Apparatus for monitoring disturbances in environmental conditions
US4668939A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1986 |
| Grant date | May 26, 1987 |
| Priority date | — |
| Expiry date | Apr 21, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B26/002
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An improved apparatus for detecting environmental disturbances such as the occurrence of a fire, a gas leak or the like, includes a central processing unit and a plurality of terminal detectors, wherein an identification code is assigned to each of the detectors and the central processing unit sequentially calls the detectors in rotation requesting them to transmit thereto the data collected on smoke concentration, gas concentration, temperature or the like. The apparatus is provided with a display unit and a memory. Data collected by each detector concerning on the environmental condition of the place where each detector is installed are stored in the memory in time series. When a signal for data exceeding a fixed reference level is received, a provisional alarm is raised for the operator and the stored data for a limited period of time in the past are displayed. The operator, upon noticing the alarm, reads the displayed data and judges whether a disturbance, a fire for instance, has occurred basing his judgment on his interpretation of the pattern of the past data in the light of the specific characteristics of said detector and the place where the detector is installed, and, whe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.