Transparent Glass level gauge Fluid Level Indicator are always fitted with two plate transparent glasses between which the fluid is contained. The fluid level is indicated as the result of the different transparency of the two media and in some cases (for water steam), by conveying upwards on to the surface of separation (between liquid and gaseous substances) a source of light located at the back of the gauge, the rays of which are totally reflected down to the observer.
To avoid leakage in case of glass breakage, safety ball-check device can be provided in cross-fittings or shut-off valves. This kind of indicator is suitable for water/steam. To protect glass surfaces from corrosive action of the process fluid, Transparent Level Gauges can be fitted with Mica shields or Polytrifluorochloroethilene shields. This kind of indicator is suitable for liquids colorless and very fluid.

Features:

1. They do not need electrical power to operate. This can be a great advantage in the case of a power outage.
2. Simple to install – no calibration is necessary.
3. Can be used as a reference to check, or calibrate, other level technologies.
4. Pressure rating from vacuum to 4Mpa.
5. Temperature rating from -20℃ to 450℃
6. Not affected by the chemical or electrical properties of the process liquid.
7. Specific gravity, dielectric, conductivity, surface turbulence, vapor, foam, etc. no longer needs to be considered.

The classification and scope of use of Reflex glass level gauges are as follows:

1. Heat-tracing glass plate level gauge: mainly used for the occasions where the measured medium needs heat preservation;
2. Frost-proof glass plate level gauge: mainly used for occasions where the operating temperature of the medium under test is -196~0℃ and the glass is prone to frosting;
3.Glass plate level gauge without blind area: mainly used in situations where continuous observation is required and blind areas are not allowed in the visual range;
4. Two-color glass plate level gauge: mainly used for occasions where the medium is colorless and transparent liquid and liquid level is not easily observed;
5.Uv - proof glass plate level gauge:mainly used for the occasions where the measured medium is afraid of ultraviolet light;
6. Wide liquid chamber glass plate level gauge: mainly used for occasions where the viscosity of the measured medium is relatively large or the volume of the instrument is relatively large;
7. Illuminating glass plate level gauge: mainly used for night observation.

Model	TBS-F	TBS-A	TBS-HR	TBS-HT	RFL-40C
Type	Reflex type	Transparent type	High pressure reflex type	High pressure Transparent type	90 degree Quick open/close type
C-C (mm)	325-3600				285-2590
Visible Length (mm)	95-3360				141-2433
Level Gauge Material	CS、SS304、SS316L、Ti、etc				Cast steel
Glass Material	Borosilicate; Alumina-silicate
Gasket Type	Graphite composite gasket; non-Asbestos gasket; Mica seal components
Working temperature ℃	≤450℃
Working pressure Bar	40 (Groove glass) 100 (Plate glass)	100 (Plate glass)	40 (Groove glass) 160 (Plate glass)	160 (Plate glass)	40 (Groove glass)

Comparison Between Transparent Glass Plate Level Gauge & Reflex Glass Plate Level Gauge

1. Working Principle

Transparent Type

Two flat transparent glass plates are installed on both sides of the valve body. Light passes straight through two layers of glass and the medium inside. Operators directly see liquid and gas zones by naked eyes.

Reflex Type

Only one piece of special prism glass is fitted on the front side. The back surface of the glass has serrated triangular grooves.

Gas section: Light reflects fully, appears silver-white
Liquid section: Light refracts into liquid, appears black

Clear contrast forms automatically without extra lighting.

2. Visual Effect & Identification

Transparent: Real color of medium visible; liquid-gas boundary is obvious but contrast is weaker for colorless clear liquids. Suitable for colored, turbid media.
Reflex: Sharp black-white dividing line between liquid and vapor, extremely easy to read even from far distance. Not ideal for dark, highly viscous or solid-containing media.

3. Application Medium

Transparent Glass Level Gauge

Colored liquids, viscous liquids, slurry with tiny particles
High-temperature steam, oil, chemical solvents, wastewater
Scenarios requiring observation of material color, bubbles, sediment

Reflex Glass Level Gauge

Clear, colorless media: pure water, clean condensate, light oil
Boiler feed water, clean tank water, low-viscosity transparent fluid
Low impurity working conditions

4. Pressure & Temperature Resistance

Transparent: Double-glass structure, higher overall strength; available for medium and high pressure working conditions.
Reflex: Single prismatic glass, limited pressure grade; mostly used for medium-low pressure vessels and boilers.

5. Installation & Auxiliary Lighting

Transparent: Needs lighting from the back side in dim environments for clear viewing.
Reflex: Self-forming light contrast; backlight is unnecessary under normal ambient light.

6. Maintenance & Service Life

Transparent: Two glass plates to replace if damaged; sealing gaskets on both sides. More cleaning work for double glass surfaces.
Reflex: Only one glass piece; the serrated groove side easily accumulates scale, which weakens light reflection and affects reading accuracy, requiring frequent descaling.

7. Cost

Reflex type: Lower cost, simple structure
Transparent type: Higher cost due to double glass and matched flanges/cocks

Summary for Product Introduction

Transparent glass plate level gauges adopt double-sided transparent glass to directly display the real state of internal media, applicable for colored, turbid and viscous fluids with higher pressure resistance. Reflex glass plate level gauges use grooved prism glass to form distinct black-white liquid-gas dividing lines via light reflection, easy to read at a distance and cost-effective, only suitable for clean, colorless transparent media under low to medium pressure.

Transparent Reflex Glass water Level Gauge

Reasons to Choose Glass Plate Level Gauges

Direct visual reading
It shows liquid level directly without signal conversion. Operators can observe real-time liquid level on site with no complicated calibration.
Wide adaptability to working conditions
Available in reflex, transparent and mica types. They handle high temperature, high pressure, corrosive media, and fit boilers, tanks and pressure vessels.
High reliability & long service life
Made of pressure-resistant gauge glass and sturdy steel body. Equipped with safety ball valves to prevent leakage if glass breaks, ensuring stable long-term operation.
Low maintenance cost
Simple structure with few vulnerable parts. Easy to replace glass plates and gaskets; no power supply required during use.
Standard reference measuring instrument
It acts as the benchmark to calibrate remote transmitters, widely recognized in chemical, power and heating industries.

Super Concise Version (Short Description for Listing)

Glass plate level gauges offer direct, intuitive on-site liquid level display. They withstand high temperature and high pressure with complete safety protection. Simple structure, low maintenance and stable performance make them the preferred local level measuring device for boilers and industrial storage tanks.

Transparent Glass level gauge Fluid Level Indicato