Design And Function - WIKA LGG serie Betriebsanleitung

2. Design and function

2. Design and function
2.1 Functional description
The glass level gauges operate in accordance with the principle of
communicating vessels. Through the built-in sight glasses, the filling level
of the liquid is directly visible.
2.2 Construction of the glass level gauge
The body is the basic unit of the
glass level gauge and contains
the liquid channel. The sight glass
is secured to the cover via a flat
gasket and cushion using a screw
connection. Valve heads (see
chapter 2.4) serve as shut-off
devices and connect the body with
the vessel.
2.3 Operating principle of the sight glass versions
LGG-R
Reflex glasses per DIN 8081
In the viewing direction, incident
light strikes the reflective grooves
of the sight glass plate and are
refracted into the liquid present.
With gases, the light is reflected.
Thus the filling level is visible as a
darker column, the gaseous area
as a silvery column over it.
Operating instructions glass level gauge, model LGG
Cover
U-bolt
Nut
Viewing direction Viewing direction
Gaseous phase
Body
Flat gasket
Glass
Cushion
Liquid phase
EN
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