Choosing the right online DGA monitor involves more than comparing datasheets. This guide walks through the key factors international buyers should consider — from sensor technology and total cost of ownership to supplier evaluation.
1. Gas Coverage: Single-Gas vs. Multi-Gas
Hydrogen-only monitoring catches 90%+ of developing faults at the lowest cost per unit — ideal for fleet-wide deployment on standard transformers. Multi-gas monitoring provides comprehensive diagnostics — essential for critical transformers (>100 MVA, GSU, transmission) and for investigating transformers with known issues.
2. Total Cost of Ownership (10-Year View)
The purchase price is only ~30% of the 10-year cost. Consider: consumables (carrier gas, columns — can exceed the purchase price over 10 years), maintenance visits (cost per site visit), sensor replacement (field job or factory return?), and integration engineering hours. Solid-state thin-film sensors typically deliver 40-60% lower 10-year TCO versus GC-based online monitors.
3. Communication & Integration
MODBUS RTU/TCP — universal standard, works with virtually all SCADA/DCS. 4-20 mA analog — simple and reliable for basic alarm integration. IEC 61850 — required for modern digital substations with station bus architecture. LoRa/cellular wireless — essential for remote sites without communication infrastructure.
4. Supplier Evaluation for International Buyers
Key factors: English-language documentation and technical support, international shipping experience and logistics capability, warranty terms and warranty service process for your region, minimum order quantities and typical lead times, availability of local distributor partners or service support in your country.
5. The PAS DGA Advantage
Direct-from-manufacturer pricing with full factory support. 5-year warranty. Zero consumables — lowest 10-year TCO. English documentation and support. Flexible order quantities. Established global logistics to 50+ countries.