Product Introduction

The ESN2000 Online Disinfectant Analyzer operates based on electrochemical principles, measuring disinfectant concentration through potentiostatic method. With advantages including high precision, rapid response, and easy maintenance, it is widely used in water treatment, drinking water monitoring, pool management and other fields.

Instrument Features
  • Modular design for easy maintenance;
  • Fast response time enables quick and accurate monitoring of water sample changes;
  • No reagents required, eliminating secondary pollution;
  • Uses three-electrode potentiostatic method, only reference electrode needs replacement, reducing consumable costs;
  • Measures residual chlorine/dioxide chlorine/ozone with direct menu switching;
  • Pressurized flow path prevents electrode scaling;
  • Built-in flow compensation ensures accurate measurement unaffected by flow rate or pressure;
  • Integrated water deficiency detection system provides real-time operation status feedback, improving monitoring data reliability;
  • Supports chemical dosing feedback control for intelligent dosing.
Typical Applications


Online monitoring of tap water, swimming pools, industrial process water disinfection, and membrane treatment processes like reverse osmosis.

Online ozone monitoring in wastewater and purified water industries.


Tap Water Plant
Tap Water Plant
Swimming Pool
Swimming Pool
Industrial Process
Industrial Process
Wastewater Treatment
Wastewater Treatment


Technical Specifications
Display 7-inch screen (1024*600 resolution) Power Supply & Consumption 220VAC <10W; 24VDC<300mA
Signal Output RS485*1; 4～20mA output*3 (optional) Relay 1 channel, 5 channels (optional)
Material & Protection ABS; IP65  Dimensions & Weight 500*280*108mm(L*W*D); 5kg
Operating Temperature 0~45°C, sample temperature 0~50°C Measurement Method Temperature: Thermistor method; Residual chlorine/chlorine dioxide/ozone: Three-electrode potentiostatic method; pH: Glass electrode method
Range/Resolution Temperature: 0~100°C;0.01°C Comparison Error (Measurement Accuracy) Temperature: ±0.3°C
Residual chlorine/chlorine dioxide/ozone: 0~20mg/L; 0.001mg/L Residual chlorine/chlorine dioxide/ozone: ±0.02mg/L (when actual sample ≤0.1mg/L); < 10% or ±0.05mg/L, whichever is greater (when actual sample >0.1mg/L).
pH: 0~14pH;0.01pH pH: ±0.1pH
Repeatability Temperature: ±0.2°C Detection Limit Residual chlorine/chlorine dioxide/ozone: 0.02mg/L
Residual chlorine/chlorine dioxide/ozone: ±5% pH: 0.05pH
pH: ±0.1pH *******