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Valves:
forged and cast high pressure valves: control, stop, check, blow down, globe, gate, ball,
piston, bellows sealed, instrument
Level gauges: magnetic level gauges, glass level gauges: transparent, reflex, bicolor
Cesare Bonetti - BONT - CMI Pasquini |
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Visitor number
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Last Update
04-02-2009 |
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TRANSPARENT GLASS LEVEL
GAUGES
 Left drawing
shows a typical Transparent Glass Level Gauge.
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.
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.
A variation of transparent level gauges, however equipped with a special back illuminator,
as described in Bicolor level Gauges, gives a sharp reading made
by contrast between bright colors: green in lower part (liquid) and red in upper part
(steam) of visible window. This kind of indicator is suitable for water/steam.
WORKING PRINCIPLE
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Fluid level indication is the result of the
different transparency property of the two media (i.e. liquid and air or vapor). |
| 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. |
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APPLICATIONS:
Transparent level gauges are suitable for all application. 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 color.
PRODUCT RANGE
Our standard range of transparent level gauges covers from PN 16 up to PN 420/
ASME 150 up
to 2500, and can be manufactured, depending on model & type, in different
materials, as ASTM A105, ASTM A350 LF2, ASTM A182 F304 / F316, Monel, Hastelloy, Incoloy,
Carpenter, Nickel, Titanium, Zirconium, Tantalum, Ebonite, PVC, Polypropropilene, PTFE
etc.
Apply to us for other materials.
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Catalogue
[ Transparent Glass Level Gauges ] [ Reflex Glass Level Gauges ] [ Bicolor Glass Level Gauges ] [ Magnetic Level Gauges ] [ Level Gauge Valves ]
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