pFlow GFCL Ultrasonic Flowmeter for HVAC Systems

Overview

The pFlow GFCL Ultrasonic Flowmeter is a non-invasive device that uses the transit-time method to measure flow rates accurately across the full range of HVAC system water circuits, from chilled water and heating water loops to cooling towers and air handling units. Its integrated external clamping structure enables easy installation without breaking pipelines, giving building services engineers a fast, accurate way to bring flow visibility to existing HVAC infrastructure.

As the official authorized partner and exclusive regional representative for pFlow Gentos, Seven Star LLC proudly supplies the GFCL to HVAC contractors, building automation integrators, and facilities management teams across the Sultanate of Oman, Muscat, and the wider GCC. Its versatility across chilled water, heating water, and cooling tower applications makes it a practical all-around choice for HVAC energy management projects.

Measurement Principle

The pFlow GFCL measures flow using the ultrasonic transit-time method, achieving 2.0% accuracy with 0.4% repeatability across a flow velocity range of 0.03m/s to 5.0m/s, corresponding to a flow range of 0.02 to 35 m³/h. Because the transducer clamps onto the pipe exterior, the GFCL avoids introducing any pressure drop or obstruction into HVAC circuits, keeping cooling and heating systems fully operational during installation.

This non-invasive principle supports a wide range of HVAC monitoring functions: chilled water flow monitoring ensures the cooling system operates efficiently; heating water flow measurement improves energy efficiency and reliability in hot water systems; and cooling tower water management tracks water entering and exiting the tower to optimize heat dissipation.

Engineering Design of the pFlow GFCL

The pFlow GFCL is built as an all-in-one transmitter paired with a clamp-on transducer, connected via a 5mm six-core shielded cable with a standard 4-meter length. The enclosure uses PC (polycarbonate) material with an aluminum alloy pipe clamp, and the unit carries an IP54 rating for reliable operation in mechanical rooms and plant spaces.

A 1.54-inch TFT-LCD colorful display with 240×240 resolution and three touch keys provide clear readings and straightforward field configuration. Communication is handled via RS485, supporting both FUJI and MODBUS protocols alongside a standard 4–20mA output, giving HVAC control system integrators flexibility when connecting the GFCL into building management platforms for energy management and cost analysis over time.

Key Features

The pFlow GFCL combines precise HVAC flow measurement with flexible connectivity. Core capabilities include:

• Non-invasive clamp-on installation with no pipe cutting for DN15 to DN50 pipes.
• 2.0% measurement accuracy with 0.4% repeatability for reliable HVAC monitoring.
• RS485 communication supporting both FUJI and MODBUS protocols, plus 4–20mA output.
• 1.54-inch TFT-LCD colorful display with 240×240 resolution for clear field readings.
• Compatible with stainless steel, copper, PVC, and PPR pipe materials.
• Suitable for chilled water, heating water, cooling tower, and AHU flow monitoring.
• Pump performance monitoring capability when installed on discharge lines.
• Supports energy management and cost analysis through integration with BMS platforms.

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• Standard 4-meter cable length between transmitter and transducer for flexible mounting.

Industrial Applications

The pFlow GFCL is engineered for the full range of HVAC water flow monitoring needs across Oman’s commercial and institutional building stock, including chilled water systems, heating water loops, cooling towers, air handling units, and heat exchangers. Its ability to optimize heat transfer processes and monitor pump performance makes it a valuable tool for facilities teams seeking to improve HVAC energy efficiency.

As the officially authorized partner for pFlow Gentos, Seven Star LLC distributes the GFCL to building automation projects, process industries including chemical, pharmaceutical, and food and beverage facilities, and energy management programs throughout the Sohar and Salalah economic zones and the broader GCC region.

Technical Specifications

Full technical parameters for the pFlow GFCL ultrasonic flowmeter:

Why Choose Seven Star LLC for HVAC Flow Metering

HVAC retrofits across Oman’s commercial building stock often involve multiple flow points spread across chilled water, heating water, and cooling tower circuits, each potentially needing a different protocol to integrate with the building’s existing BMS. Seven Star LLC’s engineers confirm whether a project’s control system expects FUJI or standard MODBUS communication before the GFCL ships, avoiding a protocol mismatch that would otherwise surface only during commissioning.

As the authorized regional partner for pFlow Gentos, we also help facilities management teams plan multi-point GFCL rollouts across chilled water, heating water, and cooling tower circuits in a single building, and can coordinate bulk orders for developments standardizing HVAC energy monitoring across Muscat, Sohar, and the wider GCC, and can advise on which flow points within a building deliver the most useful energy-management data for a given retrofit budget.

Request a Quote for pFlow GFCL Ultrasonic Flowmeter for HVAC Systems

To submit a formal Request for Quote (RFQ), check current availability and lead time, or request complete technical datasheets for the pFlow GFCL Ultrasonic Flowmeter for HVAC Systems, please contact the official instrumentation division at Seven Star LLC today. As the authorized partner for pFlow Gentos in Oman and the GCC, our engineers are ready to assist with commercial sourcing and HVAC flow metering integration.

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