What size is Hydra/Smartscan face plate & body Egli April 04, 2019 14:51 Updated Follow Related articles Where has Automist been installed? How much does Automist cost? What is the fire engineering purpose of Automist? Has Automist Smartscan Hydra been tested against real-life scenarios? Should the alarms / detectors be covered whilst building and other works are being carried out? Comments 0 comments Please sign in to leave a comment.