(WO9601419-A1)      The sensor has: a) several gas sensitive fields, which are thin, semiconductive, metal oxide films; b) two electrodes connected to each field; c) modified electrical conductivity in each field, achieved by variations in temperature, composition, doping and/or coating, in contact with the reducing or oxidising gases; d) fields forming a continuous surface; e) electrodes laid out in bands; and f) a division of the continuous fields such that each is delimited by two electrodes.    USE -   The sensor detects reducing gases, e.g., H2, CH4, CO, and vapours, e.g. EtOH. It also detects oxidising gases, e.g.: NO2. Analytical determinations of mixtures are achieved. Gases not reacting under the conditions of use, e.g. N2, CO2 and the noble gases, are not detected.    ADVANTAGE -   The construction aims at simple manufacture,using typical microcircuit vapour deposition and doping techniques. It avoids the time consuming and expensive formation of individual sensor regions, with separate piecewise addition of electrodes. Four detailed examples of construction are given for differing sensors. Variations in structure and composition of the fields make it possible to identify, and to quantify, individual components in a mixture of several gases. Numbers of parallel detection areas make possible the omission of connections to any regions found defective, a form of redundancy. It is also possible to vary the sensitivity, by altering the number of connected fields. The sensor should be used at several hundred degrees C., typically 300-400 C, and may have it sown built-in heater for the purpose. A platinum deposit is used as a resistance thermometer if required.    (JP10501068-W)      The sensor has: a) several gas sensitive fields, which are thin, semiconductive, metal oxide films; b) two electrodes connected to each field; c) modified electrical conductivity in each field, achieved by variations in temperature, composition, doping and/or coating, in contact with the reducing or oxidising gases; d) fields forming a continuous surface; e) electrodes laid out in bands; and f) a division of the continuous fields such that each is delimited by two electrodes.    USE -   The sensor detects reducing gases, e.g., H2, CH4, CO, and vapours, e.g. EtOH. It also detects oxidising gases, e.g.: NO2. Analytical determinations of mixtures are achieved. Gases not reacting under the conditions of use, e.g. N2, CO2 and the noble gases, are not detected.    ADVANTAGE -   The construction aims at simple manufacture,using typical microcircuit vapour deposition and doping techniques. It avoids the time consuming and expensive formation of individual sensor regions, with separate piecewise addition of electrodes. Four detailed examples of construction are given for differing sensors. Variations in structure and composition of the fields make it possible to identify, and to quantify, individual components in a mixture of several gases. Numbers of parallel detection areas make possible the omission of connections to any regions found defective, a form of redundancy. It is also possible to vary the sensitivity, by altering the number of connected fields. The sensor should be used at several hundred degrees C., typically 300-400 C, and may have it sown built-in heater for the purpose. A platinum deposit is used as a resistance thermometer if required.    (US5783154-A)      The sensor has: a) several gas sensitive fields, which are thin, semiconductive, metal oxide films; b) two electrodes connected to each field; c) modified electrical conductivity in each field, achieved by variations in temperature, composition, doping and/or coating, in contact with the reducing or oxidising gases; d) fields forming a continuous surface; e) electrodes laid out in bands; and f) a division of the continuous fields such that each is delimited by two electrodes.    USE -   The sensor detects reducing gases, e.g., H2, CH4, CO, and vapours, e.g. EtOH. It also detects oxidising gases, e.g.: NO2. Analytical determinations of mixtures are achieved. Gases not reacting under the conditions of use, e.g. N2, CO2 and the noble gases, are not detected.    ADVANTAGE -   The construction aims at simple manufacture,using typical microcircuit vapour deposition and doping techniques. It avoids the time consuming and expensive formation of individual sensor regions, with separate piecewise addition of electrodes. Four detailed examples of construction are given for differing sensors. Variations in structure and composition of the fields make it possible to identify, and to quantify, individual components in a mixture of several gases. Numbers of parallel detection areas make possible the omission of connections to any regions found defective, a form of redundancy. It is also possible to vary the sensitivity, by altering the number of connected fields. The sensor should be used at several hundred degrees C., typically 300-400 C, and may have it sown built-in heater for the purpose. A platinum deposit is used as a resistance thermometer if required.    (EP769141-B1)      The sensor has: a) several gas sensitive fields, which are thin, semiconductive, metal oxide films; b) two electrodes connected to each field; c) modified electrical conductivity in each field, achieved by variations in temperature, composition, doping and/or coating, in contact with the reducing or oxidising gases; d) fields forming a continuous surface; e) electrodes laid out in bands; and f) a division of the continuous fields such that each is delimited by two electrodes.    USE -   The sensor detects reducing gases, e.g., H2, CH4, CO, and vapours, e.g. EtOH. It also detects oxidising gases, e.g.: NO2. Analytical determinations of mixtures are achieved. Gases not reacting under the conditions of use, e.g. N2, CO2 and the noble gases, are not detected.    ADVANTAGE -   The construction aims at simple manufacture,using typical microcircuit vapour deposition and doping techniques. It avoids the time consuming and expensive formation of individual sensor regions, with separate piecewise addition of electrodes. Four detailed examples of construction are given for differing sensors. Variations in structure and composition of the fields make it possible to identify, and to quantify, individual components in a mixture of several gases. Numbers of parallel detection areas make possible the omission of connections to any regions found defective, a form of redundancy. It is also possible to vary the sensitivity, by altering the number of connected fields. The sensor should be used at several hundred degrees C., typically 300-400 C, and may have it sown built-in heater for the purpose. A platinum deposit is used as a resistance thermometer if required.    (JP2980688-B2)      The sensor has: a) several gas sensitive fields, which are thin, semiconductive, metal oxide films; b) two electrodes connected to each field; c) modified electrical conductivity in each field, achieved by variations in temperature, composition, doping and/or coating, in contact with the reducing or oxidising gases; d) fields forming a continuous surface; e) electrodes laid out in bands; and f) a division of the continuous fields such that each is delimited by two electrodes.    USE -   The sensor detects reducing gases, e.g., H2, CH4, CO, and vapours, e.g. EtOH. It also detects oxidising gases, e.g.: NO2. Analytical determinations of mixtures are achieved. Gases not reacting under the conditions of use, e.g. N2, CO2 and the noble gases, are not detected.    ADVANTAGE -   The construction aims at simple manufacture,using typical microcircuit vapour deposition and doping techniques. It avoids the time consuming and expensive formation of individual sensor regions, with separate piecewise addition of electrodes. Four detailed examples of construction are given for differing sensors. Variations in structure and composition of the fields make it possible to identify, and to quantify, individual components in a mixture of several gases. Numbers of parallel detection areas make possible the omission of connections to any regions found defective, a form of redundancy. It is also possible to vary the sensitivity, by altering the number of connected fields. The sensor should be used at several hundred degrees C., typically 300-400 C, and may have it sown built-in heater for the purpose. A platinum deposit is used as a resistance thermometer if required.