YST108B-NTU680T Online Turbidimeter
| Brand | YST (Dalian Yist) |
|---|---|
| Origin | Liaoning, China |
| Model | YST108B-NTU680T |
| Measurement Range | 0–1000 NTU |
| Accuracy | ±2.5% FS |
| Light Source | Infrared LED (Lifespan >100,000 h) |
| Response Time | ≤30 s (to 90% of full-scale change) |
| Operating Temperature | −25 °C to +70 °C |
| Relative Humidity | 0–90% RH (non-condensing) |
| Sensor IP Rating | IP67 |
| Enclosure IP Rating | IP54 |
| Output Signals | Isolated 4–20 mA analog output |
| Power Supply | AC 220 V ±10%, 50/60 Hz |
| Cleaning Mechanism | Motor-driven wiper with programmable automatic cleaning cycle |
Overview
The YST108B-NTU680T Online Turbidimeter is an industrial-grade, real-time turbidity monitoring instrument engineered for continuous operation in municipal drinking water distribution, wastewater treatment effluent channels, food & beverage process streams, and industrial cooling water circuits. It operates on the principle of dual-path optical detection—simultaneously measuring both scattered and transmitted light intensity at 90° and 0° angles relative to the incident infrared beam. This dual-signal architecture enables robust compensation for color interference, bubble artifacts, and sensor window fouling—significantly improving measurement stability under variable flow conditions and heterogeneous particulate loads. The device conforms to the fundamental optical principles defined in ISO 7027-1:2016 (optical method using infrared light) and supports traceable calibration against formazin or polymer-based NTU standards. Its fully integrated, inline probe-and-transmitter architecture eliminates the need for sample extraction or bypass loops, reducing maintenance overhead and minimizing hydraulic disruption.
Key Features
- Dual-Optical Path Detection: Independent scatter and transmission photodiodes enable dynamic signal ratioing, mitigating drift caused by aging light sources or gradual optical surface contamination.
- Infrared LED Light Source: 850 nm wavelength minimizes interference from natural water coloration and organic chromophores while ensuring >100,000 h operational lifetime under continuous duty.
- Programmable Automatic Wiper System: Stainless-steel blade actuated via stepper motor cleans the optical window at user-defined intervals (e.g., every 1–24 hours), maintaining long-term signal fidelity without manual intervention.
- Real-Time Thermal Compensation: Integrated Pt100 temperature sensor feeds data to embedded algorithm that dynamically adjusts gain and offset parameters, reducing thermal-induced error to <0.1 NTU/°C across the full operating range.
- Industrial-Rated Enclosures: Probe housing constructed from 316L stainless steel with IP67 ingress protection; transmitter enclosure rated IP54 for wall- or panel-mount deployment in humid or dusty environments.
- Multi-Protocol Digital Interface: RS485 port implements standard Modbus RTU protocol (slave ID, baud rate, parity configurable), enabling seamless integration with PLCs, DCS, and SCADA platforms compliant with IEC 61131-3 and ISA-88 architectures.
Sample Compatibility & Compliance
The YST108B-NTU680T is validated for use with potable water, clarified wastewater, process rinse water, and low-viscosity industrial coolants. It is not recommended for highly abrasive slurries (>50 ppm sand), viscous emulsions, or fluids containing suspended oil droplets >10 µm diameter due to potential Mie scattering deviation. The instrument meets electromagnetic compatibility requirements per EN 61326-1:2013 (industrial environment) and safety compliance per EN 61010-1:2010. While not certified to UL 61010-1 or ATEX, its design aligns with functional safety concepts referenced in IEC 61511 for SIL 1-rated monitoring applications. Calibration traceability follows ISO/IEC 17025 guidelines when performed using NIST-traceable formazin reference standards (e.g., StablCal® or equivalent).
Software & Data Management
The device operates autonomously without external software dependency. All configuration—including zero/span calibration, cleaning schedule, analog output scaling, and alarm thresholds—is performed locally via a backlit 4-button keypad and 128×64 graphical LCD display with Chinese-language menu navigation. For centralized oversight, the Modbus RTU interface supports readout of primary turbidity value (register 40001), temperature (40002), cleaning status flag (40003), diagnostic codes (40004), and accumulated runtime hours (40005). When integrated into supervisory systems, historical data can be logged in accordance with 21 CFR Part 11-compliant audit trails if hosted on validated server infrastructure. No cloud connectivity or proprietary firmware updates are implemented—ensuring deterministic behavior and long-term validation stability required in regulated QA/QC environments.
Applications
- Municipal Water Treatment: Continuous monitoring at sedimentation basin effluent, filtration backwash recovery lines, and finished water storage tank outlets to verify compliance with WHO and GB 5749-2022 turbidity limits (<1.0 NTU for treated drinking water).
- Food & Beverage Production: Real-time control of coagulant dosing in wastewater equalization tanks; verification of membrane filter integrity in CIP rinse cycles; and post-carbon filtration verification in bottling line final rinse water.
- Industrial Cooling Systems: Early detection of microbiological growth (e.g., biofilm shedding) or corrosion product release in closed-loop recirculating systems, supporting predictive maintenance scheduling per ISO 55001 asset management frameworks.
- Pharmaceutical Utilities: Monitoring of purified water (PW) and water-for-injection (WFI) distribution loop return points where turbidity excursions may indicate membrane breach or valve leakage—supporting ALCOA+ data integrity principles.
FAQ
What calibration standards are compatible with the YST108B-NTU680T?
Formazin suspension (primary standard per ISO 7027), StablCal® polymer standards, or commercially available NTU-certified calibration kits with documented uncertainty <±0.5 NTU.
Can the device operate in pressurized pipelines?
Yes—the probe is rated for continuous service up to 10 bar (145 psi) at 25 °C; pressure rating decreases linearly to 6 bar at 70 °C per ASME B16.5 flange class 150 specifications.
Is the analog output intrinsically safe?
No—the 4–20 mA output is non-isolated from internal power supply; for hazardous area installation, an externally mounted HART or galvanic isolator must be used per IEC 60079-11.
How often does the wiper require replacement?
The PTFE-coated stainless-steel wiper blade is specified for ≥50,000 cleaning cycles; typical field replacement interval is 18–24 months under daily automated cleaning at 6-hour intervals.
Does the unit support remote firmware updates?
No—firmware is stored in write-protected flash memory; version verification and checksum validation occur at boot time to ensure execution integrity, consistent with GAMP 5 Category 3 software classification.
