Large flow low disturbance constant temperature trace quantity thermal conductivity detector

Abstract

The invention discloses a large flow low disturbance constant temperature trace quantity thermal conductivity detector. The detector is characterized by comprising non-slip feet, an electric box, universal wheels, brackets, cables, a vent, a hot wire resistor, a working voltage device, a thermostat, a base, a work station, a baffle, a power board and a motor, wherein the brackets are four, a rectangular framework is composed of four vertical pipes and eight transverse pipes, and the thermostat is composed of a vacuum cover, a sample seat, a heater, a thermometer, a refrigerating machine, a vacuum valve, a base plate, a gas return interface, a gas inlet interface and a vacuum connector. The detector is advantaged in that the thermostat is set, the temperature can be effectively maintained to be a relatively stable state, influence of temperature difference on the impact of the hot wire and condensation generation is avoided, accuracy and sensitivity of detection can be more effectivelyimproved, cost is much lower than cost of utilizing original devices, the disturbance of the original airflow onto the hot wire can be greatly reduced through application of a serpentine tube, and thedamage rate of the hot wire is reduced.

Description

technical field [0001] The invention relates to a novel high-flow low-disturbance constant-temperature trace thermal conductivity detector, which belongs to the technical field of detector equipment. Background technique [0002] At present, most of the thermal conductivity pools use thermistor as the detection unit, which has the disadvantages that the equipment is greatly affected by temperature changes, poor linearity, and greatly affected by the external environment. At the same time, the components are expensive and other unfavorable factors, so it is necessary to promote the use in a large area. It brings certain unfavorable factors, especially the detection of trace elements, which will greatly affect the accuracy of the measurement under low flow conditions. [0003] The prior art discloses a large-flow low-disturbance constant-temperature trace thermal conductivity detector with the application number CN201620099159.8, which is characterized in that the positive and...

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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a new type of large-flow low-disturbance constant-temperature trace thermal conductivity detector to solve the problem that the existing equipment is greatly affected by temperature changes, has poor linearity and is under low-flow conditions. The accuracy of the measurement will be greatly affected, and the temperature difference will affect the impact on the hot wire and the problem of condensation

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