Digital Controllers Selection Chart

Models and features

CHEMTROL Selection Features	CH230	CH240	CH250	CH255	CH265
pH Control		✓	✓	✓	✓
ORP Control	✓		✓
Sanitizer, Free Chlorine control (PPM)				✓	✓
4-20 mA Outputs	Option	Option	Option	Option	✓
Feed Mode: Manual, Automatic, Proportional	✓	✓	✓	✓	✓
Alarms: Audio, Visual, External	✓	✓	✓	✓	✓
Alarms: Out-of-Range, Runtime and Overfeed	✓	✓	✓	✓	✓