Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-04-09
1981-04-21
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
73304R, 340527, 122504, 1225042, G08B 2100
Patent
active
042635870
ABSTRACT:
A system for monitoring the liquid level in containers such as boilers and tanks. An electrode inserted into the container completes a path through the liquid when the liquid is at or above a predetermined level. When the liquid falls below the level, the path is opened. If the open path persists uninterruptedly for a timed period, an output device such as a relay is energized (or deenergized, if desired) to signal the low fluid level. The circuit path is powered at a low AC level from an AC source which also powers the output device. The low level AC in the circuit path to the liquid minimizes electrolytic and other problems within the container. The low level AC periodically resets a timing device within a direct current monitoring circuit before the expiration of the timed period, as long as the circuit path through the liquid remains closed. The output device is an optical coupling device isolating the output device from the timing device and from the low level AC path.
REFERENCES:
patent: 2385161 (1945-09-01), Pinkerton
patent: 3588892 (1971-06-01), Scheidweiler
patent: 3978464 (1976-08-01), Miesterfeld
patent: 4087706 (1978-05-01), Koester, Jr.
patent: 4149162 (1979-04-01), Enemark et al.
Caldwell Sr. John W.
Chaban Marvin M.
International Telephone and Telegraph Corporation
Myer Daniel
Raden James B.
LandOfFree
Liquid level control system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Liquid level control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid level control system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-560340