Patent ID: 7208071
Filing Date: 2007-04-24
Classification: G01N

Abstract:
1. A sensor for sensing presence of a gas in a liquid, comprising: a sensor housing with an open end and a chamber; an anode and a cathode mounted in the sensor housing, the anode and cathode connecting to a potential V to generate a sensor output current; a membrane covering the open end, the membrane having a first side facing the cathode and a second side in contact with the liquid; chamber electrolyte contacting the anode in the chamber; a channel between the cathode and the chamber electrolyte, the channel having inner and outer channel walls, the channel having a length L and a cross sectional area A; channel electrolyte standing in the channel between the cathode and the chamber electrolyte; the channel electrolyte controlling a background sensor current level I wherein the channel has an area to length A/L ratio less than 0.026 mm so that the channel resistance is high enough to control the background sensor current level I