An explosion-proof photoelectric smoke detector with a 4-port aluminum junction box, 3/4" NPT entries and latching 0–20 mA plus relay outputs, FM/IECEx/CSA approved for Class I, Division 1 and Zone 1 hazardous locations. The U5015 (marketed as ClearView 3D, formerly SmokeWatch) provides smoke detection inside classified areas: petroleum refineries, chemical processing plants, volatile chemical and combustible storage, munitions manufacturing, turbine enclosures, battery rooms and HVAC applications. It responds to both smouldering and rapidly growing fires and annunciates its own faults, so there are no undisclosed failures. The intrinsically safe sensor module is hot-swappable, allowing live maintenance under power without de-classifying the hazardous area. The 4-port junction box simplifies wiring where conduit must be run through the device or where multiple detectors are daisy-chained. Three relays — smoke alarm, fault and auxiliary — drive annunciating devices or interface to a fire panel, while the 0–20 mA output supports DCS or PLC integration.