| 摘要 |
<p>A gas sensor including a housing containing at least a sensing electrode (22), a counter electrode (44, 44A), a test electrode (24), and electrolyte means in contact with such electrodes (22, 24, 44, 44A). The housing permit is gas from the environment to flow to the sensing electrode (22). The gas sensor is operable either in a normal mode of operation in which potentials are applied to the electrodes (22, 44) for detecting when a gas to be sensed is present at the sensing electrode (22), or in a test mode of operation in which potentials are applied to the electrodes (22, 44, 44A, 24) so that the test electrode (24) generates a gas which flows to the sensing electrode (22) to enable an indication whether the sensor is operating correctly.</p> |
