The Malema M-50/55 Series is a family of fixed set point, in-line flow switches designed for precise low-flow detection in both liquid and gas applications. At its core is a free-floating magnetic piston that responds solely to fluid motion, ensuring reliable switching independent of static or system pressures. When flow reaches the calibrated set point, the piston's movement actuates an external hermetically sealed reed switch, generating a signal for alarms, relays, or other controls.

Key Features

• Low Flow Sensitivity: Capable of detecting flows as low as 1 mL/min for water (M-50) and 50 sccm for air, making it ideal for critical low-flow monitoring.
• Hazardous Location Ready: UL recognized for hazardous locations and Cenelec certified for intrinsic safety and encapsulation, suitable for demanding environments.
• Wide Material Compatibility: Available in multiple wetted materials including 316 stainless steel, PTFE, brass, aluminum, and acrylic, ensuring compatibility with corrosive and non-corrosive fluids.
• Flexible Configurations: Available in SPST or SPDT switch configurations. Universal mount units can be installed horizontally or vertically.
• Hermetically Sealed Switch: The reed switch is completely isolated from the flow path, preventing leakage and ensuring long-term reliability.

Technical Specifications

• Flow Ranges:
  • M-50: Water 1-170 mL/min; Air 50-5,000 sccm
  • M-55: Water 170-750 mL/min; Air 5,000-25,000 sccm (25 SLPM)
• Pressure Drop: 0.035 to 2 psi at maximum flow rates (air and liquid)
• Switch Ratings (Reed): 10W SPST / 3W SPDT, 200 VDC max switching voltage
• Operating Temperature (Reed): -40°C to 125°C
• Mounting Orientation: Standard units must be mounted vertically (as calibrated); universal units can be mounted horizontally or vertically.

Applications

The M-50/55 series is widely used in industrial automation, biomedical equipment, OEM products, gas chromatographs, hazardous fluid systems, pure water control for sample stations, laser cooling systems, leak detection, and pollution sampling equipment.