Reflex Level Gauge Glass

Factory-direct reflex level gauge glass — grooved borosilicate glass plates used in reflex-type liquid level gauges for clear, high-contrast visual monitoring of fluid levels in boilers, steam systems, pressure vessels, and process equipment. The prismatic groove pattern reflects light differently through liquid and vapor phases, making the liquid level instantly visible without additional lighting.

How Reflex Level Gauge Glass Works

The grooved surface of reflex glass uses total internal reflection: the liquid phase appears dark, while the vapor/gas phase appears bright silver. This creates a sharp, unambiguous liquid-level boundary — ideal for high-pressure and high-temperature applications where transparent glass may be harder to read.

Key Properties

  • Material: Borosilicate glass (3.3) — superior thermal shock and chemical resistance
  • Max. operating temperature: Up to 400°C
  • Max. operating pressure: Up to 64 bar (depending on size and thickness)
  • Surface: Precision-ground prismatic grooves for optimal light refraction
  • Chemical resistance: Resistant to most acids, alkalis, and process fluids (except HF)
  • Custom sizes: Length, width, and thickness available to specification

Standard Dimensions

Parameter Standard Range
Length 100mm – 1500mm (custom available)
Width 20mm – 60mm
Thickness 10mm – 25mm

Reflex vs. Transparent Level Gauge Glass

Feature Reflex Transparent
Readability High contrast, easy to read Direct visual, see fluid color
Max pressure Up to 64 bar Up to 40 bar
Best for Steam, boilers, high-pressure vessels Colored fluids, interface detection

Typical Applications

  • Industrial boilers and steam generators — water/steam level monitoring
  • High-pressure chemical reactors and autoclaves
  • Petrochemical and refinery process vessels
  • Power plant feedwater heaters and deaerators
  • Pharmaceutical pressure vessels

Compatible Accessories

Pair with PTFE or fluororubber gaskets for leak-free installation. For transparent-type gauges, see our Transparent Level Gauge Glass collection.

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