An Uninterruptible Power Supply is mandatory on oil rigs: for safety reasons, the signal lighting must be operational at all times. Tasked with designing a UPS solution for an offshore rig off the African coast, R. STAHL was faced with three challenges. The UPS system not only required protective measures against explosive atmospheres, but also had to be adapted to the great heat and maritime climate at the rig's location.

R. STAHL's Yodalex series includes a wide range of signalling devices for hazardous areas, such as the YO6 omni-directional horn, the V6 beacon and the YL6 combination unit. All units feature an IP66 aluminium housing with machined flame paths which provides “ex d” ignition protection (flameproof enclosure).