Page 292 - Mechanical Engineer's Data Handbook

280 MECHANICAL ENGINEER’S DATA HANDBOOK

U-tube manometer - pressure relative to Pa
atmosphere (gauge pressure)

Let:
pm =density of manometer fluid
h =manometer reading
g =acceleration due to gravity

Measured pressure p = p,gh

Inclined single-leg manometer

Measured pressure p = pmgL sin 0

jPa

U-tube manometer - diferential pressure

Pressure difference p1 -pz = (pm-pf)gh
Inverted U-tube manometer
where: p,=density of measured fluid.
Pressure difference (pl -p2)= (pf -p,)gh

-7

I

Single-leg manometer - gauge pressure
Measured pressure p = p,gh