Device for preparing control gas mixtures

FIELD: instrumentation.

SUBSTANCE: device for preparing control gas mixtures comprises a gas mixer, at least one channel for supplying target gas to the gas mixer, at least two channels for supplying the diluent gas to the gas mixer, and the channel for output of the gas mixture from the gas mixer. And in each channel for supplying gas to the gas mixer the mass flow controller of gas and a solenoid valve are mounted successively, at least in one channel for supplying the diluent gas to the gas mixer the gas humidifier and the solenoid valve are mounted successively. In each of the channels equipped with the gas humidifier at least one bypass pipeline with the additional solenoid valve is mounted. and the output of the gas flow controller of this channel is connected to the input of the additional pipeline which output is connected to the output of the last solenoid valve, and at the input of the target gas and the input of the diluent gas at least one filter is mounted, which outputs are connected to the inputs of manually operated valves.

EFFECT: possibility of operational automated obtaining the dry or moist gas mixture, and reliable obtaining of the given values of concentrations of gas mixtures at the output of the device.

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The invention relates to the field of analytical instrumentation and preparation of calibration gas mixtures (CBC), which allows the complex to carry out the preparation and control of the humidified test gas mixtures required concentrations and possible to automate the process of tuning, calibration and calibration with gas analyzing devices.

A device for preparation of calibration gas, presented in the proceedings IMEKO world Congress Fundamental and Applied Metrology, namely: Nuno J.F. Rodrigues, Paulo Gomes. GAS ANALYZERS CALIBRATION BY DYNAMIC DILUTION FOR MONITORING AIR POLLUTION AND AIR EMISSIONS // XIX IMEKO World Congress Fundamental and Applied Metrology, September 6-11, 2009, Lisbon, Portugal, p.2217-2220 (http://www.imeko2009.it.pt/Papers/FP_222.pdf). Gas mixing device is a dynamic gas mixer, the principle of which consists in mixing streams of initial target gas and the diluent gas, flow rate of which is regulated and measured using mass flow controllers gas. The device includes one or more channels for the supply of the target gas in the mixer, multiple channels for the supply of the diluent gas in the mixer and channel for output of the gas mixture from the mixer. In each channel for the supply of the gases in the mixer consistently set the mass flow controller and gas solenoid valve.

Used the e part of the known device controllers mass flow rate allows to obtain a gas mixture in a wide range of concentrations, that increases the possibility of using the device. The disadvantages of this device is the inability to prepare gas mixtures with specified parameters humidity, as well as increased cost CBC applied to the device, due to the material costs of the additional installation of the humidifier or the use of additional a humidity generator to the system for producing humidified gas mixtures.

A device for preparation of calibration gas mixtures containing a source of calibration gas or mixture of gases in the form of a cylinder of a high pressure mixer gases and dilution of the gas mixture after the mixer additional flow of the diluent gas (Patent RF №2208783, publ. 20.07.2003), device mixer gases made in the form of a vessel having two channels for supplying mixed gases, one of which is connected through a controlled shut-off valve with a source of calibration gas or mixture of gases, and the second channel is connected to atmospheric air, the channel to output a mixture of gases, which is connected to the system dilution of the gas mixture and which has a detector for monitoring the content of the calibration gas and the pump flow rate, and the device introduced an additional detector to control the content of the test gas in the mixer.

In the well-known us the device you want to control the content of the gas mixture at the outlet, what is possible with the detector at a specific gas, the accuracy of which determines the precision cooking gas mixture. Temporary instability characteristics of the detector affects the accuracy of the prepared gas mixture. In this device the necessary filtering atmospheric air is used as the diluent gas. The device does not allow you to prepare a gas mixture of a given relative humidity.

Often, however, for the calibration and verification of gas analyzing devices and sensors (for example, solid-state, electrochemical) is required to humidify the calibration gas mixture, which is used additionally various kinds of humidifiers gases or generators humidity, through which humidified gas mixture supplied from the mixer to the device, which increases material costs and increase in the cost of ASG and setup.

The technical nature of the known devices closest to the claimed device is a device for preparing calibration gas mixtures under dynamic conditions (Patent RF №114528, publ. 27.03.2012). In the device for preparing calibration gas mixtures under dynamic conditions, mixer containing gases, at least one channel for supplying a target gas in the gas mixer, at least two of the of the channel for the supply of the diluent gas in the gas mixer and the channel for the output of the gas mixture from the mixer gases, where in each channel for supplying a gas in the gas mixer consistently set the mass flow controller and gas solenoid valve, at least one channel for the supply of the diluent gas in the gas mixer installed gas humidifier and an additional solenoid valve, and the controller output gas flow of the channel is connected through the solenoid valve with the inlet of the humidifier gas, the output of which is connected with an additional solenoid valve.

The installation of the humidifier gas, at least one of the channels for the supply of the diluent gas in the gas mixer allows you to create output of this channel is 100% relative humidity the diluent gas. The required relative humidity obtained in the mixer gases calibration gas mixture is created by mixing dry the diluent gas, wet gas diluent and dry the target gas. Using the automatically switchable solenoid valve, including an additional solenoid valve in the feed channel wet the diluent gas, and the selection of the mode controllers mass flow of gas is provided preparation of calibration gas mixtures not only with a wide range of concentration, but also with a wide range of relative humidity.

Installation onlinedelegates, in at least one of the channels for the supply of the diluent gas in the gas mixer eliminates the additional task of acquisition and installation of various devices for humidifying the obtained calibration gas mixtures, if necessary, prepare the wet sand, reduces material costs and reduces the cost of the CBC applied to the device.

Undeniable convenience for users is the possibility of automated simultaneous receipt of gas mixtures selected concentration and humidity in a wide range of concentrations and relative humidity in a single device.

The disadvantages of this device is the inability to quickly automated to obtain a dry gas mixture without removing/installing the humidifier, and the absence at the entrance of the target gas and the diluent gas filters for ASG to prevent contamination of the gas lines and damage controllers mass flow rate, which is the Metrology tool of measurement (Metrology equipment).

The specified device for preparing calibration gas mixtures under dynamic conditions is taken as a prototype.

The technical result that will be obtained by carrying out the invention, consists in the possibility of rapid avtomatizirov the aqueous obtain dry or humidified gas mixture, not using the time for removal/installation of the humidifier, thus reducing the number of operations in the process when carrying out adjustment, calibration and calibration, as well as the opportunity to obtain reliable values of the concentrations of gas mixtures at the output when using the input of the target gas and the entrance of the diluent gas filter for filtering the target gas and the diluent gas.

This technical result is achieved that the device preparation of calibration gas mixtures containing the gas mixer, at least one channel for supplying a target gas in the gas mixer, the at least two channels for the supply of the diluent gas in the gas mixer and the channel for the output of the gas mixture from the gas mixer in each channel for supplying a gas in the gas mixer consistently set the mass flow controller and gas solenoid valve, at least one channel for the supply of the diluent gas in the gas mixer sequentially installed humidifier gas and the electromagnetic valve, each channel is equipped with a humidifier gases installed, at least one bypass line with an additional solenoid valve, and the controller output gas flow of the channel connected to the input facilities the Noi highway, the output of which is connected to the output of the last of the electromagnetic valve, and at the entrance of the target gas and the entrance of the diluent gas is installed at least one filter, the outputs of which are connected with inputs of manual valves.

Each channel is equipped with a humidifier gases, install at least one bypass line with an additional solenoid valve is used to provide rapid, automated acquisition of dry (0% relative humidity) or humidified gas mixture (up to 100% relative humidity), without the time consuming removal/installation of the humidifier, thus reducing the number of operations in the process when carrying out adjustment, calibration and calibration.

Installation at the entrance of the target gas and the gas inlet of the diluent, at least one filter allows you to reliably get the value specified concentrations of gas mixtures on the output device with declared metrological characteristics error of cooking gas mixtures.

The drawing shows a device for the preparation of calibration gas mixtures.

The proposed device for the preparation of calibration gas mixtures contains a gas flow regulators 1, automatically switching the electromagnetic valves 2, the humidifier 3, manual valves 4, the channel C is left gas 5, channel 6 to output the prepared gas mixture, the filters 7, 8 channels for supplying the diluent gas mixer gas 9.

Gas diluent and the target gas through the filter 7 with a nominal pore size of 0.5 μm (remove contaminating particles from the system) and through the manual valve 4 is supplied to the gas flow regulators 1 on channels 5 and 8. The gas flow is set and maintained by the application service device via the RS232 interface of the PC. The switching of the respective channels to the output collector is made of the electromagnetic valve 2. In one of the channels of the diluent gas is selected humidifier gas mixture 3 installed, at least one bypass line with an additional solenoid valve 2, and the controller output gas flow of the channel is connected to the input line, the output of which is connected to the output of the last of the electromagnetic valve 2. Cooked with a given concentration of gas diluent and the target gas through the channels 5 and 8 go to the gas mixer 9, mixed, and cooked the gas mixture discharged through the channel 6.

Device preparation of calibration gas mixtures is as follows.

In General, the device of preparation of calibration gas mixtures is a dynamic gas mixer, the principle of action to the showing consists in mixing flows of the target gas and the diluent gas, the flow rate of which is regulated and measured using mass flow controllers gas. The required values of costs and the value of molar volume proportions of the components in the prepared mixtures are set using a PC that is built into the device.

Preparation of gas mixtures produced by dosing the target gas with the installed volume fraction of the target component in the pure gas diluent. Undeniable convenience for users is the ability to simultaneously receive the humidified gas mixtures.

When the device is preparation of calibration gas mixtures of the target gas and gas diluent go through the controls gas flow in the gas-solvent under the action of pressure difference between inlet and outlet channels. In the mixer and the resulting mixture was dosed gas and the diluent gas is reduced to a homogeneous composition and then served for consumption.

The basis of calculation of the composition of the mixture is the material balance for the designated component in the dosed gas, gas-diluent and the mixture.

Using a humidifier creates the required relative humidity of the gas mixture by mixing dry and wet gas diluent.

Device preparation of calibration gas mixtures has a linear mode of operation, which involves the connection of all Cana is s gas diluent and the target gas at the outlet of the device. This mode allows you to provide at the output the preparation of gas mixtures with broad parameters of concentration, flow rate and humidity and to maintain the specified characteristics of the time required for carrying out the adjustment, calibration and calibration gas analyzing devices.

Device preparation of calibration gas mixtures made in the form of a separate table of the block and is a complex device, including electronic, mechanical and Electromechanical parts and components.

The device has an input fittings for supply of the diluent gas and the target gas and an outlet fitting for the selection of the gas mixture under test sensors and sensors for measuring parameters of a gas environments. Each channel features two switchable valve and one control the gas flow rate. Ball manual gates at the inputs of gas channels are also designed to feed into the device target gas (ASG) or the diluent gas to clear (purge) gas channels.

Using the automatically switchable electromagnetic valves and selection of the mode of flow regulators are spending target gas and the diluent gas in each of the channels set by the user and controlled by flow regulators gas is.

The use of thermal mass flow controllers gas can significantly reduce the environmental impact and the input pressure of the gas on the accuracy of the gas flow, thus reducing the accuracy of the prepared gas mixture. Control of gas flow regulators and valves are manufactured using the PC.

Software for remote control operation modes of the device allows you to accelerate the setup, calibration and calibration gas analyzing devices for automating calculations and mixing of gases.

Thus, the proposed design of the device for preparation of calibration gas mixtures provides the achievement of the technical result, namely:

the responsive automated acquisition dry (0% relative humidity) or humidified gas mixture (up to 100% relative humidity), without the time consuming removal/installation of the humidifier, reducing the number of operations in the process when carrying out adjustment, calibration and calibration;

- obtaining reliable values of the concentrations of gas mixtures on the output device with declared metrological characteristics error of cooking gas mixtures.

Sources of information and

1. Materials IMEKO world Congress Fundamental and Applied Metrology: Nuno J.F. Rodrigues, Paulo Gomes. GAS ANALYZERS CALIBRATION BY DYNAMIC DILUTION FOR MONITORING AIR POLLUTION AND AIR EMISSIONS // XIX IMEKO World Congress Fundamental and Applied Metrology, September 6-11, 2009, Lisbon, Portugal, p.2217-2220 (http://www.imeko2009.it.pt/Papers/FP_222.pdf).

2. RF patent №2208783 published 20.07.2003.

3. RF patent №114528, published on 27.03.2012 prototype.

Device preparation of calibration gas mixtures containing the gas mixer, at least one channel for supplying a target gas in the gas mixer, the at least two channels for the supply of the diluent gas in the gas mixer and the channel for the output of the gas mixture from the gas mixer in each channel for supplying a gas in the gas mixer consistently set the mass flow controller and gas solenoid valve, at least one channel for the supply of the diluent gas in the gas mixer sequentially installed gas humidifier and a solenoid valve, characterized in that each of the channels equipped with a humidifier gases installed, at least one bypass line with an additional solenoid valve, and the controller output gas flow of the channel is connected to the input line, the output of which is connected to the output of the last of the electromagnetic valve, and at the entrance of the target gas and the gas inlet-RA is Beviale installed, at least one filter, the outputs of which are connected with inputs of manual valves.



 

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