US1993023A - Electric transmitter for gas analyzers - Google Patents

Description

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' March 5, 1935. A F sPlTzcsLAss ELECTRIC TRANSMITTER FOR GAS ANALYZERS Filed Sept. 26, 1927 March 5, 1935. SPITZGLASS 1,993,023

ELECTRIC TRANSMITTER FOR GAS ANALYZERS Filed Sept. 26, 1927 Sheets-Sheet, 2

March 5, 1935, A HTZGLASS 1,993,023

ELECTRIC TRANSMITTER FOR GAS ANALYZERS March 5, 1935. A. F. srrzsLAs 1,993,023

ELECTRIC TRANSMITTER FOR GAS ANALYZERS Filed Sept. 26, 192'? 4 Sheets-Sheet efrrve r7 Fm" Patented Mar. 5, 1935 UNITED STATES Emo'rmc TRANSLHTTER FOB GAS ANALYZEBS Albei-t F. Spitzglass, Chicago, 111., assignor to Republic'Flow Meters 00., Chicago, 111., a corporation of Illinois Application September 26, 1927, SerialNo. 222,185

7 Claims.

This invention relates to means for registering electrically the results obtained by, gas analyzers, and has for one of its objects the provision of means for producing variations in an electric circuit commensurate with the percentages indicated by the analyzer to which the invention is applied.

' A further object is to provide a device of the class named which shall be of improved construction and operation.

Other objects and advantages will appear from the following description.

The invention is exemplified in the combination and arrangement of parts shown in the accompanying drawings and described in the following specification, and it is more particularly pointed out in the appended claims.

In the drawings- Fig. l is a vertical sectional view of a power driven gas analyzer showing one embodiment of the present invention applied thereto; I

Fig. 2 is a top plan view of the mechanism shown in Fig. 1; I

Fig. 3 is a perspective view, with parts broken away and parts in section, showing the apparatus comprising the present invention;

Fig. 41s a wiring diagram showing the mannet of connecting a CO2 recorderto an indicating instrument; and a Fig. 5 is an electrical diagram showing the manner of connecting the recorder to indicating, recording and integrating instruments.

The invention is illustrated as applied to the form of gas analyzer shown and claimed in the application of Arthur B. Cunningham, Serial No. 116,777, filed June 18, 1926.

The gas analyzer comprises a caustic potash 'tank -having a housing 11 mounted thereon which is partially filled with a light oil 12. A motor 13 is mounted on the tank 10 which drives a pump 14 within the tank by means of a shaft 15 extending through a packing gland 16. The pump 14 is connected .by piping 17 with a source of gas to be analyzed, such as the smoke-stack of a power plant. The gas is pumped fromthe piping 17 through a tube 18 and pipe connection 19 and discharged through an opening 20 which is open to atmosphere. This produces a continuous stream of gas to be analyzed, from which samples are periodically drawn.. A pumping device comprising a cylinder 21 is operated by means of a connecting rod 22 to withdraw periodicalLv the measured quantities of gas from the pipe 19 and to discharge the measured gas through a pipe 23 into the caustic potash tank 10 beneath a baille 24. The gas passes through the chamber 10 and the carbon dioxide therein is absorbed in the caustic potash solution. The remaining portion of the gas passes upwardly into a chamber 25 andthrough a pipe 26 into an inverted bell 27 arranged in a chamber 28. The gas escapes at the top of the pipe 26 into the bell 27 which is immersed in liquid in the chamber 28. As the gas displaces the liquid in the bell 27, the bell will rise and the height to which it rises'will depend upon the amount of gas remaining after the carbon dioxide has been absorbed from the charge. The height to which the 'bell 27 rises will be inversely proportional to the percentage of carbon dioxide in the sample taken. After the bell has been given opportunity to reach its highest position the chamber 25 is opened to atmosphere through a pipe 29 having a seal 30 controlled by the movement of the cylinder 21. When the pipe 29. is open to atmosphere, the gas will be discharged from the bell 27 and the bell will return to its initial lowered position ready for a new charge.

The connecting rod 22 is operated by acrank 31 mounted on a shaft 32 which is connected through reduction gearing to the shaft 33. The shaft 33 inturn is driven bya gear 34 and pinion 35 connected with the shaft 15. A cam 36 is secured to wardly extending pin 44 carried by a. contactor arm 45. The contactor arm 45 is mounted on a spindle 46 journaled in bearings 47 and 48. The bearings 47 and 48 are carried in a bearing block 49 which is supported on a base plate or platform 50. A spring 51 is secured to the arm 45 and tends to rotate the arm in a clockwise direction, as viewed from the'top, to hold the pin 44 against the arm 43.

A resistance element 52 is mounted on the base plate and is provided with resistance windings which are engaged by a contactor shoe 53 carried by the arm 45. The arm 45 is provided with a spring portion 54 which tends to lift the shoe 53 from engagement with the windings of the resistor element 52 but which permits the shoe to be moved in, engagement with the windings by means of a depressor bar 55. The depressor bar 55 is pivotally mounted at 56 and is provided with an adjustable contact pin 57. disposed above the upper end of the bar 37. A lever 58 is pivoted at 59 and has one end interposed between the upper end of the bar 37 and the contact pin 57. The other end of the lever 58 carries a mercury switch 60 which normally completes the circuit between conductors 61 and 62. A spring 63 normally holds theleft-hand end of the lever 58 in its upper position to close the connection between the conductors 61 and 62. The conductor 61 may be connected to a suitable binding post 64 and the conductor 62 is connected through the resistance element 52 and the contact arm to a binding post 65. A suitable registering instrument is connected to the binding posts 64 and 65 and may be placed at any convenient position to register the variations in the-electrical circuit including the resistance element 52. The electric circuit will, of course, be provided with a suitable source of electromotive force.

In operation, the charge of gas is first permitted to accumulate in the chamber 25 and pass upwardly into the bell 27, raising the bell until it reaches its uppermost position or until the arm contactor arm 45. If the bell 27 has been ar-.

rested in its upward movement by the pin 44, the bell will now raise to its uppermost'position and swing the contactor 53 in a counterclockwise direction. If, however, the bell 27 has already moved to its uppermost position without bringing the arm 43 into engagement with the pin 44 immediately upon release of the depressor 55, the spring 51 will swing the arm 45 in a clockwise direction until it is arrested by the arm 43. It will thus appear that the position of the contactor shoe 53 will be determined by the height of the bell 27 and that the higher the bell rises, the

. greater will be the resistance included in the circuit. After the pin 44 has had time to be positioned by the arm 43 the rod 37 will again move downwardly and will first release the depressor 55 to engage the arm 45 and move the contactor shoe 53 into connection with the resistance element 52. Further downward movement of the rod 37 will permit the spring 63 to raise'the mercoid switch and connect the terminals 61 and 62, thus completing the circuit through the resistance element. It should be noted that the switch 60 breaks the circuit before the movement of the contactor .arm 45 begins and restores the circuit after the movement of the contactor arm 45 is completed. This prevents possibility of sparking when the circuit is broken by movement of the contactor am. It will be seen that theconductivity of the circuit will depend upon the height to which the bell 27 is raised so that the instrument connected with the circuit may be calibrated to register directly the percentage of carbon dioxide in the'samples of gas analyzed.

Figs. 4 and 5 show diagrammatically the manner of connecting the CO: recorder with balanced registering instruments so that continuous registration is produced. If the CO: recorder were connected in circuit with an indicating instru ment which operates'against gravity or the force 'of a spring, it is apparent that each time the and 5 and by the use of registering instruments which are balanced to remain in any set position when the current is discontinued, it is possible to secure a continuous reading.

In Fig. 4, the numeral 66 represents an armature of a solenoid supported by -a balanced lever 67 to which the instrument pointer 68 is attached. The armature 66 is surrounded by two coils 69 and 70. The coil 69 offers opposition to movement of the armature under influence of the coil 70 so that if constant current is maintained in the coil 69', the amount of movement in the armature and consequently of the pointer 68 will be a function of the current in the coil 70. The parts are perfectly balancedagainst the action of gravity for all positions so that if the current is discontinued in both coils, the pointer 68.will

maintain the position to which it has been moved because of the inertia of the parts and frictional resistance. An instrument of this kind is more completely described and claimed in the patentof Ernest H. Freeman, 1,768,552, dated July 1,

Current is supplied to the coils 69 and 70 from. a transformer 71 or other source of potential. A circuit 72 for the coil 69 passes through the switch 60 previously described in connection with Fig. 3. So long as the switch 60 is closed, the coil 69 will be connected with a constant source of potential.

The coil 70 is connected by means of the circuit 73 to the resistance 52, contact arm 54, and switch 60, all previously described. In this way the switch 60 is made to open the' circuit to both coils 69 and 70 so that during the time the contact arm 54 is being moved the break in the instrument circuit 73 will not produce a movement of the indicator 68, because at the same time the circuit 72 will be opened and the armature 66 will therefore be-relieved of all force acting thereon. As previously pointed out, it is desirable to lift the movable arm 54 free from the resistance 52 during adjustment of the arm, because of the fact that the available force for moving the arm is small and free movement is desirable to produce accurate measurements.

Fig. 5 is a view similar to Fig. 4 showing the CO: recorder connected with the indicating instrument 74 which may be similar to the instrument shown in Fig. 4 and also connected to a recording instrument 75 similar to that shown in the application referred to above. 76 is an integrating instrument which may be of any wellknown form having a current and a potential coil and free moving armature, the heavy lines indicating the current circuit and the light lines indicate the potential circuit of the instrument. When the current is cut oft from both circuits the moving parts will continue to move at sublaterally extending arm'thereon, an arm having a stop thereon for engaging the arm on said helical bar for the different positions of said helical bar,

means for pivotally mounting said arm and a spring for moving said pivoted arm to bring the stop thereon into contact with the arm on said helical bar.

2. In a measuring instrument, a member responsive to aquantity to be measured, a helical element provided with an arm and operated by said member, a guide for imparting rotation to said element when moved by said'member, a pivoted arm mounted on an axis co-incident with the axis oi said helical element and having a flnger cooperating with the arm on said element for operation thereby and means urging said flnger in contact with said am. I

3. In a measuring instrument, the combination with an arm adapted for normal motion in a plane and for periodic deflection out .0! said plane, a member having a straight line movement transversely of said plane in response to a quantity to be measured, means for imparting rotation to said member cte with its straight line movement and a movable connection between said arm and member ior transmitting the rotary movement to said arm for deflecting the same in accordance with variationsin the quantity to be measured.

.4. A measuring instrument, having in combination, a pivoted arm adapted for normal motion 1 in a plane and for momentary deflection out 0! 'the projecting portion of said arm and means portion intocontact with ursi s said p i t s said finger.

5. A measuring instrument, having in combination, an arm adapted for normal motion ins plane and for momentary deflections out oi! said plane, a pin carried by said arm, a helical mem-. ber responsive to a quantity to be measured having a straight line movement transversely of the plane of movement of said arm, a flnger carried by said member for coaction with said pin, means for urging said pin into contact with said flnger, a guide coacting with said member-"tor imparting rotary movement thereto in accordance with its straight line movement and means for adjusting said guide for varying the position of said arm.

6. In a measuring instrument, the combination with an arm adapted for normal motion in a plane, a member responsive to a quantity to be measured and having a straight line movement perpendicular to the plane of movement of the arm, connecting means between said member and arm and means tor imparting rotary motion to said member commensurate with its straight line movement.

'i. In a measuring instrument, a rheostat, a contact member for adjusting said rheostat but normally out of contact therewith, said contact member adapted to move while out of engagement with said rheostat, a depressor for moving said contact member into ent with said rheostat, a bell float whose position is to be registered by the measuring instrument, means attached to said bell float for transmitting the motion of the bell float to said contact member in one direction, and a spring for urging said contact member into operative engagement with said means.

ALBERT I". BPI'IZGLABB.

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