Reflex Level Gauges

Designed and Made in Italy

The level is ascertained using a glass which has a smooth side and a wetted prismatic side. The level of the fluid inside the level gauge is shown by using the optical principles of refraction: the wetted part fully absorbs light and so the fluid appears to be black. The part in contact with the gas, on the other hand, fully reflects light and so the gas appears to be of a very light colour.

Download data sheet - PDF

The product line includes level gauges suitable for pressure ratings from PN10 to PN250 and a huge number of industrial process applications.


This type of gauge is recommended:

  • for taking clear and simple readings (see counter-indications below)
  • if you are looking for an inexpensive gauge which will also save you money on maintenance costs


Operating limits / Conditions:

Process:

  • Max. pressure: 255,5 bar @ 38°C (rating class 1500)
  • Max. temperature: 300°C (max. temperature allowed by borosilicate glasses as per the DIN 7081 standard)

Steam:

  • Max. pressure: 22 bar
  • Max. temperature: 216°C (saturated steam @ 22 bar)


Note:
For saturated steam values > 20 bar, a low-maintenance transparent level gauge with mica shield protection should be used (see graph "glass loss caused by boiler water" for the estimated glass life).
Not only does the glass life depend on the temperature, it depends on the pH of the water (the higher the value, the shorter the glass life).


The product is NOT suitable for use in the following instances:

  • if exposed to corrosive fluid (e.g. caustic soda, hydrofluoric acid, citric acid...)
  • if exposed to high pressure steam
  • if subjected to repeated thermal shocks


In the scenarios listed above, the glass must be protected with MICA or PCTFE shields, so a transparent level gauge is necessary

  • for checking the level of separation between two immiscible fluids (interface)
  • for checking the colour of a fluid (all fluids look very dark)
  • in cases where the fluid is particularly viscous (a film may form on the glass which prevents you from taking an accurate reading)
  • in cases where the fluid is particularly dark (the reflex principle is rendered ineffective)


Download data sheet - PDF

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