Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-12-02
1993-05-25
Ng, Jin F.
Communications: electrical
Condition responsive indicating system
Specific condition
340605, 324455, 73 2321, 73 405R, G08B 1710
Patent
active
052144127
ABSTRACT:
A leak detector has a dual sensitivity due to two thresholds, a first established by a standard leak of the test gas representing the smallest leak to be detected, and the second as a fraction of the first one. A variable autozero level is used to compensate for background but is limited in its range to prevent masking of the leak by the autozero level. When measured gas concentration in excess of the autozero level exceeds the second threshold, the autozero value is held at a fixed value and an annuciator produces a signal as a function of the concentration so that the maximum concentration and the leak site can be found. When the leak site is found, the operator selects the first threshold for comparison with the gas concentration in excess of the held autozero value to determine whether the leak exceeds the rejection level.
REFERENCES:
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patent: 3786675 (1974-01-01), Delatorre et al.
patent: 4282521 (1981-08-01), Lieberman
patent: 4488118 (1984-12-01), Jeffers et al.
patent: 4797621 (1989-01-01), Anderson et al.
patent: 4879546 (1989-11-01), Dunham et al.
Gavlak Michael A.
Wicke Brian G.
General Motors Corporation
Hofsass Jeffery A.
Ng Jin F.
Phillips Ronald L.
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