Method and apparatus for testing overfill protection devices

G - Physics – 01 – F

Patent

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G01F 25/00 (2006.01) G01F 23/22 (2006.01)

Patent

CA 2125741

The present invention resides in a probe excitation and testing ("PET") system that can apply either a normal excitation or a "small" bias test excitation to overfill protection probes mounted within storage and transport tanks used to store, e.g., flammable fluids. The PET system applies the normal excitation for normal operation of the probes to provide overfill protection, and applies a "small" bias test excitation to the probes for performing diagnostic tests, including anti-cheating. The PET system can also perform a probe signature validation test under normal excitation to ascertain whether the probes are responding thereto in accordance with specifications relating to characteristic parameters of the probes' output waveforms, e.g., duty cycle, magnitude, and period.

La présente invention fait état d'un système d'excitation et d'essai (PET) de sondes. Le système peut effectuer une excitation normale ou un test aux marges de faible excitation sur des sondes pour système d'arrêt volumétrique installées dans des réservoirs de stockage et des citernes de transport des fluides inflammables par exemple. Le système PET procède à un test d'excitation normal pour s'assurer du fonctionnement normal des sondes en matière de protection contre le trop-plein. Il procède à un test d'excitation aux marges quand il s'agit d'essais de diagnostic, y compris de test anti-fraude. Le système PET peut également effectuer un essai de validation de signature de sonde pendant un test d'excitation normal pour déterminer si les sondes réagissent au test selon les spécifications propres aux paramètres caractéristiques des ondes de sortie de la sonde, comme le cycle de travail, la grandeur et la période.

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