Flow Instruments

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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.

  • 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.

  • 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.

  • 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.

  • 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.


  • 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.

  • 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.

  • 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.

  • 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.

  • 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.