Constant temperature insulation system for thermal conductivity gas detection

A gas detection and thermal conductivity technology, which is applied in the direction of material resistance, can solve the problems of low sensitivity, poor detection accuracy of thermal conductivity sensors, and large temperature drift, and achieve the effect of overcoming measurement temperature drift and improving accuracy and sensitivity

Inactive Publication Date: 2010-02-24
丁五行 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Constant temperature insulation system for thermal conductivity gas detection
  • Constant temperature insulation system for thermal conductivity gas detection
  • Constant temperature insulation system for thermal conductivity gas detection

Examples

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Effect test

Embodiment 1

[0037] A constant temperature and heat insulation system for thermal conductivity sensor gas concentration detection, which is composed of a thermal conductivity sensor constant temperature unit and an air duct constant temperature unit. The thermal conductivity sensor constant temperature unit consists of a gas conduction chamber 9 and a thermal conductivity sensor fixed in the gas conduction chamber 9 11 and an air conduction chamber heating and temperature control system. The air conduction chamber 9 in the constant temperature unit of the thermal conductivity sensor is made of copper material, and the resistance wire 12 that can adjust the voltage at both ends is tightly wound on it for heating. The air conduction chamber 9 The platinum resistor 10 monitors the temperature in the chamber in real time, and the outer periphery of the air guide chamber is wrapped with polyurethane foam material to form a heat insulating layer 13. The air guide tube constant temperature unit is ...

Embodiment 2

[0040] A constant temperature and heat insulation system for gas concentration detection with a thermal conductivity sensor is basically the same as that of Embodiment 1, except that the thermal conductivity sensor constant temperature unit and the air duct constant temperature unit are two independent unit modules connected together through pipelines.

Embodiment 3

[0042] A constant temperature and adiabatic system for gas concentration detection with a thermal conductivity sensor, including an air duct constant temperature unit, such as image 3 As shown, the air duct constant temperature unit directly heats a U-shaped tubular filter, which is filled with copper powder, and the tubular filter has a very small ventilation hole; the gas enters from the inside of the U-shaped tubular filter and flows through the filter When it is heated, it reaches the outside of the filter and collects, and is in full contact with the thermal conductivity sensor to detect the gas concentration.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/18
Inventor 丁五行李群李宝明
Owner 丁五行
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