Brand: pFlow

pFlow QMF Inline Micro Flow Sensor

Name: pFlow QMF Micro Flow Sensor | Seven Star LLC
Brand: pFlow

Description

Overview

The pFlow QMF Inline Micro Flow Sensor is a high-precision instrument engineered for accurate and repeatable measurement of low-viscosity fluids in small-diameter piping. Designed for demanding industrial environments, the QMF series provides a robust and reliable solution for monitoring and controlling micro-flow applications where precision is paramount. Its compact inline design allows for easy integration into existing systems, minimizing installation complexity and footprint. This sensor is the ideal choice for system integrators, engineers, and facility managers in sectors such as high-performance computing, advanced agriculture, and chemical processing who require dependable flow data to optimize their processes, ensure product quality, and maintain operational efficiency. The QMF sensor’s ability to deliver precise measurements at flow rates as low as 0.1 L/min makes it an essential component for resource management and process automation in mission-critical systems.

Measurement Principle

The pFlow QMF Inline Micro Flow Sensor operates on a proven turbine-based measurement principle, which is optimized for high-accuracy readings in low-flow conditions. As fluid passes through the sensor’s DN10 body, it impinges upon a miniature, low-inertia turbine rotor, causing it to rotate at a speed directly proportional to the fluid velocity. This rotor is meticulously balanced and mounted on low-friction bearings to ensure an immediate and linear response to changes in flow rate, even at the lowest end of its operational range. An integrated Hall-effect sensor detects the rotation of the turbine blades, generating a high-resolution train of electrical pulses. Each pulse corresponds to a discrete volume of fluid. The onboard microprocessor then processes this pulse signal, converting it into a calibrated flow rate and totalized volume. This method provides exceptional linearity and repeatability across the sensor’s entire measurement range, from 0.1 to 35 L/min, ensuring that the data output is consistently accurate and reliable for process control and monitoring.

Engineering Design

The pFlow QMF sensor is engineered for durability and long-term performance in industrial settings. The sensor body is constructed from high-grade, chemically resistant materials, ensuring compatibility with a wide range of fluids, including deionized water, glycols, and mild chemical solutions. Its robust inline construction, with a nominal diameter of DN10, is designed to withstand the mechanical stresses of industrial piping systems. The internal wetted components, including the turbine and bearings, are selected for their low friction and high wear resistance, which contributes to the sensor’s extended service life and stable performance over time. The sensor’s electronics are housed in a sealed, IP-rated enclosure, protecting them from dust, moisture, and other environmental contaminants. This thoughtful design minimizes maintenance requirements and ensures reliable operation. The integration of both RS485 Modbus and 4-20mA/OCT outputs provides versatile connectivity options, allowing for seamless integration with a variety of industrial control systems, PLCs, and data acquisition hardware. This dual-output capability simplifies system architecture and reduces the need for additional signal converters, making it a cost-effective and flexible solution for modern industrial automation.

Key Features

High-Precision Measurement: Delivers an accuracy of ±2% of full scale (FS) for reliable and repeatable flow monitoring in critical processes.
Wide Measurement Range: Accurately measures flow rates from 0.1 to 35 L/min, making it suitable for a broad spectrum of micro-flow applications.
Compact Inline Design: The DN10 body allows for straightforward installation in space-constrained environments without complex piping modifications.
Robust Construction: Built with chemically resistant materials to ensure compatibility with various low-viscosity fluids and long-term operational durability.
Dual Output Signal: Provides both RS485 Modbus and 4-20mA/OCT outputs for flexible integration with standard industrial control and data acquisition systems.
Low-Inertia Turbine: A precision-engineered turbine ensures a rapid and linear response to changes in flow, enhancing measurement accuracy at low velocities.
Integrated Electronics: Onboard microprocessor handles signal processing and conversion, providing a clean, calibrated output and simplifying system design.

Industrial Applications

The pFlow QMF Inline Micro Flow Sensor is engineered for a variety of industrial applications where precise flow measurement is critical for operational success. Its robust design and high accuracy make it an indispensable tool in several key sectors:

Data Center Liquid Cooling: In high-density data centers, the QMF sensor is used to monitor and control the flow of liquid coolants to server racks and other critical IT infrastructure. Precise flow management ensures optimal thermal performance, prevents overheating, and reduces energy consumption by enabling dynamic cooling adjustments based on real-time load.
Agricultural Drones and Precision Farming: The sensor is integrated into agricultural drones and automated irrigation systems to precisely measure the application of fertilizers, pesticides, and water. This enables farmers to implement precision agriculture techniques, optimizing crop yields, reducing waste, and minimizing environmental impact.
Chemical Dosing and Blending: In chemical processing and manufacturing, the QMF sensor provides accurate measurement for dosing and blending systems. Its chemical resistance and high precision ensure that exact quantities of additives, catalysts, or reagents are dispensed, leading to consistent product quality and optimized use of raw materials.
Laboratory and Research: The sensor is utilized in scientific research and laboratory settings for experiments that require precise fluid handling and measurement. Its compact size and accuracy are ideal for pilot plants, test benches, and analytical instrumentation.
Water Treatment and Purification: In water purification systems, such as reverse osmosis and deionization, the QMF sensor monitors the flow of water through various stages of treatment. This ensures the system operates efficiently and that the final product meets required purity standards.

Technical Specifications

Parameter	Value
Measurement Range	0.1 – 35 L/min
Accuracy	±2% FS
Output Signals	RS485 Modbus, 4-20mA/OCT
Pipe Size	DN10
Fluid Temperature	-20°C to +100°C
Maximum Pressure	1.6 MPa
Wetted Materials	PPS, Stainless Steel, Ceramic

Request a Quote

As the officially authorized pFlow representative in Oman, Seven Star LLC supplies micro flow sensors on request, with manufacturer documentation and technical support throughout Oman and the GCC. Contact Seven Star LLC to request a quote (RFQ) or the official pFlow QMF datasheet. Our engineering team is ready to assist with your flow measurement requirements.

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About brand

Clamp-on ultrasonic flow measurement is what pFlow does. The sensors strap to the outside of the pipe and measure liquid flow by transit time, so the line is not cut and nothing touches the fluid. The brand comes from Gentos, an instrument maker focused on ultrasonic flowmeters, flow sensors and heat and cooling energy meters.

Seven Star LLC is the pFlow agency for Oman and the GCC, listing pFlow ultrasonic flowmeters in fixed, portable and LoRaWAN versions, BTU meters and LoRaWAN flow control valves.

pFlow flowmeter families

Most of the listed models are compact clamp-on sensors grouped by pipe size and duty. The GF family (GFCL, GFR, GF-S-CL, GF-SH-CL for hot water and GF-GH-CL for immersion cooling) and the MF micro flowmeters (MFR, MFCL) serve cooling and process loops on small and medium pipes. The MP series are plug-and-play flow sensors, including the MP801 and a LoRaWAN version. The D116-BTU is a wall-mounted ultrasonic BTU meter, the P116 a portable flowmeter for surveys, and the F8 a fixed meter used in aquaculture. Gentos also builds the F3 series clip-on flowmeters, including a panel-mount version. The VC200-R is a LoRaWAN ball valve that works as a flow switch.

Where pFlow meters are used

The manufacturer documents use in liquid cooling for data centers and semiconductor plants, chilled and hot water metering in central air conditioning, water supply networks and irrigation, aquaculture, and utility lines in petrochemical and power plants.

Ordering a pFlow ultrasonic flowmeter: what we need

Clamp-on meters are selected from pipe data. Send the pipe outside diameter, wall thickness and material, any liner, the liquid and its temperature, the expected flow span and the straight pipe length available. Add the output you need (4-20 mA, pulse, Modbus, LoRaWAN) and the supply voltage. For BTU meters include the supply and return temperature span.

FAQ

Questions about the pFlow QMF Inline Micro Flow Sensor

Answers from our engineering team on installation, compatibility and integration.

01What types of fluids are compatible with the pFlow QMF sensor?

The pFlow QMF Inline Micro Flow Sensor is designed for use with a variety of low-viscosity fluids. Its wetted parts are made from chemically resistant materials, making it suitable for deionized water, glycols, and a range of mild chemical solutions. We recommend consulting the datasheet or contacting our engineering team to confirm compatibility with specific fluids. How does the dual-output feature benefit my application? The dual-output capability, offering both RS485 Modbus and 4-20mA/OCT signals, provides significant flexibility for system integration. You can connect the sensor to modern digital control systems using Modbus for advanced diagnostics and data logging, while simultaneously using the analog 4-20mA signal for simple integration with legacy PLCs or local displays. This eliminates the need for external signal converters, reducing system complexity and cost. Can the QMF sensor be installed in any orientation? For optimal performance and to ensure the longevity of the turbine bearings, it is recommended to install the pFlow QMF sensor in a horizontal position with the flow direction arrow aligned with the fluid path. Installation in vertical lines is possible, but it is best to ensure the flow is directed upwards to keep the pipe full and prevent air pockets from affecting measurement accuracy. What is the maintenance schedule for this micro flow sensor? The pFlow QMF sensor is engineered for minimal maintenance. However, the frequency of inspection and cleaning will depend on the cleanliness of the fluid being measured. It is good practice to install a filter upstream of the sensor to prevent particulate matter from damaging the turbine. Periodic checks for any signs of wear or buildup are recommended, especially in applications with aggressive or contaminated fluids. How does the sensor perform at the very low end of its measurement range? The sensor is specifically designed for high performance in micro-flow applications. The low-inertia turbine and high-sensitivity Hall-effect sensor ensure a linear and repeatable response even at flow rates as low as 0.1 L/min. This makes the pFlow QMF an excellent choice for applications requiring precise control and monitoring of very small fluid volumes.

02How do I request a quotation for pFlow QMF Inline Micro Flow Sensor?

Send the model number, required quantity and delivery location through the quote request form or by email to Seven Star LLC. The sales team replies with availability, lead time and commercial terms for your Oman or GCC project.

03What information should I provide when ordering pFlow QMF Inline Micro Flow Sensor?

Provide the full model or part number, quantity, the application and any required options or certifications. This lets the team confirm the exact configuration and avoid ordering a wrong variant.

04Where can I find the datasheet for pFlow QMF Inline Micro Flow Sensor?

The datasheet and related documents are available for download in the Datasheets & Documents tab on this product page. Contact Seven Star LLC if you need an additional document for your project.

05Can Seven Star LLC deliver pFlow QMF Inline Micro Flow Sensor to locations across Oman and the GCC?

Seven Star LLC serves industrial customers in Oman and across the GCC. Delivery timing depends on the item and destination and is confirmed in the written quotation.