Precision Online Sensors & Multi-Parameter Analyzers
Pre-aged 48 hours and individually calibrated in our Shanghai specialized facilities to withstand aggressive salinity, high pressure, and steam sterilization environments.
High Temp (0-130℃) pH Sensor
Built-in Pt1000/Pt100 temperature compensation with pressurized gel electrolyte for harsh chemical pipelines and high salinity thermal brine.
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Pharma Fermentation pH Sensor
Sterilizable glass membrane rated for repeated SIP/CIP protocols, maintaining stable electro-potential through viscous saline culture broths.
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S8 Connector High-Temp pH Sensor
Standard S8 PG13.5 process connection designed for seamless integration into bioprocess vessels and saline liquid circulation modules.
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Heavy-Duty (0-130℃) pH Sensor
Polymerized solid electrolyte eliminates junction clogging across high TDS, chemical synthesis lines, and evaporative concentration stages.
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pH5806 High Temp pH Sensor
Shanghai Brand certified sensor engineered for bioreactors, autoclave cycles, and extreme ionic strength industrial monitoring loops.
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DOG-208FA High Temp DO Sensor
Polarographic dissolved oxygen sensor resistant to high-pressure thermal cleaning, delivering accurate DO even in high-salinity culture loops.
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IOT-485-pH Digital Smart Sensor
Internal microprocessor supporting direct RS485 Modbus-RTU protocol, transmitting noise-free data straight to telemetry gateways.
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ZDYG-2088-01QX Turbidity Sensor
Near-infrared 90-degree scattered light optical sensor with mechanical wiper for long-term unassisted deployment in brackish estuary waters.
View Sensor Details →Evolutionary Trends in Water Salinity & Conductivity Metrology
How digital transformation, seawater desalination, and automated chemical extraction are reshaping global specifications for salinity instrumentation.
Inductive Toroidal Sensor Dominance
Traditional two-electrode contacts foul rapidly in high-salinity seawater and wastewater. The industrial sector is transitioning heavily toward inductive (toroidal) non-contact sensors that utilize magnetic fields, eliminating electrode polarization and chemical erosion entirely.
Native Edge-to-Cloud Modbus Telemetry
Modern plant architectures bypass costly dedicated intermediate transmitters. Modern digital salinity sensors embed internal A/D converters, processing microchips, and flash storage to transmit RS485 Modbus data directly into IoT edge gateways and SCADA infrastructures.
Predictive Fouling & Auto-Diagnostics
With remote unattended stations becoming widespread, sensor firmware now continuously monitors electrode impedance dynamics and polarization curve slopes, triggering autonomous predictive cleaning alarms before drift compromises control loops.
End-to-End Factory Capabilities You Can Audit
Shanghai BOQU Instrument operates 4,632 m² across two specialized manufacturing centers in Kangqiao and Lingang, handling every stage from raw electrode fabrication to complete analyzer integration.
China's First High-Temp Lab
Our facility houses specialized high-temperature water quality sensor testing benches capable of simulating pressurized thermal cycles up to 130℃ and cycling saturated salinity shocks to guarantee zero drift upon field startup.
48-Hour Burn-In & Aging
No sensor or analyzer leaves the workshop without enduring a full 48-hour continuous power burn-in, electro-chemical stability stabilization, and secondary calibration check against standard salinity buffer solutions.
Full OEM/ODM Engineering
Custom threaded fittings (NPT, PG13.5, flange, sanitary tri-clamp), private label silkscreening, bespoke cable lengths with IP68 potting, and custom Modbus registers customized to your DCS/PLC protocols.
Macro-Industry Salinity & Conductivity Architectures
Tailored configurations solving salinity measurement challenges in high-fouling, thermal stress, and regulated compliance process waters.
| Industry Sector | Typical Salinity / Conductivity Range | Recommended Sensing Technology | System Architecture & Output Interface |
|---|---|---|---|
| Seawater Desalination (SWRO) | 0 – 70 PSU (up to 100,000 µS/cm) | Inductive Toroidal Sensor (Corrosion-resistant PVDF/PEEK) | Dual-channel transmitters (DCA130) with 4-20mA to dosing pumps and RS485 to supervisory SCADA. |
| Marine RAS Aquaculture | 15 – 38 PSU (ppt salinity) | Digital RS485 Conductivity/Salinity Probe + Optical DO | Integrated bus looped directly to automated aeration variable frequency drives and sea intake valves. |
| Power Plant Boiler Feed (SWAS) | 0.055 – 10 µS/cm (Trace Cation Conductivity) | Precision Stainless Steel / Titanium 2-Electrode Sensor (Cell Constant K=0.01/0.1) | Sample conditioning rack with temperature-regulated cooling block and online degassed cation analyzers. |
| Chemical CIP & Caustic Recovery | 0 – 2,000 mS/cm (Acid/Base Concentrations) | Heavy-Duty Electrodeless Toroidal Concentration Probe (SJG-2083CS) | Direct % concentration calculation (NaOH, HNO₃) driving sanitary pneumatic valves during line flushes. |
| Biopharma Fermentation | 1 – 200 mS/cm under Steam Sterilization | High-Temperature PG13.5 Electrodes (pH5806 & High-Temp EC) | Autoclave-safe cable connectors, FDA-grade seal rings, sending isolated mV or digital Modbus to fermenter PLC. |
International Regulatory Compliance & Supply Chain Resilience
Meeting the operational, technical, and regulatory requirements of international EPCs, system builders, and environmental ministries.
Full CE, ISO & FDA Registration
Operated strictly under ISO 9001:2015 Quality Management and ISO 14001 Environmental Management Systems. All electronic controllers and active sensors are CE certified, with wet-wetted materials satisfying FDA regulations for hygienic processing.
Volume Supply Continuity
Dual factories safeguard municipal tenders and major industrial projects from supply bottlenecks. We maintain safety inventory of high-purity glass blanks, PEEK injection blanks, and micro-controllers to meet bulk orders in 1 to 2 weeks.
Localized Engineering Support
Exported to over 100 countries including the USA, Germany, Russia, Korea, Brazil, and Vietnam. Our application engineering center delivers remote commissioning, factory acceptance testing (FAT) video verification, and custom wiring guides.
R&D Technology Roadmap: The Next-Gen Salinity Metrology
Advancing water analysis through optical refractometry, micro-electro-mechanical systems (MEMS), and ultra-low power harvesting.
Phase 1: Hybrid MEMS Salinity-Conductivity Core
Integration of multi-cell micro-gap electrodes onto single chip substrates, delivering simultaneous ultra-wide dynamic range measurements from ultra-pure water (0.01 µS/cm) to saturated brine (300 mS/cm) without changing cell constant parameters.
Phase 2: Self-Powered Energy-Harvesting Telemetry
Development of ultra-low-consumption NB-IoT and LoRaWAN salinity sensor nodes capable of running 5+ years on integrated battery-micro-hydro systems, enabling continuous salinity tracking across offshore marine cages and remote irrigation networks.
Phase 3: AI-Driven Biofouling Compensation
Machine learning models running directly on sensor micro-controllers to distinguish between actual ionic changes and biofilm growth on electrodes, automatically adjusting calibration curves and triggering targeted acoustic anti-fouling transducers.
Integrated Online Analyzers & Multi-Parameter Panels
Complementary water quality analytical hardware engineered to pair with our salinity and conductivity sensing technologies.
DCA130 Dual Channel Analyzer
Measures pH and EC/Salinity concurrently on an isolated dual display with dual 4-20mA outputs and relay control for fertigation and RO systems.
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MPG-6099Plus Multi-Parameter
Integrated multi-parameter panel station combining salinity, pH, residual chlorine, turbidity, and dissolved oxygen on one central touch screen.
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pHG-2081Pro Online Analyzer
Industrial IP65 transmitter designed for harsh chemical processing, desalination pre-treatment, and automated neutralization control loops.
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SJG-2083CS Concentration Meter
High-conductivity concentration meter ideal for acid/base bath titrations, CIP sanitation loops, and heavy brine chemical recovery.
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Residual Chlorine Analyzer
Amperometric continuous free chlorine analyzer with stable hydrodynamic flow cell, preventing biofilm buildup in saline distribution lines.
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Online Silicate / Phosphate Analyzer
Trace-level colorimetric SWAS analyzers protecting high-pressure turbines and boiler tubes against silica scaling and chemical carryover.
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TOC-3042 Online TOC Analyzer
UV-persulfate oxidation analyzer measuring total organic carbon across water reuse plants, pharmaceutical loops, and influent streams.
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Online COD / TP / TN / NH3-N
Automated environmental discharge monitor with auto-calibration and self-cleaning fluidics, meeting EPA and local outfall compliance laws.
Explore Specifications →Frequently Asked Questions by Industrial Buyers & Engineers
Everything you need to know about salinity metrology, sensor lifetime, factory customization, and installation.
What is the primary difference between toroidal (inductive) and contacted electrode salinity sensors?
Contacted electrode sensors utilize metal pins (such as platinum, graphite, or stainless steel) placed directly into the liquid. They are highly accurate in pure and clean water but suffer from polarization, mineral scale accumulation, and chemical oxidation when measuring high-salinity seawater, brine, or wastewater.
Toroidal (inductive electrodeless) sensors encapsulate excitation and receiver magnetic coils within non-metallic materials like PEEK or PVDF. Current is induced through the solution loop without physical metal-liquid contact, making inductive sensors virtually maintenance-free and impervious to high-salinity fouling or aggressive corrosive agents.
How is Salinity (PSU / ppt) calculated from Electrical Conductivity (EC)?
Salinity cannot be measured directly by electrical circuits; it is derived through the Practical Salinity Scale (PSS-78) or UNESCO equations which correlate the liquid's conductivity and absolute temperature. BOQU smart sensors and digital transmitters feature built-in Pt1000 temperature sensors and high-speed micro-controllers running standard PSS-78 algorithms, calculating salinity in PSU (Practical Salinity Units), ppt, or g/kg in real-time with automatic non-linear temperature compensation.
Can BOQU salinity and conductivity sensors survive steam sterilization (SIP) and autoclaves?
Yes. As a leading manufacturer with China's dedicated high-temperature sensor laboratory, BOQU manufactures high-temperature pH, DO, and conductivity probes designed for bioreactors and pharmaceutical fermenters. Models like the pH5806 and high-temperature conductivity lines utilize specialized high-temperature glass, solid polymerized electrolyte bridges, and FDA-approved fluoroelastomers rated for continuous process temperatures up to 130℃ and steam sterilization cycles.
What digital communication protocols do your sensors output for automated SCADA integration?
We provide two flexible system approaches: First, our IoT digital sensors feature built-in electronics providing RS485 Modbus-RTU directly from the waterproof cable head, allowing multi-drop connection of dozens of sensors into PLCs, DCS systems, or IoT wireless transmitters without purchasing dedicated controllers. Second, our wall/panel transmitters (such as DCA130, pHG-2081Pro) provide dual isolated 4-20mA analog current loops alongside programmable high/low relay alarm contacts and RS485 communication.
What are BOQU's minimum order quantities (MOQ) and lead times for OEM/ODM orders?
Because we operate our own 4,632 m² production lines across Kangqiao and Lingang, our wholesale MOQs are flexible. Standard OEM private labeling and customized thread fittings can be provided for pilot batches of 5-10 units, while full custom ODM engineering (firmware adaptation, custom housings) is available for distributors and system integrators. Standard inventory ships in 2 to 5 business days, while volume OEM orders generally dispatch within 2 weeks.