Liquid level sensor

Details Liquid level sensor Liquid level sensor

1981-10-13

1983-12-27

Swisher, S. Clement

Measuring and testing

Liquid level or depth gauge

Float

73321, 73DIG5, 335206, 335207, G01F 2312

Patent

active

044223285

ABSTRACT:
The device senses the level of a float which may rest on the surface of the liquid whose level is to be determined or may rest on the surface of liquid (e.g., mercury) of a manometer which measures the level of liquid in accordance with the purge bubble principle. The fluctuation of the float turns a pulley which causes oscillatory movement of an arm carrying a magnet. In proximity to the path of the magnet is a board carrying radially disposed, angularly spaced reed switches. As the magnet passes each switch it closes same and passes a signal to a digital accumulator. A slip clutch between the arm and a second arm causes the latter to oscillate in the same direction as the first arm, but only for a limited distance. The second arm also carries a magnet which changes the direction of a second reed switch and dampens hunting of the first series of switches by preventing activation of the accumulator except when the second reed switch is closed.

REFERENCES:
patent: 2627178 (1953-02-01), Hayward et al.
patent: 3148542 (1964-09-01), Clift, Jr.
patent: 3441691 (1969-04-01), Newman et al.
patent: 3463491 (1969-08-01), Shaw
patent: 3729667 (1973-04-01), Taylor
patent: 3835335 (1974-09-01), Robischon
patent: 3935741 (1976-02-01), Zinsmeyer et al.
patent: 4061901 (1977-12-01), Saunders et al.

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