The indicator may be a disk that undergoes a chemical reaction to change color or a float that flips over to reveal a side having a different color.
该指示器可以是经历化学反应以改变颜色的盘或者是翻转以显示具有不同颜色的侧面的浮标。
2
The structure, principle and performance of the magnetic transfer type of float ball liquid level indicator as well as its application in VPI are introduced in this paper.