Measuring the quantity of a gas in a tank
US5410908A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1993 |
| Grant date | May 2, 1995 |
| Priority date | — |
| Expiry date | Dec 20, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF17C2260/026
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensing circuit includes a passive electrical network which has a first electrical property responsive to fluid pressure, and a second electrical property responsive to fluid temperature. A network output is responsive to the first property to a first extent, and to the second property to a second extent. The first and second extents are related in the same manner as a physical property of the fluid (other than its pressure or temperature) relates to its pressure and temperature. The network can include a strain gage that has a gage factor relating the pressure in the fluid to the first electrical property, and a temperature coefficient of gage factor responsive to the fluid temperature. The network can operate according to a gas law and indicate the amount of gas in a tank.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.