High-Precision Industrial Probes & Analytical Assemblies
Engineered to withstand extreme thermal variance, aggressive chemical attack, and high osmotic pressures with sub-second response times and ultra-low drift characteristics.
China High Temperature (0-130℃) pH Sensor With Temperature Wholesaler, Suppliers
Integrated thermistor compensation designed for continuous high-temperature chemical neutralization and high-pressure process pipelines.
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China High-temperature pH Sensor Used Pharmaceutical Fermentation Wholesaler, Supplier
CIP/SIP autoclavable probe engineered with biocompatible polymeric electrolytes for bioreactors, food processing, and enzyme synthesis tanks.
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Wholesale High-temperature S8 Connector pH Sensor Manufacturers, Factory
Standardized PG13.5 and S8 threaded interface allowing seamless retrofitting into European and American inline probe insertion assemblies.
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Wholesale High Temperature (0-130℃) pH Sensor Supplier, Factories
Double-junction reference with micro-porous annular PTFE diaphragm prevents heavy metal ion poisoning and electrolyte leaching under high shear stress.
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pH5806 High Temperature pH Sensor
Flagship high-temperature electrode engineered for harsh steam sterilization cycles, petrochemical effluent, and multi-stage distillation plants.
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DOG-208FA High Temperature DO Sensor
Polarographic dissolved oxygen transducer providing stable parts-per-billion sensitivity for aerobic fermentation and boiler deaerator loops.
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IOT-485-pH Digital Online pH Sensor
Internal microprocessor with direct RS485 Modbus RTU telemetry, eliminating transmitter requirements and streaming real-time diagnostics to PLC/DCS.
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ZDYG-2088-01QX Online Turbidity Sensor
90-degree scattered light optical sensor equipped with integrated wiper mechanism for continuous suspended solids and clarifier turbidity monitoring.
View SpecificationsGlobal Industrial Landscape for Total Dissolved Solids Transducers
Cross-industry demand for high-reliability TDS meter probes is expanding exponentially across sovereign desalination grids, semiconductor micro-fabrication, and sustainable agriculture.
Desalination & Potable Networks
Global sea-water reverse osmosis (SWRO) facilities in the GCC, North Africa, and coastal Americas depend on rapid-response conductivity and TDS probes to detect membrane breach in milliseconds. Even minor pinhole breaches cause salt passage that degrades multimillion-dollar thermal infrastructure. Modern municipal networks demand continuous cell verification, factory-calibrated cell constants (K=1.0 and K=10.0), and minimal polarization errors under 45,000 ppm TDS conditions.
Semiconductor UPW & Power Steam
Ultra-pure water (UPW) loops in fabrication facilities and supercritical power plant Steam and Water Analysis Systems (SWAS) require trace-level detection down to fractional parts-per-billion (ppb). In these sub-microsecond ionic dissipation regimes, cell constants of K=0.01 and K=0.1 with titanium or electropolished 316L stainless steel electrodes are mandatory to avoid ion shedding, secondary oxidation, and flow-induced capacitive noise.
Smart AgTech & Bioreactor Loops
Next-generation hydroponics, vertical farming facilities, and industrial fermentation plants rely on dual-channel TDS/EC probes to automate nutrient dosing routines. Excessive ionic loading causes root osmolality collapse, while inadequate nutrient concentration stalls vegetative cycles. By shifting toward factory-integrated Modbus RTU probes, commercial greenhouses eliminate analog signal degradation across extensive 500-meter distribution trusses.
Physics of Conductometric Measurement, Cell Constants, & Electrochemistry
Understanding the conversion physics from electrical conductivity (EC, µS/cm) to total dissolved solids (TDS, ppm or mg/L) across non-linear ionic gradients.
The quantification of Total Dissolved Solids (TDS) via conductometric sensors does not directly measure mass; rather, it measures the bulk electrical conductance ($G$) of an electrolyte volume governed by the mobility and charge of solvated cations and anions. The fundamental governing relationship is defined as:
Where \(K_{cell}\) represents the geometric cell constant in cm-1, \(d\) is the inter-electrode spacing, and \(A\) is the effective cross-sectional wetted surface area. Translating conductometric values (\(\kappa\)) into gravimetric mass concentrations (TDS in ppm) requires mathematical scaling through an empirical empirical ionic conversion factor:
The conversion factor \(k_e\) varies dramatically according to chemical composition: 0.50 for pure NaCl brine, 0.65–0.70 for natural freshwater containing mixed carbonate/sulfate systems, and up to 0.85 for industrial wastewater concentrated with divalent salts like CaSO4. High-grade industrial probes engineered by Shanghai BOQU integrate selectable compensation curves (linear coefficient \(\alpha\) spanning 0.00% to 10.00%/°C, as well as non-linear ISO 7888 / DIN 38404 algorithms) to eradicate temperature-induced distortion from process thermals.
Electrode Architecture Comparison: 2-Pole vs 4-Pole vs Toroidal Inductive
| Probe Topology | Ideal Cell Constant (K) | Effective Measurement Range | Electrode / Wetted Material | Key Strengths & Limitations |
|---|---|---|---|---|
| 2-Electrode Classical | K = 0.01 to 0.1 cm-1 | 0.01 µS/cm to 200 µS/cm (0.005 - 100 ppm) | Grade 1 Titanium, 316L SS, Gold Flash | High precision at ultra-pure levels; susceptible to capacitive polarization errors at ionic strengths > 1,000 ppm. |
| 4-Electrode Multipole | K = 0.5 to 1.0 cm-1 | 10 µS/cm to 200,000 µS/cm (5 - 100,000 ppm) | High-Density Isostatic Graphite, Platinum | Inner sensing poles carry negligible current, eliminating lead wire resistance and polarization drift across wide dynamic spans. |
| Toroidal (Inductive Electrodeless) | K = 2.0 to 10.0 cm-1 | 100 µS/cm to 2,000,000 µS/cm (50 - 1,000,000 ppm) | Virgin PEEK, PVDF, PFA encapsulation | Zero metallic contact with medium; totally impervious to organic fouling, slurry abrasion, and aggressive acid/caustic corrosion. |
Localized Engineering Case Studies & Environmental Applications
Real-world integration across variable geochemical contexts, regulatory discharge ceilings, and hazardous chemical interfaces.
Middle East: Desalination
Thermal MSF and SWRO plants in the Persian Gulf encounter feed salinities exceeding 45,000 ppm TDS and temperatures above 48°C. BOQU's K=10 toroidal transducers endure constant cavitation and biological biofouling without requiring manual wipe cycles.
Cell K=10.0 PEEK Body Anti-CavitationNorth America: EPA Compliance
Zero Liquid Discharge (ZLD) plants in mining and industrial manufacturing require continuous outfall tracking under EPA NPDES protocols. BOQU digital RS485 sensors transmit direct Modbus registers to SCADA hubs without analog signal degradation.
NPDES Outfall Modbus RTU Zero DriftSoutheast Asia: Aquaculture
Intensive shrimp farming and RAS operations across Vietnam and Indonesia require strict salinity and TDS stabilization to prevent mortality during juvenile molting. BOQU 4-pole graphite sensors resist organic biofilm fouling in brackish waters.
Graphite Array Biofilm Immune IP68 SubmersibleEurope: Bio-Pharmaceuticals
Water-For-Injection (WFI) and CIP verification adhering to European Pharmacopoeia (EP 2.2.38) standards demand K=0.01 titanium probes calibrated with NIST-traceable standard solutions down to 0.055 µS/cm at 25°C.
NIST Traceable Tri-Clamp Sanitary FDA USP <645>Technology Roadmap & Next-Generation Sensor Innovations
Pioneering the convergence of edge computing, solid-state electrochemistry, and autonomous predictive maintenance.
Edge-AI Diagnostic Microkernels
Integrating 32-bit ultra-low-power ARM Cortex-M4 silicon directly into the sensor probe housing. The embedded firmware continuously tracks secondary phase impedance and parasitic double-layer capacitance at high frequencies, computing electrode health metrics and alerting operators to biofilm formation or scale buildup before measurement drift corrupts control loops.
Ultrasonic Self-Cleaning Piezo Arrays
Mitigating the single greatest operational expenditure in industrial wastewater—routine manual maintenance. Emerging BOQU probe prototypes incorporate micro-piezoelectric transducers that emit intermittent 40 kHz acoustic shockwaves directly along the wetted electrode surfaces, cavitating particulate films and calcium carbonate crystals without interrupting active continuous measurement cycles.
MEMS Thin-Film Micro-Sensors
Transitioning from manual mechanical lathing of titanium rods to cleanroom chemical vapor deposition (CVD) of platinum and boron-doped diamond (BDD) thin films on inert ceramic substrates. This delivers unmatched thermal equilibration, reducing sensor time constants (\(\tau_{90}\)) to under 200 milliseconds while enabling micro-footprint inline installations in biomedical dialysis and lab-on-a-chip setups.
China Factory Supply Chain Resilience & Production Scale
Vertical manufacturing autonomy from raw metallurgy and glassblowing to automated SMT PCB assembly and computerized calibration bays in Shanghai.
Full Stack Engineering Control: Kangqiao & Lingang Facilities
Unlike downstream brand assemblers that outsource core electrochemistry to unverified third parties, Shanghai BOQU Instrument Co., Ltd. exercises end-to-end sovereignty across every step of sensor production. At our Kangqiao sensor laboratory, glass electrodes are hand-blown, precision-annealed, and filled with proprietary gelled potassium chloride formulations. In our Lingang electronics manufacturing workshop, automated pick-and-place lines populate industrial-grade multi-layer circuit boards engineered to withstand -20°C to +70°C operating ambients.
Our supply chain architecture mitigates international sourcing vulnerabilities by securing high-purity titanium alloys, virgin PEEK rods, and premium optical sapphire windows directly from accredited tier-one metallurgical mills. Before packing, 100% of finished probes undergo a rigorous 48-hour continuous thermal cycling burn-in, dielectric isolation integrity checks, and multi-point calibration verification against certified NIST standard reference solutions. This manufacturing rigor achieves sub-0.5% failure rates across overseas warranty cycles.
Global Regulatory Compliance & OEM/ODM Bespoke Manufacturing
Accelerating product commercialization for global instrumentation distributors, engineering contractors, and private-label partners.
International Certifications
Every sensor and analyzer platform is manufactured under stringent ISO 9001 quality management and ISO 14001 environmental frameworks. All products hold CE conformity markings, undergo SGS third-party electrical safety audits, meet RoHS hazardous substance exclusions, and feature FDA-compliant food/drug contact wetted components.
Full Turnkey OEM / ODM
We provide comprehensive white-labeling solutions tailored to your market: CNC-machined custom insertion body lengths, specialized process connection threading (NPT, BSP, Tri-Clamp), proprietary firmware protocol customization (custom Modbus register mapping, Profibus DP, HART), laser-etched branding, and localized packaging suites.
Factory Direct Support & FAT
Dedicated English-fluent electrochemical application engineers provide full pre-sale engineering review, sizing computations, Factory Acceptance Testing (FAT) documentation, video audit verification, and guaranteed air-freight spare parts dispatch to keep your plants running without downtime.
Online Process Analyzers & Chemical Monitoring Controllers
Field-proven continuous water analysis controllers, dual-channel transmitters, and rack-mounted monitoring systems for plant automation.
DCA130 Online pH & EC Dual Channel Analyzer
Simultaneous real-time tracking of pH and conductivity/TDS on a single intelligent controller; ideal for commercial hydroponics and RO skid dosing.
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MPG-6099Plus Multi-parameter Water Quality Analyzer
Consolidated multi-parameter station combining pH, free chlorine, turbidity, and conductivity for secondary municipal supply stations.
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pHG-2081Pro Online pH Analyzer
Rugged industrial microcomputer transmitter with isolated 4–20 mA outputs, dual SPDT alarm relays, and RS485 communication protocols.
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SJG-2083CS Online Acid & Alkali Concentration Meter
Toroidal conductivity-based chemical strength transducer for CIP sanitization loops, regenerant lines, and industrial acid manufacturing baths.
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Online Residual Chlorine Analyzer
Continuous amperometric residual chlorine measurement without reagent consumption; ensures sanitary drinking water distribution compliance.
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Online Silicate / Phosphate / Sodium / Hydrazine Analyzer
Sub-ppb trace chemical colorimetric analyzer array preventing turbine blade silica deposition and boiler tube stress corrosion cracking.
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TOC-3042 Online TOC Analyzer
High-temperature catalytic oxidation monitor providing real-time Total Organic Carbon quantification for pharmaceutical water and influent streams.
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Online COD, TP, TN, NH₃-N & Heavy Metal Analyzer
Automated wet-chemistry station with self-calibrating reagent dispensing for municipal wastewater compliance and river basin surveillance.
View SpecificationsFrequently Asked Procurement & Engineering Questions
In-depth responses from BOQU electrochemical research directors addressing calibration, materials, and international delivery.
How does a TDS meter probe fundamentally differ from a standard electrical conductivity (EC) probe?
At the hardware level, a TDS meter probe is an electrochemical conductivity cell consisting of two or four precisely spaced electrodes. The physical measurement acquired is electrical conductance (measured in Siemens). However, while an EC probe outputs raw electrolytic conductance normalized to path length (µS/cm or mS/cm), a TDS probe or analyzer internally multiplies this conductivity value by an empirical scaling coefficient (\(k_e\), typically 0.50 to 0.70) to estimate total dissolved ionic mass in milligrams per liter (mg/L) or parts per million (ppm). Furthermore, high-end TDS systems apply non-linear temperature compensation curves referenced to 25°C to prevent thermal fluctuations from skewing perceived dissolved solids concentration.
Which cell constant (K-value) should be specified for pure water versus concentrated brine applications?
The cell constant \(K = d / A\) dictates the electrical field geometry between electrodes and must be paired with the expected ionic strength of the process fluid. For pure water, condensate, and reverse osmosis permeate (0.01 to 20 µS/cm, equivalent to 0.005 to 10 ppm TDS), specify a low cell constant of K = 0.01 cm-1 or K = 0.1 cm-1 to maximize electrical resistance and signal resolution. For municipal drinking water, cooling towers, and light industrial wastewater (100 to 10,000 µS/cm, 50 to 5,000 ppm TDS), specify K = 1.0 cm-1. For seawater, mining tailings, and chemical concentration baths exceeding 10,000 ppm TDS, specify K = 10.0 cm-1 or transition to an inductive electrodeless toroidal sensor to prevent measurement saturation and electrode polarization.
What causes polarization error in 2-electrode TDS sensors, and how does BOQU engineer around it?
Polarization error occurs in classical 2-electrode sensors when ions in solution migrate toward oppositely charged electrodes under an applied electric field, forming a capacitive electrical double layer (Helmholtz layer). This layer acts as an artificial boundary impedance, causing the measured conductivity to read falsely low at moderate-to-high ionic concentrations. Shanghai BOQU mitigates this phenomenon through three engineering strategies: (1) Utilizing high-frequency alternating current (AC) excitation signals rather than DC to continuously reverse polarity before ionic layers stabilize; (2) Coating platinum electrodes with high-surface-area platinum black or utilizing specialized isostatic graphite to drastically decrease current density; and (3) Deploying 4-electrode multipole geometries, where voltage-sensing pins draw near-zero current and remain completely immune to polarization resistance.
What is Shanghai BOQU's standard lead time, minimum order quantity (MOQ), and shipping flexibility for overseas OEMs?
As a vertically integrated original equipment manufacturer operating 4,632 m² of production facilities in Shanghai, BOQU maintains extensive stock of raw components, machined housings, and calibrated circuit boards. For standard catalog TDS probes and online analyzers, prototype and pilot evaluation orders carry an MOQ of just 1 unit with typical dispatch within 3 to 5 business days. Full container loads or recurring monthly OEM production runs (500 to 5,000 units) are delivered within 15 to 25 business days via sea freight (FOB Shanghai, CIF global ports) or expedited door-to-door international air express (DHL, FedEx, UPS) with complete export documentation and certificates of origin.
Can BOQU TDS probes output digital signals directly to third-party SCADA or PLC systems without a secondary transmitter?
Yes. BOQU's IOT-series digital intelligent probes integrate internal signal conditioning, analog-to-digital conversion, and micro-controller circuitry directly inside the probe encapsulation. These sensors communicate over a standard RS485 physical interface utilizing industrial Modbus RTU protocol. They can be wired directly into any standard PLC (Siemens, Allen-Bradley, Schneider), industrial gateway, or DCS terminal block over cable runs up to 1,000 meters without requiring external transmitters, reducing hardware footprint and commissioning costs by over 40%.