China Inline Turbidity Sensor Manufacturer & Factories

BOQU Instrument is an authentic, independent industrial sensor and analyzer manufacturer founded in 2007 in Pudong, Shanghai. Our operations span two state-of-the-art facilities located in Kangqiao Town and Lingang Special Area, covering an aggregated floor area of 4,632 square meters. Our campus houses dedicated optical sensor assembly lines, precision CNC machining, SMT electronic circuit manufacturing, and a 48-hour continuous sensor burn-in laboratory. We employ over 200 staff, with over 35 dedicated R&D hardware, optical, and firmware engineers, generating an annual manufacturing output in excess of 100,000 instruments worldwide.

The 90-degree scattered light principle (governed by ISO 7027 and EPA 180.1) is the recognized global standard for clean, potable, and moderate-turbidity water ranging from 0.001 to 4,000 NTU/FNU. It captures single-particle scattering dynamics with optimal linearity. In contrast, in highly dense suspensions, sludge settling basins, or return activated sludge (RAS) lines where particle density causes multiple-scatter attenuation, light cannot easily penetrate to a 90-degree detector. In these applications (typically > 4,000 NTU up to 100 g/L TSS), 135-degree backscatter optics capture light immediately reflected near the probe surface, enabling accurate, unblinded measurements without saturation.

Micro-air bubbles act as optical reflectors and can distort turbidity measurements upward. BOQU engineers address this using a three-tier mitigation system: First, our optional inline debubbler flow cell uses cyclonic flow and atmospheric degassing baffles to release entrained gases prior to optical presentation. Second, the digital sensor firmware features an intelligent impulse spike filtering algorithm that analyzes signal transients—micro-bubbles create sharp, narrow spikes, which the firmware discards while preserving true suspended solids baseline trends. Third, probes installed directly in pressurized lines are angled at 45 degrees into the flow vectors, sweeping bubbles away from the optical window continuously.

Yes. BOQU's IOT and digital sensor series (such as the ZDYG-2088-01QX and IOT-485 series) feature integrated smart microprocessors inside the probe body. They output standard RS485 Modbus RTU signals directly over industrial shielded cables. You can wire the sensor straight to PLC RS485 communication cards, DCS input modules, SCADA servers, or wireless IoT cloud telemetry units without needing a local wall-mounted display transmitter. Calibration curves and addressing parameters are retained directly in internal non-volatile probe memory.

Our manufacturing plant operates under certified ISO 9001 (Quality Management) and ISO 14001 (Environmental Management) standards. Our instruments hold CE marks for EMC immunity and Low Voltage Directives, SGS audited manufacturer credentials, and RoHS lead-free compliance. For specialized lines, our sanitary food and pharmaceutical sensors feature FDA-compliant elastomer seals (USP Class VI compliant), and our pH5806 high-temperature sensor holds the prestigious Shanghai Brand certification for engineering excellence.

To help our engineering team calculate the exact optical path length and flow cell configuration for your application, please provide: 1) Measuring parameter and anticipated dynamic range (e.g., 0-20 NTU drinking water vs. 0-10,000 mg/L MLSS); 2) Process medium properties (pH range, chemical content, corrosiveness, presence of oil/grease); 3) Process temperature and operating line pressure; 4) Mechanical mounting preference (submersible bracket, inline pipe flange, bypass flow chamber, or retractable insertion valve); and 5) Output requirements (RS485 Modbus RTU, 4-20mA, or alarm relay contacts).