Device for preparation of calibration gas mixtures

 

(57) Abstract:

The invention relates to the field of instrumentation and can be used in the calibration and calibration of gas analyzers. The proposed device for preparation of calibration gas mixtures containing vessel to saturate the gas pairs substances, gas line for supplying gas into the vessel, a gas line for output of gas-steam mixture from the vessel, a device for dilution of the gas mixture, a gas line for supplying a flow of dilution gas in a device for dilution gas line to output the diluted gas mixture of fixtures for dilution in calibrated the detector and the pump flow rate. In the device entered the adsorber installed in the gas line to output the diluted gas mixture at the output calibrated to the transmitter or parallel to it. The invention extends the range of substances suitable for preparation of calibration gas mixtures. 4 C.p. f-crystals, 3 ill.

The invention relates to the field of instrumentation and can be used for preparation of calibration (calibration) and calibration gas mixtures used in the calibration of gas analyzers.

A disadvantage of the known device for the preparation of calibration mixtures is a limited range of substances that can be used as a source for preparation of the calibration mixture of substances, as only a very limited number of substances tested conditions of intercalation in the fluorinated carbon.

The closest to the technical nature of the present device is a device for preparation of calibration gas mixtures containing vessel to saturate the gas pairs substances, partially filled with the liquid substance, a gas line for supplying gas into the vessel in which it is interfering absorber mechanical impurities and impurity substances, gas line for output of gas-steam mixture from the vessel, a device for dilution of the gas mixture that is installed in the gas line for output of gas-steam mixture from the vessel, a gas line for supplying freemy the detector and the pump flow rate (see, for example, Guidance on the use of the generator controlled concentrations of substances in the air of the firm CAVKIT Ltd, UK, 1997).

A disadvantage of the known device, taken as a prototype, is a limited range of substances that can be used as a source for preparation of calibration mixtures, as only a very limited number of substances known exact values of the elasticity of steam at different operating temperatures of the vessel for saturation, which is the calculation of the concentration of the substance in the gas-diluent (air). This disadvantage is compounded by the fact that in the known device the gas (air) is blown into the vessel to fill with a pump, which creates in the vapour space of the vessel uncontrolled excessive (higher than atmospheric) pressure, the value of which is not taken into account when calculating the concentration of the substance in the gas.

The invention consisted in expanding the range of substances suitable for preparation of calibration gas mixtures.

This task is solved in that the device for preparation of calibration gas mixtures containing vessel to saturate the gas pairs substances gazowe substances, gas line for output of gas-steam mixture from the vessel, a device for dilution of the gas mixture that is installed in the gas line for output of gas-steam mixture from the vessel, a gas line for supplying a gas flow device for the dilution gas line to output the diluted gas mixture of fixtures for dilution in calibrated the detector and the pump gas flow, in which according to the invention introduced the adsorber installed in the gas line to output the diluted gas mixture of fixtures for dilution.

Another distinctive feature of the proposed device is that it introduced the gas flow divider installed in the gas line to output the diluted gas mixture of fixtures for dilution, one of the gas output of which is connected to the calibrated gas analyzer, and the other gas outlet connected to the adsorber, and the gas outlets of the gas analyzer and the adsorber is connected with the input of the pump flow.

Another distinctive feature of the proposed device is that it introduced a non-destructive detector type, installed in one of the gas outlets of the flow divider before the adsorber.

Among otpravki mixture, installed at the input of the detector is non-destructive type.

Another distinctive feature of the device is that the vessel to saturate the gas pairs substances supplied thermoelectric Converter to set the temperature and maintain the set temperature.

Thanks to the above features of the proposed device allows a standard gas mixtures with virtually any liquid under normal conditions, substances, as the concentration of the substance in the gas standard mixture, the proposed device is determined with high accuracy by determining the weight change of the adsorber for a certain period of time.

The invention is illustrated by drawings.

In Fig. 1 shows a schematic diagram of one of the simplest possible embodiment of the device.

In Fig. 2 presents a schematic diagram of the preferred option the device run.

In Fig. 3 shows a schematic diagram of the proposed device, equipped with a calibration detector non-destructive type.

In the simplest possible embodiment of the proposed device includes the La preparation of calibration gas mixtures. The vessel 1 is installed on the base 3 of the heat-conducting material which is in contact with thermoelectric Converter 4, intended to set the temperature and maintain a constant temperature vessel 1. The vessel 1 is also equipped with heat-insulating casing 5 designed to eliminate the effect of fluctuations in the ambient temperature to the temperature of the internal volume of the vessel 1. The vessel 1 is equipped with pipe 6 is blocked by the membrane 7 from ssamouplotnyayuscheysya material such as silicone rubber, is pressed against the end face of the pipe 6 with Union nut 8. The vessel has the pipes 9 and 10, designed respectively for input and output gas flow. The pipe 9 is connected with a gas line 11 for supplying a gas (air) into the vessel 1, which includes an absorber 12 preventing mechanical impurities and impurity substances. The absorber 12 is a tube (Fig. not shown), the input of which is mounted a filter for capturing mechanical impurities from a stream of air (dust, smoke, etc.,) and sequentially placed in the direction of gas flow layers of the particles of sorbent to absorb water vapor (e.g., silica gel) and other impurities substances (e.g., activated carbon). The pipe 10 is connected with the gas is isopropol mixture, withdrawn from vessel 1, an additional stream of gas (air) entering the device 14 to the gas line 15. Gas line 15 is connected with the ambient air and it has been consistently found to absorber 16 preventing mechanical impurities and impurity substances and the controller 17 of the gas flow. The absorber 16 is identical to the absorber 12. The output device 14 to dilute the gas mixture is selected to calibrate the detector 18, for example, a thermal conductivity detector. The output of detector 18 is connected to the adsorber 19 whose output in turn is connected to the booster 20 gas flow. The adsorber 19 is made in the form of a tube (Fig. not shown) filled with particles of a sorbent, such as activated carbon, intended to absorb the substances used for preparation of calibration gas mixtures. The booster 20 gas flow is a membrane pump or centrifugal type.

Set the device also includes a gas flow meter (Fig. not shown), for example, a bubble type commonly used in gas chromatographs for periodic control gas flow, or rotameter.

the CSOs substances, for example, hexane. The filling of the vessel 1 with the liquid substance is performed with a syringe (Fig. not shown), a needle through which the pipe 6, punctures pre-membrane 7 from ssamouplotnyayuscheysya material is injected into the internal volume of the vessel 1. Then the contents of the syringe is transferred to the vessel. In the vessel 1 set the desired temperature using a thermoelectric Converter 4 and thermostat (Fig. not shown). Then actuate the booster 20 consumption and calibrate the detector 18. The flow of gas (air) is sucked into the device through the inlet gas line 11 passes through the absorber 12, where it is freed from mechanical impurities (dust, smoke, etc.,), water vapor and other impurities substances usually contained in the air.

Cleaned from impurities, the gas stream enters the internal volume of the vessel 1 where it is saturated vapors of a substance in equilibrium with the liquid 2. The thread formed in the vessel 1 gas-steam mixture leaving the vessel 1 through the pipe 10 through the gas line 13 enters the fixture 14 for mixing, where it is diluted with an additional stream of gas (air) flowing through the gas line 15. This additional gas flow (air), sassy and impurity substances in the absorber 16. The rate of the additional gas flow (air) in the gas line 15 is controlled by the flow regulator 17. A dilute stream of gas-steam mixture from the fixture 14 is fed to calibrate the detector 18, the output of which is recorded on the chart recorder (Fig. not shown) or on the corresponding scale of the detector 18. Coming out of the detector flow of gas-steam mixture enters the adsorber 19, where the absorption of substances used for the preparation of gas-steam mixture. Released from the substance flow of the gas from the canister 19 is fed to the input of the booster 20 consumption and it is released into the atmosphere. The calculation of the concentration of a substance in a dilute gas mixture fed to calibrate the detector 18, is to change the weight of the adsorber, which is periodically disconnected from the respective gas lines and weighed, for a certain period of time and data volume flow rate of gas in the gas lines 11 and 15. The transition to the new value of the vapor concentration of the substance in the gas at the outlet of the fixture 14 for dilution is carried out by changing the gas flow in the gas line 15 through the controller 17 of the gas flow. Changes in the concentration of vapor of the substance VSTA.

The above-described embodiment of the device can be effectively used for calibration of these types of analyzers that do not change (destruction) or loss of substance, for example, thermal conductivity detector, gas analyzers optical type, etc., it is not suitable for calibration of these detectors, which are the destruction of the substance or losses, for example, detection of thermochemical type of detectors based on ionization of the substances in the flame, etc.

Presented on Fig. 2 schematic diagram of another possible variant of the proposed device differs from that described above (Fig. 1) the fact that it introduced the divider 21 flow installed in the gas line to output the diluted gas mixture from the fixture 14 for dilution. One of the outputs 22 of the divider 21 is flow connected to the inlet of the adsorber 19, and the other output of divider 23 21 flow is connected with the input of the calibrated detector 18, the output of detector 18 is installed pneumatic resistance 24, the resistance to gas flow which is approximately equal to the resistance of the gas stream adsorber. The output of the adsorber 19 and the output gazoanalising options for performing device is that the diluted gas mixture from the output of the device 14 for dilution flows into the divider 21 flow, where the gas flow is divided into two parts. One part of the flow from the output 23 of the divider 21 flows into the calibrated detector 18 and out through the pneumatic resistance 24 to the input of the booster 20 consumption. Another part of the flow of gas-steam mixture from the output 22 of the divider 21 flows into the adsorber 19, where the absorption of the substance. From the output of the adsorber 19 is released from the substance of the gas (air) is fed to the input of the booster 20 consumption. The divider 21 flow set, pre-measuring the gas flow rate at the input of the divider 21 and outputs the canister 19 and pnevmoobrushenija 24. By periodically weighing the canister 19 determine the amount of substance passing through the exit 22 of the divider 21 flow for a certain period of time and through the divider 21 determine the amount of a substance, held for the same period of time through the detector 18. Measuring the gas flow in the gas lines 11 and 15, and knowing the divider 21 and the amount of substance passing through the detector 18 for a certain period of time with high accuracy Rai.

The device shown in Fig. 2, allows you to calibrate the analyzers undergoing destruction or loss of substance, for example, a flame ionization.

Presented on Fig. 3 schematic diagram of one possible variant of the proposed device differs from that described above (Fig. 2) the fact that it introduced a highly sensitive detector 25 non-destructive type, for example, a photo-ionization detector, installed at the output 22 of the divider 21 flow before adsorber 19. While the input of the detector 25 is installed an additional device 26 to dilute the gas mixture, provided with an additional gas line 27 for supplying a dilution gas (air). In the gas line 27 sequentially installed absorber 28 prevent mechanical mixtures of substances and the controller 29 of the gas flow. The detector 25 is equipped with a microcomputer 30 which controls the operation of the detector and record his testimony. A feature of this variant of execution of the device (Fig. 3) is that it provides additional control readings calibrated detector 18 according to the testimony of pre-calibrated detector 25, mainly photoionize vessel to saturate the gas pairs substances, partially filled with the liquid substance, a gas line for supplying gas into the vessel in which it is interfering absorber mechanical impurities and impurity substances, gas line for output of gas-steam mixture from the vessel, a device for dilution of the gas mixture that is installed in the gas line for output of gas-steam mixture from the vessel, a gas line for supplying a gas flow device for the dilution of the gas mixture, the gas line for the conclusion of the diluted gas mixture to calibrate the detector and the pump gas flow, characterized in that it introduced the adsorber installed in the gas line to output the diluted gas mixture.

2. The device under item 1, characterized in that it introduced the gas flow divider installed in the gas line for output of gas-steam mixture at the output of the device for diluting, one of the gas output of which is connected to the calibrated analyzer composition, and the other gas outlet connected to the adsorber, and the gas outlets of the gas analyzer and the adsorber is connected to the input of the pump flow.

3. The device according to p. 2, characterized in that it introduced a non-destructive detector type, installed in one of Gotovina additional device for the dilution of the gas mixture, installed at the input of the detector is non-destructive type.

5. The device under item 1, or 2, or 3, or 4, characterized in that the receptacle for the gas saturation pairs of substances supplied thermoelectric Converter to set and maintain the desired temperature.

 

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