Constant temperature insulation system for thermal conductivity gas detection

Abstract

The invention provides a constant temperature insulation system for thermal conductivity gas detection, comprising a constant temperature unit of a thermal conductivity sensor and a constant temperature unit of a gas guide pipe. The constant temperature unit of the thermal conductivity sensor comprises a gas guide chamber, the thermal conductivity sensor and a heating temperature control system of the gas guide chamber, wherein the thermal conductivity sensor is fixed in the gas guide chamber. The constant temperature unit of the gas guide pipe comprises the gas guide pipe and a heating temperature control system of the gas guide pipe, wherein one end of the gas guide pipe is led into the gas guide chamber. By respectively heating and controlling the temperature the gas guide pipe for conveying gas to be detected and the gas guide chamber where the thermal conductivity sensor is placed, the constant temperature insulation system enables the ambient temperature of the thermal conductivity sensor and the temperature of the gas to be detected in the gas guide pipe to be both slightly higher than the environmental temperature and keep constant. In the process of detection, the invention overcomes the defect of measuring temperature drift caused by the environmental temperature variation and improves the accuracy and the sensitivity of the thermal conductivity gas detection.

Description

technical field [0001] The invention relates to an environment temperature compensation system for improving the accuracy of heat conduction gas detection, in particular to a constant temperature and heat insulation system for heat conduction gas detection. Background technique [0002] Thermal conductivity sensor is one of the earliest sensors used in the field of gas detection. Its working principle is based on the fact that different gases have different thermal conductivity, and changes in gas concentration will cause changes in the thermal conductivity of the mixed gas. The thermal conductivity of the thermal conductivity sensor has the characteristic that the resistance changes with temperature. When a current passes through the thermal conductivity of the thermal conductivity sensor, the thermal conductivity is heated. Due to the thermal conduction of the gas to be measured, part of the heat of the thermal conductivity is taken away by the gas to be measured. , the t...

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Problems solved by technology

[0008] In view of this, in order to overcome the thermal conductivity sensor in the prior art that is greatly affected by the change of ambient temperature, resulting in poor detection accuracy, low sensitivity, and large temperature drift of the thermal conductivity sensor, the present invention provides a constant temperature sensor that can eliminate the interference of environmental temperature changes. Thermal insulation system to achieve accurate analysis and high-sensitivity detection of the measured gas concentration

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