Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-06-28
1997-12-16
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340608, 340623, 340624, 340539, 137558, 73290R, 73305, 73307, G08B 2100
Patent
active
056990499
ABSTRACT:
Abnormal flow of liquid in a non-pressurized conduit such as a drain line of a building is detected by a liquid level sensor unit connected at a conduit location not anticipated to fill with liquid during normal flow, so that liquid backing up at such location will enter a sensor chamber of the unit to cause a liquid level sensor to signal an indicator. A monitoring system uses at least one such sensor to signal at least one local or remote indicator that indicates which sensor has detected abnormal flow. The system can monitor for short times particular drain lines suspected of experiencing abnormal flow, or can serve on a long-term basis to provide an early warning of clogging and blockage in lines selected for monitoring. Each sensor unit preferably uses a small liquid level sensor connected centrally to a mounting member that defines an annular, circumferentially extending mounting flange that can be releasably clamped in place adjacent an end region of a length of conventional pipe that is used to define the sensor chamber of the unit, to thereby provide a simple and inexpensive, easily installed and easily serviced sensor unit that can optionally house a battery and light to provide a local indication of sensed abnormal flow.
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Burge, Esq. David A.
Hofsass Jeffery
Lieu Julie B.
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