SU55158A1 - Automatic Gas Analysis Device - Google Patents

Description

Devices for automatically analyzing gases are already known by passing the test gas through a titrated solution and registering a change in the color of the solution by means of a photocell. In such devices, the gas under investigation is automatically sucked into the reaction vessel, the titrated solution is measured, the reaction vessel is emptied, and the gas volume is recorded as straight lines on the drum of the recording mechanism.

The proposed device for the automatic analysis of gases relates specifically to the discharge of this kind of devices and its feature lies only in the constructive execution of the device.

In FIG. 1 is a schematic view of a gas analysis device according to the invention; FIG. 2 and 3 - photocell switching schemes.

The device is driven by an air loopback vacuum pump 4, which receives water from a pressure tank 6 mounted in the instrument box. The pressure tank 6 has a tube 8 for the tap water to enter it and a safety drain tube 7. The pump 4 continuously pumps air from the vessel 2 through the tube 5. When the valves 16 and 7S are closed, a vacuum is created in the vessel 2, causing water to rise from vessels 1 and 3 communicating with it.

The water level in vessels 1 and 5 decreases. At the same time, a float pane 22 floating on the surface is placed in the vessel /. The pen, when picked up, writes on paper put on the drum 25, straight line. The drum 25 is driven (set in motion by a clock mechanism, or by Waren's motor with a transmission at a small number of revolutions.

Lowering the water level in the vessel 5 causes air to flow through the tube 9 from the reaction vessel 10, into which the absorption solution and which is capable of changing color is poured.

Due to the vacuum formed in the reaction vessel, the test gas is sucked into it through the tube 30. The gas is bubbled through the reagent, which binds the determinate component of the gas mixture.

In order for the instrument to analyze the gas without delay and to avoid air entering the gas duct through the JO vessel and valve 18, when the latter is open, the gas is continuously sucked into the device by a small loopback water jet pump 34.

The rise of the water in the vessel 2 continues until saturation of the reagent poured into the reaction vessel and the change at this point in the color of the solution. The photocell 12 that is included in the rectifier and amplifier circuit (Figs. 2, 3) responds to this change in solution color and through the relay 35 using the electromagnetic relay 17 and 19 attracts valves 16 and / 5 (Fig. 1) and opens them.

Depending on whether the color change in the solution leads to switching the current in the photocell circuit on or off, the electrical circuit of the device changes somewhat. In the case when a reaction is selected that causes the photocurrent to turn on, the device is mounted according to the circuit shown in FIG. 2. At the time of opening the valves 16 and / 5, the electromagnet of the relay 27 switches off, which releases the spring 28, which opens the photocell circuit in contact 29.

Through the valve 16 and the adjusting valve 3 / into the vessel 2, air is sucked from the atmosphere and partially from the vessel 14. A small vacuum is created in this vessel, sucking the liquid from the reaction vessel 10 through the siphon 13, emptying it.

Water from vessel 2 flows back into vessels 1 and 3. Float 22, and with it, the feather returns to its original place. When the water level closes from below the bell 21, the air from it passes into the flask 20, which, due to this, through the siphon dispenses the titrated reagent, which is poured through the valve / S into the reaction vessel. When the levels in the communicating vessels 1, 2 and 3 are equalized, the counterweight 2o of the float is lowered onto the spring 28, which includes in contact 29 a photocell circuit. Ego causes the inclusion of an electromagnet 27, holding the spring 28 at the contact 29, as well as the switching off of the electromagnets / 7 and 19.

The valves 16 and 18 under the action of their own gravity are lowered, closing the valves. The cycle of the machine repeats.

The electrical circuit of the instrument, in which the end of the titration of the solution is due to its clarification, is shown in FIG. 3. It is characterized by the fact that the electromagnets 17, 19 and 27 are turned on by closing the circuit with the photocell 12 when it is illuminated. The electromagnet 27 thus moves the spring 39 from contact 58 to contact 37. This turns off the photocell and the current in the circuit passes through resistance 43, which is close in magnitude to the resistance of the photocell. In this case, the electromagnet 40 attracts the spring 42, disconnecting it from the contact 41 and disconnecting this photocell from the relay 35.

After a new portion of the colored solution is poured into the reaction vessel, the electrical system is brought to its initial position by a load 23, which opens the circuit with a spring 28 at the contact 29.

Opening the circuit B leads to the lowering of the springs 39 and 42, and consequently, the current off in the circuit A.

In the case when the content of the detected gas in the analyzed mixture is less than a predetermined limit, and consequently, there is no change in the color of the solution in the vessel 10, switching of the primary circuit A is performed by lifting the weight 26 that reaches the upper limit, which deflects the spring 33 upwards. Moreover, in the circuit of FIG. 2, the spring 55 opens the circuit in the contact 32, and in the circuit of FIG. 3 closes the circuit in the same contact.

This action of the spring 55 is quite similar to the action of a photocell. During normal operation of the device.

The device diagram has a direct scale, despite the fact that the amount of gas being sucked in- progressively increases with a decrease in the percentage of the gas to be detected. This is achieved by a special form of vessels 2 and 3, specially calculated from the limits of the concentration of the analyzed gas and from the volume and concentration of the reagent poured into the vessel 10.

The device operates under vacuum under slight pressure. With considerable pressure, the latter decreases in front of the device by a pressure reducing valve.

The subject matter of the invention.

Claims (4)

1. Device for automatic analysis of gases by passing the test gas through the titrated solution and registering the color change of the solution by means of a photocell, characterized in that interconnected vessels I, 2, 3 are used for automatic suction of the test gas through the titrated solution in the reaction vessel. of which the vessel 2 is connected to the air pump 4 and is provided with a valve 16 communicating with the atmosphere, driven by a photocell / 2 relay 17 is activated, one of the liquid-filled vessels 1, 3 is connected to the reaction vessel 10 by a tube 9, and a float 22 is placed in the other to control the registration of the volume passed through the titrated solution on paper 25 gas. 2. The form of the apparatus according to claim 1, characterized in that for automatically feeding the titrated solution from the flask 20 into the reaction vessel 10, the vessel / is equipped with the air bell 21 lowered into it with the bell of the flask 20 and the tube The feed solution into the reaction vessel from flask 20 is equipped with a valve 18 actuated by the relay 19 included in the photocell circuit 12. 3. In the device according to claims. 1 and 2, the use of a relay 27 intended to open the photocell circuit after the operation of the relays 17, 19. 4. In the device according to claims. 1-3, the counterweight 25 associated with the float 22 is designed to control the insertion of the photocell 12 into the current circuit at the beginning of the next cycle of operation of the device. copyright (M.M. Kovanko's testimony and N. Ya. Ugn cheva No. 55158 Fit / Figg 12 J5 / 7 19