The DET-C631 is a conventional (non-addressable) optical (photo-electric) smoke detector designed for general fire detection in commercial and industrial environments. It uses an internal infrared emitter/receiver chamber to detect visible smoke particles from smouldering materials like wood, paper, PVC or foam. It operates over a wide voltage range (9.6 – 30 V DC) and offers low standby current, making it suitable for modern fire alarm loops. It carries LPCB certification and complies with the EN54-7 standard. Key Features: Wide operating voltage: 9.6 – 30 V DC, nominal 24 V DC; Very low quiescent current: ≤65 µA standby typical; Alarm current: 18–22 mA (typical ~20 mA); Remote LED output drive: Max 20 mA to drive external indicator; Operating temperature range: –10°C to +50°C; Relative humidity: up to 95% RH (non-condensing) at 40°C; Max air velocity: 7.6 m/s — suitable for some airflow environments; Housing: ABS plastic (UL94 V-0 rated), colour: white; Ingress protection: IP42 standard (indoor use); LPCB approved, complies with EN54-7 optical smoke detection standard. Industrial Uses / Applications: Office buildings and commercial premises; Retail stores, shopping malls; Schools, clinics, educational institutions; Warehouses and storage facilities; Areas where visible smoke detection is preferred (e.g., smouldering fire risk).