A constant temperature conductivity detection device and detection method

Abstract

The invention discloses a constant-temperature conductive detection device and method. The constant-temperature conductive detection device comprises an inlet, an outlet, a pipeline, a semiconductor chilling plate, a thermal insulation material, a heat conduction material and a detection cell, wherein the semiconductor chilling plate comprises a cold surface and a hot surface which are isolated by virtue of the thermal insulation material; and the cold surface and the hot surface are respectively adhered with a cold surface heat conducting material and a hot surface heat conducting material, and the pipeline is connected with the inlet, sequentially passes through the cold surface heat conducting material and the hot surface heat conducting material and is sequentially connected with the detection cell and the outlet. According to the constant-temperature conductive detection device, in an aspect of output signals, a tested solution is always maintained at a set testing temperature and is not influenced by the environment temperature, so that the detection precision is improved.

Description

technical field [0001] The invention belongs to the technical field of detection and inspection, and in particular relates to a constant temperature conductance detection device and a detection method. Background technique [0002] Conductivity detector is a crucial detector for ion chromatography. Conductivity detection cell is the flow cell of the liquid to be detected. The detection cell directly contacts the liquid to be detected and uploads the detection signal to the signal acquisition and processing part. The structure and performance of the detection cell directly affect the output signal, and the temperature change of the solution and the detection cell is one of the main factors affecting the stability of the detection signal. The resistance of the solution decreases with the increase of temperature, that is, when the concentration of the solution is constant, Its conductivity increases with the increase of temperature, and its increase rate is about 2% / ℃. In addi...

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Problems solved by technology

[0003] Preheating the solution can make up for the influence of the solution as the temperature rises when the temperature of the tested solution is lower than the set test temperature, but when the ambient temperature is higher than the set preheating temperature, it is difficult to achieve the purpose of constant temperature. Moreover, other electric-related components in the entire flow system are also heating, and the conductance value of the detection solution will appear to be rising on the surface, and it is difficult to achieve a real constant temperature of the system.

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