YST Ultrasonic Flow Meter Model YST305D150BF223 – DN150 Clamp-on Style (Pipe Section Type)
| Brand | YST |
|---|---|
| Origin | Liaoning, China |
| Model | YST305D150BF223 |
| Nominal Diameter | DN150 (150 mm) |
| Pressure Rating | PN 1.0 / 1.6 MPa (customizable to 2.5 MPa) |
| Accuracy Class | Class 2 (Q₃ ≤ Q ≤ Q₄), Class 3 (Q₁ ≤ Q < Q₃) |
| Turndown Ratio | 1:100 (Q₁ = 0.03 m³/h, Q₄ = 3 m³/h) or 1:200 (Q₁ = 0.015 m³/h, Q₄ = 3 m³/h) |
| Flow Velocity Range | 0.01–3 m/s |
| Operating Temperature | Cold water type: −20°C to +50°C |
| Hot water type | 0°C to +90°C (customizable higher) |
| Ambient Humidity | ≤95% RH (non-condensing) |
| Outdoor version | ≤90% RH (short-term rain resistance) |
| Power Supply | Standard 3.6 V Li-SOCl₂ battery (2.4 Ah) |
| Communication | Standard RS485 (Modbus-RTU) |
| Enclosure Rating | Body IP65 |
Overview
The YST Ultrasonic Flow Meter Model YST305D150BF223 is a pipe-section-type transit-time ultrasonic flow meter engineered for accurate, non-intrusive volumetric flow measurement in liquid-filled pipelines with nominal diameter DN150 (150 mm). Based on the principle of transit-time difference measurement, the device employs two symmetrically mounted ultrasonic transducers embedded within the meter body. These transducers alternately transmit and receive ultrasonic pulses along diagonal paths across the pipe cross-section. The time difference between upstream and downstream signal propagation—directly proportional to the average axial flow velocity—is precisely measured and converted into instantaneous and cumulative volumetric flow rates using the known internal pipe geometry. Designed for permanent installation in municipal water distribution, industrial process cooling loops, and HVAC systems, this flowmeter delivers stable performance under variable thermal and hydraulic conditions without introducing pressure loss or mechanical wear.
Key Features
- Non-invasive measurement architecture: No moving parts or flow obstruction ensures zero pressure drop, minimizing pumping energy consumption and eliminating risk of clogging or erosion—critical for potable water, cooling water, and low-solids industrial liquids.
- Integrated pipe-section design with flanged ends (DN150, PN1.0/1.6 MPa standard): Enables direct in-line replacement of existing pipeline segments without welding, cutting, or bypass piping—reducing installation time and permitting deployment in confined spaces.
- Dual-path acoustic configuration: Enhances velocity profile averaging across the pipe cross-section, improving measurement robustness against flow disturbances such as partial blockages, elbows, or valves located within recommended straight-pipe requirements (10D upstream / 5D downstream).
- Extended operating range: Supports flow velocities from 0.01 m/s to 3 m/s with turndown ratios of up to 1:200, enabling reliable low-flow detection while maintaining linearity at high flow rates.
- Environmental resilience: IP65-rated meter body and IP68-rated electronics module ensure operational integrity in outdoor, humid, or intermittently wet environments—including short-duration exposure to rainfall or temporary submersion (≤1 m depth, ≤24 h).
- Flexible power and communication options: Field-deployable with long-life lithium thionyl chloride battery (2.4 Ah, typical 5+ year life at 15-min logging interval) or external DC supply; supports Modbus-RTU over RS485 as standard, with optional LoRaWAN or NB-IoT modules for remote telemetry in low-infrastructure settings.
Sample Compatibility & Compliance
The YST305D150BF223 is validated for single-phase, acoustically conductive liquids including potable water, chilled/hot water, glycol solutions, and low-viscosity industrial process fluids (kinematic viscosity < 20 cSt). It is not suitable for gases, steam, slurries with >5% suspended solids, or highly aerated liquids. While not certified to ISO 4064 or OIML R49 for legal metrology, its Class 2 accuracy (per ISO 6946:2017 Annex A for transit-time meters) aligns with common utility and industrial monitoring requirements. The device complies with electromagnetic compatibility standards IEC 61326-1 (industrial environment) and meets RoHS Directive 2011/65/EU. Battery-powered operation satisfies intrinsic safety considerations for non-hazardous area installations per IEC 60079-0.
Software & Data Management
The meter operates autonomously with onboard data logging (up to 16,384 records) and supports real-time data streaming via RS485. Configuration, calibration, and diagnostics are performed using YST’s proprietary PC-based configuration software (Windows-compatible), which provides access to raw transit-time values, signal quality indicators (SNR, amplitude, path gain), and diagnostic flags (e.g., air bubble detection, sensor fault). All parameter changes are timestamped and stored in non-volatile memory. For integration into SCADA or cloud-based platforms, Modbus-RTU register mapping is fully documented, supporting seamless interoperability with industry-standard HMI/SCADA systems. Remote firmware updates are supported via LoRa/NB-IoT gateways where enabled, facilitating lifecycle maintenance without site visits.
Applications
- Municipal water utilities: Real-time flow monitoring at district metering areas (DMAs), pump station discharge lines, and interconnection points to support leakage analysis, pressure management, and hydraulic model validation.
- Industrial cooling circuits: Continuous flow verification in open- or closed-loop systems serving heat exchangers, chillers, and condensers—enabling predictive maintenance and energy efficiency optimization.
- Commercial building management: Submetering of chilled/hot water distribution networks in hospitals, data centers, and large office complexes to support LEED certification and utility cost allocation.
- Food & beverage processing: Non-contact flow verification in sanitary hot-water rinse lines and CIP return loops where hygiene and minimal maintenance are critical.
- Renewable energy plants: Monitoring secondary coolant flow in geothermal heat exchanger manifolds and solar thermal collector arrays.
FAQ
What is the minimum required straight-pipe length for optimal accuracy?
For Class 2 performance, a minimum of 10 pipe diameters (1500 mm) upstream and 5 pipe diameters (750 mm) downstream of the meter is recommended. If space is constrained, YST provides field-verified correction factors based on empirical testing with common upstream disturbances.
Can the meter be used in stainless steel or lined pipes?
Yes—provided the pipe wall material is ultrasonically transmissive (e.g., carbon steel, stainless steel, PVC, ductile iron) and the lining is non-detached and acoustically coupled. Pipe wall thickness and lining composition must be declared during configuration to ensure proper acoustic path modeling.
Is the device suitable for custody transfer applications?
No. This model is intended for industrial process monitoring, utility billing support, and energy management—not for fiscal metering or regulatory custody transfer, which require MID or OIML-certified instrumentation with full traceable calibration.
How is temperature compensation handled for hot water applications?
An integrated Pt1000 RTD sensor (optional or built-in depending on variant) measures fluid temperature at the measurement section. Velocity calculations apply real-time sound speed correction using the ISO 7726 water property database, ensuring accuracy across the full 0–90°C operating range.
Does the device support data export in CSV or JSON format?
Yes—via YST’s configuration software, logged data can be exported in CSV format with UTC timestamps, flow rate, totalized volume, and diagnostic metadata. API endpoints for LoRa/NB-IoT variants enable JSON payload delivery to MQTT or HTTP-based cloud platforms.
