High-Precision Sensors & Process Monitoring Units
Explore our industrial-grade digital sensing devices, sterilization-tolerant pH assemblies, and online analytical instrumentation engineered for severe conditions.
High-Temp Fermentation pH Sensor
Designed for repeated steam-in-place (SIP) bioreactors with zero drift and long electrolyte lifespans.
High Temp (0-130℃) pH Unit
High-alkali and heat-resistant glass bulb designed to survive heavy chemical synthesis reactors.
0-130℃ pH Sensor with Temp NTC
Integrated Pt100/Pt1000 RTD sensor inside the electrode shaft for automatic temperature compensation.
High-Temp S8 Connector Sensor
Standardized PG13.5 mechanical thread with IP68 S8 plug for rapid swap-out during industrial batches.
pH5806 Shanghai Brand Probe
Top-tier industrial pH electrode holding Shanghai Brand recognition for precision biopharma work.
DOG-208FA Sterilizable DO Unit
Robust polarographic dissolved oxygen measuring cell maintaining high accuracy after autoclaving.
IOT-485 Modbus Smart Probe
Direct RS-485 output for streamlined telemetry integration with DCS, PLC, and smart gateways.
ZDYG-2088 Optical Turbidity Unit
Infrared scattered-light method equipped with automated wiper cleaning for continuous effluent logging.
Global Landscape: The Rise of Online Total Nitrogen Monitoring
Total Nitrogen (TN)—encompassing Nitrate (NO₃⁻), Nitrite (NO₂⁻), Ammonia (NH₄⁺/NH₃), and Organic Nitrogen—stands as the definitive metric for evaluating aquatic eutrophication risk.
2007
Year Established
4,632 m²
Manufacturing Base
100,000+
Annual Units Built
100+
Export Destinations
The Paradigm Shift in Industrial Wastewater and Surface Discharge
Throughout North America, the European Union (under the Industrial Emissions Directive 2010/75/EU), and East Asia, environmental ministries have systematically moved away from periodic grab-sampling protocols. Traditional laboratory wet-chemistry techniques, like standard Kjeldahl digestion, introduce significant reporting lags of 24 to 72 hours. This delay leaves biological nutrient removal (BNR) systems susceptible to massive shock-loads and regulatory permit violations.
The contemporary standard demands continuous online Total Nitrogen (TN) monitoring units capable of autonomous digestion and spectrophotometric evaluation at 30-to-60 minute cycle intervals. By combining alkaline potassium persulfate digestion under elevated temperatures (120–125°C) with dual-wavelength ultraviolet absorption spectroscopy (220 nm and 275 nm), modern China Total Nitrogen Units provide rapid, legally admissible telemetry data directly to SCADA and municipal environmental compliance nodes.
| Analytical Technology | Typical Digestion / Oxidation Method | Reagent Usage & Operational Cost | Cycle Speed & Uptime | Industry Fit & Sample Matrix |
|---|---|---|---|---|
| Alkaline Persulfate UV Spectrophotometry | High-temperature, high-pressure thermostatic digestion (120°C+) | Low-to-moderate; uses stable potassium persulfate and NaOH | 35–45 min per automated batch test | Municipal WWTP effluent, surface water, regulated outfalls |
| High-Temperature Catalytic Combustion | Thermal oxidation (680°C to 950°C) with chemiluminescence | Low chemical reagents; requires carrier gas & furnace parts | Real-time to 3 minutes continuous flow | Refineries, petrochemical streams, complex organic wastewater |
| Sum Parameter Calculation (NH₃-N + NOₓ-N) | Ion-selective electrodes (ISE) or optical direct UV scanning | Zero wet reagents; requires sensor membrane replacement | Instantaneous real-time monitoring (<10 seconds) | Aeration basin control, RAS aquaculture, preliminary screening |
The Chinese Factory Advantage: Scale, Engineering & Agility
Why Tier-1 international system integrators, EPC firms, and chemical conglomerates partner directly with Shanghai Boqu Instrument Co., Ltd. for process instrumentation.
Full Supply Chain Integration
Unlike Western suppliers that outsource machining, microfluidic manufacturing, and PCB fabrication across disparate vendors, our Shanghai facilities (Kangqiao and Lingang) span 4,632 m² of vertically consolidated manufacturing. We manufacture proprietary quartz flow cells, peristaltic dosing assemblies, optical dispersion blocks, and microcontroller boards entirely in-house.
Dedicated High-Temp Testing Labs
Boqu operates China's specialized high-temperature water quality sensor evaluation facility. Every sensor, including the pH5806 and DOG-208FA, undergoes rigorous simulated autoclave stress profiles (130°C thermal cycling) and pressurized drift validation over 48 continuous hours prior to sign-off and packing.
Unmatched TCO Reduction
Total Cost of Ownership (TCO) is the primary criterion for plant operators. By standardizing industrial modular architectures, our Total Nitrogen Units, multiparameter platforms, and sensors reduce initial capital expenditures by 40–55% and decrease replacement component lead times from weeks to 48 hours.
Flexible OEM / ODM Integration
We provide full white-label hardware and software customization. From localized interface languages, private label chassis configurations, and tailored Modbus RTU / Profibus-DP address maps to custom chemical reaction curve calibrations, our 200+ team delivers turnkey solutions for global OEMs.
Mission-Critical Industrial Applications & Field Architectures
Delivering high accuracy, uptime, and minimal reagent waste across complex chemical matrices and demanding environments.
Chemical & Fertilizer Complex Effluent
Effluents from urea production, nitrate processing, and pesticide synthesis exhibit fluctuating pH (2 to 12) and erratic organic loads. Installing a Boqu online Total Nitrogen Analyzer with dual-channel sample pretreatment prevents cross-contamination, while integrated caustic/acid dosing controls permit limits effectively.
Municipal Wastewater BNR Optimization
Real-time TN measurements let operators optimize external carbon source addition (such as methanol or sodium acetate) into anoxic denitrification zones. By matching dosing precisely to upstream TN spikes, municipal utilities typically save 20–35% in annual chemical costs while avoiding non-compliance penalties.
Biopharmaceutical Fermentation Nutrients
Microorganisms consume specialized nitrogen sources (such as yeast extract and amino acid complexes) during high-density fermentation. Pairing Boqu sterilizable pH5806 sensors, DOG-208FA dissolved oxygen probes, and online nutrient analytics maintains cell viability and maximizes batch production yields.
Comprehensive Total Nitrogen Analyzer Specifications
Standard architectural parameters for industrial plant engineers, instrumentation directors, and international EPC project leads.
| Technical Parameter | Standard Specification Details |
|---|---|
| Measurement Principle | Alkaline Potassium Persulfate Digestion with UV Absorption Spectrophotometry (220/275 nm) |
| Standard Measurement Range | 0.05 to 50.0 mg/L; 0.5 to 100.0 mg/L; 5.0 to 500.0 mg/L (Dynamic auto-dilution up to 2,000 mg/L) |
| Lower Detection Limit | ≤ 0.05 mg/L (Resolution: 0.001 mg/L) |
| Repeatability / Precision | Relative Standard Deviation (RSD) ≤ 3.0% |
| Digestion Temperature & Duration | 120°C to 125°C adjustable; 30 minutes cycle duration (Standard EPA/HJ636 compliance) |
| Zero / Span Drift | ±2.0% F.S. over 24-hour continuous run without user intervention |
| Calibration Mechanism | Autonomous programmable periodic dual-point standard calibration & automatic clean cycles |
| Analog & Digital Outputs | Dual isolated 4-20 mA outputs (load < 750 Ω), RS-485 Modbus RTU, Optional 4G IoT Gateway |
| Fluidic Control Subsystem | Multi-channel precision optical-drop peristaltic pump; high-purity micro-valve manifolds |
| Operating Environmental Limits | Process Water: 5°C to 45°C; Ambient: 5°C to 40°C; Relative Humidity: ≤ 85% non-condensing |
Frequently Asked Questions: Global Sourcing & System Integration
Direct answers from Boqu's senior instrumentation engineering team regarding specifications, integration, and field deployment.
How does an online TN Unit handle heavy suspended solids?
Total Nitrogen requires digestion of both particulate and dissolved nitrogen fractions. However, large abrasive sand or biological flocs can clog internal microfluidic tubes. Boqu provides an automated external self-cleaning backflush filter box with a 50–100 micron wedge-wire screen, ensuring a representative sample without clogging lines.
Can Boqu supply custom OEM configurations for system integrators?
Yes. Over 40% of our production volume supports private-label OEM partnerships. We deliver custom stainless steel or fiberglass enclosure branding, specialized boot screens, custom measuring spans, and tailored Modbus register maps that integrate smoothly into your parent software environment.
What is the typical shelf life and consumption rate of digestion reagents?
Under continuous 1-hour testing frequencies, a standard 2.5-liter reagent volume supports 30 to 45 days of unassisted operation. Reagents use standard lab chemicals (sodium hydroxide, potassium persulfate, hydrochloric acid) that can be prepared locally using standard recipes, avoiding costly proprietary chemical packs.
How do you address high chloride interference during UV digestion?
High chloride levels (above 1,000–2,000 mg/L) can interfere with persulfate oxidation and cause baseline shift at 220 nm. Boqu's advanced Total Nitrogen software incorporates dual-wavelength turbidity and chloride correction algorithms, alongside automated inline chemical masking reagents when required.
What international electrical and safety standards do your units satisfy?
All instrumentation built across our Kangqiao and Lingang factories complies with European CE standards (EN 61326-1 for EMC immunity and emissions; EN 61010-1 for electrical safety), maintains ISO 9001 and ISO 14001 factory traceability, and uses FDA-compliant materials for bioreactor-wetted sensors.
Integrated Online Multiparameter Platforms & Controllers
Combine your Total Nitrogen instrumentation with matching physical-chemical controllers and analyzers for complete outfall compliance.
DCA130 Dual Channel pH/EC
Dual parameter measurement on a single compact transmitter; ideal for intake monitoring stations.
MPG-6099Plus Skid Panel
Integrated backplate assembly combining up to 7 parameters with local data recording and telemetry.
pHG-2081Pro Process Analyzer
Rugged IP65 field-mount transmitter with dual 4-20 mA outputs and programmable alarm relays.
SJG-2083CS Concentration Unit
Inductive toroidal measuring technology designed for harsh acid/caustic recovery and CIP validation.
Continuous Chlorine Analyzer
Amperometric measurement cell with bare electrode mechanics and automated cleaning flow cell.
SWAS Silica & Phosphate Unit
Sub-ppb trace chemical monitoring for high-pressure power generation boilers and turbine steam lines.
TOC-3042 Carbon Monitor
Fast UV-persulfate oxidation method for total organic carbon in clean utilities and process effluent.
Total Nutrient Wet-Chem Platform
Comprehensive regulatory monitoring chassis configuring COD, TP, TN, Ammonia, and Heavy Metals.