Alicat P Series Pressure Gauge - Manual (Page 31)

31
DIFFERENTIAL PRESSURE GAUGES:
The differential pressure gauge is designed to
measure a pressure ratio between two points in
the line. There are a variety of applications for
this device.
One of the most common is to measure the
difference in pressure across some sort of
element that changes resistance to flow over
time, such as a filter, or one that changes area
with time as would happen with orifice testing.
The gauge has two sensing ports which are piped
to the upstream and downstream sides of the
pressure drop of interest in the system.
These two ports run either to two separate
pressure sensors or for low differential pressures – they may be run to the two
legs of a single differential pressure sensor. The higher (upstream) pressure is
applied to the left port and the lower (downstream) pressure is applied to the
right port.
P1
P2
Differential Pressure Gauge Application