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Digital Residual Chlorine Sensor for Water Quality Monitoring

This high-precision residual chlorine sensor employs a three-electrode constant potential design to deliver accurate, real-time measurements of free chlorine (ClO⁻/HClO) in water systems. With a wide measurement range (0-20.00 ppm) and resolutions down to 0.001 ppm, it ensures reliable monitoring for drinking water safety, industrial effluent compliance, and aquaculture management. The sensor integrates pH compensation to minimize measurement drift and supports Modbus RTU over RS485 for seamless integration into SCADA, IoT, or industrial control systems. Encased in a durable, IP68-rated housing with G3/4 thread options, it offers flexible installation in flow-through or submerged environments. Automatic calibration commands and an optional self-cleaning electrode cover ensure long-term stability and reduced maintenance.

    Product Paramenters

    Product Name Residual Chlorine Sensor
    Model LMS-HCLO100
    Range Residual chlorine meter: 0 - 20.00 ppm Temperature: 0- 50.0℃
    Accuracy Residual chlorine meter: ± 5.0% F.S, supporting pH compensation function Temperature: ±0.5 ℃
    Power 6VDC-30VDC
    Material Polymer Plastic
    Warranty period Electrode head 12 months/digital board 12 months
    Sensor Interface Supports RS-485, MODBUS protocol
    Cable length 5m, can be extended according to user need
    Application Tap water treatment, swimming pool water quality monitoring, and industrial wastewater treatment.

    Product Features

    ① Three-Electrode Constant Potential Technology
    Ensures stable measurements by minimizing polarization effects and interference from pH fluctuations, even in dynamic water conditions.
    ② Multi-Range Resolution & pH Compensation
    Supports resolutions from 0.001 ppm to 0.1 ppm and automatic pH compensation to enhance accuracy in varying water chemistries.
    ③ Modbus RTU Integration
    Pre-configured with default address (0x01) and baud rate (9600 N81), enabling plug-and-play connectivity to industrial automation systems.
    ④ Robust Design for Harsh Environments
    IP68-rated housing and corrosion-resistant electrodes withstand prolonged submersion, high-pressure flows, and temperatures up to 60℃.
    ⑤ Low Maintenance & Self-Diagnostics
    Features automatic zero/slope calibration commands, error code feedback, and optional protective covers to reduce biofouling and manual upkeep.

    Application

    1. Drinking Water Treatment
    Monitor residual chlorine levels in real time to ensure disinfection efficacy and regulatory compliance.
    2. Industrial Wastewater Management
    Track chlorine concentrations in effluents to meet environmental discharge standards and avoid penalties.
    3. Aquaculture Systems
    Prevent over-chlorination in fish farms to protect aquatic life and optimize water quality.
    4. Swimming Pool & Spa Safety
    Maintain safe chlorine levels for public health while avoiding corrosive over-dosing.
    5. Smart City Water Networks
    Integrate into IoT-based water quality monitoring systems for urban infrastructure management.
    application

    Digital RS485 water quality sensors technical data

    Parameter Model Range Accuracy
    DO sensor LMS-DO10B 0-20mg/L, 0-60℃ ±0.1-0.3mg/L
    DO sensor LMS-DO10C 0-20mg/L, 0-60℃ ±0.3mg/L
    Trace DO sensor LMS-TDO100 0-2000ppb, 0-50℃ ±1ppb
    PH sensor LMS-PH100 0-14pH ±0.02pH
    ORP sensor LMS-ORP100 ±1000.0 mV ±0.2 mV
    EC/TDS sensor LMS-TDS102 CT: 0-9999uS/cm; 0-100mS/cm;
    TDS: 0-10000ppm
    ±2.5%FS
    Salinity/EC/TDS sensor LMS-SAL104 Conductivity: 0.1-500 mS/cm
    TDS:0-60000ppm
    Salinity: 0-500.00ppt
    ±1.5%FS
    COD sensor LMS-COD100 COD:0.1-1500mg/L
    TOC:0.1-750mg/L
    BOD:0.1-900mg/L
    Turbidity: 0.1-4000NTU
    Temperature range: 0-50 ℃
    ±5% equiv.KHP Temperature: ± 0.5 ℃
    TSS sensor LMS-TSS100 0-50000mg/L/ 0-120000mg/L ±10%FS or 10 mg/L
    Turbidity sensor LMS-TUR10L 0-100NTU ±10%FS or 0.3 NTU
    Turbidity sensor LMS-TUR10H 0-3000NTU ±10%FS or 0.3 NTU
    CO2 sensor LMS-CO2100 2000PPM/10000PPM/50000PPM ±5%FS
    Ammonia Nitrogen sensor LMS-NH4100 0-1000 mg/L ±5%FS
    Ion Selective sensor LMS-ION100 0-1000 mg/L ±5%FS
    Oil in Water sensor LMS-OIL100 0-50 mg/L ; 0-5 mg/L ±3%FS
    Chlorophyll sensor LMS-CHL100 0-500ug/L ±3%FS
    Blue-Green Algae sensor LMS-BGA100 0-2000,000 cells/ml ±3%FS
    Residual Chlorine sensor LMS-HCLO100 0 - 20.00 ppm ±5%FS
    Marine Current sensor LMS-Current100 Temperature: -3℃ - 45℃
    Velocity of flow: 0-500 cm/s
    Flow direction: 0-359.9°
    ±0.05℃ ±1 cm/s or ±2% ±2°
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