VT-DGA800 8-Gas Online DGA Monitor
VT-DGA800 8-gas online DGA monitor with moisture sensor and PAS technology for critical transformer monitoring. IEC 61850, Modbus, DNP3.
VT-DGA800 8-Gas Online DGA Monitor with Moisture
Flagship online DGA monitor for critical transmission and generation transformers.
Overview
The VT-DGA800 is VA-TEK’s most comprehensive online dissolved gas analyzer. Using photoacoustic spectroscopy (PAS) technology, it measures 8 dissolved gases plus moisture continuously every 2 hours, providing 24/7 surveillance of the most critical transformers in your fleet. With integrated web dashboard, multiple communication protocols, and IEC 61850 support, the VT-DGA800 delivers laboratory-comparable DGA data in real time.
Key Features
- 8 gases + moisture: H2, CO, CO2, CH4, C2H2, C2H4, C2H6, O2 + oil moisture (%RS)
- PAS technology: No carrier gas, no consumables, minimal maintenance
- Automatic oil circulation: Integrated oil pump with membrane extraction system
- Built-in web server: Dashboard accessible from any browser — no client software required
- Multi-protocol communication: IEC 61850, Modbus TCP/RTU, DNP3, 4-20 mA
- Automated alarms: User-configurable thresholds for gas levels and gassing rates
- Built-in diagnostics: Duval Triangle, Rogers Ratio, Key Gas method integrated
- Data logging: 10-year onboard storage of all measurements
Technical Specifications
| Parameter | Specification |
|---|---|
| Measured Gases | |
| Gases | H2, CO, CO2, CH4, C2H2, C2H4, C2H6, O2 |
| Moisture | Oil relative saturation (%RS), 0-100% |
| Measurement technology | Photoacoustic spectroscopy (PAS) |
| Measurement interval | Configurable, 2-24 hours (default 2 hours) |
| Sample volume | < 5 mL oil per measurement cycle |
| Accuracy | |
| Hydrocarbons (CH4, C2H2, C2H4, C2H6) | +/- 10% or 1 ppm (whichever greater) |
| H2, CO | +/- 10% or 5 ppm (whichever greater) |
| CO2 | +/- 15% or 25 ppm (whichever greater) |
| O2 | +/- 15% or 100 ppm (whichever greater) |
| Moisture (%RS) | +/- 3% |
| Repeatability | < 2% of reading |
| Oil System | |
| Oil connections | 2 x 1/2″ NPT (inlet/outlet), isolation valves included |
| Oil pump | Integrated, brushless, maintenance-free |
| Operating oil pressure | 0-50 kPa (0-7 psi) at monitor inlet |
| Operating oil temperature | -10 C to +90 C |
| Communication | |
| Protocols | IEC 61850, Modbus TCP, Modbus RTU, DNP3, 4-20 mA (x4) |
| Interfaces | Ethernet RJ45 (x2), RS-485, fiber optic (optional) |
| Web interface | Built-in, HTML5, SSL/TLS, user authentication |
| Physical | |
| Dimensions | 450 x 350 x 250 mm (H x W x D) |
| Weight | 18 kg |
| Enclosure rating | IP65, stainless steel |
| Operating temperature | -40 C to +65 C (ambient) |
| Power Supply | |
| Input voltage | 100-240 V AC, 50/60 Hz; or 24-48 V DC |
| Power consumption | < 50 W (typical), < 100 W (peak with oil pump) |
| Certifications | |
| CE, IEC 61010-1, IEC 61326-1, IP65, RoHS, REACH |