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2-1
Chapter 2
General Piston Pressure Gauge
Considerations
Types of Piston Pressure Gauges
The piston pressure gauge is sometimes regarded as an absolute instrument because of
the principle by which it measures pressure. An absolute instrument is defined here as
one capable of measuring a quantity in the fundamental units of mass, length, time, etc.
It may be suggested that only certain types of piston pressure gauges qualify in this
category.
Figures 2-1, 2-2, and 2-3 illustrate the three most common types of cylinder arrangements.
A
PRESSURE IN
glg01.eps
Figure 2-1. Simple Cylinder
B
PRESSURE IN
glg44.eps
Figure 2-2. Re-Entrant Cylinder