In: Electrical Engineering
Give a brief description of the diaphragm box, how it works and its common types.
It is used to measure the level of the open tank. The box is having a large amount of air, which is kept within a flexible diaphragm. A capillary tube connects the diaphragm box to a pressure gauge.d
The diaphragm box consists of 2 flanges in the middle of which is contained a rubber diaphragm element . The box is immersed in the liquid to be measured and filled with air capillary extends from it to the sensor .
The displacement of the diaphragm caused by the head of the liquid causes a compression of the air in the connection capillary. The pressure due to the liquid against the air within the box denotes fluid pressure at that level.
****Types : 1)open 2) closed.
The open diaphragm box is immersed in the fluid within the vessel. The closed diaphragm box is mounted externally from the vessel and is connected by a short length of piping.
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