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Apparatus for monitoring disturbances in environmental conditions
| Details |
Inventors: Kimura, Tetsuo; Tanaka, Seiichi;
Assignee: Nittan Company, Limited (Tokyo, JP)
Primary Examiner: Crosland; Donnie L.
Assistant Examiner:
Attorney, Agent or Firm: Abelman Frayne Rezac & Schwab
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, when he judges that a disturbance has occurred, he manually issues a general alarm. |
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DETAILED DESCRIPTION OF EMBODIMENT OF THE INVENTION The apparatus of the embodiment as shown in FIG.
1 comprises central operation unit 11, a transmission control circuit 2 connected to the CPU 1, a transmission line 3 connected to the transmission control circuit 2, and a plurality of detectors D.
sub.
1, D.
sub.
2, D.
sub.
3 .
.
.
D.
sub.
n connected to the transmission line 3.
Each detector comprises a sensor 5 and a terminal unit 4 and usually includes an A/D converter not specifically shown.
An identification code is assigned to each detector.
The central operation unit 11 comprises a commercially available standard microprocessor or CPU (INTEL 8085 for instance) 1, a commercially available RAM (INTEL 2114 for instance) 6, an interface 9 and another interface 10.
The interface 9 comprises a latch circuit, a buffer, etc.
and these are used to compensate difference in treating speed when data are exchanged between the CPU and the peripherals.
A suitable one is INTEL 8255 for instance.
The interface 10 functions in the same way and INTEL 8279 and 8255 were used.
The central operation unit 11 is constructed so that it is operable in accordance with the flow chart in FIG.
2.
That is, in Step 1, a particular detector is called, and in Step 2, data such as smoke concentration is taken in.
In Step 3, the data is stored in the memory.
In Step 4, the data is compared with the reference, and if the data does not exceed the reference, operation proceeds to Step 5, where the next detector identification code is set, and Steps 1-5 are repeated.
If the data exceeds the reference at Step 4, the operation proceeds to Step 6, where it is checked whether the alarming and display as mentioned below were completed or not.
If it was completed, a new detector code is automatically set and operation returned to Step 1.
If it was not completed, the alarm for an operator is generated at Step 7, and the data for the past limited period time is displayed for monitoring, and thus the general alarm is generated or not
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Processing Data 
