Device for remote metering
US4881072A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Mar 9, 1987 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Mar 9, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R22/066
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for remote metering, comprising a meter (4) for measuring a consumption, a transmission circuit for transmitting information relating to quantities consumed, and consisting essentially of a modulating circuit (5,6) and of a bifilar line (3), and a counter circuit for counting sets of information. The modulating circuit comprises a capacitive network (6) and at least one switch (5) which is actuated by the meter and which is capable of modifying the capacity of the capacitive network. The device further comprises a circuit (7,14) suitable for evaluating the value of the capacity of the transmission circuit, and thus for distinguishing two states of the modulating circuit and one state of a fault in the line. Such a device is, in particular, usable for the remote metering of a consumption of gas or of electricity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.