transport, signaling devices are often exposed to extreme conditions," explains Carsten Hippler, Sales Product Manager Signaling at Pfannenberg. "We are proud that our DNV-GL-certified signaling devices are [...] Hamburg, 21 August 2017. DNV-GL-certified signaling devices from the electro-technology specialists Pfannenberg are the right solutions for tough industrial applications where they will be exposed [...] and reliability. For example, the sound from the audible signaling devices can carry over the high ambient noise levels generated by production processes and also penetrate acoustic obstacles effectively