M-60 Fixed Set point Flow Switch
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Non-Adjustable Flow Switches M-60 Series Fixed setting flow switch with in-line flow Features • For corrosive and non-corrosive liquids or gases • Senses increasing or decreasing flow • Very accurate custom flow settings • Hermetically sealed • All-Teflon® switch available • Universal mounting available Operation 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. The spring is held in place using an Illustrated is the M-60 Model with 1/4” ports. orifice disc. Applications • • • • • • Sample flow monitoring Alarm actuation Purge flows Loss of flow protection Semiconductor etch tools Laser cooling equipment Calibration Range * Air: 25,000 - 55,000 scc/min Water: 750 - 1,600 cc/min * 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 • PVC • Aluminum (Anodized) • 316 Stainless Steel • Brass • Teflon® * Other materials available on request. 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 Port Sizes • 1/4” FNPT Catalog # 217: 1 Non-Adjustable Flow Switches The M-60 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 used in semiconductor, industrial, biomedical, and OEM products. The flow monitors operate only when fluid flow is positively established. The M-60 is available standard with 1/4” FNPT connections.

M-60 Series Design Considerations/Construction The M-60 Series comprises a Body, Piston, and Retaining Rings. Selecting a Flow Switch begins with selecting the body; this series is available in a number of materials. The M-60 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 AllMetal piston. (1) The standard piston...

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 when changing orientation....

M-60 Series 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. • Calibration set point, • Increasing or decreasing flow, • Fluid type (i.e. liquid or gas), • Density or specific gravity, • Viscosity, • System pressure and temperature, • Flow direction (i.e. upward or downward), and • Mounting orientation...