US1475000A

US1475000A - Gas-analyzing apparatus

Info

Publication number: US1475000A
Application number: US603982A
Authority: US
Inventors: Robert E Cooper; Charles O Sisler
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-11-29
Filing date: 1922-11-29
Publication date: 1923-11-20
Anticipated expiration: 1940-11-20

Description

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R. E. COOPER ET AL GAS ANALYZING APPARATUS Filed Nov. 29

Nov. 20, 1923.

atented Nov. 20, i923.

ROBERT E. COOPER AND CHARLES O. SISLER, 0F SAULT STE. MARIE/ONTARIO, CANADA.

GAS-ANALYZING APPARATUS.

Application filed November 29, 1922. Serial No. ($3,982.

T 0 all whom it may concern.

Be it known that we, ROBERT E. Coornn and CHARLES O. SIsLER, both of the city of Sault St. Marie, in the Province of Ontario, Canada, citizens of the United States of America, have invented certain new and useful Improvements in Gas-Analyzing Apparatus, of which the following is a specification.

Thisinvention relates to means for determining from time to time, or continuously, the proportion of a given gas in a mixture of gasses such as pass off heating, roasting reducing furnaces and the like, and my object is to devise apparatus for obtaining such determinations electrically so that indicating, recording or alarm apparatus may be readily actuated and at a distant point if desired.

\Ve attain our object by withdrawing from a conduit in which the mixed gasses are flowing a certain proportion of the mixture, preferably continuously and by the siphon action of water or other liquid capable of dissolving the gas the proportion of which it is desired to determine. The gases and liquid are intermingled and the liquid takes up the soluble gas and the electrical conductivity of the liquid is thus changed. The solution passes into an electrolytic cell in which a constant level is maintained and in connection with which there is provided means for determinin the changes in the electrical conductivity 0 the solution as and when they occur. Such changes form a measure of the proportion of the specific gas in the mixture. These changes in conductivity in a circuit in which a current is flowing are employed to actuate suitable indicating, recording or alarm mechanism.

The invention is hereinafter more specifically described and is illustrated in the accompanying drawing which is a diagrammatic view of the apparatus.

In the drawing 1 is a conduit through which a mixture of gases is passing. From this conduit a pipe 2 leads to an aspirator 3 of ordinary type. To this aspirator leads a water pipe 4, which is preferably connected with a constant level tank wherebya constant pressure of water is obtained when the apparatus is in operation. The tank is provided with a supply pipe 6, which, when the apparatus is in use, would be connected with a constant source of water supply. A control valve 7 is preferably provided in the water supply pipe. The constant level in the tank is maintained through the medium of an overflow, which is preferably a pipe 8 communicating with the interior of the tank below its rim.

The water pipe leading to the aspirator is preferably provided with a control valve 9, and the gas supply pipe is preferably provided with a pressure gauge such as the manometer 10 whereby the gas pressure can be observed. A discharge pipe 11 from the aspirator leads to an electrolytic cell 12, which is provided with an overflow such as the pipe 13 whereby a constant level may be maintained in the cell.

Electrodes 14 are suitably supported from the cover of the cell at a suitable distance apart. From the construction described it follows that as long as there is a flow of gas in the conduit 1, a definite proportion of the gas flowing may be drawn off by the action of the aspirator and intimately mixed, while passing through the aspirator and the discharge pipe, with the water so that the soluble constituents of the gas mixture are absorbed by the water which ultimately reaches the electrolytic cell.

The electrodes of the cell are connected in an electric circuit 15, which includes a suitable source of supply of electric energy, and also suitable means, actuated by variations in the current flowing, to indicate or record such variations or to cause them to sound an alarm.

The energy supplied to the circuit is constant, but as the conductivity of the electrolyte in the cell 12 varies according to the proportion of gas which is held in solution therein, the current flowing in the circuit will vary as the conductivity of the electrolyte varies. We indicate a millimeter 16 in the circuit 15, the pointer of which will give a measure at any time of the conductivity of the electrolyte and therefore of the quantity or proportion of soluble gas in the lectrolyte.

We do not desire to confine ourselves to the specific arrangement shown, as variations in the conductivity of the electrolyte are readily ascertained by such devices, as, for example, a Wheatstone bridge.

Once having obtained a circuit 'n which the current'flowing varies in proportion to the s dissolved in the electrolyte, it is analyzed may be substituted for the water.

What we claim as our invention is 1. Gas analyzing apparatus comprising means for continuously withdrawing at a constant rate a small portion of gas from a gas mixture from a conduit in which said mixture is flowing and bringing it into intimate contact with a liquid supplied at a constant rate and at a constant ratio relative to the gas and capable of absorbing one of the components of the gas mixture; an electrolytic cell into which the sampling means discharges and which is provided with an overflow; and means for continuously determining the changes which take place in the electric conductivity of the liquid in the cell.

2. Gas analyzing apparatus comprising an aspirator; a gas supply pipe to said'aspirator; a water supply pipe to said aspirator; a discharge ipe from said aspirator; an electrolytic ce 1 to which said discharge pipe leads and which is provided with an overflow; and means for continuously determining the changes which take place in the electric conductivity of the liquid in the cell.

3. Gas analyzing apparatus comprising an aspirator; a gas supply pipe to said aspirator; a pressure gauge in said pipe; a water supply pipe to said aspirator; a discharge pipe from said aspirator; an electrol tic cell to which said'discharge pipe lea s and which is provided with an overflowyand means for continuously determining the changes which take place in the electric conductivit of the liquid in the cell.

4. Gas analyzing apparatus comprising anaspirato-r; a gas supply pipe to said aspirator; a water supply pipe to said aspirator; a constant level water tank to which said supply pipe is connected; a discharge pipe from said aspirator; an electrolytic cell to which said discharge pipe leads and which is provided with an overflow; and means for continuously determining the changes which take place 'in the electric conductivity of the liquid in the cell.

5. Gas analyzing apparatus comprising an aspirator; a gas supply pipe to said aspirator; a pressure gauge in said pipe; 21 Water supply pipe to said aspirator; a constant level water tank to which said supply pipe is connected; a discharge pipe from said aspirator; an electrolytic cell to which said discharge pipe leads and which is provided with an overflow; and means for continuously determining the changes which take place in the electric conductivity of the liquid in the cell.

Signed at Sault Ste. Marie, Ont., Canada this 13th day of Nov., 1922.

ROBERT E. COOPER. CHARLES O. SI'SLER.