Chemtrol® PC5000 Programmable Controller with PPM Sensor, 110/230V Fiberglass Cabinet. Chemtrol® PC5000 Controller is a programmable control system that offers complete chemical automation including ORP, PPM, and pH, plus control of conductivity or TDS, water balance with Langelier Index, temperature and heater control. The PC5000 features a unique solid-state PPM SENSOR that generates easy-to-use, direct and reliable readings of free chlorine concentration in water. Unlike conventional amperometric sensors, this sensor is simple to install and highly reliable. It includes a special flow cell and is not affected by oxidizers and orcyanuric stabilizers. The combination of PPM and ORP (Oxidation-Reduction Potential) sensors gives the operator the capability to control either chlorine residual or oxidizing activity. The user-friendly main screen display enables the operator to supervise all the process functions at a glance and to quickly respond to any changing condition. The controller operates like a computer with full-screen displays and direct access to all menus and submenus. The front panel keypad is used to move up and down each menu and enter or exit the submenus. All operating functions can be easily modified from the keypad, including sensor calibration, control set-points, alarm levels and the programs for superchlorination, sequential backwashing, chemical saving and energy saving.