What is the measurement principle of a two-chamber equilibrium vessel?
Thread Content
I can’t understand those schematic diagrams I found online either... Why is the end used for measuring the liquid phase turned into a negative pressure tube? I ask kind people to resolve the doubts in my mind.
1. It is designed this way because it has a small size and high pressure resistance. 2. Why use an inner sleeve in the tube? To keep the temperature as consistent as possible and maintain a high temperature. Moreover, the liquid phase is easier to achieve in the inner tube. 3. If you don’t want to buy a two-chamber balanced container, you can set up your own piping for measurement; I’ve done this before. The prerequisite is that the liquid-phase pipe must remain full. Anyway, you don’t need a two-chamber balance vessel; if something goes wrong, you need to be able to explain it clearly. 4. Under normal conditions, the liquid phase maintains a constant liquid level height in the tube, causing the transmitter to shift. For example, when the liquid level is 0, -100 corresponds to 4 mA (taking this as a reference). As water fills the positive pressure chamber gradually, the differential pressure of the transmitter changes from -100 to 0; 0 then corresponds to 20 mA.
This post was last edited by jizhenlin on 2017-3-21 at 14:41. Borrowing someone else’s work to offer it as a contribution – this paper is written in great detail