The DA-790 is a digital-process gas detector designed for industrial gas analysis applications. It measures multiple gas components including NOx, SO₂, CO₂, CO, O₂, and H₂ using sampling-based gas analysis with NDIR, NDUV, TCD, and optical detection methods. The system is configurable depending on the selected gas combination and supports modular configuration with optional gas probe and moisture cooler. It operates using AC 220V input power and provides standard 4–20 mA output along with RS-485 communication and relay outputs. Each gas channel has specific detection ranges depending on the selected configuration (e.g., NOx: 0–400 ppm, SO₂: 0–300 ppm, O₂: 0–25% VOL, H₂: 0–4% VOL, CO₂: 0–100% VOL, CO: 0–50% VOL).
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