Test probe for use in a storage tank leak detection system

Details Test probe for use in a storage tank leak detection system Test probe for use in a storage tank leak detection system

G - Physics

01

F

73/39

G01F 23/30 (2006.01) G01M 3/32 (2006.01)

Patent

CA 2036255

TEST PROBE FOR USE IN A STORAGE TANK LEAK DETECTION SYSTEM ABSTRACT OF THE DISCLOSURE A test probe is described for substantially eliminating measuring inaccuracies in a storage tank leak detection system caused by temperature-induced volumetric changes in the stored fluid product. The apparatus comprises an elongated tube, formed of a low temperature coefficient material, supported in the storage tank and having first and second ends and a substantially hollow core. A housing is attached to the second end of the elongated tube and is vented to the fluid product such that a portion of the fluid product enters the housing. An inner tube is located within the elongated tube and has an opening connected to the housing. The inner tube is preferably supported within an outer tube and the inner and outer tubes are separated by an evacuated space to provide thermal isolation of the inner tube from the elongated tube. A low temperature coefficient medium is then supported in the inner tube. According to the invention, a non-reactive liquid seal is supported in the housing between the medium and the fluid product for supporting the medium in the inner tube in static equilibrium with respect to the fluid product. The large disparity between the temperature coefficients of the - 24 - medium and the fluid product insures that temperature-induced volumetric changes in the fluid product do not vary the level of the medium in the tube. - 25 -

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