YST Ultrasonic Open-Channel Flow Meter YST940M-3CY10

Overview

The YST Ultrasonic Open-Channel Flow Meter YST940M-3CY10 is an industrial-grade, non-invasive flow monitoring solution engineered for long-term deployment in unlined or concrete-lined irrigation canals, drainage ditches, and wastewater effluent channels. It operates on the ultrasonic time-of-flight (TOF) principle: two transducers mounted above the channel surface emit and receive high-frequency acoustic pulses across the flow cross-section. By precisely measuring the transit time difference between upstream and downstream signals—and integrating real-time water level data from the same sensor array—the device computes average velocity and, using pre-configured channel geometry (e.g., rectangular, trapezoidal, or Palmer-Bowlus flume), calculates volumetric flow rate in accordance with ISO 4359 and ASTM D5388 standards for open-channel hydrometry. Designed specifically for agricultural water management, it delivers traceable, maintenance-light performance under variable sediment load, fluctuating water clarity, and wide ambient temperature swings—conditions typical of field-deployed irrigation infrastructure.

Key Features

• True non-contact measurement: No submerged components; eliminates mechanical wear, biofouling, and flow disturbance caused by intrusive sensors or weirs.
• Multi-geometry channel support: Configurable for standard hydraulic structures including rectangular weirs, Cipolletti (trapezoidal) weirs, Palmer-Bowlus flumes, and custom channel cross-sections via embedded geometric coefficient tables.
• Ruggedized dual-environment design: IP68-rated ultrasonic transducer housing withstands prolonged submersion and abrasive silt exposure; IP65-rated transmitter enclosure resists UV degradation, rain, dust, and thermal cycling across −20 °C to +60 °C operational range.
• Dual-power flexibility: Field-deployable with either AC 220 V mains or DC 24 V auxiliary supply—enabling integration into solar-powered telemetry nodes or existing SCADA power rails.
• Embedded data integrity architecture: Local storage buffers ≥8,760 timestamped records (1 per hour for 1 year); all entries include checksum validation, write-cycle logging, and automatic overwrite protection to prevent data corruption.

Sample Compatibility & Compliance

The YST940M-3CY10 is validated for use with natural and engineered open channels carrying freshwater, reclaimed irrigation return flow, and low-turbidity wastewater—provided suspended solids concentration remains below 10,000 mg/L and surface foam or heavy floating debris is periodically cleared from the acoustic path. It complies with electromagnetic compatibility requirements per IEC 61326-1 (industrial environment), meets CE marking directives for measurement instrumentation, and supports audit-ready data handling aligned with GLP principles: all configuration changes, calibration events, and manual overrides are logged with timestamps and user identifiers (where enabled via external authentication). While not certified to UL 61010-1 or ATEX for hazardous locations, its intrinsic safety profile—zero submerged electronics, no spark-prone components—makes it suitable for Class I, Division 2 environments when installed per NEC Article 501 guidelines.

Software & Data Management

The device includes a built-in 3.5-inch monochrome LCD interface with tactile membrane keys for local commissioning, real-time diagnostics (signal strength, SNR, echo quality), and manual zero-level calibration. Configuration and historical data retrieval are performed via Modbus RTU over RS485 using industry-standard tools (e.g., ModScan, QGIS + Python pyModbus scripts) or proprietary YST FlowConfig utility (Windows/macOS). All stored records include UTC timestamps, raw TOF values, compensated velocity, measured level, computed flow, and diagnostic flags. Data export supports CSV format via USB-C port or RS485 bulk transfer—enabling direct ingestion into irrigation scheduling platforms (e.g., CropX, IrriWatch), GIS-based water accounting systems, or regulatory reporting modules compliant with China’s GB/T 28714-2012 and international ISO 14046 water footprint frameworks.

Applications

• Real-time allocation monitoring across primary, secondary, and tertiary irrigation canals in gravity-fed and pump-lift systems.
• Performance verification of water-saving interventions (e.g., lining, laser leveling, drip conversion) through longitudinal flow trend analysis.
• Automated gate control feedback loops where flow deviation triggers actuator response via relay outputs.
• Water user association (WUA) billing and equity assessment, supporting volumetric pricing models based on verifiable consumption logs.
• Regulatory compliance reporting for basin-level water abstraction permits and drought contingency plans.

FAQ

Does the YST940M-3CY10 require channel modification or stilling wells for installation?
No. It mounts externally on existing channel walls or overhead gantries using adjustable stainless-steel brackets—no excavation, concrete cutting, or flow interruption is needed.

Can it operate reliably in high-silt or algae-rich water?
Yes. Since measurement occurs above the water surface, turbidity, sediment suspension, and algal scum do not affect acoustic coupling or sensor integrity—unlike submersible Doppler or magnetic flow meters.

Is firmware upgradable in-field?
Yes. Firmware updates are delivered via USB flash drive or Modbus register upload, preserving all site-specific geometry tables and calibration history during version transitions.

What documentation is provided for regulatory audits?
Each unit ships with a factory calibration certificate (traceable to CNAS-accredited reference standards), full electrical safety test report, and a configurable audit log template compatible with ISO/IEC 17025 laboratory quality management systems.