Chemtrol® PC7100 Programmable Controller with Dual Chlorine Sensors, 110/230V. The Chemtrol® PC7100 Programmable Controller is a user-friendly controller that introduces a new standard of sophistication in automated control of sanitizers (chlorine or bromine), oxidizers and pH. All menus are displayed in clear language in english, french or spanish with choice of US or metric units. Each controller comes with an operation manual, on-site startup and training by a qualified dealer and the security of a 5-year electronics warranty.