Ibr Approved Reflex Level Gauge

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Reflex Sight Glass Reflex level gauge glass is made from High Borosilicate, They are used in level gauge in boiler for water position. Reflex type one side facing the medium chamber is provided with molded grooves set at 90 degree angles. The molding process increases the resistance of the glass grooves to wear; the skin which the glass attains during molding gives it maximum smoothness and hardness. This makes it extremely resistant to the attack of boiler water Specifications * Material: borosilicate glass, aluminosilicate glass. * Max pressure: 4Mpa. * Max temperature: 430 �°C. * Grooves: one, two, three or four grooves. * Using life: more than 20 years. * Standard: The products is strictly according to the standard of DIN7081. * Accessories: Gaskets and mica sheet can also be provided together.

Reflex gauge glass is used to read the medium level in the boiler or other tanks. The one side of the glass which is exposed to the medium has a prismatic surface and another side is smooth. The medium level inside the level gauge is indicated as the result of the light refraction principle, since the liquid filled area completely absorbs the rays of light and appears dark, whereas the rays of light are totally reflected in the gas/air filled area which appears bright. Reflex gauge glass is made from high borosilicte glass. It has many advantages, such as cheap, low maintenance cost, easy level reading and excellent high temperature & pressure resistance. Its working pressure can be up to 4 MPa and working temperature can be up to 430 C. The edge can be polished or frosted.

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Reflex Level Gauge WORKING PRINCIPLE Reflex glass level gauges working principle is based on the light refraction and reflection laws.Reflex Level GaugeReflex glass level gauges use glasses having the face fitted towards the chamber shaped to have prismatic grooves with section angle of 90�°. When in operation, the chamber is filled with liquid in the lower zone and gases or vapors in the upper zone; the liquid level is distinguished by different brightness of the glass in the liquid and in the gas/vapor zone. The reflex level gauges do not need a specific illumination: the day environmental light is enough. Only during the night an artificial light must be provided. The different brightness in the two zones is obtained as explained below: LIQUID ZONE This zone appears quite dark when the gauge is in operation and lighted as above said. Given the construction, most of the environmental light rays incident on the external face of the glass are quite perpendicular to said face and, therefore, not deviated by the glass. These rays reach the glass/liquid interface with an inclination of approx. 45�°. The critical angle glass/liquid is always superior to 45�°. Therefore the rays incident within the critical angle (practically the totality) are refracted within the liquid and, since the internal walls of the gauge chamber are not reflecting, the rays cannot be seen from the outside. In fact the zone will appear dark, nearly black, to the observer. GAS/VAPOR ZONE This zone appears almost silver bright to the observer. As for the liquid zone, the light rays reach the glass/gas-vapor interface with an angle around 45�°. Since this angle is greater than glass/gas-vapor critical angle, the rays are not refracted , but totally reflected making 90�° turn, thus reaching the nearest glass/gas-vapor interface again with angle of 45�°. For same reason they will be reflected and turned by 90�° towards the observer, to whom the zone will appear silver bright. APPLICATIONS Reflex glass level gauges can be used in most of the cases and offer great advantages in terms of: low initial cost, low operating cost, easy level reading. Reflex level gauges cannot be used in certain cases as for example: when the separation level between two liquids has to be read (interface). when besides the level indication, the observation of the liquid colour is required. when the process fluid is high-pressure water steam, since in this case the glass must be protected from the solvent action of the boiler water by using mica shields. when the process fluid is such that can corrode the glass (e.g. high temperature alkaline solutions or hydrofluoric acid), since ica shields or Polytrifluorochloroethylene shields must be used to protect the glass.

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