Direct From Assembly
Featured Industrial TDS & Electrochemical Sensors
Procure directly from Shanghai BOQU Instrument's ISO 9001/14001 production lines. Designed for long-cycle industrial endurance, minimal drift, and seamless PLC/SCADA integration.
China High-temperature pH Sensor Used Pharmaceutical Fermentation
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Wholesale High Temperature (0-130℃) pH Sensor Supplier, Factories
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Wholesale High-temperature S8 Connector pH Sensor Manufacturers
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pH5806 High-Temp Steam Sterilizable Sensor
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DOG-208FA Polarographic DO Sensor for Bioreactors
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IOT-485 Smart RS485 Modbus Digital Water Sensor
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ZDYG-2088-01QX Optical Infrared Turbidity / TSS Sensor
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Executive Whitepaper
Why Global Procurement Heads Benchmark China Factory TDS Price Lists
Understanding how integrated component supply chains, automated aging facilities, and high-precision CNC manufacturing allow Tier-1 Chinese manufacturers to eliminate brand markups while exceeding IEC performance metrics.
Vertical Supply Chain Integration
Unlike Western instrumentation brands that outsource sub-assemblies, BOQU executes electrode sintering, injection molding, PCB surface mount assembly (SMT), and CNC titanium/PTFE body machining entirely within our Lingang and Kangqiao plants. This delivers a 40–60% structural cost advantage on wholesale TDS price lists.
- In-house glass blowing & electrode bulb annealing
- Direct automated component picking & surface placement
- Zero tiered brokerage margin overhead
China's First High-Temp Lab
Our dedicated high-temperature water quality analytical laboratory subjects TDS and conductivity cells to real-time thermal shock cycles (0 to 130°C) and pressurized flow loops up to 16 bar. This eliminates field electrode delamination and zero-point calibration drift in harsh chemical processes.
- Dynamic cyclic temperature testing benches
- Steam sterilization simulation (SIP up to 135°C)
- NIST-traceable calibration buffer verification
Rigid 48-Hour Burn-In Protocol
To assure international reliability without local warranty friction, 100% of our online transmitters, dual-channel controllers, and RS485 Modbus digital sensors undergo 48 hours of uninterrupted thermal aging and multi-point standard solution verification before outbound crating.
- Full traceability records linked to serial numbers
- ISO 9001, ISO 14001, CE, SGS & FDA credentials
- Shanghai Brand certified quality governance
Procurement Reference
Industrial TDS & Conductivity Wholesale Pricing Matrix
Standard factory OEM tier-pricing bands based on measurement technology, process cell constant (K-factor), wetted materials, and order quantities.
| Instrument Class | Cell Constant / Range | Wetted Materials | Output / Protocol | MOQ Tier | Indicative Price Range (USD) |
|---|---|---|---|---|---|
| Pure Water TDS/EC Sensor Two-Electrode Contacting |
K=0.01 / 0.1 0.05–20 µS/cm |
316L Stainless Steel / PEEK / PTFE | Analog raw or direct RS485 Modbus RTU | 10 – 50 pcs Tier 1 |
$45.00 – $85.00 / unit |
| Industrial Process TDS Sensor Dual-Pin Contacting Cell |
K=1.0 1–2,000 µS/cm (TDS: 0–1,000 ppm) |
Titanium Alloy / Polysulfone / PVDF | NTC 10K / Pt1000 Temp Output | 50 – 200 pcs Tier 2 |
$35.00 – $65.00 / unit |
| High-Concentration Toroidal TDS Sensor Inductive / Electrodeless |
Wide Dynamic 200 µS/cm – 2,000 mS/cm |
Molded PEEK / Polypropylene / PFA | Isolated 4–20mA + RS485 digital output | 5 – 25 pcs Tier 1 |
$140.00 – $260.00 / unit |
| High-Temp Bioreactor pH/EC Sensor Steam Sterilizable (pH5806 Series) |
pH 0–14 / 0–130°C Withstands CIP/SIP |
Specialized Glass, Polymer Gel, PG13.5 | S8 / VP6 Connector / Coaxial | 20 – 100 pcs Tier 2 |
$55.00 – $95.00 / unit |
| Dual-Channel Online Analyzer (DCA130) Integrated Wall / Panel Mount |
Dual pH + EC/TDS input Automatic Temp Compensation |
IP65 Polycarbonate Enclosure | 2x 4–20mA, 2x Relay Alarms, Modbus RTU | 10 – 50 units Tier 1 |
$180.00 – $320.00 / unit |
* Final unit pricing is subject to custom cable length, OEM branding requirements, and regional shipping terms (FOB Shanghai / CIF).
Market Intelligence
Technological Macro Shifts in TDS & Water Analysis
How edge computing, direct IoT communications, and optical anti-fouling are redefining industrial water quality instrumentation architectures globally.
Direct-to-Cloud Modbus Nodes
The market is rapidly shifting away from dedicated, cabinet-mounted wall transmitters toward smart digital probe heads with integrated microprocessors executing local temperature compensation and RS485 transmission directly.
Inductive Toroidal Adoption
Traditional contacting electrodes experience fouling, polarization, and scaling in wastewater brine. Toroidal electrodeless sensors use magnetic induction fields, virtually eliminating routine sensor maintenance.
Edge Calibration Diagnostics
Newer smart nodes store factory cell constants and calibration curves directly on local EEPROMs inside the sensor body. Probes can be hot-swapped on the production line without taking controllers offline.
Zero Liquid Discharge (ZLD)
Global environmental mandates are forcing chemical and textile complexes to recover 95%+ of process water. High-concentration TDS monitoring is crucial to protecting reverse osmosis membrane life.
Field Implementation
Engineered Solution Blueprints Across Critical Sectors
Proven field deployments where accurate TDS and conductivity instrumentation maintain process safety and regulatory compliance.
Power Plant Boiler Feedwater (SWAS)
Thermal power plants operate high-pressure steam turbines where even trace dissolved ions cause caustic embrittlement and catastrophic blade pitting. Our dual-electrode pure water sensors guarantee sub-microSiemens measurement.
- Continuous cation and specific conductivity monitoring
- Silicate, Sodium, and Hydrazine trace limits
- Pressure and temperature reduction conditioning skids
Biopharma & Sterile Fermentation
Bio-reactors require strict osmotic equilibrium during antibiotic and enzyme synthesis. Sensors must survive 130°C SIP steam cycles without electrode glass cracking or reference fluid contamination.
- pH5806 steam-sterilizable electrode architecture
- Electrolytic bridge technology to avoid protein precipitation
- Direct integration with automated CIP/SIP wash routines
Commercial Hydroponics & AgTech
In closed-loop precision fertigation, exact electrical conductivity dictates fertilizer concentration. Over-salinity burns root tips, while under-concentration stunts crop yields.
- DCA130 dual-channel simultaneous pH & EC management
- Relay trip outputs triggering peristaltic nutrient pumps
- Extended immersion assemblies for outdoor reservoir tanks
Industrial RO Demineralization Skids
OEM system integrators building industrial water treatment skids require real-time membrane rejection rate calculation. Measuring TDS upstream and downstream of membranes warns of seal failure.
- Dual-sensor calculation of membrane salt passage percentage
- Corrosion-resistant PVDF and Titanium sensor construction
- Integrated Modbus loops feeding central SCADA monitors
High-Density Recirculating Aquaculture
Intensive fish and shrimp hatcheries face volatile dissolved solids and un-ionized ammonia buildup. Continuous TDS and DO measurement triggers freshwater flushes automatically.
- Resistant to bio-fouling and biofilm build-up
- Submersible IP68 probe heads with heavy polyurethane cables
- 24/7 telemetry alarm alerts protecting stock survival
Cooling Tower Blowdown Automation
Evaporative cooling towers accumulate dissolved mineral salts, creating heat exchanger scale. Automated blowdown valves triggered by toroidal TDS sensors conserve millions of gallons of water.
- Toroidal inductive probes unaffected by rust or scale
- Direct relay triggering of bleed valves and biocide pumps
- Substantial operational chemical and freshwater savings
Enterprise Evaluation
How Global EPCs & Wholesalers Assess Factory Viability
Procurement checklist applied by municipal engineering firms and instrumentation distributors before entering annual framework agreements.
Audited Certifications
Verification that facilities are independently verified under ISO 9001 quality systems and ISO 14001 environmental frameworks. European CE marking and RoHS compliance are compulsory for project tender submissions.
White-Label Customization
Distributors require tailored silk-screen brand printing, custom casing molds, firmware localization, and private-labeled packaging without demanding prohibitive multi-thousand unit minimum commitments.
Lead Time Stability
Supply chain security is non-negotiable. Tier-1 manufacturers maintain active raw material buffers (semiconductors, platinum wire, optical lenses) to ensure standard 5 to 10-day dispatch schedules.
Application Engineering Support
Direct pre-sale access to instrumentation engineers who evaluate process pressures, flow velocities, chemical compatibility, and installation geometries to guarantee right-first-time commissioning.
Knowledge Base
Frequently Asked Questions: TDS & Water Quality Procurement
Common inquiries from overseas procurement specialists, system builders, and plant managers.
What is the mathematical relationship between Electrical Conductivity (EC) and TDS?
Total Dissolved Solids (TDS in ppm or mg/L) is derived from Electrical Conductivity (EC in µS/cm) using an empirical conversion factor: TDS = EC × k. Depending on the ionic makeup of the water, this factor varies between 0.50 (sodium chloride dominated) and 0.70 (442 natural water standard). BOQU analyzers allow users to configure custom linear conversion factors directly from the front panel or via Modbus registers.
How does cell constant (K-factor) impact TDS sensor selection?
The cell constant defines the geometric relationship between the measurement electrodes. A low cell constant (K=0.01 or K=0.1 cm⁻¹) is required for pure and ultra-pure water (low ions) to maximize signal voltage. A standard cell constant (K=1.0 cm⁻¹) handles general tap water and wastewater up to 2,000 µS/cm, while high cell constants (K=10.0 cm⁻¹) or toroidal electrodeless coils are specified for brine and high-salinity effluent.
Is BOQU a direct manufacturer or a trading agent?
Shanghai BOQU Instrument Co., Ltd. is an authentic original equipment manufacturer established in 2007. Operating two specialized facilities in Pudong, Shanghai (Kangqiao and Lingang) covering 4,632 square meters, all sensor fabrication, circuit board design, assembly, and testing are conducted directly in-house by our 200+ employees.
Can you provide custom cable lengths and OEM housing branding?
Yes. As a factory supplier, we offer end-to-end OEM and ODM services. We routinely customize submersible cable lengths up to 100 meters, provide specialized threading (NPT, PG13.5, tri-clamp sanitary flanges), laser-etch custom brand logos on sensor bodies, and pre-program customized RS485 baud rates and slave addresses.
How do temperature fluctuations affect online TDS measurements?
Water conductivity increases approximately 2% for every 1°C increase in temperature due to increased ion mobility. BOQU sensors incorporate precision Pt1000 or NTC 10K resistance temperature detectors (RTDs) directly within the probe tip, enabling real-time Automatic Temperature Compensation (ATC) referenced to standard 25°C conditions.
What is the standard delivery timeline for bulk factory orders?
Standard catalog sensors and digital analyzers are routinely maintained in semi-assembled buffer stock, allowing sample shipments within 48 to 72 hours. Bulk wholesale orders (50 to 500 units) are typically manufactured, 48-hour burn-in tested, calibrated, and packed for air or ocean freight within 10 to 14 business days from order confirmation.
Integrated Solutions
Industrial Analyzers & Multi-Parameter Transmitters
Complete your monitoring loops with rugged process analyzers, dual-channel controllers, and continuous compliance monitors.
China High Temperature (0-130℃) pH Sensor With Temperature
View Product
China High-temperature pH Sensor Used Pharmaceutical Fermentation
View Product
Wholesale High Temperature (0-130℃) pH Sensor Supplier, Factories
View Product
Wholesale High-temperature S8 Connector pH Sensor Manufacturers
View Product
DCA130 Online Dual Channel pH & Conductivity Analyzer
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MPG-6099Plus Integrated Multi-parameter Water Station
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pHG-2081Pro Industrial Wall-Mounted pH/ORP Analyzer
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