Control circuit with an auxiliary process variable
US4447869A · kind A · utility
1Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 2, 1981 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Nov 2, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/20
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The control circuit is provided with a signal transmitter for feeding a temporary disturbance signal to the controller 16, a selector which is selectively connected to the signal transmitter and a function transmitter and a disturbance indicator which switches the selector to the function transmitter in response to a signal from the signal transmitter falling outside a certain preset range of threshold values. The control of the circuit may be constructed in various manners.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.