CAIRE COMPANION 1000 Technical Manual

Contents

CAIRE COMPANION 1000 Technical Manual Manual pdf 33 page image

B-701964-00 Rev. C Theory of Operation 2-5Companion 1000/T Liquid Oxygen System Technical Manual2.1.7 Contents Indicator ScaleThe contents indicator scale (Figure 2-8) is a mechanical, spring-balanced helix devicethat measures the liquid contents in the unit. The needle on the weight scale moves anamount proportional to the amount of liquid in the unit. Suspending the unit from theend of the carrying strap closest to the indicator activates the weight scale mechanism.The contents indicators for the Companion 1000 and Companion T, although similar indesign, are different due to the different empty weight of each unit.Figure 2-8: Contents Indicator Scale2.2 LIQUID OXYGEN SATURATION PRINCIPLESA saturated liquid is one that absorbs the maximum amount of heat possible at a givenpressure without vaporizing into a gas. As additional heat is added, the saturated liquidbegins to vaporize (boil) while remaining at a constant temperature until all of the liquidis vaporized. A common example of a saturated liquid is water at its boiling point of212°F (100°C); additional heat does not cause the water to become hotter, but insteadcauses part of the liquid to turn to water vapor.The saturation point of a liquid depends on temperature and pressure (Figure 2-9). Ifthe pressure in a container of saturated liquid increases, the temperature required forsaturation will also increase, leaving the liquid unsaturated, that is, capable of acceptingmore heat before it will boil. If the pressure in a container of saturated liquid decreases,the temperature required for saturation will decrease, leaving the liquid "supersaturated" or too warm. When this occurs, rapid boiling and vaporizing of some of theliquid occurs. This process continues until the remaining liquid cools down to the newsaturation temperature associated with the new pressure.