TRANSPARENT LEVEL GUAGE

TRANSPARENT LEVEL GUAGE

 WORKING PRINCIPLE 

Apart from glass tube level gauges, transparent level gauges are always fitted with two plate transparentglasses between which the fluid is contained. The fluid level is indicated as the result of the differenttransparency of the two media and in some cases (for water steam), by conveying upwards on to the surfaceof 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.

 APPLICATIONS 

Transparent level gauges are suitable for almost all installations. n 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.