Online Residual Chlorine Monitoring: Key Points
Author: Zhejiang Weilan Technology Co., Ltd.Source: Official sitePublished: Category: Technical Articles
Summary: Constant-pressure vs reagent-based chlorine analyzers: differences, sampling requirements and selection tips.
Residual chlorine is the core disinfection KPI; monitoring accuracy directly controls dosing quality.
Two Main Types
- Constant-pressure (membrane): reagent-free, low maintenance, for stable water
- Reagent (DPD): high accuracy, strong interference rejection, for regulatory monitoring
Installation
Sample after complete mixing; keep constant flow and pressure; clean the electrode or cuvette regularly.
Selection
Membrane suits pools and secondary supply; DPD suits plant finished water. See chlorine analyzers.