The M-50/55 Fixed Flow Switch monitors increasing and decreasing flow. It utilizes a single moving part which responds to fluid (liquid or gas) flowing within a system. The switch is suitable for a wide range of applications in industrial, biomedical, and OEM products. The flow switch operates only when fluid flow is positively established.

The M-50 Flow Switch features two port size options (1/8" or 1/4") and has a flow range up to 170 CCM (0.04 GPM) for water and 5,000 SCCM for air. The 1/8" port sized M-55 Flow Switch features a flow range up to 750 CCM (0.19 GPM) for water and 25 SLPM for air. M-50/55 Flow Switches have configurations available for single-pole, single-throw (SPST) or single-pole, dual-throw (SPDT) allowing for flexibility with different outputs for both the high and low set point.

The operating principle is based on a free floating magnetic piston which responds only to the motion of fluids within the line, not to static or system pressures. In the presence of fluid flow, controlled movement of the piston actuates an external hermetically sealed reed switch thus producing the required signal. Piston travel is short which insures low hysteresis. Universal mounted units are built with a spring which resets the piston. Applications include pure water control for sample stations, laser equipment, and pollution sampling equipment.