SU1011213A1 - Apparatus for preparing gaseous calibrated mixtures - Google Patents

Abstract

A device for the preparation of gas-calibrated mixtures, including a mixing chamber with a stopper, supplying and discharging tubes with taps and a syringe dispenser, characterized in that, in order to improve the accuracy of the preparation of gas mixtures, the device is equipped with an additional chamber with the mixing chamber with a stopper placed coaxially with the stopper of the mixing chamber, and the syringe up to. the congestion is movable relative to both plugs.

Description

The invention relates to gas analytical measurements, and in particular to a device for preparing gas mixtures and can be used in various fields of technology for calibration of gas analysis. 5

A device for the preparation of gas mixtures is known, consisting of a glass pipette with a Teflon disk, a vacuum pump and a manometer [1].

The disadvantage of this device is the need for preliminary evacuation of the vessel and evacuation of the connections with the pipette before introducing each component. In addition, errors of 'j 5 are possible when diluting a gas mixture by pumping it to a certain pressure to obtain a mixture with a low content of components.

The closest to the proposed θ ₂ is an apparatus for preparing gas mixtures consisting of a glass pipette, provided with valves for supplying a main component (or .gaza carrier) The mirrors rubber ₂ 5 Ci through which the syringe is introduced calculated volume of gas impurities and Teflon disk with holes for mixing the contents of the pipette [2].

The disadvantage of this device is the need to transfer the syringe filled with the component of the gas mixture to a glass pipette, and then transfer it, filled with the prepared gas mixture, to the chromatograph dispenser through the air. In this case, part of the gas filling the syringe may be lost or its composition may be changed due to mixing with air, which leads to distorted results.

The purpose of the invention is to increase the accuracy of 40 preparation of gas mixtures.

This goal is achieved in that the device for preparing calibrated gas mixtures, including a mixing chamber with a stopper, inlet and outlet tubes with taps and a metering syringe, is equipped with an additional 5Q chamber connected to the mixing chamber with a stopper coaxially. the plug of the mixing chamber, and the syringe dispenser is mounted with the possibility of movement relative to both plugs. 55

The drawing shows the proposed device, General view.

The mixing chamber 1 is equipped with glass tubes 2 inlet and 1 “3” with 3 taps 4. Inside the chamber 1 there is a Teflon disk 5 with holes for mixing the contents of the pipette.

Additional chamber 6 is connected to the mixing chamber 1 ka. cork stopper 7.

The chamber b is equipped with glass bends for washing it with the components of the mixture and a carrier gas. For isolation from the environment, the chamber 6 is equipped with a rubber stopper 8, placed coaxially with the stopper 7, a syringe dispenser (not shown; with the possibility of movement relative to both stoppers 7 and 8, is installed in the stopper 8.

The device operates as follows.

The mixing chamber 1 is purged with one of the components. Then the taps 4 are closed. Chamber b is purged with another component of the gas mixture. A syringe is pumped with the same component, the end of the needle of which is in chamber b. The calculated amount of the second component is taken with a syringe and fed through the rubber stopper 7 into the mixing chamber 1. The components are mixed with the disk 5. The syringe remains in its working position, it is only slightly pulled up so that the end of the needle is buried in the stopper. After mixing, the syringe needle 'enters the mixing chamber 1 and the syringe is pumped with the gas mixture. The chamber 6 is purged with the carrier gas, then the calculated volume is collected with a syringe, the gas mixture from the mixing chamber 1 and this amount is introduced into the chamber 6. The amount of the gas mixture from the chamber 6 is carried away by the carrier gas to the chromatographic column. In the case of preparing a multicomponent gas mixture, the chamber 6 is blown by each subsequent component, the calculated volume of this component is taken with a syringe and introduced into the mixing chamber 1.

Using an additional camera compares the proposed device from the prototype, since the isolation of the syringe from the environment eliminates the possibility of losing part of the gas from it or changing the composition of the gas due to mixing with air, which significantly increases the accuracy of the preparation of gas mixtures.

VNIIIPI Order 2621/8

Circulation 686 Subscription

Branch of PPP Patent ’, 'Uzhhorod, st., Project, 4

Claims (1)

DEVICE FOR PREPARING GAS CALIBRATED MIXTURES, including a mixing chamber with a stopper, inlet and outlet tubes with taps and a metering syringe, characterized in that, in order to improve the accuracy of preparing gas mixtures, the device is equipped with an additional chamber connected to the mixing chamber by means of a stopper placed coaxially to the stopper of the mixing chamber, and the syringe is up to. the mash is installed with the ability to move Relatively., both traffic jams.