Laminar Flow Differential Pressure Mass Flow Controller: Enabling Precise Flow Measurement and Control
The core logic of the laminar‑flow differential‑pressure mass flow controller is as follows: gas enters through the inlet and passes through a specially designed laminar‑flow element, which uses precision flow channels to transform disordered turbulent flow into a stable laminar flow, thereby creating ideal conditions for measurement. A built‑in high‑sensitivity differential pressure sensor continuously measures the pressure drop across the element and, via a calibrated algorithm, converts this reading into a flow rate. Meanwhile, a temperature sensor dynamically compensates for temperature‑induced variations, eliminating measurement bias. Based on this principle, the laminar‑flow differential‑pressure mass flow controller delivers excellent accuracy and repeatability across its entire range, is not limited by the gas’s specific heat capacity, exhibits broad media compatibility, and requires no heating unit. Coupled with a flow valve that adjusts its opening in response to the control signal, it forms a closed loop—“measurement–calculation–control”—enabling precise, fast‑response operation.
Beijing AccuFlow Technology Co., Ltd. (hereinafter referred to as “ACCU”) Having cultivated this technology for many years, the company has launched its differential-pressure series ( ACU10FC/ACU20FC/ACU30FC Mass Flow Controller/Flow Meter ) Building on its traditional strengths, it has further enhanced intelligence and ease of use. Among them, ACU30FC Featuring a compact mechanical design, it occupies minimal space, making it easy to integrate into narrow pipelines or retrofit existing systems. Its measurement range spans from ultra‑low to high flow rates, with consistent accuracy across the entire span. At its core, it employs a differential pressure principle that exhibits no thermal drift and zero response lag, fundamentally eliminating “specific heat capacity”‑related errors. When switching between gases, no recalibration is required, and it comes preloaded with multiple gas databases, enabling precise measurements with a single button press. Additionally, it supports real‑time display and output of multiple parameters—including instantaneous flow, cumulative flow, pressure, and temperature—while featuring a large, high‑resolution screen that clearly presents flow rate, differential pressure, and other key data in an intuitive, user‑friendly interface.
At present, the ACU differential-pressure series products are widely used in the following fields:
1. Industrial production: carrier gas, protective gas, and online metering of low-pressure process fluids in the chemical industry.
2. Environmental Protection and Atmospheric Monitoring: Monitoring and controlling environmental parameters such as exhaust gas emissions and air quality.
3. Energy Management: In pipeline systems for natural gas, liquefied petroleum gas, and other energy sectors, measure and control gas flow rates.
4. Scientific Experiments: Precise fluid experiments and analyses conducted in a laboratory setting.
5. Medical Equipment: In medical devices, it is used to control and monitor fluid delivery, gas therapy, and other processes.
6. Laboratory applications: gas mixing, microfluidic experiments, and ventilation airflow monitoring.
It is also widely used in numerous industries, including semiconductors and heat treatment.
Amid the twin waves of intelligent manufacturing and domestic substitution, ACCU leverages its robust measurement and control technologies, consistent product quality, and flexible customization capabilities to deliver cost-effective, highly reliable flow‑measurement and control solutions for China’s high‑end manufacturing sector, ensuring that every process runs smoothly and with unwavering precision.
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