartered in Bao’an District, Shenzhen, we integrate R&D, manufacturing, and quality control under one roof — delivering sensor solutions that combine precision, reliability, and long service life.

Corporate Structure

Headquarters — Shenzhen, China
Located at Apartment Building, Xusheng B Area, Gongle Community, Xixiang Street, Bao’an District, Shenzhen, our headquarters houses the core engineering team responsible for sensor development, manufacturing, and quality assurance. From this facility, we manage the complete product lifecycle — from MEMS sensor fabrication through final system calibration and testing.

International Sales — Hong Kong (VA Technology Co., Ltd)
Our international marketing and sales operations are based in Hong Kong under VA Technology Co., Ltd, serving as the global commercial hub for the PAS DGA brand. This dual-location structure enables efficient domestic R&D and manufacturing while providing international customers with responsive sales and logistics support.

Core Technology — Hydrogen Sensing

Feso Automation’s defining technical strength lies in palladium alloy thin-film hydrogen sensor technology. Our proprietary solid-state MEMS sensors achieve sub-ppm hydrogen detection with zero consumables and a design life exceeding 10 years — making them among the most durable and maintenance-free H₂ sensors available for transformer dissolved gas analysis.

Technical Advantages

Key Clients — Power Industry

Our hydrogen sensor technology has been adopted by China’s leading power equipment manufacturers and grid operators, including:

• NARI Group (南瑞集团) — China’s largest power automation and grid monitoring enterprise; Feso supplies hydrogen sensor modules for integration into NARI’s transformer monitoring systems.
• TBEA (特变电工) — One of the world’s largest transformer manufacturers; Feso provides OEM hydrogen sensors and multi-gas DGA subsystems for TBEA’s smart transformer packages.
• Shenbian / Shenyang Transformer (沈变) — A flagship subsidiary of TBEA and China’s premier large-power transformer maker; Feso sensors monitor hydrogen levels in extra-high-voltage (EHV) and ultra-high-voltage (UHV) transformers.

Beyond these anchor clients, our sensors and DGA monitors are deployed across provincial grid companies, renewable energy operators, industrial facilities, and railway systems throughout China and in over 50 countries worldwide.

Product Portfolio

Building on our hydrogen sensing core, Feso Automation manufactures a complete range of DGA monitoring solutions:

• Hydrogen Sensors & OEM Probes — DGA-300 OEM module for third-party integration; DGA-200 advanced single-gas monitor with LoRa & IEC 61850; DGA-500 standard hydrogen monitor.
• Multi-Gas DGA Monitors — DGA-900 laser photoacoustic spectroscopy (LPAS) system measuring 9 gases + moisture, with 0.1 ppm C₂H₂ detection limit.
• Flow & Gas Composition Sensors — Precision flow meters and gas composition analyzers for industrial process monitoring and laboratory applications.

Manufacturing & Quality

MEMS Cleanroom Fabrication

Our palladium alloy thin-film hydrogen sensors are fabricated on a dedicated 4-inch MEMS line in Shenzhen. The 6-step manufacturing process — substrate preparation, Ion Beam Deposition (IBD) of the palladium alloy sensing layer, PECVD deposition of the PdOₓ anti-CO poisoning protective layer, photolithographic patterning, wafer dicing, and die packaging — is performed entirely in-house. Each wafer produces approximately 200 sensor die, and every die is individually tested before packaging.

Testing & Burn-In

Every sensor undergoes a 72-hour powered burn-in at 85°C before calibration. During burn-in, we continuously monitor sensor resistance and capacitance (dual-mode detection) to identify and reject infant-mortality failures. Post-burn-in testing includes:

• Thermal cycling: -40 to +85°C, 10 cycles, verify zero-drift <5% of reading
• Response time: T90 verified <60 seconds at 100 ppm H₂ challenge
• Cross-sensitivity: Verify <1% response to CO (1,000 ppm), methane (1%), humidity (0–95% RH)
• Long-term stability: Extended 500-hour test at 85°C for statistical sample from each wafer lot

Certifications

Partnerships

Feso Automation partners with leading transformer monitoring companies, SCADA integrators, and electrical equipment distributors worldwide. Our partnership program offers flexible engagement models — from OEM sensor supply to private-label manufacturing to exclusive regional distribution.

Patnership Tiers

OEM Sensor Supply Program

The DGA-300 OEM hydrogen sensor probe is designed for integration into third-party monitoring systems. OEM partners receive an evaluation kit (2 probes, interface board, MODBUS documentation, 90-day engineering support), technical data package (3D CAD, electrical interface spec, MODBUS register map, EMC test reports, MTBF data), integration support from our application engineering team, volume pricing (50 to 10,000+ units/year), and customization options (cable lengths, connectors, firmware branding, enclosure design) for orders exceeding 500 units.

Private-Label Manufacturing

For partners selling DGA monitors under their own brand: customization of enclosure design, color scheme, company logo, documentation (manuals, quick-start guides, packaging), and firmware splash screen. MOQ: 100 units for standard products, 500 units for custom enclosures.

Company Milestones