The Micro Sensor MFM500A is an intelligent thermal flow switch that redefines reliability in industrial flow monitoring. Unlike traditional mechanical switches prone to wear and clogging, the MFM500A operates on the principle of thermal diffusion and houses its electronics in a rugged, fully enclosed stainless steel body. At its core lies an ARM industrial-grade MCU, which processes sensor data through dedicated algorithms and temperature compensation. This ensures consistent and accurate switching behavior even with fluctuating water temperatures, making it a "set and forget" solution for critical cooling and lubrication circuits. The IP67-rated enclosure guarantees robust performance in harsh factory environments, effectively eliminating unplanned downtime caused by switch failure.

The MFM500A is engineered for both precision and ease of use. It accurately monitors flow velocities from 1cm/s to 150cm/s in water (3cm/s to 300cm/s in oil) with a switch accuracy of ±10cm/s and adjustable hysteresis. Its built-in self-luminous 128x32 OLED display provides a crystal-clear, real-time view of flow status, switchable between an intuitive progress bar and precise digital readouts. The display's reversible orientation adds significant flexibility during panel installation. Setting the alarm threshold is streamlined through a simple push-button interface, eliminating the need for complex programming tools or external PCs. The device also features a fast response time, typically 2 seconds for switching on/off, ensuring timely alerts and protective actions.

Versatility is a cornerstone of the MFM500A's design. It offers multiple output configurations to seamlessly integrate with any control system, including a robust relay output (3A/250VAC) for direct load switching, NPN/PNP transistor outputs for high-speed signals, and a 4-20mA analog output for continuous flow trending and detailed process analysis. The device is powered by a standard 24V DC supply (with an optional 220VAC model) and consumes minimal power (≤60mA). It incorporates comprehensive electrical protections against reverse polarity, short circuits, and over-voltage, ensuring long-term operational safety. The modular joint and adaptor mounting system, combined with a standard M12x1 electrical connector, makes installation straightforward across a wide range of pipe diameters and orientations.

Built to withstand demanding industrial applications, the MFM500A is rated for an impressive pressure of 10MPa and can operate reliably in ambient temperatures from -20°C to 70°C. The device is particularly effective at monitoring water flow, with an operating temperature range of -20°C to 80°C for the medium and active temperature compensation between 5°C and 50°C. Weighing approximately 265g, its compact and robust construction makes it ideal for a multitude of applications, including cooling system flow verification, pump dry-run protection, lubrication system monitoring, and flow protection in heavy industries such as power generation, metallurgy, steel, paper, and boiler operations.

Technical Specifications