A Method for the Highly Accurate Quantification of Gas Streams by On-Line Chromatography

This paper presents a method for the quantification of gas streams from reactive systems using on-line gas chromatography. The method is based on the mathematical development of correlations between the quantities detected by a set comprised of a thermal conductivity detector, a methanizer, and a flame ionization detector. The method allows for a complete and physically meaningful quantification of the composition of gas streams.<br>

A Method for the Highly Accurate Quantification of Gas Streams by On-Line Chromatography

This paper presents a method for the quantification of gas streams from reactive systems using on-line gas chromatography. The method is based on the mathematical development of correlations between the quantities detected by a set comprised of a thermal conductivity detector, a methanizer, and a flame ionization detector. The method allows for a complete and physically meaningful quantification of the composition of gas streams.<br>

Fabrication of Thermal Conductivity Detector Based on MEMS for Monitoring Dissolved Gases in Power Transformer

In this work, a high sensitivity micro-thermal conductivity detector (μTCD) with four thermal conductivity cells was proposed. Compared with conventional TCD sensors, the thermal conductivity cell in this work was designed as a streamlined structure; the thermistors were supported by a strong cantilever beam and suspended in the center of the thermal conductivity cell, which was able to greatly reduce the dead volume of the thermal conductivity cell and the heat loss of the substrate, improving the detection sensitivity. The experimental results demonstrated that the μTCD shows good stability and high sensitivity, which could rapidly detect light gases with a detection limit of 10 ppm and a quantitative repeatability of less than 1.1%.

Methodical aspects of quantitative elemental analysis of organic compounds using automated CHNS-analyzers

In this article the methodical aspects of quantitative elemental analysis of organic compounds on the automatic CHNS-analyzers, combining the method of Dumas-Pregl and gas chromatographic separation of analytic forms elements (N2, CO2, H2O, SO2) recorded by the thermal conductivity detector are explored. Also there are shown methods of calibration of the thermal conductivity detector, including the traditional way that uses one standard sample and the way that uses three standard samples with different quantitative content determined elements. Besides, attached the methodical approach, which is used in quantitative elemental analysis of organic compounds and their mixtures on the automatic CHNS-analyzers made on local and abroad plants, is based on operative control of calibration characteristics that we get from the thermal conductivity detector (characteristics and results of a standard sample of known composition before and after elemental analysis of unknown compound).