Explore our Shanghai factory's standard production run of acid-resistant, high-temperature pH and chemical-concentration analytical probes equipped with digital Modbus telemetry.
Designed for sterile bioreactors and hot acidic streams up to 130°C. Resists protein fouling and aggressive organic acid erosion.
Integrated Pt100/Pt1000 RTD within heavy-wall borosilicate glass. Perfect for aggressive pickling baths and dilute acid monitoring.
Industry-standard thread connector with robust gel reference system. Engineered for high chemical stability and field interchangeability.
Factory-calibrated electrode with dual-ceramic junction architecture preventing electrolyte poisoning in presence of sulfur ions.
Awarded official Shanghai Brand certification. Built with thick-membrane low-impedance glass to survive SIP/CIP and acid baths.
Direct inline inductive toroidal analyzer for 0–99.9% H2SO4, HCl, and NaOH. Non-contact electrodeless design eliminates fouling.
Rugged IP65 wall-mount transmitter featuring dual 4–20 mA outputs, RS485 Modbus RTU, and programmable high/low dosing relays.
Smart sensor with onboard analog-to-digital signal processing. Transmits temperature-compensated data straight to DCS without transmitter.
A rigorous examination of continuous concentration measurement, corrosion kinetics, electrodeless conductivity physics, and global plant cost optimization.
Sulfuric acid is universally recognized as the foundational barometer of industrial chemistry. From contact manufacturing facilities to lithium battery hydrometallurgy, precise determination of H₂SO₄ concentration determines process yield, safety, and equipment integrity. However, continuous inline measurement presents severe physical chemistry challenges: extreme exothermic behavior upon dilution, severe corrosiveness toward contacting metals, and non-linear electro-chemical conductivity profiles.
In dilute solutions (0–20% concentration or pH < 2.0), conventional potentiometric glass electrodes provide adequate resolution if paired with heavy-duty chemical junctions. Yet, when sulfuric acid exceeds 20% by weight, classical pH electrodes fail due to ionic dehydration, reference junction potential breakdown, and glass membrane dissolution. For high concentration streams (20% to 99.9% H₂SO₄), electrodeless toroidal (inductive) conductivity sensing represents the engineering gold standard.
The inductive sensor induces an alternating current within a closed loop of liquid via a primary drive coil, while a secondary pick-up coil detects the resulting magnetic field strength, which correlates precisely with the fluid's specific conductance. Because toroidal probes are completely encased in virgin fluoropolymers like PFA (Perfluoroalkoxy) or PVDF (Polyvinylidene Fluoride), no conductive electrode surfaces touch the acid stream, completely eliminating fouling, corrosion, and polarization errors.
Modern microelectronics fabrication plants utilize high-temperature Piranha solution (H₂SO₄ combined with H₂O₂ at 120°C–140°C) for organic removal from silicon wafers. Sensors must resist blistering while providing parts-per-thousand repeatability to optimize acid recovery loops.
Extracting Nickel, Cobalt, and Lithium from laterite ores or black mass recycling requires aggressive high-pressure acid leaching (HPAL). Toroidal inline sensors monitor 5% to 25% free sulfuric acid amidst dense mineral slurries without clogging.
Sulfuric acid alkylation units demand continuous monitoring of 88% to 95% spent and fresh acid phases. Real-time data minimizes acid runaway risks, lowers emulsion tendencies, and saves millions in catalyst consumption.
A classic challenge in sulfuric acid monitoring is that electrical conductivity exhibits a parabolic relationship with concentration. Specific conductance peaks at ~30% H₂SO₄, dips significantly at 84%, reaches a local peak at ~92%, and collapses near 98.3% (azeotropic point). Modern analyzers like the BOQU SJG-2083CS utilize specialized multi-segment polynomial linearization algorithms and high-speed RTD temperature compensation to disambiguate ambiguous readings, ensuring absolute accuracy regardless of concentration regime.
Direct manufacturer ex-works price guidelines for engineering contractors, system integrators, and plant procurement teams worldwide.
| Model / Product Code | Sensor Technology | Measurement Scope | Wetted Materials | Protection / Temp | Direct Unit Price (USD) | Typical Application |
|---|---|---|---|---|---|---|
| SJG-2083CS Toroidal Sensor | Electrodeless Inductive | 0.00% – 99.99% H₂SO₄ | Virgin PFA / PTFE Teflon | IP68 / Up to 130°C | $580 – $1,150 | Concentrated acid lines, chlor-alkali, alkylation |
| pH5806 High-Temp Electrode | Thick Membrane Glass | 0.00 – 14.00 pH | Borosilicate 3.3, Ceramic | 6 Bar / Up to 130°C | $160 – $320 | Acidic fermentation, leaching neutralization |
| pHG-2081Pro Controller | Microprocessor Dual-Loop | Universal pH/ORP/Temp | NEMA 4X / Cast Aluminum | IP65 Enclosure | $340 – $560 | DCS interfacing, pump relay PID dosing |
| IOT-485-pH Smart Probe | Digital Direct Modbus | 0.00 – 14.00 pH | Ryton PPS / PTFE Junction | IP68 / Up to 80°C | $190 – $380 | Distributed wastewater monitoring, OEM skids |
| DCA130 Dual Channel System | Toroidal EC + pH Combined | Dual Parameter Control | Panel Mount Polycarbonate | Modular I/O | $450 – $720 | Scrubber inlets and outlets, chemical recovery |
| Customized PFA Flowcell | Hydrodynamic Bypass Chamber | N/A (Fluid Chamber) | Machined Solid PFA / FFKM | 16 Bar / Up to 150°C | $220 – $480 | Pipeline sample conditioning, degas manifolds |
While mechanical refractometers and radiometric density sensors feature initial hardware costs exceeding $6,000–$12,000 per sample point, Shanghai BOQU's toroidal electrodeless systems average between $900 and $1,700 for a complete, fully certified analyzer and sensor package. Furthermore, because toroidal coils do not suffer electrode degradation or require frequent electrolyte replenishment, annual maintenance expenditures drop by over 80%, yielding payback periods inside 4 months for high-volume chemical installations.
Case breakdowns detailing physical installation architectures, chemical challenges, and telemetry integration across primary industries.
Operational Problem: During hot-rolled carbon steel descaling, sulfuric acid dissolves iron oxides to form ferrous sulfate (FeSO₄). As free acid is consumed, pickling efficiency drops drastically unless fresh 98% acid is metered into the baths.
BOQU Solution: SJG-2083CS Inductive sensor installed in a PVDF bypass loop with automated air-purge cleansing. The controller utilizes dual-variable curve calculation to isolate FeSO₄ background ionic noise and continuously calculate net active H₂SO₄ concentration.
Client ROI: Acid dosing volatility decreased by 34%, eliminating over-pickling metal loss and saving approximately $48,000 in monthly chemical makeup costs.
Operational Problem: In coal-fired power generation and metallurgy off-gas plants, SO₂/SO₃ scrubbers recover commercial-grade 93% or 98% sulfuric acid. Hot acid condensation (90°C–115°C) destroys ordinary seals and sensor housings within weeks.
BOQU Solution: Seamless PFA-molded toroidal sensors fitted with Kalrez® FFKM gaskets mounted directly onto DN50 glass-lined pipeline cross-pieces. Real-time 4–20 mA outputs feed boiler DCS safety interlocks.
Client ROI: Continuous 18-month uninterrupted operation without sensor failure or calibration drift, complying with stringent sulfur dioxide air emission standards.
Operational Problem: Raw industrial wastewater discharges with pH < 1.0 require massive lime (Ca(OH)₂) or caustic soda (NaOH) neutralization. Severe gypsum (CaSO₄) precipitation coats traditional glass sensors, causing deadbands and catastrophic pH overshoot.
BOQU Solution: Implementation of the pH5806 heavy-duty electrode featuring high-velocity mechanical brush cleaning heads paired with the pHG-2081Pro analyzer featuring proprietary anti-overshoot PID dosing logic.
Client ROI: Complete elimination of environmental discharge non-compliance fines; manual sensor cleaning frequency reduced from daily to once every 45 days.
Operational Problem: Lead-acid battery formation demands exceptionally tight sulfuric acid specific gravity control (1.240–1.280 s.g. at 25°C). Manual hydrometer testing is slow, labor-intensive, and poses severe operator acid burn risks.
BOQU Solution: Inline toroidal sensor integrated directly into the formulation manifold. Direct density/concentration conversion within the controller firmware triggers pneumatic batch valves automatically.
Client ROI: Automated batch cycle times decreased from 45 minutes to 8 minutes while achieving 100% repeatability across battery cell lot outputs.
Stringent production controls, metallurgy selection, and international safety certifications behind every Shanghai-manufactured instrument.
Sensors are manufactured using pure molded Teflon® PFA and Kynar® PVDF. These non-porous materials withstand boiling concentrated sulfuric acid, nitric acid mixtures, and aqua regia without environmental stress cracking or embrittlement.
For chemical and petrochemical installations subject to flammable vapors and explosive dust, BOQU analyzers and sensors are available with explosion-proof cast enclosures (Ex d IIC T6 Gb) and intrinsically safe galvanic isolators (Ex ia IIC T4 Ga).
Every sensor is subjected to an uninterrupted 48-hour environmental burn-in cycle followed by five-point standard wet chemical validation in our dedicated Shanghai laboratory before packing, guaranteeing zero-defect on-site commissioning.
Our two Shanghai production facilities (Pudong Kangqiao and Lingang Free Trade Zone) operate strictly under ISO 9001 (Quality Management) and ISO 14001 (Environmental Systems). All sensor wetted plastics conform to FDA 21 CFR 177.1550 sanitary standards, and all electrical hardware complies with European CE electromagnetic compatibility directives (EN 61326-1:2013).
How Shanghai BOQU is pioneering digital intelligence, edge algorithms, and solid-state materials for chemical process analytics.
By embedding high-frequency impedance spectroscopy directly onto sensor microcontrollers, upcoming BOQU digital probes will continuously calculate glass membrane resistance and toroidal flux dissipation, forecasting sensor end-of-life weeks in advance.
Transitioning from pure wired RS485 Modbus networks to hybrid direct-to-cloud architectures. Next-generation smart transmitters will incorporate LoRaWAN, NB-IoT, and 4G connectivity with native MQTT protocols for unmanned chemical tank farm tracking.
Eliminating fragile glass membranes entirely. Ongoing R&D partnerships with leading Shanghai universities are advancing Ion-Sensitive Field Effect Transistors (ISFET) capable of handling extreme shock, mechanical pulsation, and abrasive mineral crystal slurry.
In-depth responses compiled by BOQU's senior analytical instrumentation engineering team.
Complete your facility's process analytics loop with BOQU's field-proven dissolved oxygen, turbidity, multi-parameter, and chemical analyzer lineup.
Polarographic dissolved oxygen electrode built to endure repeated 130°C steam sterilization in bioprocessing and hot chemical recovery lines.
Dual-beam 860nm scattered light optical sensor for effluent suspended solids and clarifier monitoring. Features integrated wiper mechanism.
Space-saving compact transmitter tracking both pH and electrical conductivity on a single backlit display. Ideal for RO and dosing skids.
Turnkey backplate station integrating pH, residual chlorine, turbidity, conductivity, and DO. Plumb-and-play water quality station.
Amperometric measurement system providing continuous free chlorine readings with automatic temperature and pH cross-compensation.
Parts-per-billion photometric analyzer engineered for thermal power plant steam, boiler feedwater, and condensate polishing loops.
Direct UV-persulfate oxidation analyzer monitoring total organic carbon in pharmaceutical water for injection (WFI) and pure steam.
Full-cabinet wet-chemistry photometric workstation providing regulatory outfall compliance data with automatic sample digestion.
Whether you require an individual high-temperature sulfuric acid sensor, a custom OEM toroidal bypass chamber, or an integrated multi-parameter industrial skid, our factory engineers deliver precision-calibrated solutions tailored to your operational budget.
