Apart from glass tube level gauges, 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 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.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.
Orientation of Process Connection : Tap - Bottom Vertical / Side-Side Right / Side-Side Left
Process Connection : Flange Connection / Screwed Connection
Connection Size : 15 NB to 50 NB
MOC of Liquid Chamber : CS /A 105 / SS 304 / SS 316 / SS 316L
MOC of Cover Plate : CS /A 105 / SS 304/SS 316 / SS 316L
Drain and Vent : ½" NPT / ½" Ball Valve / ½" Needle Valve
Isolation Valves : Screwed Bonnet / Bolted Bonnet with Auto ball check
Gasket : CAF / PTFE / Graphoil
Toughened Glass : Indigenous / Klinger or Maxos Make
Scale : Aluminium / SS / Acrylic
Stud Bolts and Nut : ASTM A 193 Gr. B7 - ASTM A 194 Gr. 2H