GreenPrima Prolev700 / Prolev700-H Clamp-on Ultrasonic Flow Meter & Heat Meter

Overview

The GreenPrima Prolev700 and Prolev700-H are clamp-on, transit-time ultrasonic flow meters engineered for non-intrusive, high-reliability liquid flow measurement in industrial process control environments. Based on the principle of time-of-flight differential measurement—where ultrasonic pulses travel upstream and downstream through the fluid—the instruments calculate volumetric flow rate by precisely measuring the nanosecond-scale time difference between co- and counter-propagating signals. This method eliminates dependence on fluid conductivity, pressure, or chemical composition, making the Prolev700 series suitable for clean, low-conductivity, and mildly aerated liquids including potable water, ultrapure water (UPW), chilled/hot water in HVAC systems, and closed-loop cooling water in power generation and petrochemical facilities. As a dual-function device, the Prolev700-H variant extends capability to thermal energy metering (heat metering) when paired with certified PT100 temperature sensors and configured per EN 1434 and ISO 4064-6 standards.

Key Features

• True clamp-on installation: No pipe cutting, welding, or process shutdown required—ideal for retrofit applications and temporary monitoring.
• Low-power piezoelectric transducers with optimized acoustic coupling ensure stable signal acquisition even under low-flow or high-turbidity conditions.
• Robust interference rejection: Adaptive digital signal processing (DSP) filters out electrical noise, vibration-induced artifacts, and multipath reflections.
• High air bubble tolerance: Advanced signal validation algorithms maintain measurement continuity during transient aeration common in pump suction lines or open-channel feeds.
• No calibration drift: Factory-trimmed time-base oscillator and self-diagnostic transducer health monitoring eliminate periodic recalibration needs over extended service life.
• Configurable dual relay outputs for alarm, batch control, or pump interlock functions—fully programmable via local keypad or Modbus register access.
• Integrated diagnostics: Real-time signal quality index (SQI), transit-time stability flag, and sensor coupling status displayed directly on the LCD.

Sample Compatibility & Compliance

The Prolev700 series is validated for homogeneous single-phase liquids with sound speed >1,000 m/s and acoustic attenuation <10 dB/m at 1 MHz. It supports carbon steel, stainless steel (304/316), PVC, CPVC, and GRP pipes with wall thicknesses up to 40 mm. Applications include municipal water distribution, semiconductor UPW loops (ASTM D5127-compliant), HVAC energy management (ASHRAE Guideline 14), and industrial cooling circuits subject to ISO 5167-5 verification protocols. The Prolev700-H model complies with EN 1434-3 (accuracy class 2) for heat metering when installed per EN 1434-2 mounting requirements and paired with Class B or better PT100 sensors. All units meet EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU; CE marking applies to both host and sensor assemblies.

Software & Data Management

Local configuration is performed via the 16-key membrane keypad and backlit monochrome LCD—menu structure follows IEC 61511 logic for intuitive navigation without training dependency. For system integration, the RS-485 interface supports Modbus RTU (slave mode, address 1–247) with standard register mapping covering flow rate, totalized volume, temperature (for Prolev700-H), signal quality, and diagnostic flags. Data logging is not embedded but compatible with third-party SCADA platforms (e.g., Ignition, Siemens Desigo CC, Schneider EcoStruxure) supporting Modbus TCP gateways. Audit trails are maintained externally per customer’s GLP/GMP data integrity policy; no internal storage or user-accessible firmware updates are provided to ensure deterministic behavior in regulated environments.

Applications

• Municipal water utilities: District metering areas (DMAs), pump station inflow/outflow verification, leakage detection support.
• Semiconductor & pharmaceutical manufacturing: Monitoring UPW loop return flows where conductivity-based meters fail and hygienic design precludes insertion devices.
• Commercial HVAC: Chilled water and condenser water balancing across multi-chiller plants; demand-side energy optimization per ASHRAE 90.1.
• Thermal power plants: Closed-circuit cooling water circulation monitoring, feedwater pre-heater bypass verification.
• Chemical process lines: Non-contact flow verification of solvents, glycols, and low-conductivity process streams where electrode fouling compromises electromagnetic alternatives.

FAQ

Is the Prolev700 suitable for custody transfer applications?
No. It is designed for process monitoring, energy auditing, and control feedback—not fiscal metering. Its ±1.0% accuracy meets ISO 4064-2 Class 2 but does not satisfy OIML R49 or API MPMS Ch. 5.8 requirements for revenue-grade measurement.

Can the sensor be installed on lined or insulated pipes?
Yes—provided the liner material is acoustically transparent (e.g., rubber, epoxy, PTFE ≤3 mm thick) and insulation is removed locally at the transducer mounting zone. Couplant gel application must conform to ASTM E1158 guidelines.

What is the minimum straight-pipe requirement for accurate measurement?
10D upstream and 5D downstream from disturbances (valves, elbows); field correction factors are available in the user manual for reduced spacing scenarios.

Does the Prolev700-H support hot/cold energy calculation per EN 1434?
Yes—when configured with two calibrated PT100 sensors (supply/return), correct enthalpy tables, and verified flow/temperature synchronization (≤100 ms latency).

Is firmware upgrade supported in the field?
No. Firmware is factory-locked to ensure repeatability and compliance traceability. Functional updates require replacement of the main board under GreenPrima’s technical support agreement.