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[[File:Glass Level Gauge.jpg|thumb|right|Glass Level Gauges]] | |||
[[File:Glass Level Gauge1.jpg|thumb|right|Glass Level Gauges]] | |||
'''Glass Level Gauges''' can suit most of the applications found in the steam generation as well as in the process industries. | |||
==Types of glass level gauges== | |||
Two main types of glass level gauges are the reflex type and the transparent type. | |||
===Reflex Glass Level Gauges=== | |||
The principle of the reflex glass lies in the reflection of the outer light. In the gas or steam phase, the light is reflected by the prismatic grooves of the glass, which therefore gives a clear appearance. In the liquid phase, the light is absorbed, thus providing a dark indication of the level. | |||
====Features==== | |||
* In the reflex glass level gauge, the liquid level is distinguished by the different brightness of the reflex glass in water or in steam space | |||
* Right-handed or left-handed according to the position of the shut-off valve compared with the gauge body | |||
* Applicable optionals and bolting torque | |||
====Application==== | |||
* Can be used in most of application | |||
* Offer great advantages such as low initial cost, low operating cost, easy level reading | |||
* Cannot be used when the separation level between two liquids has to be read (interface) | |||
* Cannot be used when besides the level indication, the observation of the liquid colour is required | |||
* Cannot be used when the process fluid is high pressure water steam | |||
* Cannot be used when the process fluid can corrode the glass | |||
===Transparent Glass Level Gauges=== | |||
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. They can find their utility in a great number of applications and particularly in the observation of interface or fluid color. Finally, a backlight illuminator can be mounted on their rear side, thereby improving the visibility. | |||
====Features==== | |||
* Transparent glass level gauges are fitted with two plate transparent glasses | |||
* Fluid level is indicated as the result of the different transparency of the two media | |||
* Right-handed or left-handed according to the position of the shut-off valve compared with the gauge body | |||
* Applicable optionals and bolting torque | |||
====Applications==== | |||
* Suitable for almost all installation | |||
They allow: | |||
:* the use of mica or Polytrifluorochloroethylene shields to protect the glass from corrosive action; | |||
:* the observation of interface; | |||
:* the observation of the liquid colour | |||