Fluke RUSKA 2470 - Manual (Page 13)

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
PR E S S UR E IN
glg01.eps
Figure 2-1. Simple Cylinder
B
PR E S S UR E IN
glg44.eps
Figure 2-2. Re-Entrant Cylinder