Importance

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Abstract

A pressure gage for indicating pressure and variations thereof of a physical variable being monitored. The gage is provided with a circular dial having on the face thereof a pheripheral marginal portion or border green in color and graduations disposed internally of the green peripheral border. A pair of movable arcuate opaque cover plates, each made as an arc of an annulus, are disposed coaxial with the dial and graduations on the face of the dial. The plates are movably mounted for positioning thereof selectively in a circumferential direction of the dial for partially covering the marginal peripheral portion or border of the face of the dial. The plates are positionable selectively so that two opposed ends thereof define a space therebetween so that a green area of the border, which defines a range of selected pressure graduations on the dial, corresponds therewith. These two ends are colored red so that different ranges of pressure graduations may be selected to establish a range of normal values of pressures at which pressures the physical variable are in correspondence with a green normal zone or area of the dial. The graduations outside of the selected range remain visible and the pointer, also continuously visible, points to the instantaneous pressure value which may be in correspondence with the green area or the red areas designated by the plates.

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First Claim