Reflex Level Gauge Glass

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.

Dear my friend, Nice to meet you. This is Rose from Hengshui Aohong Technology Co.,Ltd. We are a professional factory of gauge glass & sight glass. Our products have been exported to many countries. The products are as follows: 1. Reflex gauge glass ( 3 lines 4 grooves ) & Transparent gauge glass 340 x 34(30) x 17mm 320 x 34(30) x 17mm 280 x 34(30) x 17mm 250 x 34(30) x 17mm 220 x 34(30) x 17mm 190 x 34(30) x 17mm 165 x 34(30) x 17mm 140 x 34(30) x 17mm 115 x 34(30) x 17mm 420 x 34 x 17mm 370 x 34 x 17mm 300 x 34 x 17mm and some other special size gauge glass can be customized according to your drawings. 2. Sight glass: round, Rectangular & square , tubular sight glass 3. Glass road stud,reflective glass road studs, reflective road studs. 4. Material: tempered soda lime glass, tempered borosilicate glass, tempered borosilicate 3.3, quartz. 5. Packing: paper box, carton , plywood case. or according to requirement. 6. Gasket: asbestos rubber gaskets ,non-asbestos rubber gaskets, graphite gasket,PTFE gasket,micashield . 7. Printing: we can print on the glass according to requirements. Any question, please feel free to tell me. I will do my best! Thanks&Best regards,

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.

Borosilicate level gauge glass,250*34*17mm.

Transparent type is also manufactured from "extra-hard" borosilicate glass. The surfaces on both sides are finely smooth and ensure optimal transparency. A) One is as same with reflex Gauge Glasses,use molds to make the semi-finished products,afterwards,ground and polish the two side to ensure optimal transparency. By this manufacturing technique,the definition isn't good. B)The other manufacturing technique is made of High Borosilicate sheet of 17mm thickness, cut the glass sheet according the detailed size and polish the side face for the smooth.This manufacturing technique glass is very clear,but the goods cost is higher. It can be used with all media at service conditions up to 6MPa and temperatures up to 430 degrees centigrade. Transparent Gauge Glass Used in Industry Pipe SIZE TypeA Weight L B S g/piece I 115 30 17 118 II 140 30 17 146 III 165 30 17 176 IV 190 30 17 200 V 220 30 17 237 VI 250 30 17 265 VII 280 30 17 303 VIII 320 30 17 334 IX 340 30 17 359 X 370 30 17 391 SIZE TypeB Weight L B S g/piece 0 95 34 17 110 I 115 34 17 132 II 140 34 17 162 III 165 34 17 195 IV 190 34 17 228 V 220 34 17 264 VI 250 34 17 301 VII 280 34 17 338 VIII 320 34 17 387 IX 340 34 17 410 X 370 34 17 461 Green Plain Gauge Glass Transparent Gauge Glass Used in Industry Pipe This green gauge glass is a kind of used in the field of petroleum, chemical industry, metallurgy, electric power, food, medicine. In the other two sides fired green glass glaze. According to the optics refraction principle, in the absence of liquid, from the glass facade, can clearly see the green color on the surface. When the fluid in the liquid level meter, the refractive index of glass and liquid is the same, the color will not be reflected, can see the white. The sizes are all customized according to clients' requests.

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.

Transparent Level Gauge Working Principle Transparent level gauges 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.Transparent Type Level Gauge We can provide the corresponding level glass, please refer to the related products. APPLICATIONS Transparent level gauges are suitable for almost all installations. In fact they permit: the use of mica shields or Polytrifluorochloroethylene shields to protect the glass from the corrosive action of the process fluid the observation of interface the observation of the liquid colour This instrument consists of a metal body, machined to have an internal chamber and one or more front windows (on each side of the gauge). On each window a special high resistance plate transparent glass is applied with sealing joint and metal cover plate hold by bolts and nuts. The chamber is connected to vessel with cross fittings and flanged, threaded or welded ends. Usually, between the instrument and its connecting ends, valves are fitted to consent shut-off piping and to disassemble the level gauge without to empty the vessel. Drain valves can also be fitted to cross fittings device. 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. In some case (i.e. for water / steam) the best reading is obtained by conveying upwards on the surface of separation (liquid/steam or vapor interface), a source of light, located on the back of the gauge, the rays of which are totally reflected down to the observer.