Liquid level sensing device

Details Liquid level sensing device Liquid level sensing device

1991-06-25

1992-09-29

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

Float

73313, 335219, H01H 502, G01F 2336

Patent

active

051506149

ABSTRACT:
The invention is directed to a liquid level sensing device having a float (4) configured as a hollow body and slidably mounted on a slide tube (3) for the actuation of reed-type switches (11) provided in the interior of the slide tube (3). In order to perform a check for proper functioning, the float (4) is movable independently of the filling level into a signalling position by an electromagnetic actuation device (15). The hollow space (7) of the float (4) contains a gas pressurized to above or below atmospheric and is connected via a flexible tube (12) to a pressure monitoring device (13) which responds whenever the gas pressure deviates from a predetermined value.

REFERENCES:
patent: 3153932 (1964-10-01), Johnson et al.
patent: 3823328 (1974-07-01), Barton et al.
patent: 4321590 (1982-03-01), Ishikawa et al.
patent: 4442405 (1984-04-01), Andrejasich et al.
patent: 4821022 (1989-04-01), Jannotta
patent: 5035512 (1991-07-01), Tateishi et al.

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