Flow Switches

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  • Gems FS-10798 Flow Switch

    Item Type Media Type Connection Size Technology
    OEM Air/Gas, Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1/8 - 3/4 Piston

    Gems® type FS-10798 switches are externally adjustable for water, oils, and gases. This makes them ideal for protecting machine tools from coolant flow failure, protecting bearings from loss of lubricant, or assuring proper air flow. They offer an infinite number or flow settings at pressures up to 1000psig, with low pressure drop and precise repeatability. The adjusting vane is easily field adjustable using an ordinary flat-bladed screwdriver. The adjustment is set-screw-locked for tamper-free operation after field calibration.

    Data Sheet
  • Gems FS-150 Flow Switch

    Item Type Media Type Connection Size Technology
    OEM Corrosive Chemicals, Water (Clean) or Similar Liquids 1/8 - 3/4 Piston

    Gems® type FS-150 switches have a straight flow path with low pressure drop. They incorporate a unique, dual-diameter, internal bore and piston configuration to minimize flow constriction. Liquids are able to smoothly pass around the piston and flow through the switch with little pressure loss to the down stream line.

    Data Sheet
  • Gems FS-200 Flow Switch

    Item Type Media Type Connection Size Technology
    Hazardous Location, Industrial, OEM Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1 - 1 1/2, 2 - 3 Shuttle

    Gems® type FS-200 switches are general purpose, straight-through flow path switches. They offer accurate flow detection, with 1% repeatability, over a broad range of flow settings and port sizes. Their durable construction delivers long-life reliability in either water or oil. Generous flow paths keep pressure drop low. These switches are ideal for detection of improper flow rates in high volume lubrication, cooling, or process systems. They are available in a fixed or adjustable setting type.

    Data Sheet
  • Gems FS-380 Flow Switch

    Item Type Media Type Connection Size Technology
    OEM Corrosive Chemicals, Water (Clean) or Similar Liquids 1/8 - 3/4 Piston

    Gems® type FS-380 switches are compact flow switches for high inline pressures. They require 100 micron filtration and are less susceptible to clogging than other high-pressure inline flow switches. The one-piece magnetic PPS composite piston makes the FS-380 ideal for high-pressure applications such as industrial cleaning equipment. It is also an excellent choice for semicon cooling applications where simple design and reliable operating are required.

    Data Sheet
  • Gems FS-380p Flow Switch

    Item Type Media Type Connection Size Technology
    OEM Corrosive Chemicals, Water (Clean) or Similar Liquids 1/8 - 3/4 Piston

    Gems® type FS-380P switches industrial strength inline plastic flow switches offer the same superior performance to non-clogging as their metal cousins (FS-380). The fixed set point and simple design make them dependable switches. The FS-380P is an ideal choice for coolant applications requiring reliable flow detection in HVAC, semiconductor, welding, medical and other industries. ¼” quick disconnect units have a host of snap-on mating adapters to fit most piping requirements.

    Data Sheet
  • Gems FS-4 Flow Switch

    Item Type Media Type Connection Size Technology
    OEM Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1/8 - 3/4 Piston

    Gems® type FS-4 switches are low cost, molded plastic construction that make flow protection economical for a broad range of industrial applications such as welders, lubrication systems, medical sterilizers, and laundry chemicals dispensing.

    Data Sheet
  • Gems FS-400 Flow Switch

    Item Type Media Type Connection Size Technology
    Hazardous Location, Industrial, OEM Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1/8 - 3/4 Shuttle

    Gems® type FS-400 switches are general purpose, 90° flow path switches. They provide accurate flow detection in water and oil with 1% repeatability. Flow settings on the adjustable version can be easily changed without disassembly. A shuttle bypass vane inside the housing is controlled externally using an ordinary flat-blade screwdriver. These switches are ruggedly constructed of non-corrosive materials and resist shock and vibration. Suitable for triggering alarms on interlocking shutdown circuitry when flow rate is improper to protect bearings, gears, and cooling systems.

    Data Sheet
  • Gems FS-400p Flow Switch

    Item Type Media Type Connection Size Technology
    Industrial, OEM Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1/8 - 3/4, 1 - 1 1/2 Shuttle

    Gems® type FS-400P switches are low cost units for plastic piping. They are designed for low cost flow/no-flow monitoring. This series is available with a clear transparent PVC housing which is ideal for use where visual flow confirmation is desirable. These corrosion-resistant switches offer broad chemical compatibility. With only one moving part, their rugged construction offers long life with minimum maintenance. They are ideal for water heating or purification, equipment cooling and general chemical processing use.

    Data Sheet
  • Gems FS-480 Flow Switch

    Item Type Media Type Connection Size Technology
    OEM Corrosive Chemicals, Water (Clean) or Similar Liquids 1/8 - 3/4 Piston

    Gems® type FS-480 switches are stainless steel flow switches for large flow and low pressure drop. They are 25% larger than their FS-380 siblings and ideal for processes that push more fluid through their systems and demand low pressure drops. Designed to accommodate the semiconductor industry's move to larger 300mm wafer & cross-over equipment, this switch is also perfect for critical medical equipment applications. A glass-reinforced PPS piston and forged 316 stainless steel body make this sensor rugged enough for high pressure lubrication and cooling systems as well. This simple, yet meticulously perfected design provides the reliability required in critical applications while allowing for much lower pressure drop rates than other switches.

    Data Sheet
  • Gems FS-500 Flow Switch

    Item Type Media Type Connection Size Technology
    Industrial, OEM Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1/8 - 3/4 Shuttle

    Gems® type FS-500 switches are low cost units for threaded plastic piping. They offer low cost flow monitoring with a variety of switch actuation points and low pressure drop. All wetted parts are polypropylene or stainless steel, making this switch ideal for a wide range of chemical and temperature requirements. The materials are also NSF or FDA approved for potable water treatment applications including chlorinators, purifiers, and heaters. The FS-500 is ideal for equipment cooling including welders, lasers, etc. A J-box version with a 5 amp relay is also available for direct control of higher electrical loads, such as chlorinator pumps.

    Data Sheet
  • Gems FS-550 Flow Switch

    Item Type Media Type Connection Size Technology
    Hazardous Location, Industrial, OEM Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1 - 1 1/2 Paddle

    Gems® type FS-550 high pressure, metal paddle switches sense liquid flow in either direction to monitor flow/no-flow conditions. They are supplied in two paddle lengths. The paddle is trimmed during installation to permit switch actuation at the desired flow rate. As flow increases in a pipe, the paddle of the switch pivots to move out of the liquid path, producing less than 3psig of pressure drop regardless of pipe size.

    Data Sheet
  • Gems FS-600 Flow Switch

    Item Type Media Type Connection Size Technology
    Industrial, OEM Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids, Water (Dirty) 1/8 - 3/4, 1 - 1 1/2 Thermal Dispersion

    Gems® type FS-600 switches use proven thermal dispersion technology to provide a robust no moving part flow switch even without filtration. The solid state sensor is compatible with both conductive and non-conductive fluids. It is suitable for fluids with particulates or slurries, and is immune to changes in media viscosity. The straight through switch is designed for a long life and can be mounted in any orientation to handle a wide range of flow rates. No moving parts means years of reliable service.

  • Gems FS-925 Flow Switch

    Item Type Media Type Connection Size Technology
    OEM Air/Gas, Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1/8 - 3/4 Piston

    Gems® type FS-925 general purpose switches provide reliable and consistent performance with repeatability within 1%. They are factory preset for actuation at specified flow rates. They provide accurate detection of excessive or insufficient flow rates in such applications as: protecting against loss of fluid flow in hydraulic systems, assuring proper coolant flow in semiconductor processing equipment, monitoring high pressure lubrication systems, and ensuring proper air flow in water/waste systems.

    Data Sheet
  • Gems FS-926 Flow Switch

    Item Type Media Type Connection Size Technology
    OEM Air/Gas, Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1/8 - 3/4 Piston

    Gems® type FS-926 low flow switches provide reliable and consistent performance with repeatability within 1%. They are factory preset for actuation at specified flow rates. They provide accurate detection of excessive or insufficient flow rates in such applications as: protecting against loss of fluid flow in hydraulic systems, assuring proper coolant flow in semiconductor processing equipment, monitoring high pressure lubrication systems, and ensuring proper air flow in water/waste systems.

    Data Sheet
  • Gems FS-927 Flow Switch

    Item Type Media Type Connection Size Technology
    OEM Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1/8 - 3/4 Piston

    Gems® type FS-927 compact switches measure only 1″ x 2¾” 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 are ideal for coolant or lubricant flow monitoring in portable equipment and many other applications with space constraints.

    Data Sheet
  • Gems FS-930 Flow Switch

    Item Type Media Type Connection Size Technology
    Hazardous Location, OEM Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1/8 - 3/4 Piston

    Gems® type FS-930 oil flow switches compensate for viscosity change in fluids. Their unique, patented design assures accuracy witin 20% over a full range of viscosities – from 40 to 2000 SSU. They are ideal for use in applications where liquids of different viscosities are blended, or for use in lubrication systems where oil flow monitoring is critical at start-up. Each unit is factory preset using 300 SSU oil for actuation at specified flow rates and compensates for viscosity changes automatically.

    Data Sheet
  • Gems RFS Flow Switch

    Item Type Media Type Connection Size Technology
    Industrial, OEM Corrosive Chemicals, Water (Clean) or Similar Liquids 1/8 - 3/4, 1 - 1 1/2 Paddle Wheel

    Gems® type RFS RotorFlow switches build an extra level of reliability and protection into your equipment. Once set to a desired actuation point, RotorFlow will switch to a “no-flow” condition should the rotor stop for any reason. Typical applications include semiconductor processing equipment, lasers, medical equipment, X-ray and other high power tubes, and robotic welding equipment.

    Data Sheet
  • Harwil Q-1 Flow Switch

    Item Type Media Type Connection Size Technology
    Industrial Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1/8 - 3/4 Paddle

    Harwil® type Q-1 industrial flow switches are designed for extreme, long-term reliability. They detect and signal flow change and remain continuously adjustable while in operation. Six interchangeable orifices have 2:1 continuous switch adjustment. They are calibrated independent of line pressure and temperature, and maintain calibration limits when subjected to reasonable line hydraulic hammer or surge pulses. A DPDT model is available upon request.

    Data Sheet
  • Harwil Q-10N/Q-10VCR Flow Switch

    Item Type Media Type Connection Size Technology
    OEM Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1 - 1 1/2 Paddle

    Harwil® type Q-10N & Q-10VCR switches are provided with three factory adjustable parameters – paddle area, length, & stiffness – which provide performance flexibility to meet a multitude of applications. They respond to fluid flow only, independent of line pressure and temperature. A positive stop eliminates fatigue effects of turbulence, vibration, and flow surge on flow detecting element. Their small size and low profile provides easy mounting in crowded installations.

    Data Sheet
  • Harwil Q-12N/Q12CR Flow Switch

    Item Type Media Type Connection Size Technology
    OEM Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1/8 - 3/4 Paddle

    Harwil® type Q-12N & Q-12CR switches are provided with three factory adjustable parameters – paddle area, length, & stiffness – which provide performance flexibility to meet a multitude of applications. A positive stop eliminates fatigue effects of turbulence, vibration, and flow surge on flow detecting element. They have a very low pressure drop, typically less than 1.0psig at normal flow rate. Their small size and low profile provides easy mounting in crowded installations.

    Data Sheet
  • Harwil Q-16 Flow Switch

    Item Type Media Type Connection Size Technology
    Industrial, OEM Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1 - 1 1/2 Paddle

    Harwil® type Q-16 switches are used to signal, start, or stop electronically operated equipment when flow or no-flow conditions occur. Harwil’s patented elastomeric sealing system is superior to the metal bellows that are subject to metal fatigue and corrosion. This seal system has been field-proven for over a decade.

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    Data Sheet
  • Harwil Q-4 Flow Switch

    Item Type Media Type Connection Size Technology
    Industrial Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1 - 1 1/2 Paddle

    Harwil® type Q-4 industrial flow switches are designed for extreme, long-term reliability, and for use in particle contaminated fluids. They detect and signal flow change and remain continuously adjustable while in operation. Four individual paddle options plus continuous adjustment provide a wide operating range. They maintain calibration limits when subjected to reasonable line hydraulic hammer or surge pulses. A DPDT model is available upon request.

    Data Sheet
  • Harwil Q-5/Q-5SS Flow Switch

    Item Type Media Type Connection Size Technology
    Industrial Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1 - 1 1/2 Paddle

    Harwil® type Q-5 & Q-5SS industrial flow switches are designed for extreme, long-term reliability, and for use in particle contaminated fluids. Multiple quick change paddles and continuous spring adjustment provide an incredibly wide operating range of flow rates and viscosities. They are calibrated independent of line pressure and temperature, and maintain calibration limits when subjected to reasonable line hydraulic hammer or surge pulses. A DPDT model is available upon request.

    Data Sheet
  • Harwil Q-8DS/QD-8DS Flow Switch

    Item Type Media Type Connection Size Technology
    Industrial Corrosive Chemicals, Water (Clean) or Similar Liquids 1 - 1 1/2 Paddle

    Harwil® type Q-8DS & QD-8DS industrial flow switches are designed for long-term reliability and chemical resistance. They detect and signal flow change and respond to flow only, independent of line pressure, temperature, or environment. They offer super simple maintenance and checkout for personnel using a standard test meter.

    Data Sheet
  • Harwil Q-8N/Q-8CR Flow Switch

    Item Type Media Type Connection Size Technology
    Industrial Corrosive Chemicals, Water (Clean) or Similar Liquids 1 - 1 1/2 Paddle

    Harwil® type Q-8N & Q-8CR industrial flow switches are designed for long-term reliability and chemical resistance. They detect and signal flow change and remain continuously adjustable while in operation. Particle contamination resistance is provided by a single convolute elastomeric seal which is continually flushed by working fluid flow.

    Data Sheet
  • Kobold DW Flow Switch

    Item Type Media Type Connection Size Technology
    Industrial Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1/8 - 3/4, 1 - 1 1/2, 2 - 3 Paddle

    Kobold® type DWU, DWN, and DWS flow meters and flow switches are based on the paddle, or static plate, principle. This type of arrangement is ideal for use in applications where dirt and solid grain contaminants are of concern. The paddle-bellows design offers large internal clearances and mechanical insensitivity to a wide range of particulate matter.

    Data Sheet
  • Kobold FPS Flow Switch

    Item Type Media Type Connection Size Technology
    Industrial Corrosive Chemicals, Water (Clean) or Similar Liquids 1 - 1 1/2 Paddle

    Kobold® type FPS paddle-bellows flow switches are used wherever reliable control for minimum or maximum liquid flow is required. The interchangeable paddles, in conjunction with an external adjustment screw, allow for adjustment over a wide range of switching points and easy adaptation of the flow switch to different pipe sizes. The internals of the instrument are separated from the process by the bellows, making it an excellent choice for dirty media. The FPS-6 Series is a special design variation used when lower switching points are desirable.

    Data Sheet
  • Kobold PPS Flow Switch

    Item Type Media Type Connection Size Technology
    Industrial, OEM Corrosive Chemicals, Viscous Liquid (Oils, Syrups, etc.), Water (Clean) or Similar Liquids 1 - 1 1/2 Paddle

    Kobold® type PPS Polysulfone paddle flow switches are for pipes 1″ and larger, and combine reliability with an economical price. They are also virtually maintenance free. The pressure drop across the instrument is negligible. It is available with either a normally open, normally closed, or SPDT reed switch contact.

    Data Sheet
  • Kobold PS/PSR Flow Switch

    Item Type Media Type Connection Size Technology
    OEM Corrosive Chemicals, Water (Clean) or Similar Liquids 1/8 - 3/4, 1 - 1 1/2 Paddle

    Kobold® type PS & PSR paddle flow switches can be used wherever a simple economic yet reliable monitoring instrument is required for flow switching applications. A movable reed switch allows the contacts to be set either normally open (N/O) or normally closed (N/C).

    Data Sheet