Portable electro-pneumatic calibrator
First Claim
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1. A multifunction portable calibration unit for testing electrical or pneumatic meters or gauges comprising in combination:
- a housing having a plurality of display devices mounted thereon exteriorally readable by an operator of said calibration unit;
a first pneumatic means for supplying a regulated air pressure from an air pressure source or receiving an unknown pressure, for measuring the regulated pressure or unknown pressure, and for displaying the pressure measurement on a first display device;
a second pneumatic means for supplying a regulated air pressure from said air pressure source, for measuring the regulated pressure, and for displaying the pressure measurement on a second display device and further including means to vent the regulated air pressure in order to supply a known pressure or atmospheric pressure alternately; and
an electrical means for supplying a regulated current or voltage or receiving an unknown current or voltage and displaying the measured current or voltage on a third display device;
said first pneumatic means, said second pneumatic means and said electrical means being housed in said housing and having a common power source.
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Abstract
An electro-pneumatic calibrator to be used in testing and calibration of electro-pneumatic devices having the capability of generating or measuring air pressure in psi, current in milliamps or voltage and measuring air pressure in inches of water or resistance in ohms. A plurality of separate digital meters allow simultaneous use of the separate functions. The apparatus includes a switch and two potentiometers which allows setting variable zero points and spans when the apparatus is used to generate a current or voltage and quickly switching between the set zero point and span.
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Citations
15 Claims
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1. A multifunction portable calibration unit for testing electrical or pneumatic meters or gauges comprising in combination:
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a housing having a plurality of display devices mounted thereon exteriorally readable by an operator of said calibration unit; a first pneumatic means for supplying a regulated air pressure from an air pressure source or receiving an unknown pressure, for measuring the regulated pressure or unknown pressure, and for displaying the pressure measurement on a first display device; a second pneumatic means for supplying a regulated air pressure from said air pressure source, for measuring the regulated pressure, and for displaying the pressure measurement on a second display device and further including means to vent the regulated air pressure in order to supply a known pressure or atmospheric pressure alternately; and an electrical means for supplying a regulated current or voltage or receiving an unknown current or voltage and displaying the measured current or voltage on a third display device; said first pneumatic means, said second pneumatic means and said electrical means being housed in said housing and having a common power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification