 Download PDF Product Catalogs
Download PDF Technical Sheet Sizes: Type BC1 (“Port Hole”): from 2 to 20 round glasses; Type BC33 and BC 32 (“Long Window”): Single window from size 3 to size 9; Multiple windows from 2 x size 4 to 7 x size 9.
Rating: up to 225 bar and 374 °C
Visible length: From 311 mm to 749 mm. Other on request
Materials: Stainless steel for the body, Forged carbon steel for plates. Other special materials on request
Connections: End connected (flanged, SW or BW), Side connected (flanged, SW or BW), Back connected (flanged, SW or BW) - Condensate pipe on request  
| Features:- In the Bicolour glass level gauges two opposite glasses, protected by mica shields, are fitted in non parallel way (the bicolour glass level gauges has a trapezoidal body)
- A red and a green LED light illuminator is fitted on the back.
When the gauge contains steam, green rays are considerably deviated and prevented from emerging by the observer side; then only red light, whose rays are smoothly deviated by steam, passes through the whole internal hole, reaching the observer. Conversely when rays find water, red rays are considerably deviated and lost inside the internal part of level gauge, green rays can reach the front glass and seen by the observer. Consequently:- The portion of visible length occupied by steam is red
- The portion of visible length occupied by water is green
- "Right-handed" or "Left-handed" according to the position of the shut-off valve compared with the gauge body
- The nominal passage diameter in the gauge is 10 mm
- Brilliant and sure reading
- Applicable optionals and bolting torques
- Bicolor Level Gauges can be outfitted with Remote Transmission of Signal by means of Fiber Optics System "Red Cherry"®,
Application: - On high pressure steam boilers
- Also for low and medium pressure water/steam
Qualifications and Standards:
- ISO 9001:2000
- PED 97/23/EC
- ATEX 94/9/EC
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WO  RKING PRINCIPLE: When in operation, bicolor glass level gauge shows to the observer port holes lighted green in the water zone and port holes lighted red in the steam zone. In case of long glass level gauges, the window appears part green and part red. This result is obtained exploiting the following optical principle:
different colors, in this case: red and green, have a different index of refraction when passing obliquely through different media that are: glass, water and steam.  For the purpose, the gauge body has a trapezoid section with glasses placed on the non parallel faces.
A bicolour light (red and green) LED illuminator (or an illuminator equipped with standard diacroyc lamps and with special red and a green filters) is fitted on the gauge at the opposite side with respect to the observer. This special illuminator conveys light obliquely to the back glasses of the level gauge.
Said filters allow crossing only to red and green rays.
Such colored rays reach, through the back glass, the media inside level body.
When the gauge contains steam, green rays are considerably deviated and prevented from emerging by the observer side; then only red light, whose rays are smoothly deviated by steam, passes through the whole internal hole, reaching the observer. Conversely when rays find water, red rays are considerably deviated and lost inside the internal part of level gauge, green rays can reach the front glass and seen by the observer. Bicolor glass level gauges can be outfitted with Remote Transmission of Signal by means of:  Fiber Optics System "Red Cherry"®, (image on the left) or:- Closed TV circuit,
- Special "periscope" mirrors
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