NS-CL128 Digital Residual Chlorine Sensor

Position: Home > > Sensors and Transmitters > Other sensor > NS-CL128 Digital Residual Chlorine Sensor

NS-CL128 Digital Residual Chlorine Sensor

Product ID：CHGOTHER042

Price: Please inquire PDF Format

Supply Ability:50 SETS/MON

Port:SHENZHEN

Product Introduction
Other information

Model NumberNS-CL128

Brand NameSHANGHAINUOBO

Payment TermsT/T, paypal，Alibaba.com Pay

NS-CL128 Digital Residual Chlorine Sensor

Product Introduction
The NS-CL128 Digital Residual Chlorine Sensor is an intelligent water quality monitoring sensor designed for continuous measurement of residual chlorine in aqueous solutions. It uses an advanced membrane-free constant-voltage sensing technology, eliminating the need for membrane and reagent replacement while simplifying routine maintenance.
With RS485 and optional 4–20mA outputs, the sensor can connect directly to computers, PLCs, and industrial control systems without a separate meter. Users can also monitor data, configure parameters, calibrate, and perform maintenance through a mobile app or computer.
The NS-CL128 is suitable for water treatment, swimming pool chlorination, circulating water dosing, and other applications requiring continuous residual chlorine monitoring.

Performance Features
• Membrane-free design: Constant-voltage sensing technology requires no membrane or reagent replacement.
• Stable measurement: High sensitivity, fast response, accuracy, repeatability, and strong resistance to interference.
• Digital and analog outputs: Supports RS485 and optional 4–20mA signal output.
• Direct system integration: Connects to compatible computers, PLCs, and industrial control equipment without an external meter.
• Mobile app support: Enables data collection, configuration, and maintenance through wired OTG/RS485-to-USB connections or supported wireless networks.
• Flexible configuration: RS485 communication supports address and baud rate settings, online calibration, factory reset, output range adjustment, proportional coefficient, and incremental compensation.
• Replaceable probe: The probe can be replaced when required.
•Two-point calibration: Supports two-point correction for measurement calibration.

Working Principle
The NS-CL128 uses a membrane-free constant-voltage sensor to measure residual chlorine in water. The sensing element produces an electrical response related to the chlorine concentration. The sensor processes this signal and converts it into a residual chlorine measurement.
The measured data can be transmitted through RS485 or, when equipped, a 4–20mA output. Two-point calibration helps adjust the sensor response for measurement accuracy.

Technical Specifications

Parameter	Specification
Product Model	NS-CL128
Measurement Parameter	Residual chlorine
Measurement Range	0–20.00 mg/L (ppm)
Accuracy	±1% FS
Communication Interface	RS485, partially compatible with MODBUS
Analog Output	4–20mA (optional)
4–20mA Load	<750Ω
Operating Temperature	0–60°C
Input Impedance	≥1 × 10¹²Ω
Operating Voltage	DC 12V / 24V
Calibration	Two-point calibration
Probe	Replaceable
Protection Rating	IP68

Application Scenarios
• Drinking water treatment plants: Continuous residual chlorine monitoring during water treatment.
• Drinking water distribution networks: Monitoring residual chlorine in distributed water.
• Swimming pools: Residual chlorine monitoring for chlorination control.
• Circulating water systems: Supporting automatic chemical dosing and process control.
• Hospital wastewater treatment: Monitoring residual chlorine in wastewater treatment processes.
• Water treatment engineering: Integration into online water quality monitoring and control systems.

Comparison: NS-CL128 vs. Conventional Residual Chlorine Monitoring

Feature	NS-CL128 Digital Sensor	Conventional Monitoring Systems
Sensing Technology	Membrane-free constant-voltage sensor	Depends on the selected system
Membrane Replacement	Not required	May be required
Reagent Replacement	Not required	May be required
Signal Output	RS485 and optional 4–20mA	Depends on the system
External Meter	Not required for compatible direct connections	May require a dedicated meter
Remote Access	Mobile app and computer support	Depends on system configuration
Calibration	Two-point calibration	Depends on instrument
Maintenance	Simplified routine maintenance	Depends on sensor design

FAQ
1. What does the NS-CL128 measure?
It measures residual chlorine in aqueous solutions over a range of 0–20.00 mg/L (ppm).
2. Does the sensor require membrane or reagent replacement?
No. Its membrane-free constant-voltage design eliminates routine membrane and reagent replacement.
3. What signal outputs does the NS-CL128 support?
It supports RS485 communication and optional 4–20mA analog output.
4. Can the sensor connect directly to a PLC or computer?
Yes. It can connect directly to compatible equipment with RS485 or 4–20mA interfaces without a separate meter.
5. Can I configure the sensor using a mobile phone?
Yes. A mobile app can be used for data collection, configuration, and maintenance through a supported wired connection or wireless network.
6. What settings can be adjusted through RS485?
Configurable parameters include the slave address, baud rate, calibration, factory reset, 4–20mA output range, proportional coefficient, and incremental compensation.
7. Is the probe replaceable?
Yes. The NS-CL128 features a replaceable probe.
8. What is the operating temperature range?
The specified ambient operating temperature is 0–60°C.
9. Is the sensor suitable for continuous water monitoring?
Yes. It is designed for continuous residual chlorine monitoring in water treatment and other applicable water quality control systems.

FAQ
1. What does the NS-CL128 measure?
It measures residual chlorine in aqueous solutions over a range of 0–20.00 mg/L (ppm).
2. Does the sensor require membrane or reagent replacement?
No. Its membrane-free constant-voltage design eliminates routine membrane and reagent replacement.
3. What signal outputs does the NS-CL128 support?
It supports RS485 communication and optional 4–20mA analog output.
4. Can the sensor connect directly to a PLC or computer?
Yes. It can connect directly to compatible equipment with RS485 or 4–20mA interfaces without a separate meter.
5. Can I configure the sensor using a mobile phone?
Yes. A mobile app can be used for data collection, configuration, and maintenance through a supported wired connection or wireless network.
6. What settings can be adjusted through RS485?
Configurable parameters include the slave address, baud rate, calibration, factory reset, 4–20mA output range, proportional coefficient, and incremental compensation.
7. Is the probe replaceable?
Yes. The NS-CL128 features a replaceable probe.
8. What is the operating temperature range?
The specified ambient operating temperature is 0–60°C.
9. Is the sensor suitable for continuous water monitoring?
Yes. It is designed for continuous residual chlorine monitoring in water treatment and other applicable water quality control systems.