Measuring and testing – With fluid pressure – Leakage
Patent
1990-08-09
1992-03-17
Williams, Hezron E.
Measuring and testing
With fluid pressure
Leakage
73302, G01M 332
Patent
active
050957392
ABSTRACT:
A tank leak detector has a pressure transmitter suspended in a tank to detect liquid level changes of a fluid by sensing a pressure which changes when a liquid level changes. The transmitter preferably is a differential pressure transmitter. A pump is provided for drawing liquid through a tube up to a sealed passageway in a manifold which is connected to a pressure sensing inlet of the pressure transmitter. The pump eliminates air bubbles in the passageway and at the pressure sensing inlet. The sealed passageway provides a liquid column that changes in pressure at the pressure sensing inlet as the liquid level rises and falls where transmitter output indicates liquid level changes. The detector is temperature stable because the tank is underground where both inlets of a pressure sensor are at the same temperature. The unit is easily installed in existing tanks by suspending from a support in the tank.
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Rosemount Inc.
Roskos Joseph W.
Williams Hezron E.
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