Continuous Disinfection
Online Residual Chlorine Analyzer
Continuous free and total chlorine monitoring equipped with auto-temperature and optional pH compensation to hold residuals precisely.
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Direct Factory Showcase (Part I)
High-Precision Residual Chlorine & Water Quality Probes
Verified electrochemical sensors and transmitters engineered for rigorous drinking water disinfection, wastewater effluent monitoring, and sterile industrial processing.
S8 Industrial Connector
Wholesale High-temp S8 pH Sensor
High-temperature industrial glass pH electrode built with standard S8 plug connector for fast swap, bioprocess vessels, and harsh scrubbers.
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Pharma & Fermentation
Pharma Fermentation pH Sensor
Designed specifically for biotechnology reactors, tolerating pressurized SIP steam sterilization up to 130°C without zero-point drift.
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0-130℃ Thermal Range
0-130℃ pH Sensor With Temp
Integrated Pt100/Pt1000 RTD element inside a pressure-resistant glass shell, delivering instant dynamic thermal equilibrium.
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Factory Direct Wholesale
High Temperature pH Sensor (0-130℃)
Solid gel electrolyte with porous PTFE annular diaphragm prevents poisoning in harsh chemical syntheses and hot wastewater pipes.
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Shanghai Brand Certified
pH5806 High Temperature pH Sensor
Flagship sensor proven across tier-one biopharmaceutical operations. Withstands multiple autoclaving and aggressive CIP/SIP regimes.
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Dissolved Oxygen
DOG-208FA High Temp DO Sensor
Polarographic dissolved oxygen electrode built for high-temperature fermentation broths, yielding ultra-stable DO signals.
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IoT Modbus RTU
IOT-485-pH Digital Sensor
Smart embedded microprocessor outputting Modbus RTU directly over RS485. Integrates into SCADA or PLC without transmitters.
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Macro Solutions & Market Dynamics
The Global Chlorine Sensing Ecosystem: Engineering & Market Demands
Residual chlorine measurement has shifted from intermittent manual DPD reagent titrations to solid-state, reagentless amperometric sensors integrated into digital smart water networks.
Amperometric Tri-Electrode Architecture
Modern chlorine probes utilize constant-voltage micro-amperometry. A gold cathode, counter-electrode, and Ag/AgCl reference eliminate the dependency on costly buffer solutions while delivering immediate sub-second response times to hypochlorous acid (HOCl) variations.
Dynamic pH & Temperature Decoupling
Because free chlorine partitions between HOCl and hypochlorite ions (OCl⁻) depending on water pH, BOQU chlorine probes incorporate multi-variable firmware that automatically computes total active biocidal capacity across fluctuating pH regimes (6.5–8.5).
Global Water Safety & WHO Compliance
International public health regulations dictate minimum residual disinfectant targets (typically 0.2 to 0.5 mg/L free chlorine at consumer points) to prevent microbial regrowth while limiting the formation of toxic disinfection by-products (DBPs) like trihalomethanes.
Local Compliance & Operational Reliability
End-to-End Compliance & Dedicated Regional Deployments
From municipal water treatment works in Southeast Asia to biopharmaceutical plants in Europe, BOQU provides certified process probes adapted to regional electrical and environmental standards.
Drinking Water Distribution Grids
Deployed in booster chlorination pump houses and secondary water networks. Probes resist pressure drops, providing 4–20mA telemetry and RS485 Modbus data directly to municipal SCADA centers for instantaneous chlorine dosage regulation.
Industrial Cooling Tower Biocide Dosing
Cooling loops require tight biological fouling management to inhibit Legionella pneumophila. Our residual chlorine probes endure high organic loads and chemical surfactants without premature electrode coating or measurement drift.
Global Certification & Traceability
Our instruments conform strictly to ISO 9001 and ISO 14001 frameworks. Every residual chlorine electrode passes rigorous 48-hour continuous stability validation against calibrated standard chlorine references before international dispatch.
Future-Ready Sensing Architectures
Technology Roadmap: The Future of Autonomous Water Analytics
How Shanghai BOQU is combining edge AI calibration, solid-state materials, and self-diagnostic optical chips to redefine process analytical technology.
Edge AI Self-Diagnostics & Health Indices
Upcoming sensor architectures integrate micro-impedance spectroscopy to continuously track reference electrode aging, membrane biofouling, and electrolyte exhaustion, predicting required maintenance 14 days before failure.
Hydrodynamic Self-Cleaning Flow Chambers
Mitigating biofouling through constant-velocity vortex micro-flow cells with optional ultrasonic transducer rings, lowering cleaning schedules from bi-weekly checks to biannual inspections in wastewater outfalls.
Cloud-Native Edge Protocols (MQTT/CoAP)
Transforming water quality transducers into native edge devices. Directly publishing encrypted water chemistry data to SCADA or cloud clusters without intermediary PLC gateways.
Technical Clarifications
Residual Chlorine Probe Engineering: FAQ
In-depth responses compiled by senior process engineers for utility operators and instrument engineers.
What is the difference between amperometric and colorimetric DPD residual chlorine analyzers?
Amperometric probes measure chlorine electrochemically by reducing hypochlorous acid on a polarized metal cathode, producing an electric current proportional to concentration in real-time without consumable reagents. Colorimetric DPD analyzers automate wet-chemistry batch sampling using buffers and DPD indicator reagents every few minutes, entailing recurring chemical purchases and waste disposal.
Why is sample flow velocity critical for constant-voltage chlorine probes?
Amperometric probes consume a minute quantity of chlorine ions at the working electrode surface during measurement. A constant flow velocity (typically 30–60 L/h through a specialized acrylic overflow cell) ensures a steady laminar diffusion layer. If flow drops or fluctuates, recorded chlorine values will decrease artificially.
How does pH variation alter free chlorine readings, and how does BOQU handle it?
Free chlorine exists as hypochlorous acid (HOCl) and hypochlorite ions (OCl⁻). Amperometric probes are primarily sensitive to HOCl, which is up to 80 times more biocidally potent. When pH shifts above 7.5, HOCl dissociates into OCl⁻. BOQU multi-parameter transmitters accept a dual pH electrode input to algorithmically recalculate true total free chlorine in real time.
Can BOQU produce customized OEM residual chlorine sensors and private labeling?
Yes. Shanghai BOQU Instrument provides extensive OEM/ODM manufacturing. This encompasses specialized immersion/flow thread enclosures, custom cable lengths up to 100 meters, customer-specified Modbus register maps, branded fascia plates, and bespoke transmitter firmware adapted to private client specifications.
Direct Factory Showcase (Part II)
Integrated Water Quality Analyzers & Specialized Transmitters
Comprehensive analytical solutions for power station SWAS, municipal networks, effluent compliance, and multi-parameter process control.
Optical Scattered Light
ZDYG-2088-01QX Turbidity Probe
Infrared 90° scattered light turbidity and TSS sensor featuring automated wiper cleaning to resist heavy biofouling in sludge and effluent streams.
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Dual Channel Controller
DCA130 Online pH & EC Analyzer
Simultaneous monitoring of pH and electrical conductivity on a single display, designed for space-constrained RO racks and hydroponics.
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Multi-Parameter Skid
MPG-6099Plus Water Panel
Comprehensive skid system aggregating residual chlorine, turbidity, pH, temperature, and conductivity for city distribution loops.
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Industrial Transmitter
pHG-2081Pro Online Transmitter
Rugged IP65 field-mount transmitter offering dual 4–20mA outputs, programmable high/low relays, and isolated RS485 communication.
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Toroidal Inductive
SJG-2083CS Chemical Meter
High-precision electrodeless conductivity meter tracking concentrated hydrochloric acid, sulfuric acid, and caustic soda in CIP recovery.
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Trace Power SWAS
Trace SWAS Steam Analyzers
Sub-ppb photometric and ion-selective trace monitoring designed for power utility boilers, superheaters, and steam turbines.
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Total Organic Carbon
TOC-3042 Online TOC Analyzer
Ultra-low detection threshold organic carbon analyzer meeting USP/EP compendial requirements for pharmaceutical WFI and purified loops.
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Effluent Compliance
Online COD/TP/TN/NH₃-N System
Automated wet-chemistry digestion analyzer delivering high accuracy for municipal sewage and industrial wastewater outfall verification.
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