3B Scientific U-Tube Manometer S - Manual

3B SCIENTIFIC ® PHYSICS
1
U-Tube Manometer U8410450
Instruction Sheet
08/08 ALF
1 Overflow reservoir
2 Supporting plate
3 Glass tube
4 Tubing connection
5 Rubber bung
1. Safety instructions
There is a risk of injury if the U-tube manometer gets
broken.
• Do not put any mechanical stress on glass body.
2. Description
The U-tube manometer is a simple form of pressure-
measuring instrument, and is used for measuring
small pressures or pressure-differences in the region
of 0 to 10 hPa (0 to 10 cm water column).
It consists of a U-tube open at both ends with an
overflow reservoir at one end, mounted on an alu-
minium supporting plate marked with a scale. On the
back of the supporting plate there is a fixing rod for
clamping the instrument to a stand.
To connect up the manometer in an experiment set-
up it is recommended that 6 mm silicone tubing be
used (U10146). The Indigo solution (U8410620) makes
a suitable dye for colouring the water.
3. Technical Data
Length of arms: 200 mm
Stand rod: 33 mm x 10 mm dia.
Base plate: 210x70 mm 2 approx.
Hose nipple: 9 mm dia. approx.
Weight: 80 g approx.
4. Operating principle
Pressure p is defined as the quotient of the force F
acting at right angles to a plane and the area A of
that plane.
A
F
p
=
1
The units for this are N/m², also named pascals (Pa).
Pressure is also measured in bars (bar), torrs (Torr),
physical atmospheres (atm), technical atmospheres
(at) and millimetres of mercury (mmHg).