Intelligent Inline Free Chlorine Analyzer with CL2.2 Sensor for Sea Water

Published on by for Dabeco

Intelligent Inline Free Chlorine Analyzer with CL2.2 Sensor for Sea Water

The Inline Residual Chlorine Analyzer is equipped with German-made CL2.2 sensor, which uses a coated amperometric dual-electrode system to detect only hypochlorous acid (HOCL) in water, with automatic temperature compensation, analog/digital signal output, no zero calibration, and slope loss affected by pH; It applies to high-salt water for disinfection monitoring of drinking water, swimming pool water, slightly polluted process/cooling water, and features high-salt resistance, stable dual-electrode measurement with fast response, easy operation, and environmental demands.

Working Principle

W761-DCL2.2 mainly consists of two parts: the control panel and the Germany-made CL2.2 free chlorine sensor. The controller displays the disinfectant value (main measured value), the pH value of the aqueous solution (a pH electrode is required for selection), and the working status. It outputs signals such as analog, digital, and switching signals.

The free chlorine sensor Adopts a  coated amperometric dual-electrode measurement system , with the core principles as follows:

1.  Detection Target : Only detects  hypochlorous acid (HOCL)  in water; cannot detect hypochlorite (anionic form); only applicable to inorganic chlorinating agents (chlorine gas, sodium hypochlorite, calcium hypochlorite, chlorine generated by membrane electrolysis); cannot detect organic chlorinating agents (e.g., cyanuric acid-based products).

2.  Signal Processing : Integrates a temperature sensor to achieve  automatic temperature compensation , and outputs compensated signals—analog signals (4~20 mA or 0~±2V) and digital signals (Modbus RTU, via RS485 interface).

3.  Calibration Requirements : Zero-point calibration is not required; slope calibration must be performed using the  DPD-1 method (colorimetric method, DPD testing equipment needs to be purchased separately) ; after calibration, the pH value must remain stable (fluctuation < 0.05); otherwise, a sensor with lower pH dependence should be selected.

4.  pH Impact : The concentration ratio of hypochlorous acid (HOCL) depends on the pH value; pH changes will cause measurement slope loss (e.g., approximately 60% slope loss at pH=8, and approximately 80% at pH=8.5, with pH=7 as the reference).

Application

Core adaptation to  high-salt concentration water bodies , with specific scenarios as follows:

1.  Basic Environment : Brine or seawater with a  salt concentration of 3.5%~26% (conductivity > 50mS) .

2.  Specific Applications :

◦ Disinfection monitoring of drinking water and swimming pool water;

◦ Disinfection monitoring of slightly polluted process water and cooling water treatment;

◦ Must be used with a dedicated flow cell to ensure the water flow meets requirements.

Product Features

1.  High-Salt Adaptability : Specifically designed for brine/seawater with a salt concentration of 3.5%~26%, and resistant to high-salt environments.

2.  Advantages of Measurement System : Dual-electrode structure improves measurement stability; fast response time (T90 ≈ 30 seconds).

3.  Easy Operation : Integrates temperature compensation, no zero-point calibration required; can be directly connected to a dedicated transmitter, supporting "one-click calibration".

4.  Environmental Requirements :

◦ Water flow must be controlled at  15~30 L/H (in the flow cell) ;

◦ The water to be measured must be drinking water or clean water, free of solids and surfactants (e.g., detergent components);

◦ Only one type of disinfectant can be used at a time to avoid interference.

1.  Slope Characteristics : The sensor slope fluctuates depending on the manufacturer/application (65%~150% of the nominal slope); it is recommended to determine the suitable measurement range by multiplying the concentration to be measured by 1.5 (e.g., if the concentration to be measured is 1.6ppm → a measurement range of 5ppm is recommended).

 

Technical Parameters

Category

Detailed Parameters

Basic Parameters

Measuring Parameter: Free chlorine; Applicable Chlorinating Agents: Inorganic chlorine compounds (NaOCl, Ca(OCl)₂, chlorine gas, membrane electrolytic chlorine); Diaphragm-free electrolytic chlorine is prohibited

Measurement Performance

Measurement Range:

0.005~2 mg/L (ppm, resolution 0.001 mg/L);

0.05~20 mg/L (ppm, resolution 0.01 mg/L);

Response Time T90: Approximately 30 seconds

Environmental Conditions

Water Temperature: 0~45℃ (no condensation);

Ambient Temperature: 0~55℃;

pH Operating Range: 6~8;

Flow Rate: 15~30 L/H (in flow cell)

pH Dependence

Approximately 60% slope loss at pH=8, and approximately 80% at pH=8.5 (with pH=7 as the reference);

pH fluctuation must be maintained < 0.05

Signal & Power Supply

Output Signal: 4~20mA/0~±2V (analog), Modbus RTU (digital);

Power Supply Voltage: 12~30VDC (2-pin terminal), 9~30VDC (5-pin M12)

Connection Method

2-pin terminal (2×1mm²), 5-pin M12 aviation connector

Interfering Factors

Chlorine Dioxide (ClO₂): Measured, concentration coefficient 9; Ozone (O₃): Measured; Diaphragm-free chlorine electrolysis causes interference

Physical Characteristics

Pressure Resistance: Maximum absolute pressure 2 bar, maximum relative pressure 1 bar; Materials: Semipermeable membrane, PVC-U, ABS; Dimensions: Diameter 25mm, length 190~220mm (depending on connection method); Weight: Approximately 125g

Others

Polarization Time: 1 hour; Electromagnetic Compatibility (EMC): Interference emission Class B, immunity meets industrial requirements (EN 61326-1/2-3)

Information

Media

Taxonomy