Non-Adjustable Flow Switches M-50/55 Series Fixed setting flow switch with in-line flow Features • Very accurate custom flow settings • For corrosive and non-corrosive liquids or gases • All-Teflon® switch available • Senses increasing or decreasing flow • Hermetically sealed • Universal mounting available The M-50/55 low flow, flow switches monitor increasing and decreasing flow. They utilize a single moving part which responds to fluid (liquid or gas) flowing within a system. These switches are suitable for a wide range of applications in industrial, biomedical, and OEM products. The flow monitors operate only when fluid flow is positively established. Applications • Pure water control for sample stations • Laser equipment • Pollution sampling equipment Calibration Range * 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. This signal can be used to actuate audible or visual alarms as well as relays, or other control. Piston travel is short which insures low hysteresis. Pressure drop across flow switch varies from 0.035 to 2 psi (at maximum flow rates for air and for liquid). Universal mounted units are outfitted with a spring which resets the piston. Illustrated is the M-50 The spring is held in place Model with 1/8” ports. using an orifice disc. Custom Versions Available Malema welcomes the opportunity to apply its flow sensor experience to work for its customers. Please contact the factory for any special requirements; such as ports, extreme temperature and pressure capabilities, etc. malema flow sensors M-50 Air: 50 - 5,000 scc/m Water: 1 -170 cc/m M-55 Air: 5,000 - 25,000 scc/m Water: 170 - 750 cc/m * For lower and higher trip points contact factory. Maximum flows through switch are higher. Specifications Set Point Accuracy: Repeatability: Hysteresis: ±10% maximum ±2% 15% Material Versions * • Acrylic • 316 Stainless Steel • Aluminum (Anodized) • Teflon® • Brass * Other materials available on request. Port Sizes M-50 • 1/8” FNPT • 1/4” FNPT M-55 • 1/8” FNPT Catalog # 215: 1 Non-Adjustable Flow Switches Operation

Design Considerations/Construction The M-50/55 Series comprises a Body, Piston, and Retaining Rings. Selecting a Flow Switch begins with selecting the body. This series contains one moving part (i.e. the piston) and two retaining rings that are in the fluid path. Construction of the piston is important from a design perspective. We manufacture three types of pistons (it is critical to select the correct piston for your application): 316 Stainless Steel, Teflon Encapsulated, and Special All-Metal piston. [ 1) The standard piston is a 316 Stainless Steel piston with epoxy to hold the magnet in...

Non-Adjustable Flow Switches Installation & Maintenance The standard switch has to be mounted vertically in the position shown above for normally open conditions and inverted position for normally closed conditions. When inverted, the switch set-point will change by ±5%; please use the product in the orientation it was calibrated (as indicated by reading the label). Universal units can be mounted horizontally or vertically. Please advise mounting orientation while ordering, so that the factory can calibrate in the required orientation as calibration does change slightly when changing orientation....

Cut-Away Drawings ORIFICE DISC Fixed Flow Setting Information This model is a FIXED flow switch. The flow set point is fixed at the factory and is NOT field adjustable. Proper calibration of the set point requires the following information. When purchasing a flow switch, use the "Set Point Calibration" form on page i-vi or provide this information on the purchase order. Increasing or decreasing flow, Fluid type (i.e. liquid or gas), Density or specific gravity, System pressure and temperature, Flow direction (i.e. upward or downward), and Mounting orientation (i.e. horizontal or vertical). Ordering...