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A piston flow switch, encapsulating a permanent magnet, is positioned in the flow path within the unit housing. When displaced by the pressure differential from fluid flow, this piston magnetically actuates a hermetically sealed reed switch (SPST or SPDT, depending on the series) within the unit. The piston metering land diameter precisely sets the actuation point by regulating bypass clearance. A stainless steel spring provides positive piston return as flow decreases. The reed switch, when actuated, can be used to operate remote alarms or indicators. Or, it may be integrated into automatic system controls.
An additional, lap-fitting piston is used in Gems Sensors FS-926 Series to accurately detect low-flow rates. Calibration is determined by one or more metering holes in the top of the low-flow piston, which regulates bypass flow, and therefore the actuation setting. When metered bypass flow is exceeded, the resultant pressure differential displaces the low-flow piston, moving the magnet carrier piston to actuate the reed switch. Two large bypass holes in the piston skirt are exposed after actuation to maintain low pressure drop.
The FS-10798 Series offers infinite flow settings from 0.5 to 20 GPM. Versions suitable for gas flow monitoring are also available.
FS-10798 Series Flow Switches are externally adjustable switches that are ideal for protecting machine tools from coolant flow failure, for protecting bearings from loss of lubricant or to assure proper air flow. They offer an infinite number of...
FS-380B Series Flow Switch is a rugged and compact, inline flow switch that features a unique dual-connection port that provides 1/2" NPT and 1/4" push-to-connect fittings. The FS-380B is less susceptible to clogging than other high-pressure...
FS-380 Series Flow Switch is a rugged, inline flow switch that uses 100 micron filtration and is less susceptible to clogging than other high-pressure inline flow switches. The one-piece magnetic PPS composite piston makes the FS-380 ideal for...
FS-380P Series Flow Switches are rugged inline flow switches that resist clogging as well as metal versions. FS-380P is an ideal choice for coolant applications requiring reliable flow detection in HVAC, semiconductor, welding, medical and other...
FS-150 Series Flow Switch are slim, inline switches to reduce pressure drops to a minimum. They incorporate a unique, dual-diameter, internal bore and piston configuration to minimize flow constriction. Liquids are able to smoothly pass around the...
FS-4 Series Flow Switches make flow protection economical for a broad range of industrial applications such as welders, lubrication systems, medical sterilizers and laundry chemicals dispensing. Applications include: Electronic Equipment (Laser...
FS-480 Series Flow Switch is a large-body inline flow switch that delivers ample flow rates with minimal pressure drop an is ideal for processes that push more fluid through their systems and demand low pressure drops. The FS-480 is ideal for...
FS-930 Series Flow Switches have a unique, patented piston design that assures accuracy within 20% over a full range of viscosities - from 40 to 1000 SSU. Ideal for use in applications where liquids of different viscosities are blended or for use...
FS-925 Series Flow Switches provide accurate detection of excessive or insufficient flow rates in a range of applications including protecting against loss of fluid flow in hydraulic systems, assuring proper coolant flow in semiconductor...
FS-927 Series Flow Switches are compact switches that measure only 1" x 2-3/4" (25 mm-70 mm) and are ideal for use where space is at a premium. Designed for use with water and oil, these switches are suitable for high volume OEM applications. They...
