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  • Sight Glass

  • Sight Glass / Gauge Glass

    Supplying you with industrial grade Sight Glass in styles such as Reflex, Tubular (High-Pressure & Heavy Wall), as well as the Keystone exclusive Gauge Glass Guardian.

    • Liquid level gauges are placed on boilers, storage tanks, or other vessels to provide a visual indication of how much liquid is present. Several different styles are available:
    • Tubular liquid level gauges are comprised of an upper and lower valve with a tube-style sight glass covering the distance between them. This tube can be clear or have a contrast line along its length.
    • Reflex liquid level gauges are manufactured with molded vertical grooves on the back side of the glass panel which is secured within a metal frame.  Depending on whether the glass panel is in contact with liquid or not, the grooves will either reflect or refract any external ambient light thus enabling easy viewing of the liquid level.
    • Flat liquid level gauges are similar to the reflex style except that the back side of the glass panel is the same as the front.  The separation between liquid and non-liquid is not as easily seen with this style of level gauge

    When installed on boilers, TSSA (Technical Standards and Safety Act, 2000, O.Reg. 219/01) states;

    Gauge glass safety devices

    40. (1) A tubular gauge glass shall be shielded with a glass or plastic guard that shields the front and sides of the glass so as to prevent injury to any person in the event of the gauge glass breaking.

         (2) Tubular gauge glass shut-off valves shall be equipped with stainless steel ball checks as a component of the valve’s construction.

    Keystone Steam Supplies offers ‘Gauge Glass Guardian’ (High Temperature/High Pressure resistant Polycarbonate shields) in multiple diameters and lengths as well as full liquid level gauge and replacement tubular reflex and flat sight glass. 

    Keystone Steam Supplies offers full liquid level gauge sets as well as replacement tubular and reflex sight class.

    Features:

    • TSSA compliant liquid level gauge sets
    • Non-TSSA liquid level gauge sets are also available for off-boiler applications
    • Reflex liquid level gauge sets
    • Sets for high pressure and low pressure applications
    • High point assemblies, complete with chain operated gauge cocks
    • Reflex and Flat sight/gauge glass (flat)
    • Tubular sight/gauge glass
      • Heavy wall - clear
      • Heavy wall - red line
      • High pressure - clear
      • High pressure - red line
    • Gauge Glass Guardian

    Applications:

    • Boilers
    • Pressure vessels
    • Industrial and commercial liquid storage tanks

    Click below to learn more about the types of sight glass and gauge glass products we carry. 

  • Reflex sight glass is flat and allows the operator to view the reading on the instrument dial.

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    Reflex Sight Glass

    Reflex Sight Glass

    Reflex sight glass is flat and allows the operator to view the reading on the instrument dial.

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  • Tubular sight glass comes in both clear and red-line models for both standard and high-pressure applications.

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    Tubular Sight Glass

    Tubular Sight Glass

    Tubular sight glass comes in both clear and red-line models for both standard and high-pressure applications.

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  • Gauge Glass Guardian is a clear polycarbonate tube that shields tubular gauge glass and protects it from damage.

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    Gauge Glass Guardian

    Gauge Glass Guardian

    Gauge Glass Guardian is a clear polycarbonate tube that shields tubular gauge glass and protects it from damage.

    More Info

  • Keystone Steam Supplies is here to help you with your sight glass needs.