Fermentation Spec
China High-temperature pH Sensor for Fermentation
Engineered for repeated 130°C SIP steam sterilization cycles and high bio-broth turbulence without signal drift.
- 0-130°C Operable
- PG13.5 Thread
- Drift <0.02 pH/mo
Direct-From-Factory Instrumentation
High-Precision pH/ORP Sensors for Harsh Chemical Media
Explore our flagship heavy-duty pH electrodes engineered in Shanghai, proven across hot acidic leaching, alkaline scrubbers, and sterile biopharma synthesis.
Fermentation Spec
0-130°C Rugged
Wholesale High Temperature (0-130℃) pH Sensor
Designed for continuous concentrated acid/alkali reactor monitoring, featuring a pressurized polymer gel reference.
- pH 0-14 Full Span
- 0.6 MPa Rating
- Polymer Gel Electrolyte
Internal Pt100/1000
High Temp (0-130℃) Sensor With Integrated ATC
Dual chemical-resistant glass housing embedding internal precision RTD for dynamic Nernst compensation.
- Built-in Pt1000
- Tri-Clamping / Thread
- Zero Alkali Error
Standard S8 Socket
High-Temperature S8 Connector pH Electrode
Universal industrial plug-in design compatible with global process assemblies; moisture-sealed IP68 socket.
- Standard S8 / PG13.5
- High-Alkali Glass
- Annular PTFE Junction
Shanghai Brand Award
pH5806 Industrial Acid-Alkali pH Electrode
The gold-standard high-temperature electrode, accredited by the Shanghai Brand council for zero-defect endurance.
- 0-135°C Rated
- Triple Ceramic Junction
- Anti-HF Formulation
Smart Digital RS485
IOT-485-pH Modbus Digital Acid/Base Sensor
Onboard micro-processing digitizes raw mV immediately, outputting noise-immune Modbus RTU telemetry to PLC/DCS.
- Direct RS485 Modbus
- Stores Calibration Data
- IP68 Fully Submersible
Controller Host
pHG-2081Pro Dual-Channel Acid/Alkali Controller
Heavy-duty aluminum-alloy transmitter providing isolated 4-20mA, Modbus, and multi-stage relay dosing interlocks.
- Dual Isolated 4-20mA
- High/Low Alarm Relays
- NEMA 4X / IP65 Enclosure
Chemical Titration Alt
SJG-2083CS Inductive Acid/Alkali Concentration Meter
Toroidal electromagnetic induction system measuring commercial grade HNO3, H2SO4, HCl, and NaOH up to 98%.
- Non-Contact Sensor
- 0-10% to 0-98% Range
- Zero Electrode Etching
Analytical Science & Engineering Whitepaper
Overcoming Thermodynamic Instability in Ultra-Harsh pH Media
Why conventional pH sensors fail catastrophically in industrial acid-alkali processes, and how BOQU's material chemistry guarantees precision, junction longevity, and drift immunity.
Elimination of "Alkaline Error" (Sodium Ion Interference)
At pH > 12.0 and elevated temperatures, standard silicate glass membranes exchange lithium ions ($Li^+$) for aqueous sodium ($Na^+$) or potassium ($K^+$), generating a false acidic potential drop known as "sodium error." BOQU synthesizes proprietary lithium-barium-silicate glass matrices with ultra-dense network modifiers. This suppresses cation interdiffusion, keeping measurement linear through pH 14 without empirical fudge factors.
Pressurized Polymer Gel vs. Reference Poisoning
The primary root cause of industrial pH failure is reference contamination. Sulfides ($S^{2-}$), cyanides ($CN^-$), and heavy ions precipitate silver chloride at the junction ($Ag_2S$), causing irreversible open-circuit drift. BOQU utilizes solid-state crosslinked polymer gels pre-pressurized to 0.6 MPa with an annular PTFE porous junction. The outward electrolyte flux prevents process liquor ingress completely.
Hydrofluoric Acid (HF) Etch Resistance
In wet chemical etching, semiconductor wafer cleaning, and pickling liquors, trace hydrofluoric acid rapidly dissolves standard glass membranes via silica leaching ($SiO_2 + 6HF \rightarrow H_2SiF_6 + 2H_2O$). BOQU incorporates fluorine-resistant antimony/rare-earth alloy membranes and sacrificial silicon gel barriers, extending operational service life by 400% compared to standard sensors.
| Performance Parameter | Standard Commercial pH Electrode | BOQU Strong Acid/Alkali Electrode | Operational Impact & TCO ROI |
|---|---|---|---|
| Measuring Span | 2.0 – 12.0 pH | 0.00 – 14.00 pH Full Spectrum | Accurate titration control across extreme extremes. |
| Max Pressure Rating | 0.2 MPa (2 bar) atmospheric | 0.6 – 1.0 MPa (6 – 10 bar) Pressurized | Direct insertion in high-pressure reactor lines without coolers. |
| Operating Temperature | 0°C to 60°C | -10°C to +135°C Continuous (Steam Sterilizable) | Eliminates frequent probe thermal shock cracking. |
| Reference Electrolyte | Aqueous 3M KCl liquid (evaporates/leaks) | Polymerized Solid Gel with Ag/AgCl Trap | Zero maintenance, zero refilling, 12+ months life. |
| Alkaline Deviation (pH 13 @ 50°C) | +0.65 to +1.20 pH (High Error) | < ±0.05 pH (Calibrated Flat-line) | Prevents overdosing costly caustic neutralizers ($NaOH$). |
Localized Plant Integration
Mission-Critical Use Cases Across Global Process Industries
Real-world integration blueprints where precision dosing, hazardous atmosphere compliance, and anti-fouling electrode mechanics ensure process safety.
1. Chlor-Alkali & Chemical Synthesis
In membrane-cell brine electrolysis and continuous chlorination reactions, free chlorine ($Cl_2$) and hypochlorite rapidly oxidize conventional reference wires. BOQU's dual-chamber reference utilizes KNO3 / KCl salt bridges with chemically inert ceramic diffusion frits, isolating the active sensing element from corrosive oxidizers.
2. Semiconductor Wet Benches & Etch Baths
Microchip manufacturing requires precision control of SC-1 ($NH_4OH/H_2O_2$) and piranha etch chemistries. Any metallic ion shedding ruins wafer lots. BOQU electrodes feature high-purity virgin PVDF / PFA bodies with absolute metal-free wet surfaces, conforming strictly to SEMI cleanroom process standards.
3. Hydrometallurgical Acid Leaching
Extracting nickel, cobalt, and gold involves slurries of 20–30% sulfuric acid ($H_2SO_4$) packed with abrasive suspended minerals at 90°C. Standard glass bulbs erode within weeks. BOQU utilizes hemispherical 1.2mm thick impact glass with flat annular PTFE junctions that self-polish under flow turbulence.
4. Flue Gas Desulfurization (FGD) Scrubbers
Coal-fired power generation and waste incineration plants run wet limestone scrubbers where gypsum scaling ($CaSO_4$) coats electrodes within hours. BOQU sensors couple with automatic ultrasonic cleaning rings or dynamic pneumatic water/acid jet wash assemblies to maintain online fidelity without manual extraction.
5. Pharma & Biotech Bioreactors
During antibiotic and recombinant protein fermentation, processes must undergo repeated Clean-in-Place (CIP with 2% NaOH at 85°C) and Sterilize-in-Place (SIP with pure saturated steam at 130°C). Our pH5806 series holds FDA USP Class VI biosafe compliance, exhibiting zero calibration drift post-autoclave.
6. Industrial Heavy Effluent Neutralization
Zero Liquid Discharge (ZLD) treatment facilities handle fluctuating batches of spent acids, lime milk, and oily wash waters. BOQU's dual-channel DCA130 & pHG-2081Pro controllers command multi-stage variable-speed dosing pumps via PID, eliminating overshooting and regulatory non-compliance fines.
Made in Shanghai — Factory Powerhouse
China Factory Supply Chain Resilience & Production Scale
Direct from our 4,632 m² Kangqiao & Lingang manufacturing hubs. Complete vertical integration translates to 40% cost reduction and guaranteed 5-day export dispatch.
100% Vertical Component Autonomy
Unlike assembly assemblers who outsource glass blowing and chemistry, BOQU operates China's foremost dedicated high-temperature sensor laboratory. We blow our own proprietary glass bulbs, compound our own pressurized polymer gels, and produce our own SMT surface-mount circuit boards in-house. This shields our wholesale partners from global supply chain choke points.
Rigorous 48-Hour Thermal & Drift Burn-In
Every single wholesale electrode undergoes 48 hours of uninterrupted thermal and pressure cycling before packaging. Sensors are immersed in cycling pH 4.01, 7.00, and 10.01 buffers under 0.6 MPa autoclave chambers. If a batch exhibits more than ±0.03 pH slope deviation or delayed millivolt response ($T_{95} > 10\text{s}$), it is automatically recycled.
Agile OEM/ODM White-Label Packaging
Empowering multinational brand houses and municipal EPC contractors. We offer bespoke insertion lengths (120mm, 225mm, 325mm, 425mm), customized temperature sensor embeddings (Pt100, Pt1000, NTC 10K), proprietary laser etching of your brand logo, customized cable sleeves (PTFE, silicon, braided), and pre-configured RS485 Modbus node addresses.
R&D Horizons 2026–2030
Electrochemical Roadmap: Solid-State, Optical & Edge-AI Sensors
How Shanghai BOQU Instrument is revolutionizing continuous analytical chemistry for the next era of smart Industry 4.0 infrastructure.
Current Generation: High-Polymer Gel
Glass Bulb with Annular Ceramic & PTFE Diaphragm
The established industry workhorse across 90% of global industrial wastewater and chemical reaction vessels.
- ✓ Range: 0.00 – 14.00 pH, -10°C to 130°C.
- ✓ Electrolyte: High-molecular weight polymerized gel saturated with KCl.
- ✓ Response Speed: $T_{90} \le 8$ seconds in clean media.
- ✓ Maintenance: Requires bi-monthly single or two-point calibration check.
- ✓ Expected Service Life: 12–18 months in standard acid/alkali duties.
Next-Gen Horizon: All-Solid-State ISFET & Edge-AI
Chip-Scale Ceramic ISFET with Predictive Health Diagnostic
BOQU's cutting-edge solid-state architecture designed for zero-breakage pharmaceutical and food processing lines.
- ★ Zero Glass Bulb: Unbreakable silicon nitride ($Si_3N_4$) semiconductor gate.
- ★ Dry Storage Ready: Can be stored indefinitely in dry state without electrolyte desiccation.
- ★ Embedded Machine Learning: Internal ASIC analyzes impedance spectroscopy continuously to forecast junction clogging 14 days in advance.
- ★ Digital Twin Ready: Native MQTT and Modbus telemetry over RS485 directly to cloud control suites.
- ★ Expected Service Life: 24–36 months under severe abrasive slurries.
Direct Wholesale Matrix
Wholesale Strong Acid Alkali pH Electrode Pricelist
Transparent tiered volume pricing for international instrument distributors, skid builders, system integrators, and engineering EPCs. FOB Shanghai / CIF Worldwide.
| Model Code | Electrochemical Description | MOQ (1-9 pcs) | Tier 1 (10-49 pcs) | Tier 2 (50-199 pcs) | OEM Tier (200+ pcs) | Lead Time |
|---|---|---|---|---|---|---|
| pH5806-HT | High-Temp Steam Sterilizable Electrode (0-135°C), PG13.5, S8 connector | $125.00 | $95.00 | $78.00 | Inquire Custom OEM | 3 - 5 Days |
| pH5806-ATC | Integrated Pt100/1000 ATC Sensor, 0-130°C, high alkali lithium glass | $145.00 | $110.00 | $89.00 | Inquire Custom OEM | 3 - 5 Days |
| IOT-485-pH | Digital RS485 Modbus RTU Heavy-duty submersible acid-alkali probe | $180.00 | $140.00 | $115.00 | Inquire Custom OEM | 5 - 7 Days |
| pH-HF-100 | HF-Resistant Antimony Glass Membrane for hydrofluoric acid etching bath | $160.00 | $125.00 | $98.00 | Inquire Custom OEM | 5 - 7 Days |
| pHG-2081Pro | Wall-mount / Panel Online pH Transmitter (Dual 4-20mA, Modbus, Relays) | $260.00 | $210.00 | $175.00 | Inquire Custom OEM | 3 - 5 Days |
| SJG-2083CS | Toroidal Inductive Acid/Alkali Concentration Meter with probe | $450.00 | $380.00 | $320.00 | Inquire Custom OEM | 7 - 10 Days |
* Pricelist indicative in USD. Full batch customization includes free laser silk-screen labeling, custom cable length extensions ($1.50/meter), and country-specific certificate dossiers (CE, ISO, SGS, FDA).
Audit-Proof Compliance
Global Standards, Traceable Calibration & Field Support
Engineered to satisfy the strictest regulatory frameworks across North America, Europe, the Middle East, and Asia Pacific.
Certified International Quality
All facilities are certified under ISO 9001 (Quality Management) and ISO 14001 (Environmental Stewardship). Products bear official European CE conformity, third-party SGS manufacturing audits, and FDA food-contact grade material declarations.
Traceable NIST Standard Buffers
Every sensor is calibrated against NIST traceable secondary standard reference buffers ($pH\ 4.005, 6.865, 9.180$ at 25°C). Calibration reports are archived in our database for 5 years, providing full lot traceability for regulated pharmaceutical and atomic power installations.
Engineering Application Desk
Have an aggressive chemical matrix containing hydrofluoric acid, organic solvents, or high pressure? Our senior chemical instrumentation team reviews your process datasheets (flow velocity, ionic strength, chemical concentrations) to deliver custom housing specs and warranty guarantees.
Technical FAQs
Frequently Asked Questions by Industrial Instrumentation Engineers
In-depth electrochemistry answers to help you configure, install, and maintain pH sensors in corrosive environments.
What specific materials enable BOQU pH electrodes to resist strong acids and alkalis?
BOQU engineers utilize a three-part defense: (1) Alkaline-Resistant Lithium Glass: A formulation high in barium and lithium oxides and low in silicon dioxide, preventing lithium-sodium ion exchange up to pH 14; (2) Solid Crosslinked Polymer Gel: Replaces liquid KCl electrolyte to prevent dilution, wash-out, and volatile evaporation; (3) Double / Triple Annular PTFE Porous Junctions: PTFE is chemically impervious to aggressive solvents, concentrated nitric acid, hydrochloric acid, and caustic soda, guaranteeing steady ionic diffusion.
How does the pH5806 sensor withstand repeated Clean-in-Place (CIP) and Steam Sterilization (SIP)?
Thermal shock during SIP (130°C pure saturated steam) causes rapid internal pressure escalation. The pH5806 features an internal pressure compensation chamber pre-charged to 0.4–0.6 MPa. This internal overpressure balances external steam pressure, preventing steam penetration through the reference junction. Furthermore, our specialized high-temperature annealing glass envelope withstands extreme thermal expansion gradients without micro-fracturing.
Can I connect BOQU pH sensors directly to a third-party PLC, DCS, or SCADA system?
Yes. We offer two integration pathways: (1) Digital Smart Sensors (IOT-485-pH): Contain embedded microprocessors that compute temperature compensation and output direct RS485 Modbus RTU telemetry, wiring directly to PLC analog/digital input cards without external transmitters; (2) Traditional Analog Coaxial: Provide standard high-impedance mV signals terminating in BNC, S8, VP, or K8 connectors, fully compatible with existing Yokogawa, Endress+Hauser, Mettler Toledo, or Rosemount transmitters.
What is the difference between measuring high-concentration acids with a pH electrode versus an inductive concentration meter (SJG-2083CS)?
The pH scale is logarithmic and measures the activity of free hydronium ions ($H_3O^+$). In concentrated acids (e.g., >5% to 98% $H_2SO_4$ or $HCl$), ion activity saturates and no longer correlates linearly with pH (often reading negative values with high uncertainty). For concentrated chemical dosing and commercial bulk acid/base storage, our toroidal inductive concentration meter (SJG-2083CS) measures bulk conductivity through non-contact electromagnetic coils, offering superior linearity and infinite sensor lifespan.
What is your typical production lead time for wholesale B2B distributor orders?
Because we produce our own glass bulbs, polymer matrices, and housing shells at our Kangqiao and Lingang factories, standard sensor models (pH5806, high-temperature S8 series) in quantities of 50 to 500 units ship within 3 to 5 business days. Custom OEM projects involving specialized cable lengths, laser-branded enclosures, or custom thread configurations typically require 7 to 10 business days.
What information is needed to obtain a formal OEM wholesale quotation?
Please share: (1) Process chemical composition (presence of $HF$, strong organics, sulfides, high salts); (2) Temperature and pressure ranges; (3) Preferred mechanical connection (PG13.5, 3/4" NPT, immersion flange, Tri-Clamp); (4) Desired electrical output (Modbus RTU RS485, 4-20mA, or raw mV); and (5) Estimated batch quantity. Our application engineering desk will return a detailed quotation and specification dossier within 24 hours.
Complete Analytical Suite
Industrial Water Quality Analyzers & Multi-Parameter Panels
Complement your acid-alkali pH monitoring system with BOQU's full lineup of online analyzers, turbidity optics, and dissolved oxygen instruments.
Polarographic DO
DOG-208FA High-Temp Dissolved Oxygen Sensor
Sterilizable polarographic DO electrode tailored for high-temperature bioprocesses and aerobic fermentation.
- 0-130°C Autoclavable
- Steel Mesh Membrane
- High Aeration Stability
Infrared Optical
ZDYG-2088-01QX Online Optical Turbidity Sensor
90-degree scattered infrared absorption sensor with integrated mechanical wiper for self-cleaning in dirty slurries.
- 0-4000 NTU / MLSS
- Auto-Wiper Cleaning
- Direct RS485 Modbus
Dual Channel
DCA130 Online pH & Conductivity Analyzer
Monitors pH and Electrical Conductivity simultaneously on one panel, optimizing space in RO and dosing skids.
- pH + EC Integrated
- PID Dosing Relays
- Isolated Dual 4-20mA
Integrated Station
MPG-6099Plus Multi-Parameter Monitoring Panel
Complete wall-mounted skid integrating pH, residual chlorine, conductivity, turbidity, and temperature in real time.
- Modular Flow Cell
- Touchscreen Interface
- Cloud IoT Telemetry
Potentiostatic
Online Industrial Residual Chlorine Analyzer
Continuous constant-voltage amperometric chlorine detection without reagent consumption for municipal water.
- Free Chlorine & HOCl
- Zero Reagent Cost
- Auto Temperature Comp
SWAS Trace Level
Power Plant SWAS Trace Wet-Chemistry Analyzer
Sub-ppb trace silicate, sodium, and phosphate monitoring, shielding boiler turbines against silica deposition.
- Parts-Per-Billion (ppb)
- Auto Reagent Dispense
- Boiler Steam Safety
Pharma Purified Water
TOC-3042 Industrial Online TOC Analyzer
UV catalytic persulfate oxidation detecting trace total organic carbon across WFI loops and microelectronics ultrapure water.
- 0.001 to 10.00 mg/L
- USP/EP Compliant
- NDIR Spectrometry
EPA Discharge Compliance
Online COD, TP, TN, NH3-N Effluent Analyzer
Automated high-temperature digestion and spectrophotometric analysis for continuous regulatory outfall reporting.
- Automated Digestion
- Auto-Zero Calibration
- Tamper-Proof Logging
Direct B2B Procurement Desk
Partner with China's Premier pH Sensor Manufacturer
Request confidential distributor discount schedules, OEM technical whitepapers, or custom trial sensor prototypes for your demanding industrial acid-alkali lines.