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Pirani Pressure Sensor

Failure Analysis of Pirani Pressure Sensor Due to Corrosion

SEM elemental mapping showed corrosion was due to attack along the exposed edges of the gold plated sensor by bromine gas. This oxidizing gas formed corrosive hyperbromous acid when it came into contact with atmospheric moisture

Pirani Pressure Sensor Failure Analysis
Pirani Pressure Sensor Failure Analysis

Elemental Map of Bromine

Elemental Map of Bromine

Elemental Map of Oxygen

Elemental Map of Oxygen

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