UNIVERSAL CHEMICAL ANALYSIS SYSTEM FOR GAS CHROMATOGRAPHY, SAMPLING VALVE AND GAS DENSITY DETECTOR Russian patent published in 2013 - IPC G01N30/02 

FIELD: chemistry.

SUBSTANCE: sampling valve has a housing 1 with valves 4 in the base, a swivelling bushing 2 having valves 5, an axis 3, a spring 6, a removable feeder 10, an inlet pipe for the carrier gas 14 and a pipe for discharging the analysed gas 13, as well as a temperature-controlled base 18. The temperature-controlled base 18 has two sockets 19 for fluoroplastic ampoules 20, which are connected to each other by a channel 24, as well as a channel 31, which is connected by a pipe 32 to the channel 4 of the housing 1. The channel 15 of the housing 1 is connected by a pipe 26 to the channel 28 of the temperature-controlled base 18 with a soldered nozzle 29 for connecting an analytical column, and in the swivelling bushing 2, channels 16 are connected to channel 17. Openings in the temperature-controlled base 18 and openings in the base of the sampling valve are respectively hermetically connected by pipes 26 and 32 to rubber rings 27 and 33. The sampling valve and gas density detector are used to determine initial concentrations for basic calibration and relative sensitivity coefficients (RSC) on substances for a flame-ionisation detector (FID) or a thermal conductivity detector (TCD) and basic calibration on hexane, benzene and propane is carried out and calibration on RSC is calculated. Sensitivity of other detectors is determined from concentrations determined with FID or TCD.

EFFECT: shorter duration of investigation for developing analysis, reduced labour input in conducting investigation by avoiding the need to develop special methods for each type of research and reduced material consumption, high accuracy of analysing samples.

11 cl, 6 dwg