Featured Industrial Water Sensors & Transmitters
Direct factory supply of high-temperature pH, ORP, DO, Turbidity, and digital conductivity sensors for harsh industrial environments.
China High Temperature (0-130℃) pH Sensor With Temperature Wholesaler
Specialized steam-sterilizable glass formulation designed for continuous bioprocessing and fermentation monitoring.
Wholesale High Temperature (0-130℃) pH Sensor Supplier, Factories
High-pressure gel-filled double junction reference electrode preventing poisoning in heavy chemical baths.
Wholesale High-temperature S8 Connector pH Sensor Manufacturers, Factory
Universal standard S8 threaded connection head with IP68 waterproof design for fast plug-and-play assembly.
China High-temperature pH Sensor Used Pharmaceutical Fermentation Wholesaler
Meets strict hygienic standards for antibiotic synthesis, vaccine incubation, and cellular culture vessels.
pH5806 Flagship High-Temperature Sterilizable pH Sensor
Certified Shanghai Brand industrial electrode surviving repeated CIP/SIP steam sterilization cycles without drift.
DOG-208FA High Temperature Dissolved Oxygen Sensor
Polarographic DO electrode with precision nano-permeable membrane for biological aeration and oxygen uptake rate assays.
IOT-485-pH & TDS Digital Online Smart Probe
Embedded micro-transmitter supporting RS485 Modbus RTU directly to PLC, DCS, SCADA, or cloud edge gateways.
ZDYG-2088-01QX Infrared Turbidity & TSS Sensor
90-degree scattered infrared light absorption technology with mechanical wiper system for zero-maintenance operation.
Scale, Consistency & Supply Chain Resilience
Direct from China's premier analytical instrument manufacturing cluster in Shanghai Pudong.
Industrial TDS Sensor Engineering & Global Metrology Standards
An analytical engineering review on conductance-to-TDS conversion, electrode electrochemistry, and telemetry architecture.
1. Metrological Principles: Conductance, Cell Constants & The TDS Conversion Multiplier
In modern analytical process chemistry, Total Dissolved Solids (TDS) refers to the cumulative concentration of inorganic minerals, organic salts, and heavy cations/anions dissolved in water, expressed in parts per million (ppm) or milligrams per liter (mg/L). Because direct gravimetric analysis (evaporation to dryness followed by oven dehydration at 180°C) is technically impossible in continuous online processes, industrial TDS sensors measure Electrical Conductivity (EC) and convert the resulting ionic conductivity via empirical mathematical calibration factors.
The governing equation correlates specific conductance ($\kappa$ in μS/cm or mS/cm) to TDS:
TDS (ppm) = κ (μS/cm) × k_e
Where k_e represents the ionic conversion factor. In standard potable water systems dominated by calcium bicarbonate, a conversion constant of 0.64 to 0.67 is standard (often mapped to the 442 Natural Water standard). In ultra-pure boiler feed and semiconductor rinsing circuits, a conversion factor of 0.50 to 0.55 (pure sodium chloride equivalence) is selected, whereas in agricultural fertilizer dosing and hydroculture, standard industry controllers apply a 0.70 factor (often matching potassium chloride formulations).
Critical to high-precision online measurement is the physical Cell Constant ($K$), defined as the ratio of distance ($d$) between sensing electrodes to their effective cross-sectional area ($A$):
K = d / A (expressed in cm&sup-1;)
China Factory 4.0 production at Shanghai BOQU strictly isolates cell geometries into distinct metrological classes:
- K = 0.01 cm⁻¹: Ultra-trace boiler condensate and semiconductor UPW (0.001 to 20 ppm TDS / 0.055 to 20 μS/cm).
- K = 0.1 cm⁻¹: Reverse osmosis (RO) permeate and demineralized loops (0.5 to 200 ppm TDS / 1 to 400 μS/cm).
- K = 1.0 cm⁻¹: General municipal potable water, cooling towers, and light industrial runoff (10 to 2,000 ppm TDS / 20 to 4,000 μS/cm).
- K = 10.0 cm⁻¹ or Toroidal Inductive: High-salinity chemical brines, ocean desalination intake, and acid/base CIP monitoring (up to 100,000 ppm TDS / 200 mS/cm).
2. Industry 4.0 Technology Shifts: Smart Digital Probes vs. Legacy Analog Loops
The water sensor manufacturing sector is undergoing an aggressive structural shift. Traditional 2-wire analog sensors (transmitting high-impedance raw millivolt signals across long shielded cables) suffer severe signal degradation, ground loops, and electromagnetic interference from neighboring variable-frequency drives (VFDs) and high-load industrial pumps.
The IoT Smart Probe Evolution: BOQU's next-generation digital TDS probes integrate a high-speed ARM Cortex-M micro-controller directly inside the sensor housing. Analog-to-digital signal conversion occurs millimeters from the platinum or titanium pins. The sensor stores its own multi-point calibration curves, cell constant drift logs, and dynamic Nernst/linear temperature compensation models in onboard EEPROM. Direct digital communication via RS485 Modbus-RTU enables transmission distances up to 1,200 meters without signal loss, integrating effortlessly with modern PLC frameworks, DCS networks, or low-power wireless edge gateways (LoRaWAN, 4G-LTE Cat-M1, NB-IoT).
3. China Factory 4.0: Supply Chain Agility, Vertical Integration & Cost Superiority
The global analytical instrumentation supply chain previously faced acute delivery bottlenecks and heavy price markups from legacy Western European and North American instrumentation brands. Shanghai BOQU Instrument's dual-manufacturing base in Kangqiao and Lingang showcases modern China Factory 4.0 superiority:
- Total In-House Fabrication: From precision glass blowing and automated titanium CNC turning to surface-mount technology (SMT) PCB assembly and environmental chamber aging, all critical components are manufactured under ISO 9001 control.
- Pre-Shipment Stress Testing: Every commercial sensor undergoes continuous 48-hour thermal aging and calibration verification against certified NIST-traceable conductivity standards before dispatch.
- Supply Chain Cost Efficiency: Complete vertical integration delivers 40% to 60% procurement CAPEX savings for international EPCs, municipal contractors, and OEM machine builders without sacrificing sensor operational lifespan (Mean Time Between Failures > 36,000 continuous hours).
Industrial TDS Sensor Wholesale Price & Specification Matrix
Transparent FOB Shanghai wholesale price benchmarks for global system integrators, distributors, and engineering contractors.
| Model / Sensor Class | Cell Constant (K) | TDS Range (ppm) | Wetted Materials | Signal Output | MOQ | FOB Shanghai (1-50 pcs) | Volume OEM (>200 pcs) | Availability |
|---|---|---|---|---|---|---|---|---|
| TDS-100 Standard RO Probe | K = 1.0 cm⁻¹ | 0 - 2,000 ppm | 316L Stainless Steel / ABS | Analog 2-Wire / S8 | 10 pcs | $16.50 - $22.00 | $11.80 | In Stock (3 Days) |
| TDS-200 Pure Water Probe | K = 0.01 / 0.1 cm⁻¹ | 0.01 - 200 ppm | Grade 1 Titanium / PTFE | Analog PT1000 ATC | 5 pcs | $42.00 - $58.00 | $33.50 | In Stock (5 Days) |
| IOT-TDS-485 Smart Digital Probe | K = 1.0 cm⁻¹ | 0 - 5,000 ppm | 316L SS / Titanium / POM | RS485 Modbus-RTU | 5 pcs | $68.00 - $85.00 | $49.00 | In Stock (3 Days) |
| HT-TDS-500 High-Temp Sterilizable | K = 0.1 / 1.0 cm⁻¹ | 0 - 10,000 ppm | Electropolished 316L / PEEK | High-temp coaxial / PG13.5 | 2 pcs | $115.00 - $145.00 | $88.00 | Stock / 10 Days |
| TOR-800 Toroidal Inductive Probe | Electrodeless | 100 - 500,000 ppm | Virgin PFA / PVDF | 4-20mA + RS485 Dual | 1 pc | $280.00 - $360.00 | $215.00 | Build to Order (2 Wks) |
| DCA130 Dual Channel Transmitter | N/A (Controller) | Multi-range auto | IP65 Wall / Panel Mount | 2x 4-20mA, 2x Relays, RS485 | 1 pc | $195.00 - $240.00 | $148.00 | In Stock (3 Days) |
* Note: Prices reflect standardized configurations. Custom cable lengths (up to 50m), titanium or Hastelloy-C electrodes, specialized sanitary Triclamp fittings, private OEM labeling, and custom baud rate/register configurations are quoted on request by BOQU project application engineers.
Localized Applications Across Strategic Sectors
Engineered to meet national environmental standards and high-reliability industrial infrastructure globally.
Industrial Reverse Osmosis (RO)
Hydroponics & Commercial CEA
Cooling Towers & Boiler Blowdown
Zero Liquid Discharge (ZLD) Effluent
Pharmaceutical Purified Water (WFI)
Municipal Potable Water Networks
How to Select & Calibrate Industrial TDS Sensors
A systematic methodology for instrumentation engineers to optimize sensor longevity and measurement accuracy.
Step 1: Match Geometry to Water Range
Selecting an incorrect cell constant produces severe measurement saturation or low signal-to-noise ratio. Never specify K=1.0 cm⁻¹ for ultra-pure boiler water; the low ion density requires K=0.01 cm⁻¹ with titanium electrodes to establish readable AC resistance without polarization artifacts.
Step 2: Thermal Drift & ATC Compensation
Aqueous conductivity shifts roughly 2.0% per degree Celsius. Reliable TDS determination requires integrated Class-A Pt100 or Pt1000 RTD sensors placed in direct contact with the process fluid. For pure water, standard linear 2%/°C algorithms must be replaced with non-linear neutral water ionization models.
Step 3: Multi-Point Traceable Calibration
Avoid single-point deionized water zero calibrations due to atmospheric carbon dioxide dissolution. Utilize certified KCl primary reference standards (84 μS/cm, 1413 μS/cm, or 12.88 mS/cm). Clean sensing tips with mild 5% sulfamic acid prior to calibration to strip mineral scale deposits.
Questions Global B2B Buyers Ask Before Ordering
Definitive technical and commercial answers directly from the BOQU export engineering team.
Is BOQU an original equipment manufacturer (OEM) or an export trading company?
What is the difference between an EC (Conductivity) sensor and a TDS sensor?
Can BOQU smart sensors interface directly with third-party PLCs without a transmitter?
What custom OEM and private labeling services does the factory support?
Which international testing and quality certifications do BOQU instruments possess?
What lead times and delivery mechanisms are available for international orders?
Industrial Analyzers, Dual-Channel Controllers & SWAS Systems
Complete analytical panels and high-precision wet chemistry analyzers for comprehensive plant-wide compliance.
DCA130 Online pH & EC / TDS Dual Channel Analyzer
Compact dual-parameter transmitter monitoring pH and conductivity concurrently on an illuminated matrix screen.
MPG-6099Plus Multi-Parameter Monitoring Panel
Turnkey wall-mount system integrating TDS, turbidity, residual chlorine, pH, and dissolved oxygen with integrated flow chamber.
pHG-2081Pro Industrial Water Quality Controller
Heavy-duty IP65 instrument housing with programmable dual relay alarm controls for precise chemical neutralization dosing.
SJG-2083CS Online Acid & Alkali Concentration Meter
Electrodeless inductive toroidal technology delivering direct percentage concentration readouts for HCl, NaOH, and H2SO4.
Online Residual Chlorine Analyzer with Constant Voltage Cell
Reagentless amperometric free chlorine detection with automatic temperature and pH cross-compensation for water utilities.
Online Trace Silicate, Phosphate & Sodium SWAS Analyzer
Sub-ppb detection limit colorimetric analyzer protecting thermal boiler systems and steam turbines from catastrophic scaling.
TOC-3042 Online Total Organic Carbon Analyzer
680°C catalytic combustion oxidation with NDIR detection for pharmaceutical water-for-injection and surface runoff tracking.
Online COD, TP, TN, NH3-N Automated Effluent Analyzer
Automated wet-chemical digestion analyzer engineered for industrial park discharge compliance with self-cleaning fluidics.
Accelerate Your Project With Direct Tier-1 Manufacturer Support
Send your process water specifications, ionic range, expected temperature, operating pressure, and communication architecture to receive a customized quotation and engineering drawing within 24 hours.