- i. A transparent tube on the outside of a reservoir or tank that shows the level of the fluid in the container.ii. A small window in the high side of a vapor-cycle cooling system. The system is fully charged if there are no bubbles seen in the sight glass.Liquid refrigerant flows past the sight glass. If the charge of refrigerant is low, bubbles will be seen. A fully charged system has no bubbles.iii. The transparent glass of a gun sight or a head-up display.A gunsight.
Aviation dictionary. 2014.
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Sight glass — A sight glass or water gauge is a transparent tube through which the operator of a tank or boiler can observe the level of liquid contained within. Liquid in tanksSimple sight glasses may be just a plastic or glass tube connected to the bottom of … Wikipedia
sight glass — A viewing glass or window set in the refrigerant pipe of a car s air conditioning system, usually in the top of the receiver drier, which allows a visual check of the refrigerant passing from the receiver to the evaporator. The fluid should be… … Dictionary of automotive terms
sight glass — noun water gauge … Wiktionary
sight glass — noun a transparent tube or window through which the level of liquid in a reservoir or supply line can be checked visually … English new terms dictionary
sight glass — noun : a transparent section in a pipe or tank wall for giving visual indication of level or flow of liquids * * * n. a transparent tube or window through which the level of liquid in a reservoir or supply line can be checked visually … Useful english dictionary
electronic sight glass — Device that sends an audible signal when system is low in refrigerant … Dictionary of automotive terms
sight — n. & v. n. 1 a the faculty of seeing with the eyes (lost his sight). b the act or an instance of seeing; the state of being seen. 2 a thing seen; a display, show, or spectacle (not a pretty sight; a beautiful sight). 3 a way of looking at or… … Useful english dictionary
glass —  A transparent, hard, amorphous, brittle substance which is made by fusing together one or more of the oxides of silicon, boron, or phosphorus, with certain basic oxides (e.g., sodium, magnesium, calcium, potassium), and cooling the product… … Dictionary of automotive terms
sight — i. An optical device for the measurement of drift. See drift indicator. ii. An aiming device for aiming weapons. It may be a part of a head up display or a separate unit. It may be fixed, gyro, or electronic. See sight glass (iii). iii. To make… … Aviation dictionary
Sight (device) — Sights redirects here. For the rock band, see The Sights .A sight is an optical device used to assist aim by guiding the eye and aligning it with a weapon or other item to be pointed. Various forms of sights exist, such as iron sights, red dot… … Wikipedia