(GB2323673-A)      An electrochemical sensor comprising: (a) a housing containing: (i) a working electrode; (ii) a counter electrode; (iii) a non-aqueous electrolyte system containing 0-10% water; and (iv) a diffusion barrier which allows a gas phase anolyte to enter the housing while preventing the non-aqueous electrolyte system from flowing out.    USE -   The sensors are useful for detection of saturated and unsaturated hydrocarbons, e.g. methane; chlorine; carbon monoxide; hydrogen sulphide; and hydrogen cyanide.    ADVANTAGE -   The non-aqueous electrolyte sensors do not suffer from the effects of widely varying humidity conditions because they do not gain or lose water to the surrounding environment. Thus, non-aqueous electrolyte systems can be used at extremes of relative humidity. Better sensor performance, having lower zero gas currents and lower intrinsic noise levels than aqueous electrolyte systems, to provide lower detection limits for particular anolyte sensing electro-chemistry. By appropriate choice of non-aqueous electrolyte system, different and/or broader sensor operating temperature ranges can be achieved than is possible with aqueous electrolyte systems. Changes in reaction kinetics can provide improved response times (e.g. of &lt;60 seconds to 80% of final output for sensors of any age) and e.g. linear signals can be obtained over 0.25 ppm chlorine. It was also found that chlorine sensors were insensitive to other chemical species.    (DE19781639-T)      An electrochemical sensor comprising: (a) a housing containing: (i) a working electrode; (ii) a counter electrode; (iii) a non-aqueous electrolyte system containing 0-10% water; and (iv) a diffusion barrier which allows a gas phase anolyte to enter the housing while preventing the non-aqueous electrolyte system from flowing out.    USE -   The sensors are useful for detection of saturated and unsaturated hydrocarbons, e.g. methane; chlorine; carbon monoxide; hydrogen sulphide; and hydrogen cyanide.    ADVANTAGE -   The non-aqueous electrolyte sensors do not suffer from the effects of widely varying humidity conditions because they do not gain or lose water to the surrounding environment. Thus, non-aqueous electrolyte systems can be used at extremes of relative humidity. Better sensor performance, having lower zero gas currents and lower intrinsic noise levels than aqueous electrolyte systems, to provide lower detection limits for particular anolyte sensing electro-chemistry. By appropriate choice of non-aqueous electrolyte system, different and/or broader sensor operating temperature ranges can be achieved than is possible with aqueous electrolyte systems. Changes in reaction kinetics can provide improved response times (e.g. of &lt;60 seconds to 80% of final output for sensors of any age) and e.g. linear signals can be obtained over 0.25 ppm chlorine. It was also found that chlorine sensors were insensitive to other chemical species.    (US5944969-A)      An electrochemical sensor comprising: (a) a housing containing: (i) a working electrode; (ii) a counter electrode; (iii) a non-aqueous electrolyte system containing 0-10% water; and (iv) a diffusion barrier which allows a gas phase anolyte to enter the housing while preventing the non-aqueous electrolyte system from flowing out.    USE -   The sensors are useful for detection of saturated and unsaturated hydrocarbons, e.g. methane; chlorine; carbon monoxide; hydrogen sulphide; and hydrogen cyanide.    ADVANTAGE -   The non-aqueous electrolyte sensors do not suffer from the effects of widely varying humidity conditions because they do not gain or lose water to the surrounding environment. Thus, non-aqueous electrolyte systems can be used at extremes of relative humidity. Better sensor performance, having lower zero gas currents and lower intrinsic noise levels than aqueous electrolyte systems, to provide lower detection limits for particular anolyte sensing electro-chemistry. By appropriate choice of non-aqueous electrolyte system, different and/or broader sensor operating temperature ranges can be achieved than is possible with aqueous electrolyte systems. Changes in reaction kinetics can provide improved response times (e.g. of &lt;60 seconds to 80% of final output for sensors of any age) and e.g. linear signals can be obtained over 0.25 ppm chlorine. It was also found that chlorine sensors were insensitive to other chemical species.    (GB2323673-B)      An electrochemical sensor comprising: (a) a housing containing: (i) a working electrode; (ii) a counter electrode; (iii) a non-aqueous electrolyte system containing 0-10% water; and (iv) a diffusion barrier which allows a gas phase anolyte to enter the housing while preventing the non-aqueous electrolyte system from flowing out.    USE -   The sensors are useful for detection of saturated and unsaturated hydrocarbons, e.g. methane; chlorine; carbon monoxide; hydrogen sulphide; and hydrogen cyanide.    ADVANTAGE -   The non-aqueous electrolyte sensors do not suffer from the effects of widely varying humidity conditions because they do not gain or lose water to the surrounding environment. Thus, non-aqueous electrolyte systems can be used at extremes of relative humidity. Better sensor performance, having lower zero gas currents and lower intrinsic noise levels than aqueous electrolyte systems, to provide lower detection limits for particular anolyte sensing electro-chemistry. By appropriate choice of non-aqueous electrolyte system, different and/or broader sensor operating temperature ranges can be achieved than is possible with aqueous electrolyte systems. Changes in reaction kinetics can provide improved response times (e.g. of &lt;60 seconds to 80% of final output for sensors of any age) and e.g. linear signals can be obtained over 0.25 ppm chlorine. It was also found that chlorine sensors were insensitive to other chemical species.