The eSelect B4 controller measures the main parameters in water treatment applications. It is possible to connect the new controller to an Ethernet LAN to control all parameters and store all data. We have used a 7” colored display touch screen to improve the view, with user-friendly settings and displays. The main technical characteristics of the B4 are the following: • 3 measure channels (4 on request), settable separately by the user: pH, RX, Cl2, Cl tot • Temperature measure • Automatic filter washing output • No. 2 auxiliary outputs activating by a weekly/daily timer • No.1 input water meter • No.1 Ethernet RJ45 (LAN) connection • No.1 USB to update firmware or to download data • Power supply 100-250 VAC or 12-30 VDC