Oxygen sensors

摘要

An electrochemical oxygen sensor includes a micro-porous plastic membrane supported on a sealing disk and located between a gas inflow port and the sensor's electrolyte. The membrane and disk minimize thermal shock effects due to using the sensor at a first location, at a first temperature, and then moving it to a second location at a different temperature.

主权项

1. An electrochemical gas sensor comprising:
a housing with an open end; a partition carried on the open end with the partition including at least a rigid support member that carries a selected membrane, the support member is sandwiched between the membrane and the open end of the housing, and the support member is sealed to the open end of the housing with an air tight seal; a cap which carries an electrode, the cap is sealed to the housing adjacent to the open end; and a current collector which extends from within the housing, through the seal between the end of the housing and the support member and into a region between the electrode carried by the cap and the membrane wherein the membrane further comprises liquid held in the pores of the membrane, the pores having a diameter that requires a predetermined minimum pressure to force the liquid out of the pores and before gas is able to cross the membrane, the minimum pressure exceeding that created by environmental temperature changes thereby preventing the bulk transport of gas across the membrane and eliminating temperature transient effect.