Intelligent diffusion detector for oxygen and toxic gases with an explosion-proof enclosure and built-in display. Features relay contact outputs, self-diagnostics and non-intrusive calibration and settings using a magnetic bar. Provides 4–20 mA output with optional RS-485 Modbus communication. Supports the GTL-100 explosion-proof warning light. Aluminium-alloy and stainless-steel housings are available; operating temperature: −20°C to 60°C.