Combination hazardous liquid and water sensor
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United States of America Patent
Stats
-
Dec 15, 1987
Grant Date -
N/A
app pub date -
Oct 18, 1985
filing date -
Oct 18, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus and method are provided for sensing the presence of product and/or water in the annular space of a double wall storage tank. The apparatus includes both a product sensing element and a water sensing element that are operatively associated with each other to control the compression of a spring. The spring is operatively connected to a colored marker which is able to move from within an opaque tube to within a transparent tube using the force of the spring. When the product sensing element is contacted by product or the water sensing element is contacted by water so that the respective sensor weakens, the spring force is used to move the colored marker so that it is within the transparent tube. In such a position, the colored marker becomes visible, indicating that product and/or water are present in the annular space of the double wall storage tank.
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