Wall-mounted single-channel receiver with a 4-digit concentration display and a 32-segment, three-colour bar graph. Three-stage alarms, trouble indication, relay outputs and self-diagnostics support gas monitoring. Accepts 4–20 mA detector inputs and provides 4–20 mA output, with optional isolated RS-485 Modbus communication. Alarm levels and delays are programmable. Dimensions: 135 × 210 × 81 mm; weight: 508 g.