High Temp 0-130℃ pH/EC Analytical Sensor
Pt1000/NTC30K integral compensation, pressurized gel electrolyte, rugged polymer body designed for industrial high-thermal processes.
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Direct Factory Sourcing
High-Precision Process Sensors & Transmitters
Engineered for mission-critical industrial applications, harsh chemical media, high pressures, and sanitary biopharma environments. ISO 9001 and CE certified.
High-Temperature S8 Connector Process Sensor
Standard PG13.5 mechanical thread with IP68 S8 quick-plug terminal. Ideal for sanitary bioreactors and high-purity water skid arrays.
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Heavy-Duty 0-130℃ Process Water Sensor
Engineered with high alkali-resistant glass and double ceramic diaphragms for zero-drift long-run measurement in effluent and boilers.
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Pharma Fermentation Sterilizable Sensor
Withstands 135℃ SIP/CIP repeated steam sterilizations. Non-toxic biocompatible solid polymer reference compliant with FDA/USP standards.
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pH5806 Flagship High-Temperature Electrode
Shanghai Brand certified precision electrode engineered for continuous harsh-duty bioprocesses and extreme hot chemical processing.
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DCA130 Online Dual-Channel pH & EC Analyzer
Simultaneous dual-parameter tracking for RO pre-treatment, agricultural hydroponics, and cooling towers. Dual 4-20mA & RS485 Modbus.
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IOT-485 Digital Smart Online Water Sensor
Microprocessor-embedded probe outputting RS485 Modbus RTU directly into SCADA, PLC, or edge IoT gateways without external transmitters.
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SJG-2083CS Inductive Toroidal EC Meter
Non-contact electrodeless sensor for high-salinity brines, CIP acid/caustic titrations, and chemical dosing up to 2000 mS/cm.
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Technical Whitepaper
Global Trends in Industrial Conductivity & TDS Metrology
How precision electrical conductivity (EC) and Total Dissolved Solids (TDS) sensors are driving Industry 4.0 water management and closed-loop process automation.
In modern industrial process engineering, liquid electrical conductivity (EC) and calculated Total Dissolved Solids (TDS) serve as primary telemetry for measuring ionic concentrations, detecting dissolved mineral contamination, tracking purification membrane degradation, and controlling chemical titration. With the global acceleration toward zero-liquid discharge (ZLD), steam turbine protection via SWAS (Steam and Water Analysis Systems), and automated high-density vertical hydroponics, the market demand for wholesale TDS and conductivity sensors has shifted significantly from basic analog galvanic cells to intelligent, temperature-compensated digital analytical instruments.
Historically, overseas procurement officers and system integrators faced trade-offs between delicate European laboratory-grade sensors with prohibitive price tags and low-tier consumer probes prone to electrochemical polarization, electrode fouling, and rapid calibration drift. Today, advancements pioneered by leading Chinese Tier-1 manufacturers such as Shanghai BOQU Instrument Co., Ltd. have reshaped global procurement dynamics. By combining automated electrode polishing, high-purity platinum plating, solid-state polymer reference matrices, and advanced micro-transmitters into cost-resilient wholesale portfolios, modern industrial plants achieve analytical accuracy down to 0.01 μS/cm in ultra-pure water and up to 2,000 mS/cm in aggressive brine streams.
Direct-to-Cloud Digital Architecture
The elimination of centralized standalone transmitters. Smart sensors now feature integrated digital signal processors (DSP) running Modbus RTU RS-485 directly to edge computing units, reducing installation hardware costs by up to 45% across large telemetry layouts.
Toroidal (Inductive) Superiority
Widespread adoption of electrodeless toroidal sensors for dirty, oily, and high-salinity media. Because measurement coils are encapsulated hermetically in PEEK or PVDF bodies, direct electrolytic corrosion and polarization errors are completely eliminated.
Dynamic Multi-Curve Temperature Compensation
Conductivity variance can swing by 2% to 7% per degree Celsius depending on the ion species. State-of-the-art sensors feature embedded Pt1000 RTD elements coupled with algorithmic non-linear pure water and acid-base ionization lookup matrices.
Engineering Selection Guide
Cell Constant (K-Value) & Topology Engineering Matrix
Choosing the correct cell geometry is paramount to avoid sensor saturation, current crowding, and fringe field errors.
Electrical conductivity is calculated by measuring electrolytic resistance (R) across two or more electrodes separated by a defined geometry. The relationship is governed by the cell constant \( K = L / A \), where L is the liquid path length and A is the electrode surface area. Selecting an improper cell constant results in diminished resolution at low conductivities or severe polarization impedance at high ionic densities. Review our industrial engineering selection matrix below:
| Cell Constant (K) | Electrode Topology | Measuring Range | Optimal Process Applications | Wetted Materials |
|---|---|---|---|---|
| K = 0.01 cm⁻¹ | Concentric Dual-Cylinder | 0.01 – 20.00 μS/cm (0 – 10 ppm TDS) | Semiconductor UPW, Power Plant SWAS Condensate, WFI Boiler Feed | 316L Stainless Steel / Titanium & PTFE |
| K = 0.1 cm⁻¹ | Dual-Platinum Disc | 0.1 – 200.0 μS/cm (0 – 100 ppm TDS) | Reverse Osmosis (RO) Permeate, Demineralizers, Clean Condensate | Platinum / Titanium / Polycarbonate |
| K = 1.0 cm⁻¹ | 2-Pole / 4-Pole Graphite | 10 – 20,000 μS/cm (5 – 10,000 ppm) | Municipal Drinking Water, Cooling Towers, Aquaculture, Wastewater Outfalls | Pyrolytic Graphite, 316L, Epoxide Body |
| K = 10.0 cm⁻¹ | Heavy Platinum Plate | 1,000 – 200,000 μS/cm (1 – 100 ppt) | Seawater Desalination, Textile Printing Brines, Chemical Reaction Tanks | Platinum Black Plated, Glass / PEEK |
| Inductive (Toroidal) | Non-Contact Dual-Toroid | 100 – 2,000,000 μS/cm (Concentration) | Clean-In-Place (CIP) 0-10% NaOH/HNO₃, Scrubber Blowdown, Mining Slurry | Molded PEEK / PVDF / PFA Encapsulated |
China Factory 4.0
Supply Chain Resilience, Automation & Scale Advantage
Inside Shanghai BOQU Instrument's 4,632 m² Kangqiao and Lingang automated manufacturing centers.
In the wake of worldwide supply chain disruptions and geopolitical trade adjustments, global multinational engineering firms, EPC contractors, and water treatment equipment manufacturers require supply partners that offer more than competitive unit pricing—they require bulletproof supply chain resilience, guaranteed raw material sovereignty, and audited traceability.
Operating from two fully owned advanced production bases in Shanghai's Kangqiao and Lingang industrial corridors, Shanghai BOQU Instrument Co., Ltd. (founded 2007) maintains complete internal vertical integration. From precision automated CNC glass-blowing of high-impedance glass membranes to high-vacuum electrode platinum sputtering, multi-layer SMT circuit printing, hermetic PEEK resin molding, and environmental thermal aging chambers, our facilities execute every critical fabrication milestone in-house.
100% In-House Cleanroom SMT
Complete control over analog front-end (AFE) circuit assembly and firmware programming, ensuring zero component supply bottleneck and guaranteed 10-year platform spare-part availability.
48-Hour Active Stress Burn-In
Every single conductivity sensor and digital transmitter undergoes uninterrupted 48-hour thermal stress testing and multi-point NIST-traceable standard calibration before packaging.
Massive 100,000+ Annual Capacity
Standard OEM/ODM orders are fulfilled with predictable 5-to-10 day turnaround times, insulated from third-party sub-tier supplier delays and ocean freight volatility.
Full Tier-1 Certifications
Audited strictly under ISO 9001 quality management and ISO 14001 environmental frameworks. All sensors carry CE conformity, RoHS compliance, SGS factory audit certification, and FDA clearance.
Procurement Economics
Wholesale Pricelist Architecture & OEM Tier Structure
Transparent benchmark manufacturing costs, MOQ volume breaks, and customization frameworks for global distributors and skid builders.
In B2B analytical instrumentation procurement, overall equipment lifetime value relies on balancing initial acquisition costs with long-term MTBF (Mean Time Between Failures). When buying direct from Shanghai BOQU Instrument, global clients bypass 3 to 4 layers of export-import middlemen, achieving 35% to 60% procurement savings compared to equivalent European or North American branded sensors.
| Sensor Model / Category | Sample MOQ (1-9 Units) | Tier 1 (10-49 Units) | Tier 2 (50-199 Units) | OEM Container (200+ Units) | Lead Time |
|---|---|---|---|---|---|
|
Standard 2-Electrode EC/TDS K=0.1 or 1.0, 316L/Polycarbonate, NTC30K |
$38 – $55 | $30 – $42 | $24 – $32 | Inquire Contract OEM | 3 – 5 Days |
|
Smart Digital RS485 Sensor Embedded MCU, Modbus RTU, 12-24VDC |
$85 – $120 | $70 – $92 | $58 – $75 | Custom Firmware Tier | 5 – 7 Days |
|
High-Temperature Sanitary EC 0-130℃, 316L Tri-Clamp, Steam Sterilizable |
$110 – $165 | $90 – $135 | $75 – $110 | Pharma Skids Custom | 7 – 10 Days |
|
Inductive Toroidal Sensor 0-2,000 mS/cm, Molded PEEK, Acid/Alkali |
$220 – $320 | $180 – $260 | $145 – $210 | Distributor Agreement | 10 – 14 Days |
|
Dual-Channel Transmitter Panel DCA130 pH + EC, Dual 4-20mA, Relays |
$190 – $280 | $155 – $220 | $125 – $175 | Private White-Label | 5 – 8 Days |
OEM/ODM Value Added Services: Shanghai BOQU provides private label laser etching, custom thread geometry (NPT 1/2", 3/4", PG13.5, Tri-Clamp flange), custom cable jacket polymers (PTFE, Silicone, PUR) up to 100 meters, customized Modbus register mapping, and multilingual transmitter firmware localization at zero setup fee for contract volume partners.
Engineered Implementations
Industrial Application Scenarios Across Five Continents
From biopharmaceutical steam lines to heavy industrial seawater desalination arrays, BOQU conductivity sensors power high-uptime processes globally.
Industrial Wastewater & Zero Liquid Discharge (ZLD)
Monitors ionic discharge compliance, membrane brine concentration, and heavy metal neutralization tanks. Multi-parameter Modbus telemetry alerts plant operators before statutory limit exceedances occur.
Effluent Monitoring
0-20,000 μS/cm
RS-485 Modbus
Thermal & Nuclear Power Generation (SWAS)
Supercritical boiler feedwater demands cation and specific conductivity resolution down to 0.01 μS/cm. Stainless steel K=0.01 flow cells detect trace silica, sodium, and carbon dioxide ingress, protecting multi-million dollar turbines from scale formation.
K=0.01 Flow Cell
316L Sanitary
Turbine Protection
Biopharma Fermentation & CIP Scavenging
Endures repetitive 130℃ steam-in-place (SIP) cycles without calibration drift. Monitors cleaning-in-place caustic and acid interface rinse cycles, drastically cutting pure water wastage and cycle duration.
130℃ Sterilizable
Toroidal Induction
CIP Acid/Alkali
Commercial Hydroponics & Vertical Agriculture
Nutrient uptake depends strictly on EC and TDS maintenance. BOQU dual-channel pH and EC transmitters manage automated fertilizer injection skids across commercial farms in Brazil, Korea, and Europe.
DCA130 Controller
EC / TDS Dual Loop
Dosing Relay Out
Municipal Water Supply & Desalination Skids
Integrates with multi-stage Reverse Osmosis (RO) skid racks to verify salt rejection indices in real-time. High-reliability sensors prevent membrane breakthrough in coastal municipal water facilities.
RO Permeate
K=0.1 Precision
Municipal Standards
Intensive Marine & Freshwater RAS Aquaculture
Salinity and TDS drift triggers lethal osmoregulatory shock in juvenile fish and shrimp stocks. BOQU ruggedized graphite sensors ensure 24/7 continuous water telemetry linked directly to alarms.
Salinity / TDS
Zero-Polarization
IP68 Submersible
Complete Online Instrumentation Portfolio
Online Water Quality Analyzers & Specialized Probes
Integrate our certified transmitters and multi-parameter panels into your process skids with complete OEM private-label branding.
DOG-208FA High-Temp Dissolved Oxygen Sensor
Sterilizable polarographic DO sensor for hot biotech fermentation and oxygen scavenger verification in high-pressure steam boilers.
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ZDYG-2088-01QX Online Turbidity & TSS Probe
860nm NIR scattered light optical sensor with pneumatic self-cleaning wiper brush for high-suspended solids wastewater effluent.
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MPG-6099Plus Multi-Parameter Skid Panel
Turnkey wall-mount system consolidating pH, EC/TDS, Free Chlorine, Turbidity, and DO with flow cell manifold and integrated data logger.
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pHG-2081Pro Industrial Process Transmitter
NEMA 4X / IP65 enclosure, dual isolated 4-20mA process signals, and configurable high/low PID relays for chemical acid neutralization skids.
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Online Residual Chlorine Amperometric Analyzer
Constant-voltage amperometric sensor for continuous drinking water disinfection dosing without requiring toxic chemical DPD reagents.
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Power SWAS Silicate / Phosphate Analyzer
Trace-level colorimetric wet chemical analyzer delivering sub-ppb accuracy for silica deposition prevention in turbine superheaters.
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TOC-3042 Online Total Organic Carbon Monitor
High-precision UV-persulfate oxidation method engineered for USP/EP compliant pharmaceutical Purified Water and WFI loops.
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Online COD / TP / TN / NH3-N Analytical Station
Automatic digestion spectrometry system with multi-stream sampling for EPA/national environmental discharge compliance telemetry.
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Technical Best Practices
Operational Reliability: Calibration & Cable Runs
Expert protocols to eliminate parasitic capacitance, high-frequency EMF interference, and reference drift in field deployments.
Procuring high-quality sensors represents only the first stage of analytical reliability. In high-precision conductivity metrology, installation topology dictates field accuracy. Below are key engineering rules recommended by BOQU senior instrumentation engineers:
- Cable Distance & Parasitic Capacitance: For traditional analog conductivity sensors (especially K=0.01 and K=0.1 cells), cable lengths exceeding 10 meters introduce significant cable resistance and parasitic capacitance, falsifying readings. We recommend utilizing our IOT-485 digital smart sensors for cable runs above 10m, as RS-485 Modbus retains 100% digital data integrity up to 1,200 meters.
- Flow Velocity & Air Bubble Entrapment: Conductivity flow cells must be installed in an inverted or vertical upflow configuration. Air bubbles clinging to the electrode surfaces disrupt the electrical field geometry, falsely reducing conductivity readings. Maintain an upward flow velocity between 0.2 m/s and 1.0 m/s.
- Standard Calibration Traceability: Always standardize sensors using certified KCl solutions (e.g., 84 μS/cm, 1413 μS/cm, 12.88 mS/cm). Never calibrate low-conductivity sensors (K=0.01) open to the atmosphere, as atmospheric carbon dioxide dissolves rapidly into deionized water, generating carbonic acid and causing significant positive drift.
Wholesale Inquiries
Frequently Asked Questions for B2B Importers & OEMs
Clear, direct answers regarding factory certifications, custom manufacturing, logistics, and wholesale volume pricing.
Is Shanghai BOQU Instrument an authentic manufacturer or a trading company?
Shanghai BOQU Instrument Co., Ltd. is an authentic direct manufacturer founded in 2007 in Shanghai, China. We operate two modern production hubs across Pudong (Kangqiao) and the Lingang Free Trade Zone encompassing 4,632 m² of workshop space. We employ over 200 dedicated production staff and R&D engineers, producing in excess of 100,000 analytical instruments and sensors per year. Overseas buyers and third-party inspectors (SGS/TÜV) are always welcome to conduct on-site factory audits.
What is the conversion relationship between Conductivity (EC) and TDS in your instruments?
Conductivity directly measures electrolytic conductance in μS/cm or mS/cm, whereas Total Dissolved Solids (TDS) is a calculated metric expressed in ppm (mg/L). BOQU analyzers provide programmable conversion coefficients between 0.40 and 1.00 (factory default is typically 0.50 for standard NaCl solutions or 0.65 for multi-ion agricultural / potable water). This allows engineers to calibrate TDS calculation accurately to their regional water profile.
Can you support OEM private labeling, custom logos, and custom thread dimensions?
Yes. OEM/ODM partnerships represent over 40% of our global export turnover. We offer fiber laser logo marking on stainless steel or polymer sensor shells, private-labeled silk-screened transmitter enclosures, custom cable colors, branded cardboard packaging, and customized CNC process connections including 1/2" NPT, 3/4" NPT, G3/4", PG13.5, and Tri-Clamp sanitary flanges.
What international certifications accompany export shipments?
Our company operates under ISO 9001 quality management and ISO 14001 environmental management systems. All exported sensors and analyzers feature CE conformity, RoHS hazardous substance compliance, and SGS audit reports. Biopharma sanitary models are produced using FDA-compliant USP Class VI grade wetted materials. Certificate of Origin (CO, Form E, Form F) can be issued for customs duty optimization.
What are your minimum order quantities (MOQ) and production lead times?
For standard catalog sensors and controllers, our sample MOQ is 1 unit to allow qualification and bench testing. Standard wholesale volume tiers start at 10 units, with container pricing at 200+ units. Standard catalog items ship within 3 to 5 business days, while customized OEM production runs ship in 10 to 15 business days via air express (DHL, FedEx, UPS) or ocean freight.
How does your factory ensure long-term sensor stability and prevent calibration drift?
Every BOQU sensor undergoes a rigorous three-step quality gate: First, microscopic inspection of electrode coatings (platinum plating or pyrolytic graphite polishing). Second, 48 hours of uninterrupted thermal cycle burn-in testing to relieve internal epoxy and glass stress. Third, a 5-point NIST-traceable standard liquid calibration curve validation. Calibration certificates with serial numbers are included with each device.
Direct Engineering Support
Request an Official Factory Pricelist & Technical Catalog
Contact our Shanghai application engineering desk directly for volume discounts, skid engineering consultation, or sample trials.