High Temperature Sensor Portfolio (Series I)
Built with thermodynamic glass membranes, pressurized gel electrolyte systems, and direct RS485 telemetry to withstand cyclic SIP/CIP steam sterilization.
Macro Industry Landscape & Global Electrochemical Status
Analyzing systemic operational challenges across high-temperature chemical synthesis, pharmaceutical batch runs, and thermal power facilities.
Alkali Depletion & Asymmetry Drift
Standard silicate glass membranes experience rapid ion-exchange degradation above 80°C. In high alkaline media, lithium exchange creates systematic mV drift and glass thinning, requiring proprietary glass formulations.
Electrolyte Expansion & Poisoning
Thermal pressure fluctuations force process broth into conventional reference diaphragms, reacting with Ag/AgCl reference systems. Pressurized polymer gels and solid matrix junctions mitigate junction fouling.
In-line Digitization (Industry 4.0)
Traditional high-impedance mV signals degrade across lengthy runs in electro-noisy plants. Integrating micro-transmitters with RS485 Modbus RTU telemetry ensures pristine process control loops directly into DCS infrastructure.
Enterprise Solutions for High Thermal & Corrosive Environments
Cross-sector engineering solutions designed to eliminate thermal shock, reference poisoning, and maintenance downtime.
Sterilizable Bioreactors
Engineered for high-yield API synthesis and precision microbial fermentation. Resists repeated 130°C in-situ SIP cycles without recalibration drift or diaphragm crystallization.
Thermal Power SWAS
Specialized low-conductivity glass combined with sealed references, preventing streaming potentials and volatile amine poisoning in ultra-pure boiler feed and steam condensate.
Continuous Flue Gas Scrubber
Heavy-duty flat-bulb glass with self-cleaning fluidic housings designed for limestone slurry reactors. Minimizes scaling and abrasive particulate abrasion at elevated process temperatures.
Chemical Digest & Refining
Polymerized gel matrix references resistant to organic solvent extraction, concentrated sulfates, and chlor-alkali brine streams up to 130°C and 0.6 MPa working pressure.
Engineering Specification Matrix: High-Temp Series
Direct electrochemical and mechanical performance criteria verified at BOQU's Dedicated High-Temperature Water Quality Sensor Laboratory.
| Specification Parameter | Laboratory Grade Fermentation | Industrial Harsh Process | Digital IoT Telemetry Model |
|---|---|---|---|
| Operating Range | 0 – 14.00 pH | 0 – 14.00 pH | 0 – 14.00 pH |
| Temperature Tolerance | 0 – 130°C (Steam Sterilizable) | -10 – 130°C continuous | -10 – 130°C continuous |
| Pressure Resistance | Up to 0.6 MPa (6 Bar) | Up to 0.6 MPa (6 Bar) | Up to 0.6 MPa (6 Bar) |
| Reference System | Double Junction, Ag/AgCl / Polymer Gel | Solid Matrix / Annular Porous PTFE | Pressurized Polymer / Non-Poisoning Gel |
| Output Protocols | S8 / K8 / VP Multi-pin Connector | Direct Coaxial High-Temp Lead | RS485 Modbus RTU / Isolated 4-20mA |
| Sterilization Capability | CIP / SIP Cycle Resilient (>50 cycles) | Chemical CIP / Steam Flushing | Integrated Electronic Thermal Lock |
Regulatory Compliance & Global Localized Engineering
Delivering turn-key integration, on-site commissioning validation, and documented manufacturing traceability across global jurisdictions.
Biopharm & Sanitary (FDA / GMP)
Sensor wetted materials comply with FDA 21 CFR 177.2600. USP Class VI certified elastomeric seals, electro-polished 316L stainless steel process fittings (Ra < 0.4 μm), and full material traceability certificates.
European Union CE & RoHS
Complete compliance with EN 61326-1 EMC industrial immunity standards. Eliminates electromagnetic interference from large VFDs, agitators, and heating elements common in fermentation suites.
Factory Acceptance & Traceability
Every sensor undergoes a mandatory 48-hour continuous thermal pre-aging, multi-point buffer calibration, and pressure testing in our Shanghai laboratories before dispatch, accompanied by verified NIST certificates.
Worldwide Empirical Field Case Deployments
Documented uptime metrics and process improvements from industrial installations across 100+ nations.
Antibiotic Bioreactors (India)
Replaced imported glass sensors across 40 bioreactors running 126°C SIP regimes. Maintained calibration stability throughout 21-day continuous batch runs, cutting sensor spend by 42%.
Thermal Incineration SWAS (China)
Online monitoring of demineralized feed steam at a Beijing waste-to-energy complex. Zero sensor drift under cyclic 90°C thermal conditions, protecting multi-stage turbines from silica fouling.
Industrial Yeast Fermentation (Russia)
Delivered dual pH and DO probe assemblies into demanding beet-molasses fermentation media, surviving high-viscosity abrasive broth and automated nitric acid CIP cleaning.
Chemical Industrial Park (Vietnam)
Standardized multi-parameter effluent transmitters monitoring neutralizing reactors at 85°C. Met stringent QCVN Class A standards with autonomous RS485 data uplink to municipal environmental boards.
R&D Roadmap: AI Analytics & Solid-State Chemistry
Bridging electrochemical manufacturing with digital intelligence to empower predictive plant instrumentation.
Electrochemical Impedance Spectroscopy (EIS)
Integrating micro-EIS modules within the sensor body to evaluate glass membrane micro-fractures, reference junction clogging, and gel depletion in real time, delivering proactive maintenance prompts.
Non-Glass ISFET Micro-Transistors
Pioneering high-temperature Ion-Sensitive Field-Effect Transistor (ISFET) chips embedded in PEEK housings, engineered to deliver zero-glass food and parenteral manufacturing safety.
Edge Calibration & Digital Twins
Developing onboard microcontrollers holding complete factory calibration history, operating temperature logs, and dynamic drift compensation algorithms directly addressing thermal lag.
Frequently Asked Questions on High-Temp pH Sensing
In-depth technical answers addressing procurement, engineering, and maintenance concerns.
Standard pH sensors utilize low-temperature glass membranes that undergo rapid alkaline ion leaching, glass dissolution, and thermal micro-cracking when exposed to high heat. Additionally, standard liquid electrolyte references expand rapidly, leading to electrolyte boil-off or massive reference junction potential shifts. BOQU sensors feature high-temperature resistant lithium glass and pressurized polymerized gel electrolyte systems rated for continuous operation up to 130°C.
The BOQU pH5806 is built with a specialized thermodynamic glass bulb and an internal pressure-compensation barrier. The polymer gel reference prevents thermal expansion from blowing out the ceramic diaphragm during 121°C–130°C steam cycles. Once cooled back down to operating temperature (e.g., 37°C in biopharma), the membrane potential returns to zero-point symmetry without requiring immediate recalibration.
High-temperature processes often involve heavy electrical equipment such as motor-driven agitators, immersion heaters, and pumps. Analog high-impedance mV signals from pH electrodes degrade across short distances and are vulnerable to electromagnetic interference. BOQU digital IoT sensors convert the electrochemical potential directly at the probe head into an isolated digital RS485 Modbus signal, transmitting accurate data up to 1,000 meters directly to a DCS or PLC.
As a direct manufacturer with two Shanghai factories spanning 4,632 m², we offer comprehensive OEM/ODM engineering: custom immersion insertion lengths (120mm, 225mm, 325mm, 425mm), specialized high-temp connector options (S8, VP, K8, direct cable), custom PG13.5 process threading, private label silk-screening, custom baud rates, and specialized wetted materials (Hastelloy, Titanium, PEEK).
Online Analytical Instrumentation (Series II)
Continuous online controllers, optical analyzers, and dual-channel monitors designed to integrate directly with BOQU high-temperature sensors.
Direct Shanghai Manufacturing Capacity
Operational metrics from our Kangqiao and Lingang manufacturing facilities.