Gauge Glass

31/07/2018 Community Activities

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Description

Gauge Glass/Level Sight Glass Used in Industry Pipe
Gauge glass also named sight glass or level gauge glass. According to the application requirement for pressure and temperature, different material is used. Each type max working temperature is shown below.

Soda-lime glass (window glass) widely used for lower cost, working temperature up to 230 °C.
Borosilicate glass particularly useful for applications in aggressive environments (acids, alkali, water vapor), working temperature up to 350 °C.
Aluminosilcate glass have similar properties to borosilicate glass, but with better chemical resistance and higher permissible operating temperature of up to 600 °C.
Quartz glass has long range light transmittance (from ultraviolet to infrared), and its operating temperature is up to 1100 °C.
Classification:
Round Sight glass:
Description
It is mainly used to observe the level of the boiler or other equipment filled with liquid, also can be used as watching glass window for thermal and chemical reaction.
There are four pieces of different sizes sight glass.
GG-01: Different dimension round sight glass with clear surface and well grinding edge finish used in flange.There are two pieces of round sight glass with hole in the center.
GG-02: Round sight glass with a hole in the center make it convenient to clear the surface of the glass.
There are two pieces of round sight glass of 10.18 mm and 30.47 mm thickness.
We can produce wide range dimension of round sight glass.
Dimensions of round sight glass.
Transparent level gauge glass:
Transparent (smooth) level gauge glass is used to observe the liquid level of the boiler or other liquid tanks. Due to the boiler water high temperature and pressure working environment, borosilicate or aluminosilcate glass is used to meet the requirement.
There is tree piece of thick strip gauge glass with clear surface and polishing edge.
GG-03: Strip gauge glass are used in industry to observing the flow of liquid and liquid level.There is tree piece of strip gauge glass of heavy thickness.
GG-04: Thick strip gauge glass make it can withstand acid, alkali, high temperature and high pressure.
Types:
According to the width and thickness of the glass, mainly four types are classified.
type A: width 30 mm, thickness 17 mm.
type B: width 34 mm, thickness 17 mm.
type H: width 34 mm, thickness 22 mm.
type TA 28: width of 27.6 mm, 16.8 mm.
Dimensions:
There is a drawing of transparent level gauge glass to describe the length, height and width.
GG-05: Transparent level gauge glass drawing, the L, W and H in following chart are according to this picture.
Glasses are all made strictly according with DIN7081.
Gaskets and mica sheet can also be provided together.
Working temperature and pressure
Borosilicate glass can withstand up to 400 °C, 180 bar. Aluminosilcate glass can work up to 660 °C, 180 bar.
Reflex gauge glass:
Reflex gauge glass are used to read the water level of the boiler or tank. It have 3, 4 grooves longitudinal printed on the glass. The grooves in water can help increase the angle of refraction, so the visibility of the liquid level is much better then without grooves.
With the grooving increases the angle of refraction which makes the visibility of the liquid level is much better than when using smooth glass.
A pieces of reflex gauge glass with one groove is on the ground.
GG-06: The reflex gauge glass with one groove makes the liquid level clear.Two pieces of reflex gauge glass with three grooves of different dimension is on the ground.
GG-07: The reflex gauge glass with more grooves can be supplied together with gasket to seal and buffer the extrusion.
Types
type A - width 30 mm, thickness 17 mm.
type B - width 34 mm, thickness 17 mm.
type H - width 34 mm, thickness 22 mm.
Type C - width of 20 mm, thickness 12 mm.
Type D - width 25 mm, thickness 15 mm.
Dimensions:
There is a drawing to describe the length, height and width of the reflex gauge glass.
GG-08: Reflex gauge glass drawing, the L, W and H of reflex gauge glass in the following chart are according to this picture.
Glasses are all made strictly according with DIN7081.
Gaskets and mica sheet can also be provided together.
Working temperature and pressure
Borosilicate glass can withstand up to 400 °C, 180 bar. Aluminosilcate glass can work up to 660 °C, 180 bar.
Chemical and physical properties
1. Chemical composition SiO2 AL2O3 B2O3 Na2O + K2O
80.00% 2.8% 12.8% 3.8%
2.Chemical Durability Water-resistance Acid-resistance Alkali resistance
<0.5 mg/cm2 <0.5 mg/cm2 <80 mg/cm2
3.Thermal stability △T150 °C, temperature <260 °C
4.Bending strength ≥1100 kgf/cm2
5.Hydraulic power -10°C, 16 kg/cm2
6.Transmittance ≥90 %/mm2
7. Appearance

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