RU55136U1 - DEVICE FOR SAMPLING FROM A CLOSED GAS-CHROMATOGRAPHIC BOTTLE - Google Patents

Abstract

A device for sampling from a closed gas chromatographic bottle relates to a technique for analyzing the composition of gases, in particular, to a gas chromatographic analysis of the oxygen content in sealed bottles using a syringe. The objective of the utility model is to simplify the sampling technology. The technical result of this invention is to increase the sampling rate while maintaining its high accuracy. To achieve a technical result, a device for sampling from a closed gas chromatographic bottle contains means for holding the bottle, means for sampling a gas sample in the form of a sampler with a needle, and a working chamber with an axial guide channel for the needle. At the same time, a clamp for introducing the needle in any of its intermediate positions and located on the body of the sampler is introduced into the composition for sampling the gas sample. For the device to work, it is necessary to release the rubber plug from the cap. Turn the knob, this leads to a vertical movement of the sleeve and bracket. In this case, the working chamber with its open end is pressed against the surface of the cork. A needle is inserted through the channel into the vial and a gas sample is taken. After sampling the gas, the rod is fixed with a clamp and the needle is raised. The main advantages of the device for sampling from a closed gas chromatographic bottle are: an increase in the sampling rate while maintaining the metrological characteristics of the sample taken, simplification of the device due to the absence of inert gas and the necessary pneumatic equipment, simplification of the sampling process, which is confirmed by the long-term operation of the device in the research laboratory SVIRKHBZ. 1ill.

Description

The utility model relates to a technique for analyzing the composition of gases, in particular, to a gas chromatographic analysis of the oxygen content in sealed vials using a syringe.

A device for sampling a gas sample from a vial (Karabanov N.T. et al. Factory laboratory, No. 2, 1984, p.16-17) containing a chamber purged with neutral gas, inside which is part of the body of the syringe that is in close contact with the rubber gaskets cameras. When sampling, the open end of the chamber is pressed by hand to the rubber stopper of the vial and, by moving the syringe, pierce the stopper with a needle and take the sample.

However, in the known device, the chamber is structurally complex and the device does not provide an accurate analysis carried out by the absolute calibration method, due to dilution of the sampled gas with excess neutral gas pressure, since there is no channel for the exit of neutral gas in the chamber.

There is another device for sampling a gas sample from a bottle (USSR Author's Certificate N 149733, IPC G 01 N 1/22 "Gas Translator", 1962) containing means for holding the bottle, means for sampling a gas sample in the form of a needle, and a working chamber with an axial guide a channel for the needle and a channel for the exit of gas. In it, when transferring a gas sample to a receiver, a jar preserved by a core is placed in the adapter glass and closed with a lid. After that, the receiving line is connected to the fitting and a vacuum is created in it by pumping air, and then the can lid is pierced with a needle, ensuring the transfer of the gas sample from the can to the receiver (vacuum detector) without air access.

However, in the known device, with direct sampling by a needle from a bottle, it is possible to suck in air after removing the needle from the bottle, when the gas pressure in it is less than atmospheric. This can lead to an erroneous analysis result.

The closest in technical essence is the "Device for sampling a gas sample from a bottle" (RF patent No. 2084856 from 07.20.1997, IPC G 01 N 1/22). In it, the device contains a base on which a rack with a mobile bracket is mounted and a socket for installing the bottle is made. A cylindrical working chamber with an axial guide channel for a needle, means for sampling a gas sample and a channel for gas outlet is mounted on the bracket.

Sampling is as follows. First, the working chamber is blown through the channel with neutral gas, after purging, its pressure is reduced to a minimum. After sampling the gas, the needle is slowly raised, holding its end in the chamber for 2-3 seconds. In this case, in the case of a gas reduced in comparison with the atmospheric pressure in the vial, part of the neutral gas will enter into it through the needle, ensuring an accurate analysis. Next, the cycle repeats.

The disadvantage of this device is the obligatory presence of inert gas, which requires additional equipment with a cylinder. In turn, this reduces the mobility of the device (installation) and complicates the operation of the device.

The objective of the utility model is to simplify the sampling technology.

The technical result of this invention is to increase the sampling rate while maintaining its high accuracy.

To achieve a technical result, a device for sampling from a closed gas chromatographic bottle contains means for holding the bottle, means for sampling a gas sample in the form of a sampler with a needle, and a working chamber with an axial guide channel for the needle. At the same time, a clamp for introducing the needle in any of its intermediate positions and located on the body of the sampler is introduced into the composition for sampling the gas sample.

In Fig.1 shows a view of the entire device, and in Fig.2 - only the working chamber,

where: 1 - base;

2 - rack;

3 - a mobile arm;

4 - nest;

5 - gas chromatographic bottle;

6 - a working chamber;

7 - axial guide channel;

8 - a needle;

9 - stock;

10 - a clamp;

11 - a longitudinal groove;

12 - sleeve;

13 - axis;

14 - a lifting wheel;

15 - flat steel springs;

16 - pen;

17 - a rubber stopper;

18 - aluminum cap.

The device comprises a base 1 on which a stand 2 with a movable bracket 3 is mounted and a socket 4 for installing a gas chromatographic bottle 5 is made. On the bracket 3, a cylindrical working chamber 6 is mounted with an axial guide channel 7 for a needle 8 of a gas sampling device, which includes a rod 9 and a latch 10. A longitudinal groove 11 is made on the rack 2, and the bracket 3 is rigidly connected to the sleeve 12 mounted for movement along the rack 3. A lifting wheel is mounted on the sleeve 12 via the axis 13 14, fixed by flat steel springs 15 located on both sides of the wheel 14. On the axis 13 is mounted a handle 16. The bottle 5 is closed with a rubber stopper 17 with an aluminum cap 18.

Sampling is as follows.

The rubber stopper 17 is released from the cap 18. The handle 16 is rotated, this leads to a vertical movement of the sleeve 12 and the bracket 3. In this case, the working chamber 6 is pressed against the surface of the stopper 17 with the open end 17. Insert the needle 8 through the channel 7 into the inside of the vial 5 and take a gas sample.

After sampling the gas, the rod 9 is fixed with a latch 10 and the needle 8 is lifted.

The main advantages of the device for sampling from a closed gas chromatographic bottle are:

- increase the sampling rate while maintaining the metrological characteristics of the selected sample;

- simplification of the device due to the lack of inert gas and the necessary pneumatic equipment;

- simplification of the sampling process, which is confirmed by the long-term operation of the device in the research laboratory of SVIRKHBZ.

Claims (1)

A device for sampling from a closed gas chromatographic vial, containing means for holding the vial, means for sampling a gas sample in the form of a sampler with a needle, and a working chamber with an axial guide channel for the needle, characterized in that a fixative for fixing the gas sample is introduced needles in any of its intermediate positions and located on the body of the sampler.