Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1992-12-21
1995-10-31
Peng, John K.
Communications: electrical
Condition responsive indicating system
With particular system function
340584, 374158, 374208, G01K 100
Patent
active
054633753
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to a status-reporting device, a temperature sensor suitable for this purpose, and a process for the production of such a temperature sensor.
Known status-reporting devices of the type indicated above serve to send an alarm signal when an extreme temperature state occurs and simultaneously to indicate which one of the temperature sensors in question triggered the alarm signal (U.S. Pat. No. 4,340,886, EP-A-0 004 911, GB-A-2 174 525, Electronics Weekly No. 778, Aug. 13, 1975, Electronic Design, volume 13, No. 1, Jan. 10, 1985, DE-A-31 28 811). The temperature is monitored e.g. for the purpose of reporting a fire or for monitoring the temperature e.g. of engines, warehouses, furnaces or refrigerating installations. Utilized temperature sensors include thermal members, resistor temperature gauges, temperature-sensitive diodes, mercury switches or the like, as well as e.g. conventional fire alarms or broken-glass detectors, all of which are characterized by relatively slow response times, low sensitivities and large dimensions.
SUMMARY OF THE INVENTION
According to one object of the invention, the status-reporting device designated in the beginning is to be made suitable not only for monitoring temperature, but also for automatically triggering an extinguishing installation as is desired and required e.g. in aircraft, tanks, hazardous material tank trucks or the like because of fires which often erupt in an explosive manner. Therefore, for such applications, not only must temperature sensors be provided which are very small and therefore have very fast responses and can be sampled at high frequencies, but also a process by which such temperature sensors can be produced with such high mechanical and thermal stability that they can also be used in highly sensitive fire detection and fire extinguishing systems in moving vehicles without the risk of mechanical or thermal damage. The invention therefore has the object of proposing a temperature sensor which is particularly suitable for such a status-reporting device and a process for its production.
According to the invention the status-reporting device for reporting a predetermined temperature state comprises a plurality of temperature sensors producing output signals according to a temperature state monitored by the sensors and an evaluating device connected to the sensors and having means for generating and transmitting an alarm signal when a preselected value of the output signals is reached. The evaluating device comprises an interrogating device having an output and a plurality of inputs connected to respective temperature sensors, means for connecting the inputs of the interrogating device with the output of the interrogating device periodically and one after the other and a threshold switch having an output, and means for generating the alarm signal connected to the output of the interrogating device. In this status-reporting device each of the temperature sensors is a bead-heat conductor provided with a tip carrying a semiconductor bead and arranged in a housing. The housing has a hollow end portion and a protective cap connected to the hollow end portion so that the tip is arranged within the cap and the cap is provided with at least one opening for maintaining a flow of air around the tip. The bead-heat conductor in the housing is embedded in a casting compound so that only the tip projects out of the casting compound.
The invention also includes the temperature sensor having the above-described structure.
In a preferred embodiment of the status-reporting device according to the invention the evaluating device further comprises a monoflop for temporarily storing the alarm signal and the output of the threshold switch is connected with the monoflop.
According to the invention the process for making the above-described temperature sensor includes the steps of: housing; to about 80.degree. C.; with a mixture of a sealing compound and a hardener in a mixture weight ratio of said sealing compound to sai
REFERENCES:
patent: 3987899 (1976-10-01), Vyprachticky
patent: 4223302 (1980-09-01), Hocking
patent: 4340886 (1982-07-01), Boldt et al.
patent: 4485263 (1984-11-01), Itoyama et al.
patent: 4929093 (1990-05-01), Suzuki et al.
Electronics Weekly, No. 778, 13 Aug. 1975 (London GB) "Technical Review 2; Product News: Keeping High Standards in system components" p. 22.
Electronic Design, Band 33, No. 1, 10 Jan. 1985, Hasbrouck Heights, N.J., L. Sherman: "Primed by a Processor . . . " pp. 289-296.
Patent abstracts of Japan: Band 9, No. 68 (P-344) [1791] 28 Mar. 1985 & JP, A, 59202038 (TDK K.K.) 15 Nov. 1984.
Dylec Ltd.
Peng John K.
Striker Michael J.
Wu Daniel J.
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