Communications: electrical – Systems – Call station
Patent
1974-04-08
1976-01-27
Habecker, Thomas B.
Communications: electrical
Systems
Call station
3403094, 73 405R, G08b 2100
Patent
active
039355675
ABSTRACT:
A system for detecting a leak in a line consists of an apparatus for detecting a drop to a predetermined pressure in the line; and, once the predetermined pressure is reached, an output is developed by the pressure-sensing apparatus. A bi-state circuit responsive to the output from the detecting apparatus has a first state when no leak is present and a second state when the predetermined pressure is detected. A switching circuit has its input connected through the bi-state circuit. A timing circuit develops a signal at its output after a predetermined time and applies this signal to a bi-state gate circuit. A nonleak detector is coupled to the output of the bi-stable gate circuit to indicate that no leak is present in the system. When the bi-state circuit receives an indication from the detector apparatus that the predetermined pressure has been reached, the bi-state circuit prevents the development of the output signal from the timer circuit and operates an indicator means which indicates that a leak has been detected. The leak detection apparatus is reset on a periodic basis.
REFERENCES:
patent: 3016525 (1962-01-01), Hauck
patent: 3261201 (1966-07-01), Pottash
patent: 3753260 (1973-08-01), Nelkin
Habecker Thomas B.
Kotarski Joseph C.
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