PFM725S-C8L-F: 2-Color Display Digital Flow Switch, Precision Monitoring Expert for Large Flow Pipes

Product Positioning
The PFM725S-C8L-F is a 2-color display digital flow switch from SMC’s PFM7 series, employing thermal MEMS flow detection technology. It is specifically designed for high-precision monitoring of medium to large flows of clean gases such as dry air, nitrogen, and argon. Its compact integrated structure, dual-screen display, and composite output functions make it an ideal choice for achieving flow visualization and online monitoring in semiconductor manufacturing, medical devices, energy-saving management, and precision pneumatic systems.

Core Highlights: MEMS Sensing, Medium to Large Flow, Precision Visualization

• Thermal MEMS Sensing Technology, Precise Flow Detection
  • Employs thermal MEMS (Micro-Electro-Mechanical Systems) flow detection, measuring flow based on heat transfer changes when fluid passes over a heating element. It is unaffected by fluctuations in fluid pressure or temperature, making it particularly suitable for precise measurement from micro to medium flows.
  • Rated flow range is 10 to 100 L/min (for PFM725 model). The settable instantaneous flow range is 0.5 to 100 L/min, with a minimum setting unit of 0.1 L/min, meeting the flow monitoring needs of medium to large pneumatic systems.
• Dual-Color LCD Dual Screen Display, Clear Status Indication
  • Equipped with a 2-color LCD display (red/green). Both the main and sub-screens are 4-digit 7-segment displays, allowing simultaneous display of instantaneous flow and cumulative flow.
  • The display color can be freely switched according to output status or set conditions, making the operating status intuitively visible and convenient for on-site monitoring and debugging.
• Composite Output Function, Strong Compatibility
  • The output specification is Type F: OUT1 is PNP open collector (switch output), OUT2 is analog 1-5V voltage output.
  • Provides both switching signals (for alarms, control) and analog signals (for continuous monitoring, data acquisition), offering flexible adaptation to various control systems like PLCs and data recorders.
• Large Flow Piping, Strong Flow Capacity
  • Port size is C8L: Φ8mm One-touch fitting (C8 represents Φ8mm, L may indicate the type or specific material).
  • Maximum flow rate reaches 100 L/min, suitable for medium-bore pneumatic lines.
• High Withstand Pressure, Safe and Reliable
  • Operating pressure range is -0.1 to 0.75 MPa, with a proof pressure of 1.0 MPa, providing ample overload safety margin.
• Fast Response, Good Repeatability
  • Sensor response time is only 0.05 seconds, and analog output response time is also controlled within 0.05±40% seconds, allowing timely capture of flow transients.
  • Repeatability is as high as ±1% F.S., ensuring consistency and reliability of measurement results.
• Compact and Lightweight, Space Saving
  • Weight is only approximately 0.085 kg (85g), with a small volume for installation in tight spaces.

Model Number Interpretation

Specification Overview

Structure and Features
According to SMC technical data, the main features of the PFM7 series include:

• Integrated Flow Control Valve: The “S” in the model number represents a built-in manual flow control valve, allowing manual adjustment while monitoring flow for closed-loop control.
• Independent Dual Screen Display: The main screen displays instantaneous flow, the sub-screen displays cumulative flow, or can be switched to display peak/valley values, providing richer information.
• Color Switching Function: The output ON/OFF status is linked with the display color for intuitive operational status.
• Energy Saving Management Function: Monitor equipment air consumption via cumulative flow, identify abnormal leaks, and contribute to energy saving and emission reduction.
• Suitable for Cleanrooms: The body uses a grease-free design, suitable for cleanroom applications.

Applicable Scenarios

• Semiconductor Manufacturing: Flow monitoring and control for process gases, purge gases.
• Medical Equipment: Flow control and monitoring for ventilators, anesthesia machines, gas mixers.
• Energy Saving Management: Compressed air leak detection, statistical analysis of equipment air consumption for on-demand air supply.
• Large Pneumatic Systems: Supply flow monitoring for medium-sized cylinders, vacuum ejectors.
• Analytical Instruments: Carrier gas flow monitoring for gas chromatographs, gas analyzers.
• Inert Gases: Flow monitoring and control for shielding gases like nitrogen (N₂) and argon (Ar).

Summary: Intelligent Flow Monitoring Node for Medium to Large Flow Pipelines
The PFM725S-C8L-F digital flow switch achieves an excellent balance between measurement accuracy for medium to large flows and manual control flexibility through its combination of thermal MEMS sensing technology and an integrated flow control valve. Its wide 10-100 L/min range covers the flow requirements of most industrial pneumatic systems. The dual-color, dual-screen display makes operational status instantly clear, and the composite PNP switch + 1-5V analog output grants it strong system compatibility. Choosing the PFM725S-C8L-F means equipping your clean gas pipeline with an intelligent “flow management node” integrating measurement, display, adjustment, and control, putting every dynamic of the gas flow at your fingertips – an ideal choice for enhancing equipment performance, achieving lean production, and managing energy efficiency.