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A ledoux bell manometer uses a shaped "bell" suspended in Mercury to mechanically extact a linear output from a square root flow signal. Seldom used any longer they were popular when pneumatic flowmeters were the standard. Often used on boiler control the advantage of a linear flow signal was that the material balance between drum level, gas flow and steam flow was easy to calculate using linear signals. The shape of the "ledeoux" bell was critical to the accuracy of extracting the square root.

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Why an inverted YouTube manometer more sensitive than upright manometer?

Inverted U-tube manometer is used for measuring pressure differences in liquids. The space above the liquid in the manometer is filled with air which can be admitted or expelled through the tap on the top, in order to adjust the level of the liquid in the manometer. Equating the pressure at the level XX'(pressure at the same level in a continuous body of static fluid is equal), For the left hand side: Px = P1 - rg(h+a) For the right hand side: Px' = P2 - (rga + rmgh) Since Px = Px' P1 - rg(h+a) = P2 - (rga + rmgh) P1 - P2 = (r - rm)gh If the manometric fluid is choosen in such a way that rm << r then, P1 - P2 = rgh. For inverted U - tube manometer the manometric fluid is usually air.


What are the Advantages and disadvantages of using a manometer?

ADVANTAGESFollowing are the advantages of Bourdon tubes :i) low costii) simple constructioniii) time tested in applicationsiv) availability in a wide variety of ranges , including very high rangesv) adaptability to transducer designs for electronic instrumentsvi) high accuracy, especially in relation to costDisadvantages of Manometersi) large and bulkyii) need for levelingiii) lack of portabilityiv) measured fluid must be compatible with manometer fluidv) no over-range protectionvi) condensation may present problems


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