Product Introduction

The ESN1000 Online Disinfectant Analyzer operates on the principle of electrochemistry, measuring disinfectant concentration through potentiostatic methods. It offers high precision, rapid response, and easy maintenance, making it widely applicable in water treatment, drinking water monitoring, swimming pool management, and other fields.

Instrument Features
  • Fast response time for quick and accurate monitoring of water sample changes;
  • No reagents required, eliminating secondary pollution;
  • Three-electrode potentiostatic principle, simple to use and easy to maintain;
  • Capable of measuring residual chlorine, chlorine dioxide, and ozone, with direct menu switching;
  • Supports dosing control for intelligent chemical addition.
Typical Applications


Online monitoring for disinfection processes in tap water, swimming pools, industrial process water, and membrane treatment processes such as reverse osmosis.

Online ozone monitoring in wastewater and purified water industries


Water Treatment Plant
Swimming Pool
Wastewater Treatment
Industrial Processes


Technical Specifications
Display 7-inch screen (resolution 1024*600) Power Supply & Consumption 220VAC <10W; 24VDC<300mA
Signal Output RS485*1; 4-20mA output*1 Relay 1 channel
Construction Material & Protection Class ABS; IP65  Dimensions & Weight 230*180*100 (L*W*D); 2kg
Operating Temperature 0-45°C, water sample temperature 0-50°C Measurement Method Residual Chlorine/Chlorine Dioxide/Ozone: Three-electrode potentiostatic method
Range/Resolution Residual Chlorine/Chlorine Dioxide/Ozone: 0-20mg/L; 0.001mg/L Comparison Error (Measurement Accuracy) Residual Chlorine/Chlorine Dioxide/Ozone: ±0.02mg/L (when actual water sample ≤0.1mg/L); <10% or ±0.05mg/L, whichever is greater (when actual water sample >0.1mg/L).
Repeatability Residual Chlorine/Chlorine Dioxide/Ozone: ±5% Lower Detection Limit Residual Chlorine/Chlorine Dioxide/Ozone: 0.02mg/L