英语翻译
用软件翻译出来的太生硬,没法看,自己又看不懂
Floats are independent of the static pressure and are either of the buoyant or the displacement type.The former is less dense than the liquid in which it is partially immersed and the latter is slightly denser than the liquid.Consequently the buoyant or moving float has a constant immersion and will rise and fall precisely the same distance as the liquid level.Its position at any instant is measured.The displacement or static type has a variable immersion and a variable upthrust upon it.The level is measured in this case in terms of the net -weight of the float.
The capacitance method is generally employed with large cylindrical storage tanks.One electrode is inserted down the centre of the tank whilst the outer wall is used as the other.The tank then acts as a concentric cylindrical capacitor having a capacitance which alters with liquid level.The capacitance (and hence the liquid level) is measured using a stabilised capacitance bridge.