What is Sight Glass Level Gauge?

The sight glass consists of a strengthened glass tube, attached to the container as shown in Figure, through which the fluid level in the container can easily be observed by the operator.

Sight Glass Level Gauge

Monitoring the level from a distance, is facilitated when a magnetic float inside the tube, is allowed to rise and fall with the liquid level, causing metallic flags (or louvers) to flip and expose a different colour, indicating the level.

Sight Glass Level Gauge

What is Sight Glass Level Gauge?

These devices are available with continuous monitoring equipment, allowing both a local visible indication as well as an external signal for remote monitoring.

Glass Level Gauges can be divided into the below (most common) 2 types:

  • Reflex Glass Type
  • Transparent Glass Type

REFLEX LEVEL GAUGE:

What is Sight Glass Level Gauge?

Gas or steam phase: Light reflects by the prismatic grooves of the glass, which therefore gives a clear appearance.

Liquid phase: the light is absorbed, thus providing a dark indication of the level.

TRANSPARENT:

What is Sight Glass Level Gauge?

In this type of level gauges, the liquid is contained between two transparent glasses. This permits a through vision of the fluid(s), thus providing a perfect indication of the level.

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