A sensor for measuring a concentration of an analysis fluid based on a thermal conductivity principle. The sensor includes at least one analysis heating element, situated on a measuring diaphragm, for heating the analysis fluid, and a reference heating element, situated on a reference diaphragm, for heating at least one reference gas. The measuring diaphragm and the reference diaphragm are adjacently situated between a sensor substrate and a cap substrate. The measuring diaphragm is situated in a measuring volume and the reference diaphragm is situated in a reference volume. The measuring diaphragm and the reference diaphragm each include at least one coating. The measuring diaphragm is opened by at least one clearance. A method for manufacturing a sensor is also described.

A thermal conductivity detector (1) includes: a cell block (2) provided therein with a measurement cell (10) serving as a space in which a filament (12) for exchanging heat with a gas is arranged, the cell block (2) being provided with a cell inlet (11) for introducing a gas into the measurement cell (10) and a cell outlet (13) for flowing out the gas from the measurement cell (10); an outlet flow path (4) communicated with the cell outlet (13) of the cell block (2); a buffer block (6) provided therein with a buffer space (14), the buffer block (6) having an inlet port (15) for introducing the gas into the buffer space (14) and a discharge port (16) for discharging the gas from the buffer space (14), the inlet port (15) being fluidly connected to the outlet flow path (4); and a discharge member (8) retaining a fluid resistance portion (20) for increasing fluid resistance of the discharge port (16), the discharge member (8) being attached to the buffer block (6) such that the gas discharged from the discharge port (16) passes through the fluid resistance portion (20), the discharge member (8) being configured to be detachable from the buffer block (6) together with the fluid resistance portion (20).

A temperature sensor comprises a temperature sensing element, a protective housing, and a heat transfer element. The temperature sensing element transduces a sensed temperature into an electrical output signal. The protective housing at least partly encases the temperature sensing element. The heat transfer element has an outer surface in heat conductive contact with an inner wall of the protective housing and receives at least a part of the temperature sensing element. The heat transfer element is formed separately from the temperature sensing element.

A temperature sensor comprises a temperature sensing element, a protective housing, and a heat transfer element. The temperature sensing element transduces a sensed temperature into an electrical output signal. The protective housing at least partly encases the temperature sensing element. The heat transfer element has an outer surface in heat conductive contact with an inner wall of the protective housing and receives at least a part of the temperature sensing element. The heat transfer element is formed separately from the temperature sensing element.

Provided is a reducing gas detection sensor which has sensitivity improved as compared to that of the related art, and in which power consumption is decreased. The reducing gas detection sensor includes: a reducing gas detection material including a palladium compound and a carbon compound, and having reactivity with a reducing gas; and a unit configured to measure a conductivity of the reducing gas detection material.

Provided is a reducing gas detection sensor which has sensitivity improved as compared to that of the related art, and in which power consumption is decreased. The reducing gas detection sensor includes: a reducing gas detection material including a palladium compound and a carbon compound, and having reactivity with a reducing gas; and a unit configured to measure a conductivity of the reducing gas detection material.

A thermal conductivity sensing device (1) is disclosed, along with a method for operation of the thermal conductivity sensing device and use of the thermal conductivity sensing device in a system for gas chromatography and a method of carrying out gas chromatography. The thermal conductivity sensing device is for use in sensing one or more gaseous components in a flowing gaseous environment. The device has a first sensor (4B) and a second sensor (4A) for exposure to the same flowing gaseous environment (G). The first sensor has an associated flow altering means (20) to affect gas flow at least at part of the surface of the first sensor, to be different to gas flow at the surface of the second sensor. Each sensor provides an output relating to heat transfer between a surface of the sensor and the gaseous environment. The device is operable to compare outputs of the first and second sensors. The sensor is able to reduce the effects of bulk convection of the flowing gas on thermal conductivity measurements.

A thermal conductivity sensing device (1) is disclosed, along with a method for operation of the thermal conductivity sensing device and use of the thermal conductivity sensing device in a system for gas chromatography and a method of carrying out gas chromatography. The thermal conductivity sensing device is for use in sensing one or more gaseous components in a flowing gaseous environment. The device has a first sensor (4B) and a second sensor (4A) for exposure to the same flowing gaseous environment (G). The first sensor has an associated flow altering means (20) to affect gas flow at least at part of the surface of the first sensor, to be different to gas flow at the surface of the second sensor. Each sensor provides an output relating to heat transfer between a surface of the sensor and the gaseous environment. The device is operable to compare outputs of the first and second sensors. The sensor is able to reduce the effects of bulk convection of the flowing gas on thermal conductivity measurements.

A gas sensor includes a plurality of sensing resistors that vary in resistance based on ambient temperature and the presence of certain gases, such as CO.sub.2 and H.sub.2O. The responses of each of the sensing resistors vary based on a base temperature of each of the sensing resistors. The base temperatures for each of the sensing resistors and configurations of the sensing resistors are selected to emphasize a response to a gas of interest (e.g., CO.sub.2) while de-emphasizing or canceling contributions from ambient temperature and gases that are not of interest (e.g., H.sub.2O).

A gas sensor includes a plurality of sensing resistors that vary in resistance based on ambient temperature and the presence of certain gases, such as CO.sub.2 and H.sub.2O. The responses of each of the sensing resistors vary based on a base temperature of each of the sensing resistors. The base temperatures for each of the sensing resistors and configurations of the sensing resistors are selected to emphasize a response to a gas of interest (e.g., CO.sub.2) while de-emphasizing or canceling contributions from ambient temperature and gases that are not of interest (e.g., H.sub.2O).