Probe for measuring the partial pressure of oxygen in a gaseous atmosphere in relation to a reference atmosphere

摘要

To make it possible to exchange the solid-electrolyte ball (1) easily and quickly, while at the same time ensuring effective sealing between the support (3) and the ball (1), when it has been polluted by the atmosphere of a furnace, the probe comprises a sleeve (4) communicating with the atmosphere of the furnace via orifices (13) and having a stop (5) forming a measuring electrode. The ball is stressed up against the stop (5) by a support (3), while a shoe (12) pressed against the ball (1) by a rod (9) forms an internal electode. This rod (9) has a cavity (15), in which is accommodated a thermocouple (16) for measuring the temperature of the ball (1), and longitudinal ducts for the passage of wires (18, 19, 24) for connection to the thermocouple (16) and the shoe (12) and for conveying reference air into the region of the shoe. The spherical shape of the contact surface between the ball (1) and the support (3) ensures effective sealing.