DOG-208FA High Temp DO Sensor
Designed for aerobic fermentation and steam-sterilizable bioprocess media up to 130℃. Zero drift polarographic membrane system.
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Direct Sourcing Solutions
Flagship Dissolved Oxygen & Analytical Instrumentation
Engineered in our 4,632 m² Shanghai manufacturing base. Built for extreme precision, high repeatability, and 48-hour burn-in reliability.
pH5806 High Temperature pH Sensor
Rugged specialized glass electrode engineered for bioreactors, surviving repeated CIP/SIP steam sterilization cycles.
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IOT-485-pH Digital Sensor
RS485 Modbus RTU interface connecting directly to industrial PLC, SCADA, or IoT gateways without external transmitters.
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ZDYG-2088-01QX Turbidity Sensor
Infrared 90° scattered light sensor for drinking water and sludge MLSS. Optional integrated pneumatic self-cleaning scraper.
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DCA130 Online pH & EC Controller
Simultaneous pH and electrical conductivity analysis. Isolated 4-20mA outputs with programmable high/low alarm relays.
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MPG-6099Plus Water Station
Modular wall-mounted station for continuous DO, pH, residual chlorine, conductivity, and turbidity monitoring with data logging.
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pHG-2081Pro Online Analyzer
High-stability transmitter for closed-loop neutralization dosing in complex chemical, metal treatment, and wastewater plants.
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SJG-2083CS Concentration Meter
Toroidal electrodeless conductivity analysis for acid/base concentrations, CIP systems, and corrosive industrial liquid streams.
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Technical White Paper & Industry Insight
The Global Landscape of Dissolved Oxygen Monitoring
From optical fluorescence quenching to high-temperature electrochemistry: how modern DO sensing drives regulatory compliance, operational automation, and bio-yield optimization.
Industrial Status: The Paradigm Shift to Optical & Smart Digital DO Sensing
Dissolved Oxygen (DO) is a mission-critical process variable across municipal aeration systems, recirculating aquaculture systems (RAS), and biopharmaceutical fermenters. Historically, industrial facilities depended strictly on electrochemical (galvanic and polarographic) sensors. While effective, traditional sensors present significant operational pain points: continuous consumption of oxygen at the cathode, high flow-velocity dependency, rapid electrolyte degradation, and the recurring labor expense of replacing fragile Teflon membranes.
Today, the global instrumentation market is experiencing a profound transition toward Optical Luminescent DO Sensors (LDO). Operating on the principle of dynamic luminescence quenching by molecular oxygen (Stern-Volmer physics), optical sensors consume zero dissolved oxygen, operate flawlessly in non-flowing or low-velocity stagnant tanks, and require minimal calibration. Coupled with integrated RS485 Modbus RTU microprocessors, modern DO instrumentation delivers digital self-diagnostics directly into industrial SCADA and Edge-IoT infrastructures.
Stern-Volmer Luminescence
Our optical DO probes emit blue excitation light onto a ruthenium/platinum fluorophore cap. Oxygen molecules quench the emitted red phase-shifted light in direct mathematical proportion to partial pressure, providing calibration drift stability exceeding 365 days.
130℃ SIP Fermentation Durability
Biopharma fermentation vessels require repeated Steam-In-Place (SIP) and Clean-In-Place (CIP) cycles. Our DOG-208FA sensors utilize medical-grade 316L stainless steel bodies and specialized composite internal electrolytes engineered to withstand thermal shocks up to 130℃.
Direct Cloud & PLC Integration
Eliminate obsolete, high-cost external transmitter boxes. BOQU smart sensors house onboard 24-bit ADCs and pre-calibrated firmware that directly output isolated RS485 Modbus RTU or 4-20mA signals into PLC racks and remote telemetry RTUs.
Supply Chain Excellence
China Manufacturing Scale & Engineering Efficiency
How Shanghai BOQU Instrument delivers precision-tier analytical sensors at competitive wholesale economics without engineering compromises.
End-to-End Vertical Integration
From raw glass blowing for pH/ORP bulbs to automated CNC sensor housing fabrication, optical lens assembly, and surface-mount PCB production, BOQU maintains total internal control across our Kangqiao and Lingang workshops.
Rigorous 48-Hour Burn-In Testing
Every single sensor and analyzer unit undergoes continuous 48-hour thermal, electrical aging, and multi-point buffer calibration tests prior to packaging, slashing field-failure rates to below 0.12% across global installations.
Agile OEM / ODM Wholesale Adaptability
Global instrumentation brands and system integrators leverage our specialized OEM services: custom branding, tailored cable lengths, private Modbus register mappings, titanium housing upgrades, and customized process fittings.
2007
Established Year
4,632m²
Facility Floorspace
200+
Engineers & Technicians
100k+
Annual Instrument Output
100+
Export Nations
2,000+
Enterprise Clients
Application Engineering
Industrial Application Scenarios & Sensor Selection
Matching dissolved oxygen sensing technology with process conditions: biological loads, chemical environments, and mechanical stresses.
Municipal & Industrial Wastewater
Crucial Factor: Severe biological fouling, variable high turbidity, and high energy costs associated with blower aeration basins.
Recommended Solution: Optical DO Sensors with automatic air-purge or mechanical wipe systems. By keeping DO within the optimal 1.5–2.5 mg/L nitrification window, wastewater operators reduce aeration electricity consumption by up to 25% while meeting discharge permits.
Intensive Aquaculture & RAS
Crucial Factor: High bio-density, risk of nocturnal hypoxic crashes, and continuous corrosive saltwater exposure.
Recommended Solution: Digital DO Probes with salinity and temperature compensation. Linked directly via Modbus to emergency aerator contacts and frequency inverters, preventing fatal stock losses and improving feed conversion ratios (FCR).
Pharma Fermentation & Biotech
Crucial Factor: Demanding batch sterility, repetitive 121℃–130℃ steam sterilization, and narrow cellular metabolism windows.
Recommended Solution: DOG-208FA High-Temperature Polarographic DO Electrodes matched with sanitary Pg13.5 process connections. Designed for bioreactor ports with 100% leak-proof internal electrolyte reservoirs.
| Water Parameter | Sensor Technology | Primary Industrial Use-Case | Specification & Engineering Tip |
|---|---|---|---|
| Dissolved Oxygen (DO) | Optical Luminescent / Polarographic | Aeration Basins, Bioreactors, RAS | Select optical for zero maintenance in dirty effluent; select polarographic for high-temp 130℃ SIP sterilization. |
| pH & ORP | Specialized Glass Bulb / Platinum ORP | Chemical Neutralization, Fermentation | Use pressurized gel electrolytes for processes with fluctuating pressures or heavy sulfide contamination. |
| Conductivity & TDS | 2-Electrode / Toroidal Inductive | RO Pure Water, Boiler Feed, CIP Systems | Specify inductive toroidal sensors for dirty chemical dosing (acid/caustic) to avoid electrode polarization. |
| Turbidity & TSS | Infrared 90° Scattered Light | Filter Beds, Discharge Outfalls, MLSS | Equip sensors with pneumatic air or brush cleaning when measuring activated sludge over 3,000 mg/L. |
| Trace SWAS Chemistry | Colorimetric & Ion-Selective Cells | Power Generation Steam & Boilers | Always install pressure-reducing and sample-cooling modules upstream of trace silica and sodium analyzers. |
Procurement Advisory
International B2B Procurement Standards
Engineering checklist for EPC contractors, distributor purchase managers, and plant instrumentation directors.
Key Specification Parameters Required
- Measurement Range: 0–20 mg/L (ppm) for environmental/wastewater; ppb trace range (0–200 μg/L) for power plant deaerators.
- Temperature & Pressure Ratings: Verify operating envelope (standard: 0–50℃ / 3 bar; fermentation: up to 130℃ / 6 bar).
- Wetted Materials: Standard PPS/PVDF bodies for wastewater; SUS316L, Titanium, or Hastelloy for pharmaceutical and corrosive brine environments.
- Communication Topology: Isolated 4-20mA current loop with HART, or multi-drop RS485 Modbus RTU networking.
- Mounting Hardware: Submersible immersion pipes, flow-through sample cells, or retractable pipeline ball-valve assemblies.
Compliance, Traceability & Delivery
- International Conformity: CE marking under EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU.
- System Certifications: ISO 9001 (Quality Assurance) and ISO 14001 (Environmental Management) verified.
- Factory Calibration Certificates: Individual calibration logs traceable to standard oxygen saturation tables.
- Packaging & Fast Lead-Times: Shock-absorbent hermetic packaging with standard wholesale batches dispatchable within 3–7 business days.
- Support & Warranty: Complete 12-to-24 month warranty coverage with engineer-level remote calibration assistance.
Original Catalog Reference
Original High-Temperature Series Verification
Retained direct access to factory standard high-temperature sensors and wholesale supplier endpoints.
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China High-temperature pH Sensor Used Pharmaceutical Fermentation Wholesaler, Supplier
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Wholesale High Temperature (0-130℃) pH Sensor Supplier, Factories
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Wholesale High-temperature S8 Connector pH Sensor Manufacturers, Factory
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China High Temperature (0-130℃) pH Sensor With Temperature Wholesaler, Suppliers
Technical Support & Sourcing FAQ
Frequently Asked Questions for Global Buyers
Answers compiled directly by BOQU engineering directors and overseas export specialists.
Is Shanghai BOQU Instrument a verified manufacturer or a trading agent?
Shanghai BOQU Instrument Co., Ltd. is an authentic original equipment manufacturer founded in 2007. We design, machine, assemble, and test all instruments across two owned Shanghai facilities (Kangqiao and Lingang) covering 4,632 m² of floorspace. With over 200 dedicated staff, our annual production exceeds 100,000 analytical instruments and precision sensors.
What is the core difference between Optical DO and Polarographic DO sensors?
Optical DO sensors measure the phase shift of luminescence quenched by oxygen molecules. They consume no oxygen, do not require water movement, and operate without replacement electrolytes or membranes, making them the premier choice for wastewater aeration basins and aquaculture. Polarographic DO sensors use a polarized gold/silver electrode system; while they require periodic electrolyte replenishment, their structural tolerance makes them uniquely suited for high-temperature bioprocess fermentation and repeated 130℃ steam sterilization.
Which international certifications back BOQU instruments?
All factory operations conform strictly to ISO 9001 quality management and ISO 14001 environmental safety frameworks. Our instruments carry European CE conformity certificates, SGS third-party audit reports, and FDA-compliant materials documentation for food and pharmaceutical contact. The flagship pH5806 sensor has also received the prestigious Shanghai Brand certification.
Can BOQU dissolved oxygen sensors integrate directly into our DCS or SCADA?
Yes. Our digital sensor line houses microprocessors providing RS485 Modbus RTU communication protocols directly from the sensor head. They wire directly into existing PLC, DCS, SCADA, or cloud telemetry hardware without requiring a separate, costly transmitter. For conventional loops, we provide 4-20mA current loop outputs with high/low SPDT relay alarm outputs.
What OEM & ODM customization options do you offer for distributors?
We provide full-spectrum private labeling: laser-etched distributor branding, customized enclosure colors, bespoke cable lengths (up to 100 meters), custom mounting flange threads (NPT, BSP, Tri-Clamp), adapted measurement ranges, and dedicated firmware with customized Modbus register addresses.
What process data is required to receive an optimal instrument configuration quote?
To assist our application engineers, please specify: (1) Parameter to be measured, (2) Expected measurement range and concentration units, (3) Medium type and chemical constituents, (4) Operating temperature and pipeline/vessel pressure, (5) Installation method (immersion, flow-through, or in-line retractable), and (6) Preferred signal output (4-20mA or RS485 Modbus).
Analytical Ecosystem
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Complete online sensing instrumentation engineered to protect industrial boilers, municipal networks, and biochemical processes.
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Continuous amperometric free chlorine detection for drinking water networks and cooling towers with automatic pH compensation.
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pH5806 Bioreactor Sensor
High-temperature reference gel electrode capable of sustaining repetitive 130℃ steam sterilization without drift.
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DOG-208FA Polarographic DO
Precise dissolved oxygen control in pilot bioreactors, delivering linear response up to high pressures and temperatures.
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IOT Digital pH Electrode
Direct Modbus sensor head with internal memory storing historical calibration data, operating hours, and health diagnostics.
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ZDYG Digital Turbidity Probe
Accurate nephelometric suspended solids and turbidity monitoring with scratch-resistant sapphire optical windows.
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Partner directly with Shanghai BOQU Instrument Co., Ltd. Enjoy manufacturer-direct volume pricing, dedicated OEM design teams, and verified reliable instrumentation backed by 18+ years of field expertise.