Design And Function; Functional Description - WIKA LGG Betriebsanleitung

2. Design and function

2. Design and function

2.1 Functional description

The sight glass level indicators 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 sight glass level indicator
The body is the basic unit of the
sight glass level indicator 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, sight glass level indicator, model LGG
Cover
U-bolt
Nut
Viewing direction Viewing direction
Gaseous phase
Body
Flat gasket
Glass
Cushion
Liquid phase
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EN