WIKA LGG 可视玻璃液位指示器
Sight glass level
indicator

Applications
■ Heat
transfer and refrigeration systems
■ Plant for cryogenics
■ Steam
boilers
■ Process industries: chemical plants, refineries, offshore, oil
and gas, power plants
Special features
■ Pressure rating PN 6 ...
250
■ Operating temperatures from -200 ... +450 °C
■ Carbon steels
and stainless steels, suitable for pressure vessels in accordance with EN or
ASME
Description
The model LGG sight glass indicator
serves as a direct display for fluids and can be fitted with reflex or
transparrent sight glasses, or with mica. For light-dark contrast, the
refraction principle is used. For pressures under 25 bar, a glass tube display
is used.
The model LGG sight glass indicator consists of a core in a glass
holder, also known as a backplate. Incorporated into this backplate are the
fluid channel (and if necessary the heating channel) and the seating face for
the integral sealing and sightglasses.
The glasses and/or mica discs as well as the seals are fitted,
secured and sealed with the aid of screws and a cover.
Glasses are used
in accordance with DIN 7081, meaning to max. temperatures of 243 °C (280 °C with
mica design) for steam, up to 300 °C for other media, to 450 °C in specia
circumstances.
For the sight glass plates, for glass quality, only borosilicate glass is
used. Outside of these operating conditions the natural material mica is
used.
The connection to the process is generally made with valve heads
with single or double isolation. Drain valves enable the sight glass indicator
to be emptied and are fitted to the lower flange face. If necessary, a vent
valve can be fitted at the top.

The
specifications given in this document represent the state of engineering at the
time of publishing.
We reserve the right to make modifications to the
specifications and materials.
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indicator
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