SU1442902A1 - Apparatus for analysing gas mixture - Google Patents

Abstract

The invention relates to devices for analyzing a mixture of gases using ultrasonic oscillations and can be used to determine nitrogen dioxide in flue and flue gases. The purpose of the invention is to increase the sensitivity due to the creation of a constant pressure in the chamber. The wall 5 of the test chamber 4 is made in the form of a flexible membrane. When compressed gas is supplied to chamber 4, the flexible membrane bends under the pressure of the test gas in the direction of radiation of ultrasonic vibrations created by the radiator 9, maintaining a constant resonant frequency. The cooled gas, turning into the solid phase, is deposited on the sensor-vibrator 7, the oscillation period of which depends on the amount of the solid phase of the gas under investigation. 1 il. S (l

Description

The invention relates to devices for analyzing a mixture of the elements with the help of ultrasonic vibrations and can be used to determine nitrogen dioxide in flue and flue gases.

The purpose of the invention is to increase the sensitivity and shorten the test time by creating a constant pressure in the chamber.

The drawing shows the block diagram of the device.

The device contains serially connected filter 1 mechanical impurities, desiccant 2 moisture, compressor 3 and test chamber

4, the wall is made in the form of a membrane

5. In the test chamber 4 there are placed a refrigerator 6, a sensor-vibrator 7 connected to the meter 8 of the oscillation period, an emitter 9 UTK connected to the generator 10-UZK, a heater 1. The outputs of the control unit 12 are connected to the meter 8 of the period, the generator UZK 10, a heater 11, a compressor 3, a vacuum pump 13 connected to the test chamber 4.

The device works in a very sensible way.

At the command of the control unit .12, the analyzed gas is preliminarily cleaned from filter 1 of mechanical impurities, dried from moisture by desiccant 2, then compressed to a certain pressure B. Compressor 3. Compressed gas enters the test chamber 4, the membrane 5 of which moves away from

1442902

Where

1 is the size of the chamber in the direction of movement of the movable wall.

In the test chamber 4, with the help of the cooler 6, the temperature is set below the freezing temperature of the analyzed component of the tested gas mixture.

At the command of the control unit 12, the transmitter 9 UZK is turned on for a certain time, after it is turned off, the vacuum pump 13 is turned on, the gas from the test chamber 4 is pumped out and, after reaching a certain amount of vacuum, the oscillation period of the sensor-vibrator 7 is measured by an oscillation period meter 8. Measuring the oscillation period, the control unit 12 issues a command to heat the vibrating sensor 7 by the heater 11 to the temperature at the evaporation temperature of the test gas. Then the heater 1 and the vacuum pump 13 are turned off.

Claims (1)

Invention Formula A device for analyzing a mixture of gases, containing, in series, a desiccant, a filter of mechanical particles, a compressor and a test chamber for the analyzed mixture, refrigeration and heating elements placed in it, a vibrating sensor, an oscillation period meter connected to it, an ultrasonic oscillation emitter connected with him relative to the test chamber 4 under the oscillation generator, a vacuum pump. the pressure of the test gas in the direction of the radiation of ultrasonic vibrations - and the movement of the membrane 5 of the chamber 4 takes place depending on the pressure of the gas in such a way that it is equal to 1 C1P) P-, 2f 45 connected to the test chamber, and a control unit, differently so that, in order to increase the sensitivity and reduce the test time, one of the walls of the test chamber, passing through the axis of the radiator, is made in the form of a flexible membrane. connected to the test chamber, and a control unit, differently so that, in order to increase the sensitivity and reduce the test time, one of the walls of the test chamber, passing through the axis of the radiator, is made in the form of a flexible membrane.