SMC PF2A721-N03-27 Digital Flow Switch for Air

The SMC PF2A721-N03-27 is a compact digital flow switch designed for monitoring and controlling air flow in pneumatic systems. Manufactured by SMC Corporation, this device offers precise flow measurement and switching capabilities, making it ideal for applications in industrial automation, manufacturing, and process control where reliable air flow detection is critical. Key features include a clear digital display for real-time flow readings, adjustable set points for high/low flow alarms, and dual NPN outputs for integration with PLCs or control systems. It supports a flow range of 20 to 200 L/min, with 3/8" NPT connections for easy installation in air lines. Advantages over similar products include its robust construction, high accuracy (±3% F.S.), and IP65-rated enclosure for dust and water resistance, ensuring durability in harsh environments. Benefits include energy savings through optimized air usage, reduced downtime via predictive maintenance alerts, and user-friendly programming with up/down/set buttons. Drawbacks may include the need for periodic calibration and limitation to air or non-corrosive gases only. Compared to basic mechanical switches, it provides superior precision and digital integration, though it requires a 12-24 VDC power supply. Based on attached images, the unit appears used but in good condition, with no visible damage, a functional display, and intact labeling including model details and CE marking. No parent/child assets are evident. For resources, refer to SMC's official datasheet (available at https://www.smcworld.com/products/en/smc_products/en/pdf/PF2A.pdf) and operation manual (https://www.smcworld.com/products/en/smc_products/en/pdf/PF2A_manual.pdf).