Wall-mounted single-channel receiver with a large 1.8-inch, 4-digit concentration display. Provides three-stage alarms, trouble indication, relay outputs and self-diagnostics, and supports warning lights. Accepts 4–20 mA detector inputs and provides 4–20 mA output, with optional isolated RS-485 Modbus communication. Alarm levels, delay time and relay settings are programmable. Dimensions: 235.6 × 355.5 × 117.3 mm; weight: 1.4 kg.