YST Ultrasonic Flow Meter YST305D20BF223 – DN200 Clamp-on Style (Pipe Section Type)

Overview

The YST Ultrasonic Flow Meter YST305D20BF223 is a pipe-section-type (inline) transit-time ultrasonic flowmeter engineered for high-accuracy, non-intrusive volumetric flow measurement of liquids in industrial and municipal infrastructure applications. Unlike clamp-on variants, this model integrates the transducer pair directly into a precision-machined DN200 flow tube, ensuring optimal acoustic coupling, minimal signal attenuation, and long-term stability under variable hydraulic conditions. The device operates on the principle of transit-time difference measurement: two ultrasonic transducers alternately transmit and receive high-frequency sound pulses across the flowing medium at an oblique angle; the time differential between upstream and downstream propagation is linearly proportional to the average axial velocity of the fluid. This velocity—combined with the known cross-sectional area of the DN200 pipe—is used to compute volumetric flow rate in real time. Designed for permanent installation in pressurized piping systems, the YST305D20BF223 eliminates the need for pipe cutting or process shutdown during commissioning, making it ideal for retrofit projects in water distribution networks, HVAC circulation loops, and chemical process lines where operational continuity is critical.

Key Features

• Pipe-integrated transit-time architecture: Full DN200 flow tube with factory-aligned, epoxy-bonded piezoelectric transducers ensures consistent beam path geometry and eliminates field calibration drift due to misalignment or coupling degradation.
• Wide dynamic flow range: Supports measurement from 0.1 m/s to 10.0 m/s (22–1100 m³/h), accommodating low-flow monitoring and high-capacity transmission without range switching or recalibration.
• Robust mechanical design: Flow body constructed from carbon steel (standard) or optional stainless steel (304/316), rated for continuous operation up to 1.6 MPa and ambient temperatures from −25 °C to +60 °C—suitable for outdoor meter pits, pump stations, and industrial utility corridors.
• Dual-output interface: Simultaneous 4–20 mA analog output (HART-compatible upon request) and RS485 serial interface with Modbus RTU protocol enable seamless integration with PLCs, SCADA systems, and DCS platforms without additional signal conditioning hardware.
• Local human-machine interface (HMI): Backlit monochrome LCD display shows real-time instantaneous flow, totalized volume, fluid temperature (via integrated Pt100 sensor), and diagnostic status—supporting on-site verification and basic parameter configuration via membrane keypad.
• Maintenance-free operation: No moving parts, no pressure drop, and no wetted electronics ensure long service intervals; routine verification requires only periodic inspection of transducer integrity and zero-check under static conditions.

Sample Compatibility & Compliance

The YST305D20BF223 is validated for clean to moderately suspended liquid media, including potable water, wastewater (with <5% solids by volume), chilled/heating water, glycol solutions, and industrial process coolants. It is not intended for gases, steam, or highly aerated or viscous fluids (>100 cP). While the device does not carry CE, UKCA, or UL certification out-of-the-box, its electrical and mechanical design conforms to baseline requirements of IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emission), and its pressure boundary complies with ISO 10771:2019 for ultrasonic flowmeters. For regulated environments—including water utilities subject to ISO 4064-1:2014 or ANSI/AWWA C705—system-level validation (including traceable calibration against a master meter per ISO 17025-accredited laboratory) is required prior to revenue-grade deployment. The unit supports audit-ready data logging when paired with external controllers compliant with FDA 21 CFR Part 11 and GLP/GMP documentation standards.

Software & Data Management

Configuration and diagnostics are performed locally via the onboard HMI or remotely using YST’s proprietary PC-based configuration tool (YST-Config v3.2), which runs on Windows 10/11 and communicates over RS485 or USB-to-RS485 adapter. The tool enables full access to all operational parameters—including damping time, flow direction lock, pulse output scaling, and alarm thresholds—as well as real-time waveform visualization of received ultrasonic signals. All configuration changes are timestamped and stored in non-volatile memory. When connected to a supervisory system, the flowmeter can transmit primary flow values, accumulated totals, temperature readings, and self-diagnostic flags (e.g., signal strength, transducer fault, low battery for optional backup power). Optional firmware upgrades—distributed as signed binary packages—maintain backward compatibility and introduce enhanced noise rejection algorithms for pulsating or turbulent flow profiles.

Applications

• Municipal water supply monitoring: Permanent installation on DN200 trunk mains for district metering areas (DMAs), enabling leakage detection through night-flow analysis and pressure-dependent demand modeling.
• Industrial cooling water circuits: Continuous flow verification in open- or closed-loop heat exchanger systems, supporting predictive maintenance of pumps and chillers based on deviation from thermal balance models.
• Energy management in HVAC plants: Integration with building automation systems (BAS) to correlate chilled water flow with energy consumption (kW/ton), supporting ASHRAE Guideline 36-compliant optimization strategies.
• Process water allocation in manufacturing: Allocation tracking across production lines (e.g., plating, food processing), feeding into MES-level resource utilization dashboards aligned with ISO 50001 energy management frameworks.
• Wastewater treatment plant influent/effluent monitoring: Robust performance in biologically active or chemically dosed streams, provided suspended solids concentration remains below threshold limits affecting acoustic transmission.

FAQ

Is the YST305D20BF223 suitable for custody transfer applications?
No—this model is classified as a Class 1.0 or Class 1.5 accuracy instrument per ISO 4064 and is intended for utility monitoring, process control, and energy accounting—not fiscal metering requiring Class 0.5 or higher certification.

Can the flowmeter be installed vertically or horizontally?
Yes—orientation is unrestricted, but the transducer mounting plane must remain perpendicular to the pipe axis, and full-pipe conditions must be maintained at all times; air pockets or partial filling will compromise measurement validity.

What is the minimum upstream/downstream straight pipe requirement?
For optimal profile development, install with ≥10D upstream and ≥5D downstream straight run; if space-constrained, a single long-radius elbow (R≥1.5D) upstream is acceptable, though calibration correction may be advised.

Does the device support temperature-compensated density correction for non-water fluids?
No—the internal algorithm assumes water-like acoustic properties; for non-aqueous liquids, field calibration using a reference standard is mandatory to establish a custom K-factor.

How often should the unit undergo verification?
Annual verification against a traceable master meter is recommended for critical applications; for non-regulated use, visual inspection and signal quality check every 6 months suffice.