Patent ID: 7807041

Claim:
A method for detecting the presence or absence of a gas bubble in an aqueous liquid, compromising: providing an amperometric sensor positioned within a measuring chamber, wherein said amperometric sensor is configured to determine the concentration of a gaseous component dissolved in said liquid, said amperometric sensor comprising a sensitive region; positioning said liquid in said measuring chamber; using said amperometric sensor to take at least one first measurement value of said gaseous component from a first portion of said liquid after a predetermined response time, said first portion located in said sensitive region of said sensor; moving said liquid along in said measuring chamber without significant pressure change in said liquid, such that a second portion of said liquid within said measuring chamber, which had previously been located outside said sensitive region of said amperometric sensor, is positioned in said sensitive region; using said amperometric sensor to take at least one second measurement value of said gaseous component from said second portion of said liquid; and detecting the presence or absence of a gas bubble by comparing said first and second measured values, wherein said liquid is free of bubbles in said sensitive region of said amperometric sensor, if said second measured value is higher by a predetermined amount than said first measured value.