Top-Tier Inline Process Sensors & Industrial Analyzers
Manufactured by Shanghai BOQU Instrument in Kangqiao & Lingang smart production centers. Pre-calibrated, 48-hour burn-in aged, and field-tested for mission-critical industrial loops.
High-Temperature Fermentation pH Sensor
Designed for pressurized biopharma bioreactors, SIP/CIP cycles up to 130°C, and pressurized solid polymer electrolytes.
S8 Connector High-Temp pH Sensor
Standardized laboratory and skid mounting with Swiss-standard S8 screw head, resistant to high electrolytic salinity.
High Temperature (0–130℃) pH Sensor
Heavy-duty glass membrane electrode engineered for chemical reaction kettles and continuous steam sterilization lines.
High Temp pH Sensor with Temp Probe
Integrated platinum resistance sensor providing automatic Nernst slope temperature compensation across dynamic gradients.
pH5806 Industrial High-Temp Sensor
Winner of the Shanghai Brand award; precision electrochemical cell tailored for sterile bioprocess pipelines and fermenters.
DOG-208FA High-Temp DO Sensor
Polarographic micro-cathode dissolved oxygen electrode engineered for aerobic biological synthesis and autoclave tolerance.
IOT-485-pH Digital Smart Sensor
Transmitter-less direct bus architecture. Internal MCU outputs calibrated RS485 Modbus RTU telemetry to PLC/SCADA systems.
ZDYG-2088-01QX Turbidity & TSS Sensor
860 nm infrared ISO 7027 nephelometric backscatter sensor equipped with mechanical wiper for heavy industrial slurries.
Inline Conductivity Measurement: Global Industrial Landscape & Physics
In automated process chemistry, electrolytic conductivity ($\kappa$) serves as the primary non-destructive surrogate parameter for ionic purity, chemical concentration, and phase boundary detection.
The Metrological Mechanism
Unlike metallic conductors governed by electron drift, liquid conductivity depends on ion mobility ($u_i$), charge valence ($z_i$), and concentration ($c_i$). Specific conductance is defined by Ohm's Law: $\kappa = G \cdot K$, where $G$ is measured conductance ($1/R$) and $K$ represents the cell constant ($L/A$, cm⁻¹). For high-purity systems ($<0.055\ \mu\text{S/cm}$), intrinsic dissociation ($H_2O \rightleftharpoons H^+ + OH^-$) creates non-linear temperature dependencies, demanding dedicated matrix compensation.
Contacting vs. Toroidal Induction
Contacting 2-electrode or 4-pole electrodes interface directly with process fluids, delivering sub-ppb sensitivity ideal for USP <645> Water for Injection ($K=0.01\text{ to }0.1\text{ cm}^{-1}$). In contrast, Toroidal (Inductive/Electrodeless) meters utilize two wire-wound toroids encapsulated within PEEK or PVDF. One coil induces an alternating magnetic flux; the surrounding ionic medium acts as a coupling loop, inducing current in the pick-up coil, completely immune to electrode fouling and aggressive acids.
Temperature Compensation (NTC/PT1000)
Ion velocity increases by approximately 2% to 3% per degree Celsius. Reliable inline analyzers rely on high-precision internal thermistors (PT100, PT1000, NTC 10K). Advanced controllers provide dual-slope linear algorithms ($\alpha$-coefficients from 0.00% to 10.00%/°C) alongside ultra-pure water non-linear algorithms conforming to ASTM D1125 and DIN EN 27888 to ensure true 25°C normalized reference readings.
Cell Constant ($K$) Selection & Process Fit Guidelines
Selecting the incorrect cell constant induces severe measurement compression or saturation. Use the following design rules verified by BOQU application engineers.
| Cell Constant ($K$) | Dynamic Measuring Range | Sensor Geometry & Material | Typical Industrial Deployment | Calibration Standard Target |
|---|---|---|---|---|
| K = 0.01 cm⁻¹ | 0.001 to 20.00 μS/cm (18.2 MΩ·cm) | Concentric 316L / Titanium grade 2 | Semiconductor UPW, Power Plant SWAS Condensate, RO Permeate | ASTM D5391 On-line Pure Water Standard |
| K = 0.1 cm⁻¹ | 0.1 to 200.0 μS/cm | Coaxial Stainless Steel / Platinum Black | Pharmaceutical Purified Water (PW), WFI loops, Demineralized Water | 84 μS/cm KCl reference standard |
| K = 1.0 cm⁻¹ | 10 to 2,000 μS/cm | Graphite, 316L, Hastelloy C-276 | Municipal Drinking Water, Cooling Tower Blowdown, Aquaculture RAS | 1,413 μS/cm KCl reference standard |
| K = 10.0 cm⁻¹ | 100 μS/cm to 200,000 μS/cm | Dual-Ring Platinum or 4-Pole Carbon | Industrial Effluent, Brackish Water, Seawater Desalination Intake | 12.88 mS/cm KCl calibration solution |
| Toroidal (Inductive) | 100 μS/cm to 2,000 mS/cm (0-100% conc.) | PEEK / PFA / PVDF Hermetic Molded Core | Clean-In-Place (CIP) 3-5% NaOH/HNO₃, Acid Leaching, Brine Evaporators | Loop Resistance Shunt / 111.8 mS/cm standard |
OEM/ODM Engineering Capabilities & Verification
Shanghai BOQU Instrument Co., Ltd. operates two state-of-the-art facilities in Kangqiao and Lingang Free Trade Zone, Shanghai, integrating electrochemical core fabrication, SMT assembly, and accredited metrological calibration.
2025–2026 Factory-Direct Inline Conductivity Meter Pricelist
Benchmark your procurement expenditures. Indicative FOB Shanghai wholesale pricing for distributors, OEMs, skids manufacturers, and turnkey EPC contractors.
| Equipment Category | Primary Technical Specifications | Single Unit Sample | Batch (10–49 Units) | OEM Volume (50+ Units) | Standard Lead Time |
|---|---|---|---|---|---|
| Digital Smart RS485 Conductivity Sensor | Direct Modbus RTU, 24VDC, 316L body, $K=0.01, 0.1, 1.0$, IP68 waterproof, internal calibration storage. | $140 – $190 | $95 – $130 | $65 – $88 | 3 – 5 Work Days |
| Industrial Contacting Transmitter + Sensor Set | Wall/Panel mount transmitter, dual 4-20mA, dual SPDT relays, RS485 Modbus, coupled with 316L cell. | $280 – $380 | $210 – $260 | $160 – $195 | 5 – 7 Work Days |
| Toroidal (Inductive) Concentration Analyzer | SJG-2083CS series, PEEK/PFA electrodeless sensor, 0-2,000 mS/cm, percent acid/alkali curve mapping, CIP resistant. | $580 – $750 | $430 – $520 | $340 – $410 | 7 – 10 Work Days |
| High-Pressure SWAS Boiler Conductivity Cell | Titanium/316Ti electrodes, 100°C / 1.6 MPa rated, flow-through 304 chamber, $K=0.01$ constant for trace purity. | $220 – $310 | $160 – $220 | $120 – $155 | 5 – 8 Work Days |
| Dual-Channel Multi-Parameter Controller (DCA130) | Simultaneous pH & Electrical Conductivity (EC) inputs, graphic LCD, isolated digital telemetry, PID dosing loops. | $350 – $460 | $260 – $330 | $195 – $240 | 5 – 7 Work Days |
| Sanitary Tri-Clamp Pharmaceutical Sensor | 1.5" or 2" Tri-clamp, Ra < 0.4 μm electropolished surface, USP <645> compliant, 3.1 material certs. | $290 – $390 | $210 – $280 | $155 – $190 | 5 – 8 Work Days |
*Notes: Prices quoted in USD, FOB Shanghai Port. Custom OEM cable lengths (standard 5m or 10m), special wetted alloys (Hastelloy C276, Titanium), and customer-branded firmware available on request.
Field-Engineered Industry Deployments
How inline conductivity analyzers integrate into complex distributed process architectures across vital modern production sectors.
Biopharma & USP <645> Compliance
Purified Water (PW) and Water for Injection (WFI) loop systems require non-temperature compensated raw conductivity measurements cross-referenced with fluid temperature tables to validate compliance (Stage 1 validation). BOQU transmitters feature built-in USP <645> algorithms, calculating uncompensated ionic activity while logging 21 CFR Part 11 compliant operational data for FDA inspections.
Thermal & Nuclear Power SWAS
Steam and Water Analysis Systems (SWAS) monitor boiler feed lines to prevent turbine blade corrosion. Inline conductivity is monitored in three forms: Specific Conductivity (SC), Cation Conductivity (CC, following strongly acidic cation exchanger resin columns), and Degassed Cation Conductivity (DCC). BOQU cells ($K=0.01$) detect sub-ppb sodium and chloride intrusions with high temporal fidelity.
Automated Food & Beverage CIP Systems
Clean-in-Place systems in dairies, breweries, and beverage facilities cycle between caustic wash (NaOH), acid sanitize ($HNO_3$), and rinse water. Toroidal conductivity meters accurately identify phase transitions in milliseconds, commanding divert valves to recycle valuable cleaning chemicals rather than dumping them down the drain, reducing effluent treatment surcharges.
Technology Roadmap: Next-Gen Inline Metrology (2025–2030)
The progression from simple analog mV/frequency transmitters to smart, edge-computing cyber-physical sensory nodes.
Edge-Computing Microchips
Next-generation sensors integrate ARM Cortex-M4 processors inside the sensor head. The sensor digitizes analog excitation signals immediately adjacent to the electrodes, eliminating cable capacitance drift across long distances (>100 meters) and storing factory calibration curves directly in non-volatile sensor memory.
Predictive Fouling Diagnostics
By analyzing secondary harmonics and high-frequency impedance spectroscopy (EIS), upcoming analyzers identify biofilm growth, mineral scaling, and coating layers before measurement accuracy degrades, generating proactive automated cleaning alerts over MQTT / Industrial IoT channels.
Wireless & Battery-Less Nodes
Self-powered inline sensors energized by fluid pipe vibrations and thermochemical differentials using energy harvesting. These nodes transmit real-time conductivity and temperature data via Bluetooth Low Energy 5.3 and LoRaWAN directly to cloud-native asset management systems.
Complete Inline Water Quality & Chemical Process Instrumentation
Comprehensive system solutions complementing conductivity metrology, from dual-channel transmitters to trace power plant wet-chemistry monitoring.
DCA130 Online pH & EC Dual Channel Analyzer
Monitors pH and electrical conductivity on a single display. Ideal for hydroponics, RO feed loops, and cooling tower dosing.
MPG-6099Plus Multi-Parameter Skid Panel
Integrates conductivity, pH, turbidity, residual chlorine, and temperature telemetry for municipal drinking distribution.
pHG-2081Pro Industrial Online pH Transmitter
Rugged panel transmitter with 4–20 mA output, RS485 communication, and dual relays for automatic chemical neutralization.
SJG-2083CS Inductive Concentration Meter
Toroidal conductivity sensor tailored for chemical dosing, measuring 0-10% HCl, NaOH, $H_2SO_4$, and $HNO_3$ direct weight concentration.
Online Residual Free Chlorine Analyzer
Continuous amperometric membrane sensor for real-time chlorine disinfectant monitoring in drinking water and cooling towers.
SWAS Trace Silicate / Phosphate Analyzer
High-sensitivity colorimetric wet-chemistry analyzer guarding high-pressure thermal boilers against turbine silica deposition.
TOC-3042 Online Total Organic Carbon Analyzer
Utilizes differential conductivity metrology before and after UV catalytic oxidation for pure and pharmaceutical water validation.
Online COD / TP / TN / NH₃-N Analyzer
Automated digestion wet-chemistry spectrophotometer delivering legal environmental compliance logging at industrial discharge outfalls.
Engineering Questions Overseas Buyers Ask BOQU
Comprehensive, deep-dive answers direct from our senior instrumentation engineers and export operations group.
How do I determine whether my application requires a contacting sensor or a toroidal (inductive) conductivity sensor?
The dividing factor is ionic conductivity and fouling potential. For low-conductivity fluids below 200 μS/cm (such as pure water, demineralized water, and pharmaceutical WFI), contacting sensors with cell constants $K=0.01$ or $K=0.1$ cm⁻¹ are mandatory to achieve accurate nano-Siemens resolution. Contacting sensors cannot be used in high-solids or corrosive media because polarization resistance and chemical coating foul the electrodes.
For high-conductivity solutions (>1,000 μS/cm to 2,000 mS/cm), high-viscosity slurries, wastewater streams, and chemical concentrations (3-5% NaOH, 2-10% $H_2SO_4$), inductive (toroidal) electrodeless sensors such as the BOQU SJG-2083CS are the engineering choice. Toroidal sensors are encapsulated in solid PEEK, PVDF, or PFA with zero metal-wetted contact, making them completely immune to fouling, polarization, and harsh acid degradation.
What is cell constant drift and how frequently should inline conductivity sensors be calibrated?
Cell constant ($K = L/A$) drift happens when electrode surfaces undergo mechanical deformation, particulate abrasion, scale precipitation, or organic biofilm buildup, changing the effective geometry and electric field distribution. In clean, continuous pure water loops, BOQU 316L or titanium sensors demonstrate high mechanical stability, retaining calibration for 12 to 24 months.
In wastewater, cooling towers, or biological reactors, we recommend a 30 to 90-day inspection cycle. Toroidal sensors virtually never experience physical cell drift because their geometry is fixed inside molded high-performance thermoplastics; their calibration check primarily involves zero-offset air verification and single-point loop verification.
How does cable length impact measurement accuracy in contacting conductivity meters?
In analog contacting sensors, long cables introduce parasitic resistance and shunt capacitance ($C_{cable}$), dampening the high-frequency AC excitation current. At low conductivities ($<1\ \mu\text{S/cm}$), excessive cable length leads to significant artificial loss of signal resolution. Standard analog sensors should be restricted to cable runs of 10 to 15 meters max.
For installations requiring long transmission paths (e.g., tank farms or wide municipal plants), BOQU recommends our IOT-485 Digital Smart Sensor series. Digital sensors convert conductivity directly within the sensor body and transmit standard RS485 Modbus RTU signals over standard shielded twisted pair up to 1,200 meters without measurement degradation.
Can BOQU provide custom OEM/ODM branding, private labeling, and custom communication protocols?
Yes. Approximately 40% of BOQU's output supports global OEM and system integrator clients. OEM services include laser-marking customer logos on wetted sensor housings, private-labeled LCD transmitter overlays, custom enclosure color schemes, custom mounting threads (NPT, BSP, Tri-Clamp, Flange), specialized cable lengths up to 50 meters, and customer-specified Modbus register maps or HART protocol firmware.
What quality validation and factory acceptance tests (FAT) are conducted prior to shipment?
Every single instrument undergoes a strict 48-hour continuous burn-in environmental test under alternating thermal stress in our Kangqiao and Lingang factories. Contacting sensors are calibrated using NIST-traceable standard KCl reference solutions (84 μS/cm, 1,413 μS/cm, 12.88 mS/cm) within thermostated calibration baths.
Pressure tests (up to 1.6 MPa or customer spec) and dielectric isolation resistance checks (500VDC >100 MΩ) are recorded and archived against individual serial numbers, with factory calibration certificates provided inside every shipping carton.