SU1589206A1 - Apparatus for introducing sample to gas chromatograph - Google Patents

Abstract

This invention relates to devices for automatically introducing samples of an analyzed liquid into a gas chromatograph evaporator. The aim of the invention is to simplify the design and improve the accuracy of sample dosing. The device contains a dispenser, an evaporator with two inlet nozzles, one of which is connected to the sample introduction channel, and the other to the carrier gas supply channel. The dispenser is made in the form of a housing with channels for the supply and output of the analyzed liquid, the supply of carrier gas and sample inlet, the introduction of carrier gas into the evaporator and the discharge of carrier gas. All channels are pairwise brought to a common surface by holes that are located relative to each other at a distance of a stroke closely adjacent to this surface of the spool. A bypass channel, a calibrated channel and two switching channels, perpendicular to the calibrated channel and located symmetrically to each other on the side opposite to the bypass channel, are made in the spool. One switching channel in the sample loading position is connected to the carrier gas supply channel and to the carrier gas input channel to the evaporator connected to the second evaporator fitting. The second switching channel is connected to the sample introduction channel and to the carrier gas discharge channel. 4 il.

Description

This invention relates to devices for automatically introducing samples of a liquid to be analyzed into a gas chromatograph evaporator.

The purpose of the invention is to simplify the design and improve the accuracy of sample dosing.

FIG. Figures 1 and 2 schematically depict a device with a spool mounted between the two halves of the housing, in two operating positions; FIG. 2 and 3 switching circuits in the embodiment with

unilateral arrangement of the body relative to the spool.

The proposed device includes a metering device made in the form of a housing 1 with a spool 2, and an evaporator 3. In the housing 1 there are channels for supplying 4 and discharging 5 the analyzed liquid, supplying carrier gas 6 and sample inlet 7, channel 8 for introducing carrier gas the evaporator and the channel E discharge the carrier gas from the evaporator. By contacting with the surface of the spool surface, a bypass pass was made.

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channel 10, calibrated channel 11 and switching channels 12 and 13.

The evaporator 3 has an inlet fitting I, connected by line 15 to the sample inlet channel 7, and a fitting 16, connected by line 17 to the dispenser channel 8, and an outlet fitting 18 connected to a chromatographic column (not shown). Channel 9 is connected to line

; 19 on which the throttle is mounted

I 20.

I The sampling device operates as follows.

When the spool 2 is in the loading position of the calibrated channel; 11 is analyzed by the liquid (Fig. 1), the carrier gas passes through the channels 6, 12, 8, line 17 and enters the evaporator 3, where it is divided into two streams, one of which blows the chromatographic column (not shown), and the other passes through choke 14, line 15, channels 7, 13, 9, line 19, throttle 20 and is vented to the atmosphere. This is followed by purging and cleaning of the entire input path from the residual liquid after the previous dosing cycle by the carrier gas heated in the evaporator.

After the end of the purge operation, the actuator (not shown) places the spool 2 in the sample inlet position in the evaporator (Fig. 2) At this moment the spool 2 connects the calibrated sample channel 11 to the channels 6 and 7 of the body and the gas carrier forces the liquid sample into the evaporator . .

In the process of introducing the sample into the evaporator, the channel 9 for discharge of the carrier gas is blocked, which eliminates the loss of the analyzed liquid at the initial moment of evaporation of the sample when an elevated pressure is created. After the time required to evaporate the sample (determined by calculation or experimentally), the spool is switched to the sample loading position (Fig. 1), and the cycle repeats.

The device allows the execution of the dispenser with one-sided location of the body relative to the spool.

what is illustrated in fig. 3 and t, on which the circles denote channels in the housing, and rectangles the spool channels, made in the form of grooves on its contacting surface with the housing. FIG. 3 shows the loading position, similar to that described in FIG. 1, and in FIG. The position of the sample in the dispenser is similar to that described in FIG. 2

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Claims (1)

Claim A device for introducing a sample into a gas chromatograph, comprising a dispenser made in the form of a housing with channels for supplying and outputting an analyzed liquid, supplying a carrier gas and introducing a sample, introducing a gas carrier into the evaporator and dumping the gas carrier, all channels being pairwise brought to the common surface by openings, located relative to each other at a travel distance of a spool tightly adjacent to this surface, on the counter surface of which a bypass channel is made, a calibrated channel connected in the loading position with supply and output channels of the analyzed liquid, and a switching channel perpendicular to the calibrated channel and located on the side opposite to the bypass channel, an evaporator with two inlet fittings, one of which is connected to the sample inlet channel, and a throttle connected to the carrier gas discharge channel It is distinguished by the fact that, in order to increase the metering accuracy and simplify the design, an additional switching channel is located in the spool, which is located symmetrically with the first switching channel perpendi ulyarno calibrated channel and connected to the loading position of the sample with a channel for supplying a carrier gas and a carrier gas input channel of the evaporator coupled to a second nipple of the evaporator, a first switching port is connected to the sample input channel and channel .sbrosa carrier gas. Carrier gas Analyzing liquid 57777777% ^to Υ777 // 777 ///// Δ ΈΓ ¢ //// 7¼½. V Figure 2