China Turbidity Measurement Factory & Factories

The primary divergence rests in the illumination wavelength and photodetector optics. The ISO 7027 European standard specifies an 860 nm Near-Infrared LED light source with an optical bandwidth of ±30 nm, which prevents color absorption in dyed water or humic acid matrices from attenuating the beam. Conversely, USEPA 180.1 mandates a tungsten-filament incandescent lamp operating between 400 nm and 680 nm (color temperature 2200 to 3000 K). While EPA 180.1 provides exceptional sensitivity to extremely minute sub-micron particles in clean treated drinking water, tungsten filaments degrade more rapidly and show vulnerability to dissolved color. As a premier Chinese manufacturer, BOQU provides both 860nm NIR optical systems for zero-color interference and specialized tungsten systems designed for domestic and international regulatory compliance.

Yes, through rigorous empirical field calibration. While turbidity measures the scattering of light caused by suspended particles (expressed in NTU or FNU), TSS measures actual dry particulate mass per unit volume (expressed in mg/L or ppm). Because optical scattering is influenced by particle size distribution, morphology, color, and refractive index, an online turbidity analyzer requires a site-specific calibration curve. BOQU ZDYG series sensors feature internal multi-point polynomial linearization that allows plant engineers to input standard gravimetric oven-drying results (e.g., Standard Methods 2540D) to create a direct real-time correlation between NTU and TSS, enabling immediate sludge retention control without waiting 24 hours for lab filtering.

Industrial sewage and activated aeration basins rapidly develop organic biofilms and lime coatings over optical windows. BOQU turbidity probes resolve this through a three-tier defense system: First, our optical windows utilize synthetic sapphire crystals polished to optical grade, which possess high mechanical hardness and prevent scratching from grit. Second, our sensors feature integrated programmable mechanical silicone wipers that sweep the lenses automatically at user-defined intervals (e.g., every 30 minutes). Third, for high-grease oily wastewater where mechanical wiping may smear residues, we supply air-purge or ultrasonic cavitation cleaning attachments that blast micro-bubbles across the sensing face to maintain zero drift over months of unattended continuous operation.

BOQU designs instruments with versatile interoperability. Our dedicated transceivers provide dual galvanically isolated 4-20 mA analog outputs (configurable for turbidity and process temperature) alongside programmable SPDT high/low alarm relays for dosing pump control. Furthermore, every smart digital sensor features direct native RS485 Modbus RTU communication running on standard baud rates (9600 to 115200 bps), allowing multiple sensors to be daisy-chained over distances up to 1200 meters into Siemens, Allen-Bradley, or Schneider PLCs without requiring intermediary analog-to-digital transmitter hubs. Optional industrial gateways enable direct conversion to Profibus-DP, Modbus TCP, PROFINET, or wireless 4G/NB-IoT cloud interfaces.

Shanghai BOQU Instrument Co., Ltd. is a verified high-tech manufacturer founded in 2007. Operating two company-owned manufacturing plants located in Kangqiao Town and the Lingang Free Trade Zone in Pudong, Shanghai, BOQU manages the complete lifecycle of its products: from glass electrode blowing, photometric optical assembly, surface-mount technology (SMT) electronic placement, firmware coding, and precision calibration in dedicated high-temperature and optical laboratories. With over 200 staff, 4,632 square meters of production floorspace, and an output exceeding 100,000 analytical instruments per annum, BOQU provides transparent factory audits, virtual VR tours, and direct access to engineering teams for custom OEM/ODM modifications.