I have got differential pressure from an inclined manometer to be 2.8kPa and density of the fluid is 784kg/m^3. I need to calculate the manometer datum height. how do i do tht?? thnx for the help in advance.

3 answers

There is an article about inclined manometer datum height at
http://books.google.com/books?id=zLwtngK3T1UC&pg=PA52&lpg=PA52&dq=manometer+datum+height&source=bl&ots=Ue8TuGDwNQ&sig=3cx6cTfh0dM9ke9UWC7uxW6OHrY&hl=en&ei=FywBTJePA4HGlQeGoK3yCQ&sa=X&oi=book_result&ct=result&resnum=6&ved=0CCUQ6AEwBQ#v=onepage&q=manometer%20datum%20height&f=false

It seems you need an area ratio for the two colums of fluid that the manometer uses. read the article and see how you can use it to predict datum height d.
Look for Figs 3.3 and 3.4 on page 53 of the reference cited above. The area ratio is only needed on the Fig. 3.3 version.

It seems to me they are asking the problem backwards: you already know the pressure difference and are asked to solve for some column height difference.
yes i used the ame formula but didn't get the correct ans. cn u help me solve it. i want ans to be 6.5 inch (0.165 meters).