What size is Smartscan Hydra head & face plate? Egli November 04, 2019 22:08 Updated Follow Dimensions for the Smartscan Hydra face plate: 129 x 124 mm Dimensions for the Smartscan Hydra head: 96 x 86 mm Related articles Where has Automist been installed? What is the fire engineering purpose of Automist? How much does Automist cost? Has Automist Smartscan Hydra been tested against real-life scenarios? What are the obligation of every Accredited Installer? Comments 0 comments Please sign in to leave a comment.