Fluid detecting

Details Fluid detecting Fluid detecting

1989-03-27

1990-09-25

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340605, 340619, 116227, G08B 2100

Patent

active

049596390

ABSTRACT:
A flexible rod-and sleeve assembly with rod and surrounding sleeve affixed to each other at their bottom ends is maintained by a spring to put the sleeve in tension. The assembly is inserted into a cavity such as a monitoring well so as to extend below the lowest level which the water table may assume. The sleeve is made of a material which is attacked by petroleum products but not by water, and when a layer of petroleum liquid such as gasoline collects on the surface of the water in contact with some region of the sleeve, the sleeve material loses its strength and ruptures. This results in an upward movement of the sleeve, which is used to actuate alarm and signaling mechanisms.

REFERENCES:
patent: 4351642 (1982-09-01), Bonavent et al.
patent: 4596980 (1986-06-01), Bergeron et al.
patent: 4765178 (1988-08-01), Kempf et al.
Toltech, Hydrocarbon Leak and Spill Monitors (Prior to '88).

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