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The liquid is contained between the two sight glasses and under normal conditions the level of the liquid is visible as it is through naked eye. An illuminator is provided if required, its light rays are deflected by a louvered screen upwards into the liquid column. Due to the provision of lluminator the light rays which impinge on the surface of the meniscus are reflected back to the eyes of the observer. Due to the above he sees in the gauge the illuminated surface of the liquid. Colored media are easily observed without an
illuminator. |
