The Gems Sensors FS-10798E series is an externally adjustable piston-type flow switch designed for reliable flow/no-flow detection in liquid and gas media. It is ideal for protecting machine tools from coolant flow failure, safeguarding bearings from lubricant loss, and ensuring proper air flow in pneumatic systems. The switch offers an infinite number of flow settings, from 0.5 to 20 GPM (1.8 to 75.7 L/min) for liquids, and operates at pressures up to 1000 psig (69 bar).

Key Features

• External Adjustment: The flow set point is easily adjustable using a standard flat-blade screwdriver. A set-screw locks the adjustment to prevent tampering or accidental changes after field calibration.
• Low Pressure Drop: The optimized internal design minimizes pressure drop, reducing pumping energy requirements and maintaining system efficiency.
• High Repeatability: Offers precise repeatability with a maximum deviation of 1%, ensuring consistent switching performance.
• SPDT Switch Output: Provides a single-pole, double-throw (SPDT) changeover switch rated at 20 VA, suitable for direct control of pumps, alarms, or PLC inputs.
• Multiple Construction Materials: Available in brass or stainless steel (316 SS) body materials to match a wide range of media compatibility requirements.
• Versatile Port Size: Features a 1/2" NPT female connection, compatible with standard industrial piping.
• Wide Temperature Range: Operates reliably with media temperatures up to +107.2°C (+225°F).

Technical Specifications

• Media Compatibility: Water, oils, gases, and other non-aggressive liquids.
• Flow Rate (Air/Gases): See manufacturer chart for specific gas flow settings.
• Wetted Materials: Body: Brass or 316 Stainless Steel; Piston: Polysulfone; O-rings: Viton; Spring: 316 Stainless Steel.
• Electrical Connection: 18 AWG, 24" (61 cm) PVC insulated leads.
• Switch Type: SPDT, 20 VA resistive load.
• Mounting Orientation: Any position; flow direction must be indicated by arrow on body.

Applications

The FS-10798E series is widely used across various industries for flow monitoring in:

• Machine tool coolant systems (flow failure protection)
• Bearing lubrication circuits (loss of lubricant detection)
• Air flow verification in pneumatic systems
• Electronic equipment cooling (laser heads, welders, power supplies, high-speed spindles, X-ray tubes, semiconductor equipment)
• Processing and dispensing equipment (water purification, filtering, X-ray film processing, beverage dispensing, chemical additives, gas sampling, distilling)
• General industrial automation and pump protection