You need to have the Hayward Sense and Dispense system connected...
Sense & Dispense monitors residential pools to maintain balanced water, without the hassle. A continuous sensing module for pH and sanitization (ORP) levels with the ability to dispense chlorine when paired with a chlorination system.
www.hayward-pool.com
ORP systems that try and measure chlorine levels have limitations and don’t work well with high CYA levels. It is not a set and forget system.