SM0486
case which converts the pressure to a motion which is translated through suitable
links and levers into proper motion of the pointer across the indicating scale.
Figure 6.
Gages with concentric and eccentric scales
b. Classification of Gages. There are five basic ways by which gages can be
broadly classified. These are by:
A.S.A. standards.
Case type.
General field of use.
Specific end use.
Type of measuring element.
Of these five classifications we will discuss the classifications only by A.S.A.
standards, specific end use, and type of measuring element.
(1) Classification by A.S.A. standards. The American Society of Mechanical
Engineers sponsored and accepted standards for pressure and vacuum gages.
These
standards were prepared by the American Standards Association and are referred to
as the "A.S.A. Standards."
The standards classify gages into three grades of
accuracies to which they are to be
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