Featured Industrial Optical & Electrochemical Probes
Direct-from-manufacturer intelligent online sensors engineered for process integration, SCADA telemetry, and severe industrial liquid monitoring.
Optical Transparency Sensing: Principles & Industry Trends
Why the global transition toward real-time RS485 Modbus-RTU optical clarity sensors is rendering manual Secchi disk and intermittent laboratory gravimetric testing obsolete.
Modern digital transparency sensors utilize near-infrared (NIR 860nm) LEDs coupled with 90° nephelometric scattered-light and 180° light transmission detection. This dual-beam optical geometry compensates instantaneously for sample fluid color interference, ambient solar irradiation, and bubble formation, ensuring precise NTU and Secchi-depth equivalent readings.
By moving signal digitization, temperature compensation, and calibration look-up tables directly onto an embedded PCB micro-controller inside the probe head, our sensors transmit differential RS485 signals over cable distances up to 1,200 meters. This eliminates micro-volt cable drift, EM interference from nearby VFDs, and costly external transmitters.
Biological biofilm formation and mineral sedimentation represent over 85% of field failure modes in continuous immersion applications. BOQU's intelligent transparency probes feature magnetic coupling automatic cleaning wipers and fluorocarbon-sealed mechanical drives that clear optical sapphire lenses prior to each measurement cycle.
China Factory 4.0: Supply Chain Resilience & Efficiency
How Shanghai BOQU Instrument leverages vertical integration, automated optical calibration lines, and Shanghai's high-tech manufacturing ecosystem to deliver unmatched reliability at direct factory economics.
Unlike trading assemblers that outsource sub-modules, BOQU controls the full manufacturing hierarchy across our twin Shanghai facilities in Kangqiao and Lingang. From CNC precision turning of 316L stainless steel and titanium housings, in-house SMT surface mount electronics assembly, to hermetic sapphire window optical bonding, every physical step happens under continuous MES (Manufacturing Execution System) monitoring.
This closed-loop production architecture insulates global clients against international supply chain volatility, shortens lead times for custom orders to under 10 business days, and ensures that every firmware revision undergoes regression testing against international Modbus RTU standards.
Every single optical transparency sensor undergoes full thermal cycling in our environmental chambers followed by 48 consecutive hours of continuous immersion testing. Sensors are calibrated in multi-point Formazin primary standards traceable to NIST and Chinese National Metrology benchmarks.
The result is instrument repeatability of <1%, linearity across 0–4000 NTU (or 0–100 cm transparency), and field survival lifetimes exceeding 5 years in aggressive municipal and industrial effluent environments.
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China Transparency Sensor RS485 Pricelist (2025–2026)
Transparent tiered pricing structure for system integrators, municipal water utilities, and OEM distributors. All units include Modbus-RTU protocol manuals and calibration certificates.
| Model Series | Core Measurement Principle | Material & Ingress | Sample Range | MOQ 1–10 Units | MOQ 11–50 Units | MOQ 50+ (OEM) |
|---|---|---|---|---|---|---|
| ZDYG-2088-01QX (Flagship) | 860nm NIR Transmission + Auto Wiper | 316L SS / POM, IP68 | 0-100 cm Clarity / 0-4000 NTU | $380 – $460 | $310 – $360 | Inquire for OEM |
| ZDYG-Mini-485 (Compact) | 90° Nephelometric Micro-Optics | Anodized Aluminum / POM | 0-200 NTU (Drinking Water) | $220 – $280 | $170 – $210 | Inquire for OEM |
| IOT-485-TSS (Heavy Sludge) | Dual-Beam Attenuation Infrared | Titanium / Sapphire Window | 0-20,000 mg/L MLSS | $520 – $650 | $440 – $510 | Inquire for OEM |
| pH5806 (High-Temp) | Gel Reference Double Junction | Corning Glass / PG13.5 | 0-14 pH, 0-130 ℃ | $140 – $190 | $110 – $135 | Inquire for OEM |
| DCA130 Dual Channel | Transmitter & Display Controller | ABS NEMA 4X / IP65 | Dual pH + EC / Turbidity | $290 – $360 | $230 – $275 | Inquire for OEM |
Standard sensors ship with POM or 316L stainless steel. For high-salinity marine environments, desalination intake bays, or concentrated acid/caustic streams, Titanium Grade 2 or Hastelloy C-276 wetted bodies are available upon engineering request.
Factory stock probes include 10 meters of PUR shielded, low-noise submersible cable. Extensions up to 100 meters, Kevlar tensile reinforcement cores, and steel-armored conduits can be configured without communication integrity loss.
For controls manufacturers, we offer private labeling, custom laser-etched serial numbers, pre-set Slave IDs, custom baud rates (4800 to 115200 bps), and proprietary register maps to seamlessly drop into your PLC product ecosystem.
Engineered for Global Environmental & Industrial Challenges
Proven installations operating across 5 continents under severe chemical, biological, and thermal operating envelopes.
Industrial park wastewater treatment facilities in northern Vietnam rely on BOQU RS485 transparency and TSS sensors to meet stringent QCVN 40:2011/BTNMT Class A standards. Automatic wipers eliminate textile dye build-up, enabling continuous 24/7 compliance reporting.
Recirculating Aquaculture Systems (RAS) culturing flounder and sea cucumber maintain strict photoperiod and suspended solids control. Digital clarity sensors provide real-time feed waste tracking, cutting biofilter loading and aerator power consumption by 22%.
Integrated into solar-powered IoT monitoring buoys across municipal runoff canals, low-power RS485 Modbus transparency probes report silt intrusion and sediment transport directly to cloud SCADA nodes via 4G-LTE telemetry.
Pharmaceutical fermentation tanks utilize BOQU steam-sterilizable probes and turbidity cut-off sensors to automate harvest timing. Real-time clarity measurements replace manual sample draws, preventing batch contamination risks.
Standard RS485 Modbus-RTU Communication Specification
Native industrial bus protocol parameters for seamless communication with Siemens, Schneider, Rockwell Allen-Bradley, and open-source IoT gateways.
- Power Supply: 12–24V DC ±10%, power surge protection to 2kV
- Power Consumption: <0.5W standard; <2.5W during auto-wiper motor sweep
- Interface: Two-wire RS485 half-duplex differential bus
- Data Formats: 9600 bps (default, configurable 4800–115200), 8 Data bits, 1 Stop bit, None parity
- Submersible Depth: IP68 rated to 10 meters continuous hydraulic pressure
- Operating Medium: 0 to 60℃ (<0.4 MPa static pressure)
- Register 0x0000: Transparency / Water Clarity Value (Float ABCD, Unit: cm)
- Register 0x0002: Turbidity Primary Measurement (Float ABCD, Unit: NTU)
- Register 0x0004: Process Temperature (Float ABCD, Unit: °C)
- Register 0x0006: Sensor Diagnostic & Wiper Fault Code (Unsigned Int 16)
- Holding Register 0x0100: Wiper Sweep Interval Trigger (Write 06H, Unit: Minutes)
- Holding Register 0x0102: Slave Station Address (1–247 configurable)
Frequently Asked Questions for Overseas Procurement
Detailed technical and commercial answers directly from our export application engineering department.
BOQU is a direct manufacturer. Founded in 2007 in Pudong, Shanghai, we operate two manufacturing plants in Kangqiao and Lingang covering 4,632 m² of workshop space with over 200 employees, in-house optical laboratories, and automated SMT production facilities.
Turbidity measures the scattered light intensity from suspended colloids according to ISO 7027 (in NTU/FNU). Transparency (measured in centimeters of visibility) corresponds directly to the visual depth of water clarity. Our sensors feature internal empirical algorithm matrices that output both NTU and cm transparency simultaneously via Modbus.
Due to the stability of 860nm NIR solid-state LED emitters and integrated baseline compensation, BOQU optical probes exhibit minimal drift (<1% full scale per year). Under normal operating conditions without severe chemical coating, routine verification every 6 to 12 months in zero-turbidity DI water and Formazin standard solution is sufficient.
The wiper is fabricated from silicone rubber resistant to acids, alkalis, and oil films. Users can configure the wipe interval (e.g., every 30, 60, or 120 minutes) via Modbus register 0x0100. The wiper rotates 360 degrees to scrape optical windows clean before returning to its shielded park position away from the optical path.
Yes. Because our sensors integrate internal microprocessors that handle signal amplification, A/D conversion, and Modbus-RTU stack execution, you can wire the RS485 A/B lines and 12–24V DC directly to your PLC, SCADA, RTU, or IoT cellular edge gateway, saving hundreds of dollars per monitoring station.
Our facilities and products operate strictly under ISO 9001 Quality Management and ISO 14001 Environmental Management Systems. All export sensors carry CE compliance marks (EN 61326-1 EMC industrial immunity), RoHS compliance, and SGS audited inspection credentials.
Standard configurations (up to 50 units) ship within 5 to 7 business days from our Shanghai warehouse. Bulk orders or customized OEM requests typically require 10 to 14 days. We partner directly with DHL, FedEx, UPS air express (3–5 days door-to-door worldwide) and provide sea freight for project panels.
Yes. Backed by our dedicated firmware R&D engineering division, we can deliver custom baud configurations, ASCII string outputs, customized parity bits, or proprietary Modbus register structures to maintain backward compatibility with your legacy control installations.
Explore Allied Online Analyzers & Process Transmitters
Seamlessly pair your transparency probes with multi-parameter controllers, high-temperature electrodes, and trace chemistry analyzers built in Shanghai.
Need a Customized Transparency Sensor Configuration?
Contact BOQU application engineers for customized wetted materials, extended cable lengths, private label branding, and formal wholesale price quotations.