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German-made CL4.2 Free Chlorine Sensor with Fast Response Time for Drinking Water
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German-made CL4.2 Free Chlorine Sensor with Fast Response Time for Drinking Water

German-made CL4.2 free chlorine sensor adopts a membrane-covered amperometric 2-electrode system with built-in electronics, which only measures pH-dependent residual chlorine, integrates a temperature sensor for automatic temperature compensation avoiding sudden temperature change), requires no zero-point adjustment but needs DPD-1 method calibration, and is affected by pH and O3; in terms of technical features, it has high measurement stability, easy operation and maintenance, good environmental adaptability, and flexible signal & connection; This residual chlorine sensor is mainly applied to water bodies without surfactants to avoid membrane contamination, such as swimming pool water, drinking water, service water, and process water, and must be used with a dedicated flow cell to meet flow and pressure requirements.
Model CL4.2
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Detail
Special features
• short response time
• easy handling
Applications
swimming-pool, drinking, service and process water
Ambient conditions
• stable pH value
• no surfactants in the measuring water
• max. temperature: 45 °C
• max. pressure: 1 bar
Technical Specifications

Measurement ParametersFree chlorine, pH dependent
Measuring Ranges/Resolution0.005…0.500ppm: 0.001ppm; 0.005…2.000ppm: 0.001ppm; 0.05…20.00ppm:0.01ppm; 0.005…5.000ppm: 0.001ppm; 0.5…200.0ppm: 0.1ppm; 0.05…5.00ppm: 0.01ppm; 0.05…10.00ppm:0.01ppm; 0.5…100.0: 0.1ppm
Response timeT90≈30 seconds
Measuring water temperature0... + 45 °C (no ice crystals in the measuring water)
Ambient temperature0... + 55 °C
Temperature compensationAutomatically, by an integrated temperature sensor
Sudden temperature changes must be avoided
Max. allowed working pressureOperation with retaining ring in FLC: - 0.5 bar - no pressure impulses and/or vibrations
Operation with retaining ringin FLC: - 1 bar
- no pressure surges and/or vibrations
Flow rate(face velocity)approx. 15-30/h (33 – 66 cm/s) in Flow cell, small flow rate dependence is given
pH - rangepH 6 – pH 8, 8, pay attention to the dissociation equilibrium HOCL
Run - in timeFirst start-up approx. 1 h
Zero point adjustmentNot necessary
Protection class5-pole M12 plug-on flange: IP68
2-pole terminal with mA-hood: IP65
MaterialSemipermeable membrane, PVC-U, ABS

FAQ – Frequently Asked Questions


1. Where are your products manufactured?

Our products are proudly designed and manufactured in China, following international quality standards and certified processes.


2. Can you provide OEM/ODM services for international clients?

Yes, we offer customized solutions and private labeling to meet your brand’s needs worldwide.


3. Are your products compliant with international safety and quality standards?

Absolutely. Our products are tested to meet CE, RoHS, and other international certifications.


4. How do you handle shipping and delivery for overseas orders?

We cooperate with major international couriers to ensure fast and reliable delivery to your location.


5. Can I get product samples before placing a large order?

Yes, we provide samples so you can evaluate product quality before committing to bulk orders.


6. What is the typical lead time for production and delivery?

For standard products, we usually ship within 5–7 days after order confirmation. Customized products may take slightly longer.


7. How do you support clients after the purchase?

We offer 24/7 technical support, product guidance, and warranty service to ensure smooth operation.


8. Do you provide support for international clients after purchase?

Yes, we offer remote technical assistance, manuals in English, and prompt solutions to any issues, ensuring smooth use worldwide.


9. How can I place an order if I am located overseas?

You can contact our sales team directly via email or website inquiry. We provide professional guidance throughout the ordering process.


10. Why should I choose your company over other suppliers in China?

We combine over 30 years of manufacturing experience, advanced technology, strict quality control,

and global customer service to deliver reliable, high-quality solutions.


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