Calibrated in-house, pre-aged for 48 continuous hours, and compliant with ISO 9001 and CE frameworks. Choose standardized models or configure custom electrode cell constants (K=0.01 to K=10.0).
Sterilizable
Engineered to endure repeated SIP/CIP steam cycles without signal drift. Ideal for complex fermentation vessels requiring real-time pH and ionic concentration monitoring.
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0-130℃ Rated
Featuring specialized polymeric gel electrolyte systems and high-pressure ceramic diaphragms designed for severe thermal conditions up to 130°C.
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Dual Integrated
Integrated Pt1000/Pt100 temperature element ensuring automated thermal compensation for precise TDS/EC and pH slope stabilization across extreme gradients.
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S8 PG13.5
Standardized PG13.5 thread and S8/VP plug interface, allowing straightforward mechanical retrofitting into bioreactor ports, flow cells, and pipeline housings.
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Shanghai Brand
Certified Shanghai Brand sensor engineered specifically for biopharma fermenters, chemical synthesis, and repeated clean-in-place applications.
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Polarographic DO
Polarographic dissolved oxygen probe designed to operate seamlessly alongside TDS/EC probes in aerobic cultures and high-temperature process pipelines.
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RS485 Modbus
Smart digital sensor transmitting calibrated RS485 Modbus RTU telemetry directly to PLCs, Edge Gateways, or SCADA cloud systems without an external transmitter.
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Optical / Self-Clean
Infrared scattered light probe paired with self-cleaning wipers to deliver stable TSS & turbidity readings in municipal effluents and high-solids water loops.
Explore SpecificationUnderstanding the electrochemical measurement principles of electrolytic conductivity and TDS conversion for industrial liquid analysis.
TDS is derived mathematically from Electrical Conductivity (EC) using specialized conversion coefficients (typically 0.50 to 0.70 mg/L per µS/cm). High-end wholesale TDS probes feature precision-machined titanium, 316L stainless steel, or platinum-black electrode arrays to suppress polarization capacitance, ensuring linear response profiles across ppm, ppt, and µS/cm metrics.
Directing probe performance across varied liquid matrices requires tailored geometry. K=0.01 to 0.1 probes offer supreme sensitivity for ultra-pure water (UPW) and reverse osmosis permeate loops; K=1.0 serves drinking and industrial water; while inductive toroidal or heavy-duty K=10.0 sensors eliminate polarization errors in brine, cooling towers, and aggressive chemical streams.
Ionic conductivity shifts approximately 1.8% to 2.2% per degree Celsius. BOQU factory-grade TDS probes embed rapid-response PT1000 or NTC thermal sensors within the electrode tip. Digital microcontrollers apply rigorous non-linear compensation algorithms conforming to ISO 7888 and DIN 38404 standards for drift-free operational integrity.
Headquartered in Shanghai, BOQU operates two specialized facilities spanning 4,632 m² of lean production floorspace, integrating raw-material machining, sensor micro-welding, and automated calibration.
By conducting CNC machining of stainless steel sleeves, high-purity glass blowing, SMT electronics assembly, and cable overmolding internally, we eliminate tiered middleman markups and reduce bulk B2B procurement costs by 30-45% compared to Western branded equivalents.
Every single TDS sensor and water analyzer leaving our Kangqiao and Lingang workshops undergoes 48 hours of continuous dynamic aging, multi-point standard solution calibration (NIST traceable), and hydrostatic pressure leak testing up to 1.6 MPa (16 bar).
Our dedicated engineering department facilitates custom laser etching, customized cable pinouts (VP, S8, bare wire), specialized insertion lengths (120mm, 225mm, 325mm, 425mm), and custom Modbus register configurations within a 10-14 day production cycle.
Match your process media parameters with optimal electrode metallurgy, cell factor, and communication interfaces.
| Application Sector | Target TDS / EC Range | Optimal Cell Constant | Recommended Electrode Material | Interface / Output Protocol |
|---|---|---|---|---|
| Semiconductor & UPW | 0.001 – 10.00 ppm (0.055 – 20 µS/cm) | K = 0.01 / 0.1 | 316L Stainless / Electropolished Titanium | Digital RS485 Modbus RTU / Isolated 4-20mA |
| Commercial RO & Desalination | 10 – 5,000 ppm (20 – 10,000 µS/cm) | K = 1.0 | Platinized Platinum / Industrial Graphite | Direct Analog 4-20mA / Modbus RTU |
| Hydroponics & Agriculture | 50 – 3,000 ppm (100 – 6,000 µS/cm) | K = 1.0 | Platinum Black / Rugged PPS Body | Standard mV or Integrated RS485 |
| Thermal Power SWAS Steam Loops | 0.01 – 50 ppm (Cation Cond. < 0.2 µS/cm) | K = 0.01 | Titanium Alloy / High-temp PEEK | SWAS Rack Dedicated Transmitter Signal |
| Wastewater & Brine Recovery | 1,000 – 50,000+ ppm (> 20,000 µS/cm) | K = 10.0 / Toroidal | Toroidal Inductive (Non-contact PEEK/PVDF) | RS485 Modbus RTU / HART / Relay Alarms |
From centralized SCADA integration to remote solar-powered IoT monitoring networks across global operations.
Traditional setups requiring a probe connected to an expensive standalone wall-mount transmitter are giving way to digital RS485 Modbus smart probes. Integrated micro-PCBs inside the probe head digitize readings locally, permitting multi-drop bus architectures with 32+ sensors linked over 1,000 meters straight to PLCs.
Intensive indoor fish and shrimp farming demands continuous TDS, salinity, and DO monitoring to optimize metabolic rates and feed conversion ratios. Wholesale operators in Southeast Asia, Korea, and Latin America utilize our multiplexed probes for autonomous automated salinity dosing and aeration triggering.
Stringent industrial discharge permits across North America and the EU mandate continuous brine concentration and TDS verification before and after mechanical vapor recompression (MVR) systems. Toroidal inductive TDS sensors prevent severe scale buildup, avoiding unscheduled facility shutdowns.
Complete documentation packages provided with wholesale orders to ensure frictionless customs clearance and plant auditing.
Our complete operational apparatus operates under certified management systems. Every manufacturing batch retains full traceability from raw alloy ingot certificates to final electrochemical factory calibration data records.
Equipped with internal optoelectronic isolation and TVS surge suppression, BOQU instruments comply fully with European CE directives (EN 61326-1 industrial EMC) and hazardous substance constraints under RoHS regulations.
For food, beverage, and pharmaceutical fermentation installations, wetted materials including 316L SS, USP Class VI silicone gaskets, and medical-grade PEEK components comply with FDA guidelines and 3-A sanitary standards.
Clear, direct answers for instrumentation engineers, procurement executives, and system integrators.
A standard 2-electrode probe is ideal for clean, low-to-medium TDS solutions (such as RO water or clean tap water) where polarization errors are minimal. 4-electrode probes utilize separate current-injecting and voltage-sensing circuits, significantly widening the linear dynamic range and resisting light fouling. Inductive (toroidal) probes utilize non-contact magnetic coils encased in PEEK or PVDF, making them virtually maintenance-free for high-TDS brines, oily media, and aggressive chemical solutions where metallic electrodes corrode or polarize instantly.
Yes. As a primary manufacturer, we support end-to-end OEM and ODM services. We produce custom cell constants (K=0.01, 0.1, 1.0, 10.0), custom cable lengths up to 100 meters, specialized wetted materials (Titanium, Hastelloy, 316L), custom thread dimensions (NPT 1/2", 3/4", PG13.5), and private branding featuring your corporate logo via high-resolution fiber laser marking.
Conductivity increases by roughly 2% for each 1°C increase in temperature due to decreased fluid viscosity and enhanced ion velocity. Without automatic temperature compensation (ATC), process temperature swings will cause massive apparent fluctuations in reported TDS. BOQU sensors integrate PT100, PT1000, or NTC temperature sensors directly adjacent to the electrode tips, enabling our controllers and smart RS485 probes to apply precise linear or matrix temperature compensation referenced to 25°C standard base temperature.
Standard catalog sensors and analyzers maintain an inventory buffer with dispatch availability within 3 to 5 business days. Customized OEM batch orders typically require a 10 to 15-day manufacturing cycle. Our minimum order quantities are designed to support growing engineering partners: sample units are available without MOQ constraints, while discounted tiered container-level pricing begins at 50 to 500-unit tiers.
Every shipment comes accompanied by ISO 9001 factory inspection certificates, individualized NIST-traceable calibration reports detailing zero point offset and slope calibration metrics, CE declaration documents, and comprehensive pinout/Modbus register documentation in English. 3.1 material certificates can be provided upon request for high-pressure stainless components.
Engineered to work seamlessly alongside our wholesale TDS probe range for complete plant-wide process telemetry and regulatory compliance.
Dual Channel
Simultaneously monitors pH, Electrical Conductivity, and TDS on a single industrial controller with dual 4-20mA and relay alarm outputs.
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Integrated Panel
Turnkey pre-piped panel combining TDS, EC, pH, residual chlorine, and turbidity with integrated flow cell for drinking water distribution stations.
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IP65 Wall Mount
Heavy-duty transmitter engineered for closed-loop dosing in wastewater treatment, chemical neutralization, and industrial cooling towers.
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Toroidal Conc.
High-range inductive conductivity analyzer measuring HNO3, H2SO4, and NaOH concentrations for CIP lines and chemical manufacturing.
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Amperometric
Continuous free chlorine disinfection measurement without reagent consumption, featuring automatic temperature and pH compensation.
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SWAS Trace
Trace ppb-level colorimetric analyzer protecting thermal turbine blades and high-pressure steam boilers against catastrophic silica deposition.
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Pharma Grade
UV persulfate oxidation method engineered for pharmacopoeia compliance in purified water (PW) and water for injection (WFI) loops.
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Discharge Audit
Automated wet-chemistry system providing autonomous self-cleaning, scheduled standard recalibrations, and official EPA-grade data logging.
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