Wall-mounted single-channel receiver with a large 3.0-inch, 3-digit gas concentration display. Provides three-stage alarms, trouble indication, relay contact outputs and self-diagnostics, with warning-light compatibility. Accepts 4–20 mA detector inputs and provides 4–20 mA output, with optional isolated RS-485 Modbus communication. Alarm levels, delays and relay settings are programmable. Dimensions: 280 × 389 × 153 mm; weight: 2 kg.