What size is Smartscan Hydra head & face plate? Egli November 04, 2019 22:08 Updated Dimensions for the Smartscan Hydra face plate: 129 x 124 mm Dimensions for the Smartscan Hydra head: 96 x 86 mm Related articles What the specification of the filter for Automist? How much does Automist cost? Where has Automist been installed? Will it turn off if my electric meter stops? What if I have a prepay meter? Why are the nozzles wall mounted instead of on the ceiling? Comments 0 comments Please sign in to leave a comment.