Instruction Manual #122162 40
a force in the horizontal plane. With no force of gravity (F
1
) acting in this plane the spring force
(F
kx
) becomes the effective weight of the piston.
6.2.3 Force of Atmospheric Reference
The third force acting on the piston is that of atmosphere (F
ref
) providing a reference pressure to
the top of the piston. Atmospheric pressure acting on the cross sectional area of the piston
provides the reference ambient pressure to which the controlled differential pressure is
maintained.
6.2.4 Force of Process Pressure
Finally, the fourth and balancing force on the piston is a result of the process pressure (F
pp
)
acting on the face of the piston. This force can exert a force in either direction depending on the
relative process pressure being maintained. Positive process pressures will exert a force onto
the face of the piston while negative process pressures will exert a negative or vacuum force
onto the face of the piston. In the horizontal flow configuration, a positive process pressure
exerts an upward force onto the piston while a negative process pressure exerts a downward
force onto the piston. In the vertical flow configuration, the force exerted is in the horizontal
plane.
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