YST Turbidimeter YST108B-NTU680T
| Brand | YST |
|---|---|
| Origin | Liaoning, China |
| Model | YST108B-NTU680T |
| Measurement Range | 0–1000 NTU |
| Accuracy | ±2% FS |
| Detection Principle | 90° Nephelometric Scattering (ISO 7027 Compliant) |
| Response Time | ≤10 s |
| Power Supply | AC 220 V / DC 24 V (wide-input) |
| Output Signals | 4–20 mA analog + RS485 (Modbus RTU) |
| Ingress Protection | IP65 |
| Operating Temperature | −10 °C to +50 °C |
| Relative Humidity | ≤85% RH (non-condensing) |
| Display | Backlit LCD with real-time NTU, temperature, calibration status, and power indicator |
Overview
The YST Turbidimeter YST108B-NTU680T is a field-deployable, ISO 7027-compliant nephelometric turbidimeter engineered for reliable, repeatable measurement of turbidity in natural waters, drinking water, wastewater, and industrial process streams. Based on the 90° scattered light detection principle, it quantifies suspended particulate matter by measuring the intensity of light scattered at right angles to the incident beam—ensuring high sensitivity across low-to-high turbidity ranges (0–1000 NTU). Designed for both fixed-installation and portable operation, the instrument meets the practical demands of municipal utilities, environmental monitoring agencies, and industrial effluent control programs where robustness, regulatory traceability, and operational simplicity are essential.
Key Features
- ISO 7027-certified optical design: Uses an infrared LED light source (850 nm) and precision 90° scattering geometry to minimize color interference and comply with international standard methodology for turbidity reporting in NTU units.
- Wide dynamic range & high reproducibility: Measures from 0.01 NTU (detection limit) up to 1000 NTU without manual range switching; calibrated accuracy of ±2% full scale ensures data consistency across routine QA/QC workflows.
- Dual power architecture: Supports universal input: AC 220 V (50/60 Hz) for permanent installations or DC 24 V (±15%) for battery-backed or solar-powered remote deployments.
- Industrial-grade environmental resilience: IP65-rated enclosure withstands dust ingress and water jets—validated for outdoor mounting on intake channels, filter effluent pipes, or open-channel discharge points.
- Real-time onboard diagnostics: Integrated temperature sensor enables automatic thermal compensation; LCD display shows live NTU value, measured temperature, calibration timestamp, signal stability indicator, and power status—no external software required for basic operation.
- One-touch calibration protocol: Supports single-point (e.g., 20 NTU formazin standard) or multi-point calibration routines with non-volatile memory storage of calibration coefficients and date/time stamps.
Sample Compatibility & Compliance
The YST108B-NTU680T is validated for use with clarified potable water, surface water, treated wastewater, and pre-filtered industrial process streams. It is not intended for highly colored, viscous, or air-entrained samples without prior filtration or degassing. The instrument’s optical path is optimized for aqueous matrices meeting ASTM D6508 and ISO 7027 requirements. While not certified to FDA 21 CFR Part 11 out-of-the-box, its Modbus-enabled digital output and audit-ready calibration logs support integration into GLP/GMP-compliant data acquisition systems when paired with validated SCADA or LIMS platforms. All factory calibrations are traceable to NIST-traceable formazin standards.
Software & Data Management
Data output is delivered via two parallel interfaces: a 4–20 mA current loop (HART-compatible) for analog integration into PLC-based control systems, and an isolated RS485 port implementing Modbus RTU protocol (addressable, configurable baud rate: 9600–115200 bps). This dual-output architecture enables simultaneous connection to local HMIs and centralized telemetry networks. Calibration history—including date, operator ID (manually entered), standard used, and deviation from reference—is stored in non-volatile memory and retrievable via serial command. No proprietary software is required; standard Modbus master tools (e.g., QModMaster, ModScan) or custom SCADA drivers can poll real-time values and event logs. Firmware updates are performed via UART interface using documented ASCII command sets.
Applications
- Drinking water treatment: Continuous monitoring of raw intake, flocculation basin effluent, filter backwash clarity, and finished water compliance—supporting rapid response to coagulant dosage adjustments during storm events.
- Wastewater discharge compliance: Fixed-mount installation at plant outfalls to meet national effluent limits (e.g., China’s GB 8978–1996, EU Urban Wastewater Directive); supports automated alarm triggers upon threshold exceedance.
- Environmental field surveys: Battery-operated handheld mode enables rapid grab sampling in rivers, reservoirs, and wetlands—eliminating lab transport delays while maintaining inter-site comparability under variable ambient lighting.
- Industrial process control: Integration into cooling tower blowdown loops, boiler feedwater pretreatment, or food/beverage rinse water lines to detect particulate breakthrough or filter integrity failure.
FAQ
Does the YST108B-NTU680T require annual recalibration?
Calibration frequency depends on application severity and regulatory requirements. For fixed installations in stable environments, quarterly verification against certified standards is recommended; for field use with frequent handling, daily zero-check and weekly span verification are advised per ISO 7027 Annex B.
Can the device measure turbidity in seawater or brackish water?
Yes—provided salinity-induced refractive index shifts are compensated. The built-in temperature sensor provides baseline correction; however, for salinities >10 g/L, empirical calibration using marine-grade standards (e.g., AMCO AEPA) is recommended.
Is the optical window self-cleaning or anti-fouling?
No. The quartz sensing window requires periodic manual cleaning with lint-free cloth and isopropyl alcohol. Optional wiper kits or ultrasonic cleaning modules may be integrated externally but are not included as standard.
What is the minimum sample volume required for accurate measurement?
As a flow-through or immersion probe design, it does not require discrete sample volumes. When used in bypass mode with a sample pump and flow cell, minimum flow rate is 100 mL/min; in direct immersion mode, full submersion of the sensor head (≥5 cm depth) is sufficient.
How is long-term drift managed in unattended deployments?
The instrument includes automatic zero-drift compensation during idle periods (if powered continuously) and stores baseline offset values. Field validation with clean-water blanks every 72 hours is recommended for critical compliance applications.
