G - Physics – 01 – L
Patent
G - Physics
01
L
73/172
G01L 7/16 (2006.01)
Patent
CA 1079543
ABSTRACT OF THE DISCLOSURE Generally, separate instruments are utilized for measurement of vacuum and pressure. A bourdon type gauge has been utilized in the past, but only one half of the scale is available for obtaining either measurement. The present invention provides a combination vacuum/pressure gauge in which the scale for both pressure or vacuum covers the entire working portion of the dial. Also, the invention provides an instrument casing from which can be constructed either a combination vacuum/pressure gauge or a high pres- sure gauge. According to the invention, a casing construc- tion is provided which can be utilized for the assembly of components of either a combination vacuum/pressure gauge or of a high pressure gauge while utilizing the same dial indicator movement; the combination vacuum/pressure gauge having a vacuum connection at one end of the casing and a pressure connection at the other end and the same complete scale can be utilized for the measurement of either value. For the combination gauge, pistons are attached to opposite ends of a movable shaft and vacuum can be admitted at one end of the shaft and pressure admitted to the other end of the shaft.
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