Metering and control system
US4378523A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1980 |
| Grant date | Mar 29, 1983 |
| Priority date | — |
| Expiry date | Oct 2, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A metering and control system is provided which in one embodiment provides a continuous reading vacuum gage and a controller for activating relays when the vacuum pressures indicated by the gage pass through one or more set points. The controller comprises solid state electrical control circuitry which is separate from the meter, and which may be switched into the meter circuit for calibration purposes. The control circuitry is made up of individual circuits which may be individually adjusted to selected set points, as indicated on the meter. For this purpose, the meter is selectively switched to the various individual circuits. Then, the meter is switched back to indicate the vacuum pressures encountered in the particular system in which it is installed. As the vacuum pressures pass the various set points, the corresponding relays are activated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.