CA1180384A - Oxygen gas analyzer using solid electrolyte - Google Patents
Oxygen gas analyzer using solid electrolyteInfo
- Publication number
- CA1180384A CA1180384A CA000397396A CA397396A CA1180384A CA 1180384 A CA1180384 A CA 1180384A CA 000397396 A CA000397396 A CA 000397396A CA 397396 A CA397396 A CA 397396A CA 1180384 A CA1180384 A CA 1180384A
- Authority
- CA
- Canada
- Prior art keywords
- probe
- solid electrolyte
- oxygen analyzer
- wall
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4075—Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts
- G01N27/4076—Reference electrodes or reference mixtures
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An oxygen analyzer for measuring the oxygen concentration in a measured gas, having a probe type detecting section carrying at its end a solid electrolyte constituting a partition wall, so as to produce a signal corresponding to the difference in the oxygen concentration between the inner side and the outer side of the partition wall is described. The outer side of the electrolyte is adapted to be exposed to the flow of the gas to be measured or into a furnace through a hole formed in the furnace wall and the inner side of the electrolyte is exposed to flow of reference air, thereby to continuously produce a signal representing the oxygen concen-tration in the gas being analyzed. The flow of reference air is achieved without a pump by dividing the hollow probe into two sections using a longitudinal partition. The two sections commnunicate with each other near the electrolyte and respectively communicate with atmosphere remote from the electrolyte. because of temperature differences a natural convection current is established causing air to flow from atmosphere consecutively through the two sections and back to atmosphere.
An oxygen analyzer for measuring the oxygen concentration in a measured gas, having a probe type detecting section carrying at its end a solid electrolyte constituting a partition wall, so as to produce a signal corresponding to the difference in the oxygen concentration between the inner side and the outer side of the partition wall is described. The outer side of the electrolyte is adapted to be exposed to the flow of the gas to be measured or into a furnace through a hole formed in the furnace wall and the inner side of the electrolyte is exposed to flow of reference air, thereby to continuously produce a signal representing the oxygen concen-tration in the gas being analyzed. The flow of reference air is achieved without a pump by dividing the hollow probe into two sections using a longitudinal partition. The two sections commnunicate with each other near the electrolyte and respectively communicate with atmosphere remote from the electrolyte. because of temperature differences a natural convection current is established causing air to flow from atmosphere consecutively through the two sections and back to atmosphere.
Description
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The present invention relates to an oxygen gas analyzer and, more particularly, to an oxygen analyzer having a probe type detector adapted to produce a sîgnal represen~ing the difference in oxygen concentration between the inner side ancl the outer side of a partition wall Eormed by a solid electrolyte supported on the end of the probe type detector.
In order to describe the prior art reference is hereby made to Figures 1 and 2 of the accompanying drawings, in which:
Figure 1 is an illustratîon of the construction of a conventional oxygen analyzer;
lQ Figure 2 is a longitudinal section to an enlarged scale showing the construction of the detecting section of the conventional oxygen analyzer;
Figure 3 is a sectional view illustrating the construction of a probe type detecting sectîon of a solîd electrolyte type oxygen analyzer constructed în accordance with the inventîon;
Figure 4A and Figure 4B are enlarged sectîonal views of portions of the probe type detecting sectîon shown în Figure 3;
Figure 5, appearing on the same drawing sheet as Figure 3, is a vîew similar to Figure 3 but showîng another embodiment of the invention;
Figure 6 is an enlarged view of an important part of the detecting
The present invention relates to an oxygen gas analyzer and, more particularly, to an oxygen analyzer having a probe type detector adapted to produce a sîgnal represen~ing the difference in oxygen concentration between the inner side ancl the outer side of a partition wall Eormed by a solid electrolyte supported on the end of the probe type detector.
In order to describe the prior art reference is hereby made to Figures 1 and 2 of the accompanying drawings, in which:
Figure 1 is an illustratîon of the construction of a conventional oxygen analyzer;
lQ Figure 2 is a longitudinal section to an enlarged scale showing the construction of the detecting section of the conventional oxygen analyzer;
Figure 3 is a sectional view illustrating the construction of a probe type detecting sectîon of a solîd electrolyte type oxygen analyzer constructed în accordance with the inventîon;
Figure 4A and Figure 4B are enlarged sectîonal views of portions of the probe type detecting sectîon shown în Figure 3;
Figure 5, appearing on the same drawing sheet as Figure 3, is a vîew similar to Figure 3 but showîng another embodiment of the invention;
Figure 6 is an enlarged view of an important part of the detecting
2~ section shown in Figure 5;
Figure 7 is a view similar to Figure 3 but to a smaller scale and showing still another embodiment of the invention;
Figure 8A is an enlarged sectional view taken along tbe line Xl-X
of Figure 7;
Figure 8B îs a view sîmilar to Figure 8A but showing the arrange-ment of various lead wires;
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Figure 9 is a graph illustrating the principle of operation of the oxygen analyzer shown in Figure 7;
~ igure 10 is a fragmentary sectional view illustrating a further embodiment of the invention; and Figure 11 is a view sîmilar to Figure 10 but illustrating a still further embodiment of the in~ention.
Figure 1 shows a typical known oxygen analyzer of the direct insertion type. This oxygen analyzer has a probe 1 having an end adapted to be inserted înto a stack or a furnace with a flange 2 of the probe la fastened to the furnace wall 5 by means of bolts 3~ The probe 1 is provided at its end with a solid electrolyte such as zirconia, bismuth oxide or the like, detecting electrodes disposed across the solid electrolyte, a temperature sensor, a heater and so forth as described in more detail below.
The oxygen analyzer also has a terminal box 4 through which the detecting electrodes, temperature sensor and the heater are connected to external circuits. ~he oxygen analyzer also has a signal receiving portion 7 adapted to output a signal corresponding to the oxygen concentration. The signal receiving portion 7 has a linearizing section for linearizing the detection signal and a temperature adjusting section employing the heater as the control means. The oxygen analyzer is providecl also with a pump 6 adapted to forcibly supply air as a reference gas into the probe 1.
Thus, the conventional oxygen analyzer requires a pump for supplying the probe 1 with a reference gas Cair2, so that the cost of the production is raised. In addition, the reliability of operation is lowered due to the employment of moving parts such as pump.
As an alternative, such an oxygen analyzer has been proposed as adapted to introduce instrumentation air into the probe 1. This system,
Figure 7 is a view similar to Figure 3 but to a smaller scale and showing still another embodiment of the invention;
Figure 8A is an enlarged sectional view taken along tbe line Xl-X
of Figure 7;
Figure 8B îs a view sîmilar to Figure 8A but showing the arrange-ment of various lead wires;
.~
Figure 9 is a graph illustrating the principle of operation of the oxygen analyzer shown in Figure 7;
~ igure 10 is a fragmentary sectional view illustrating a further embodiment of the invention; and Figure 11 is a view sîmilar to Figure 10 but illustrating a still further embodiment of the in~ention.
Figure 1 shows a typical known oxygen analyzer of the direct insertion type. This oxygen analyzer has a probe 1 having an end adapted to be inserted înto a stack or a furnace with a flange 2 of the probe la fastened to the furnace wall 5 by means of bolts 3~ The probe 1 is provided at its end with a solid electrolyte such as zirconia, bismuth oxide or the like, detecting electrodes disposed across the solid electrolyte, a temperature sensor, a heater and so forth as described in more detail below.
The oxygen analyzer also has a terminal box 4 through which the detecting electrodes, temperature sensor and the heater are connected to external circuits. ~he oxygen analyzer also has a signal receiving portion 7 adapted to output a signal corresponding to the oxygen concentration. The signal receiving portion 7 has a linearizing section for linearizing the detection signal and a temperature adjusting section employing the heater as the control means. The oxygen analyzer is providecl also with a pump 6 adapted to forcibly supply air as a reference gas into the probe 1.
Thus, the conventional oxygen analyzer requires a pump for supplying the probe 1 with a reference gas Cair2, so that the cost of the production is raised. In addition, the reliability of operation is lowered due to the employment of moving parts such as pump.
As an alternative, such an oxygen analyzer has been proposed as adapted to introduce instrumentation air into the probe 1. This system,
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however, requires special piping and, therefore, is not preferred from an economical poînt of view.
Figure 2 illustrates the construction oE the detecting section of the conventional oxygen analyzer of the kind described. ReEerence numeral 8 designates a test-tu~e type solid electrolyte such as of zirconia, bismuth o~ide or the like material. A barrier lA extends across the interior oE
probe 1 and the solid electrolyte 8 is securecl to and extends through the barrier lA with its closed end located at the end of the probe 1 so as to form a partition wall separa~ing the end portion of the probe 1 from other portions of the same. Electrodes 9 and ln are closely secured to the inner and outer sides of the wall of the solid electrolyte 8. A temperature sensor 11 is adapted to sense the temperature of the solid electrolyte 8 which is adapted to be heated by a heater 12. The temperature sensor 11, heater 12 and the temperature adjusting section Cnot shown) in combination constitute a temperature control system adapted to maintain the solid electrolyte at a constant temperature. In operation, a signal corresponding to the difference of oxygen concentration between the inner side and outer side of the solid electrolyte 8 is derived from the electrodes 9 and 10 through respective leads which are not shown. A reference numeral 13 designates a ~ilter 2Q adapted to prevent dust from attaching to the wall surface of the solid solution 8, while a reference numeral 14 denotes a conduit passing through barrier lA and having one end located at the closed end (outer side) of the solid electrolyte 8 and the other end extending out of the other end of the probe 1 so as to be able to introduce a calibration gas into the closed end of the solid electrolyte 8.
In this type of oxygen analyzer, it is necessary to occasionally renew the solid electrolyte 8 in order to maintain the desired precision of measurement. The work required for this renewal, however, is made quite q3~
troublesome and -time-consuming, because the probe 1 is provided with various small parts a-t its end as described.
Accordingly, an object of the invention is to provide a solid electrolyte type oxygen analyzer having a cell unit which does not have lead wires and permits an easy renewal of the solid electrolyte in the probe type detector.
To this end, according to the invention, there is pro-vided a solid electrolyte type oxygen analyzer having a probe type detecting section including a solid electrolyte fixed to the end thereof so as to form a partition wall and adapted to produce a signal corresponding to the difference in -the oxygen concentration between the inner side and outer side of said partition wall, said oxygen analyzer comprising: a contact portion secured to the inner wall surface of said probe near the end of the lat-ter through an electrically insulating member; a test tube type solid electrolyte inserted into and fixed to said end of said probe, said solid electrolyte having a first electrode and a second elec-trode which are closely secured to the outer wall surface and the inner wall surface of the closed end wall of said solid electro-lyte or the portion of said solid electrolyte near said end wall,a first lead closely attached to said outer wall surface of said solid electrolyte and providing a connection between said first electrode and said contact portion, and a second lead closely at-tached to said inner wall surface of said solid electrolyte and providing an electric connection between said second electrode and the open end surface of said solid electrolyte; and a first conductor and a second conductor connected to said contact portion 33~4~
and said open end o:E said solid electrolyte, respectively, thereby to transmit the signals produced by said first and second elec-trodes.
Another object of the invention is to provide a solid electrolyte type oxygen analyzer in which, in order to facilitate the renewal of the solid electrolyte, a cell unit consisting oE
a test tube type electrolyte and a flange integral therewith is inserted with its closed end directed inwardly in-to the end of the probe and a calibration gas conduit is easily separable from the body of the oxygen analyzer.
This object of -the invention is achieved by a solid electrolyte type oxygen analyzer comprising: a cell uni-t includ-ing a conduit disposed in a probe such that one end of the conduit is disposed near the end of the -4a-, probe while the other end proiects toward the portion of the probe opposite to the end, a test tube type solid electrolyte and a flange integral wi~h the solid electrolyte, the cell unit being inserted into and secured to the probe with the closed end of the solid electrolyte directed înwardly, a substan-tially U-shaped plpe havlng one end inserted into the lnternal cavity of the solid electrolyte ~hile the other end being connected to the portion of the condult near the end of the probe, and a flange supporting the U-shaped plpe andj~inted to the flange of the cell unit, the flange being adapted to be fixed to the end of the probe by means of a fixing tool.
Stlll another object of the inventlon ls to provlde an oxygen analyzer havlng a less-expensive and reliable means for introducing a reference gas.
This object is achieved by an oxygen analyzer having a det~ction probe having an internal cavity houslng a solid electrolyte dlsposed proximate one end of the probe, characterized by a partîtlon plate which divides the internal cavity of said probe in the longitudinal direction into two sections, a communicating portion defined at a portion near said solid electrolyte and providing a communication between said sections separated from each other by said partition plate, and a communicating portion providing a communication 2Q between each of said sections and the atmosphere at the end portion of said probe remote from said solid electrolyte.
The inven-tion will now be described in greater detail with reference to the accompan~ing drawings, particularly Flgures 3-11 thereof.
~ lth reference now to Flgures 3, '~A and 4B, reference numeral 15 designates a probe made of an electrically conductlve material and having a flange 16 welded to the barrel or main body portion thereof. The probe 15 ls secured to the wall 17 of a stack or a furnace by means of the flange 16.
4r ~
Reference numeral 18 designates a cell Imit provided at the end of the probe 15 and consisting of a test-tube type zirconia solid e~ectrolyte 19 and a flange 20. The zirconia electrolyte 19 includes porous platinum electrode films 21 and 22 provided on the outer wall surface and the inner wall surface, respectively, of the closed end of the tube. A lead 23 is also provided, this consisting of a ring-shaped portion 23a formed on the outer wall surface of the solid electrolyte tube by baking a platinum paste and a connecting portion 23b along the outer wall surface through which the ring-shaped portion 23a is connected to the electrode film 21. A lead 24 is also pro-lQ vided, this consisting of a contact surface 24a formed by baking a platinum paste on the open end surface of the zirconia and a connecting portion 24b fnrmed on the inner wall surface and formed by baking a platinum paste and providing an electric connection between the contact surface 24a and the electrode film 22.
Reference numeral 25 denotes a heater for heating the zirconia 19 electrolyte tube. This constitutes, in combination with a temperature sensor (not shown) provided on the closed end of the zirconia tube 19 and a tem-perature controller (not shown~, a temperature control system for maintaining the zirconia 19 at a predetermined constant temperature. Reference numeral 2Q 26 denotes a contact ring provided with a recessed inner peripheral surface, 27 denotes a coil contact adapted to be fitted in the recess of the contact ring 26 and consisting of a nichrome wire or a wire of a heat resistant and anti-oxidation metal~ 28 denotes a highly insulative adhesive such as the material known commercially as Sumiceram, for fixing the contact ring 26 to the probe 15, and 29 denotes a wire lead covered by an insulator 30 and disposed in the probe 15 with one end thereof being connected to the contact ~rade ~1 Q ,k 3~3~3~
ring 26 while the other end is connected to an external terminal (not shown).
The coil contact 27 is held in contact with the ring-shaped portion 23a of the lead 23 wîth the zirconia tube l9 mounted in the probe 15, so that an electric path is fornled by electrode fîlm 21, lead 239 coil contact 27, contact ring 26 and the wire lead 29. Reference numeral 31 designates a mesh fîlter made of stainless steel, 32 denotes a flange and 33 denotes a bolt. rChe mesh filter 31 îs pressed and secured to the open end surface of the zirconia tube 19 by means of flange 32, so that an electric path is formed by the electrode film 22, lead 24, mesh filter 31, flange 20, flange 32 and the probe 15. Reference numeral 34 designates a partition plate extendîng longitudinally of the probe 15 and adapted to divide the internal cavity of the probe 15 other than the portion near the zirconia tube 19 into an upper section and a lower section. Reference numeral 35 denotes a cylindrical, conductive, metallic cap portion or lid provided adjacent the open end of the probe 15 which is remote from the zirconia tube 1~, whîle 36 denotes a wire lead connected to the metal plate cap. The metal cap 35 is open at olle end and is so onstructed as to permit the upper and lower sections of the internal cavity of the probe 15 to communicate with the out~ide independently of each other. This is achieved as can be seen by 2a the cap 35 being positîoned partl~ overlapping the open end portion of probe 15, the closed end of the cap 35 being joined centrally to the end of the partition 34. The metal cap 35 is electrically connected to the probe 15 so that the electric path including the electrode film 22 and the probe 15 is connected to the external terminal ~not shown~ through the wire lead 36.
rn the detecting section of the oxygen analyzer, the end of the probe 15 is held in the stream of the hot flue gas to be analyzed. Typically 3~
the gas temperature is about 200 to 50QC. The flue gas comes into the zirconia through the filter 31 by diffusion and convection to continuously contact the inner surface of the zirconia 19. The gas contacting the outer wall surface of the zirconia 19, i.e. the air in the probe 15, has been heated to a high temperature of about 700 to 800 C by the heat derived from the measurement gas and the heat produced by the heater 25. A natural convection current of air is thereby formed to include, as shown in Figure 3, the atmosphere, lower section of the internal cavity of the probe 15, end of the probe lS Cnear the zîrconia 19~, upper section of the internal cavity lQ of the probe 15 and the atmosphere. Therefore, the reference gas side of the zirconia 19 is always held in contact with fresh air, so that it is possible to obtain stably a detection signal between the two electrode films 21 and 22. The signal is then derived through the wire leads 29 and 30. Figure 3 shows the probe 15 held in a horizontal position but it should be stated that sufficient convection of air is maintained even if the probe 15 is inclined with the end thereof directed downwardly until the probe 15 comes to take a substantially vertical position with the cap 35 at the bottom.
As has been described above, the cell unit 18 is secured to the end of the probe 15 by means of a flange 32 and bolts 33, and the electric connection between the electrode fîlms 21,22 and the external terminals is made through the leads 23,24, coil contact 27 and the mesh filter 31. It is, therefore, possible to easily mount and demount the cell ~Init 18.
Thus, according to the invention, there is provided a solid eLectrolyte type oxygen analyzer having a cell unit which does not have lead wires so that the renewal of the solid e:Lectrolyte can be made easily to reduce the maintenance cost.
P3~
ReEerring now to Figures 5 and ~, reEerence numeral 37 denotes a probe having a flange 38 welded thereto and mounted on a flue or a furnace wall 39 by means of the flange 38. Reference numeral 40 denotes a cell unit con-sisting of a ~est-tube type zirconia solid electrolyte 41 and a flange 42 and adapted to be mounted on the end of the probe 37, while 43 designates a heater for heating the zirconia 41. Although not shown, porous electrode films of platinum are formed on both surfaces of the end (bottom of the test tube2 of the zirconia 41 as in the first described embodiment. A signal corresponding to the difference in the oxygen concentration between the two chambers separated by the wall of the zirconia 41, i.e. between the inner side and the outer side of the probe 37, is taken out of the probe by means of the electrode films as before. ~ temperature sensor (not shown) pro-vided at th~ end of the zirconia 41 constitutes, în combination with a temperature controller Cnot shown~ and a heater 43, a temperature control system which serves to maintain the zirconia at a predetermined constant temperature.
Reference numeral 44 denotes a conduit consisting of a straight portion 44a and a U-shaped portion 44b, 45 denotes a mesh filter provided at the open end of the zîrconia 41 and 46 denotes a flange. The flange 46 2Q supports the U-shaped portion 44b of the conduit 44 through the bracket 47 CFigure 6) and is adapted to be secured to thP probe 37 by means of bolts 48 thereby to fix the cell unit 40 to the end of the probe 37.
In this state, the open end of the U-shaped portion 44b of the conduit 44 is positioned in the hollow cavity of the zirconia 41, while the other end of the U-shaped portion is connected to one end of the straight portion 44a of the conduit 44. Reference numeral 49 denotes a partition D3~
plate which divides the internal cavity of the probe 37 other than the V:iCillity of the zirconia into an upper section and a lower section. A cylindrical lid 50 is constructed and positioned as in the first embodiment to permi-t the upper and lower sections of the internal cavity of the probe 37 to communicate with the atmosphere independently of each other.
In operation, the end portion of the probe 37 is held in the stream of hot (having a temperature of about 200 to 500 C) flue gas to be analyzed and the gas comes into the zirconia 41 through the filter 46 by diffusion and convection, thereby to make continuous contact with the inner wall surface of the zirconia 41. On the other hand, the gas contacting the outer wall surface of the zirconia 41, i.e. the air inside the probe 37, is heated to a high temperature of 700 to 850C by the heat from the flue gas - to be measured and the heat produced by the heater 43. In consequence, a natural convection current of air is formed to include, as shown in Figure 5, the atmosphere, lower section of the internal cavity of the probe 37, end of the probe 37 (near zirconia 41~, upper section of the internal cavity of the probe 37 and the atmosphere.
Therefore, the reference gas side of the zirconia 41 is always kept in contact with fresh air, so ~hat a stable signal is derived from the 2Q electrodes. In the measuring operation stated above, the conduit 44 is normally kept closed so that the gas in the conduit 44 never flows. The presence of the conduit 44, therefore, does not adversely affect at all the state of flow and composition oE the measured gas flowing into the zirconia 37. It is, however, possible to improve the response by making use of the conduit 44. Namely, the introduction of the measured gas into the zirconia 37 is accelerated to promote the substitution of the gas, by connecting one end of the conduit 44 to the SUCtiOII port of an ejector or the like.
3~3~
An explanation will be made as to the calibrating operation and cleaning opera~ion. The calibration is conducted by introducing, through the conduit 44, a calibration gas having a pressure somewhat higher than the pressure of the gas being analyzed into the zirconia 37. Since the calibra-tiOII gas has a pressure higher than the gas being analyzed, the substitution of two gases in the zirconia 37 can be made in quite a smooth manner to permit an accurate substitution of two gases.
By using a cleaning gas, e.g. instrumentation air in place of the calibration gas, it is possible to remove the dust attaching to the filter 46 and the zirconia 37 by blow-back.
For renewing the zirconia 37, the bolts 48 are loosened to sep-arate the straight portion 44a and the U-shaped portion 44b of the conduit 44 from each other, and the cell unit 40 is withdrawn from the end of the probe 37. It is, therefore, possible to renew the zirconia 37 in quite an easy manner.
As has been described, in the solid electrolyte type oxygen analyzer of the invention, the cell unit consisting of a test-tube type solid electro-lyte and a flange integral therewith is inserted into and fixed to the end of the probe with the closed end of the solid electrolyte directed inwardly.
~Q In addition, the conduit for introducing the calibration gas can be separated at a portion thereof near the end of the probe. It will be seen that the described arrangement of the oxygen analyzer remarkably facilitates the protective maintenance work for renewing the solid electrolyte.
Figure 7 shows an oxygen analyzer constructed in accordance with still another embodiment of the invention which achieves the aforesaid third object of the invention. ~he oxygen analyzer of this embodiment includes a ~ ~l8q,~ fl probe 51 having a flange 57 welcled to the barrel thereof and provided with through holes 55 and 56 Eormed in the side wall near the portion 51b thereof opposite to the end, a test-tube type zirconia solid electrolyte 52 mounted on the end of the probe 51, a heater 53 for heating the end (bottom of the test-tube~ of the zirconia 52, a partition plate 54 adapted to divide the internal cavity of the zirconîa 52 into two sections 51d and 51e while leaving a communicating portion 51c in the vicinity of the end of the zir-conia 52 as shown in Figure 8A, a cylindrical lid 59 adapted to close only the end Slb of the probe 51, detect-ing electrodes formed on both surfaces of 1~ the end wall of the zirconia 52, temperature sensor (not shown) for sensing the temperature of the end portion of the zirconia 52, a heater 53, a terminal box 60 for connecting the electrodes, temperature sensor and the heater to external circuits, a linearizing portion (not shown~ for linearizing the detection signal deri~ed through the terminal box 60 and adapted to deliver the linearized signal as its output, and a signal receiving portion (not shown~ consisting of the temperature sensor as the detection end and the heater 53 as the operation end. The probe 51 is adapted to be fixed to the stack or the furnace wall 61 by means of bolts 58 with the end 51a inserted into the flue thereby to measure the oxygen concentration in the ~Q measurement gas.
Although not shown in Figure 7, the wiring to the detecting electrodes, temperatllre sensor and the heater 53 is effected by making use of the partition plate 54 as the substrate, as shown in Figure 8B. Namely, the heater lead ~ire 62 and the electrode leads 63 are placed on the partition plate 54 and are pressed down and fixed by means of a leaf spring 65. ~t the same time, a temperature sensor lead 64 is fixed to the leaf spring 65 by spot welding.
The oxygen analyzer of this embocliment operates as fol:Lows:
In the measuring state, the end 5]a of the probe 51 i9 held in the stream of -the gas to be measured which has a temperature of about 200 to 500 C and one wall surface of the zirconia 52 is held in continuous contact with this stream oE gas. The space inside the probe 51 communiGates with the atmosphere through the through holes 55 and 56 and, therefore, is always filled with fresh air. Therefore, the detection electrodes provided on both surEaces of the wall of the zirconia produce a detection signal in accordance with the Nenlst's equation using the air as the reference gas. The detection signal i8 delivered to the signal receiving portion which conducts a pre-determined arithmetic operation to provide a signal corresponding to the oxygen concentration of the measured gas. The air in the probe 51 is heated to a high temperature of about 700C by the heat derived from the measured gas and the heat produced by the heater 53, so that a natural convection current of air is formed to include the atmosphere, through hole, 55, section 51e, communicating portion 51c, section 51d, through hole 56 and the atmos~
phere, as shown in Figure 7. In consequence, the other wall surface of the zirconia 52 îs maintained in contact with fresh air serving as the reference gas, so that the oxygen analyzer provides a stable output signal.
2a The present inventor has conducted the following test to confirm the presence of the convection current of air.
Atmospheric air was introduced into the area where the gas to be analyzed normally flows so that both sides of the wall of the zirconia 52 were subjected to atmospheric air. The space inside the probe 51 was maintained at a high temperature of about 700C. Then, N2 gas containing about 1% of 2 gas was supplied for 2 to 3 seconds to the area X2 in the q~3~1~
vic:inity of the through hole 55. Figure 9 :i9 a graph showing the change of the detectlon signal. The time To represents the time length over which the 1%
2 gas was blown. As will be understood from Figure q~ the change in the 2 gas concentration appearing at the area X2 is transmitted to the end of the zirconia 52 in about 8 seconds. Since the volume of section 51e in the probe 51 used in the experiment was about 150 ml, the flow rate of air moved by the convection can roughly be calculated to be about 1125 ml/min.
The embodiments heretofore described are not exclusive. For instance, it is possible to employ the communication means as shown in Figures 10 and 11. Namely, in the embodiment shown in Figure 10, the probe 51 is provided with a discharge sleeve 56' connected to the through hole 56 so that the convection in the probe 51 is promoted by the chimney-like action of the discharge sleeve 56'. In contrast, in the embodiment shown in Figure 11, the probe 1 is devoid of the through holes 55 and 56 shown in Figure 7 but, instead, the convection current is formed through the gap between the cylindrical lid 59 and the adjacent end portion 51b of the probe.
As has been described, in the oxygen analy~er of the inven~ion, the internal cavity of the probe is divided into t~o sections by a partition plate and the air is introduced into the cavity divided into two sections, to eliminate the necessity for a pump for supplying the air or piping for introducing instrumentation air, thereby reducing the co~t of production while remarkably improving the reliability of operation.
however, requires special piping and, therefore, is not preferred from an economical poînt of view.
Figure 2 illustrates the construction oE the detecting section of the conventional oxygen analyzer of the kind described. ReEerence numeral 8 designates a test-tu~e type solid electrolyte such as of zirconia, bismuth o~ide or the like material. A barrier lA extends across the interior oE
probe 1 and the solid electrolyte 8 is securecl to and extends through the barrier lA with its closed end located at the end of the probe 1 so as to form a partition wall separa~ing the end portion of the probe 1 from other portions of the same. Electrodes 9 and ln are closely secured to the inner and outer sides of the wall of the solid electrolyte 8. A temperature sensor 11 is adapted to sense the temperature of the solid electrolyte 8 which is adapted to be heated by a heater 12. The temperature sensor 11, heater 12 and the temperature adjusting section Cnot shown) in combination constitute a temperature control system adapted to maintain the solid electrolyte at a constant temperature. In operation, a signal corresponding to the difference of oxygen concentration between the inner side and outer side of the solid electrolyte 8 is derived from the electrodes 9 and 10 through respective leads which are not shown. A reference numeral 13 designates a ~ilter 2Q adapted to prevent dust from attaching to the wall surface of the solid solution 8, while a reference numeral 14 denotes a conduit passing through barrier lA and having one end located at the closed end (outer side) of the solid electrolyte 8 and the other end extending out of the other end of the probe 1 so as to be able to introduce a calibration gas into the closed end of the solid electrolyte 8.
In this type of oxygen analyzer, it is necessary to occasionally renew the solid electrolyte 8 in order to maintain the desired precision of measurement. The work required for this renewal, however, is made quite q3~
troublesome and -time-consuming, because the probe 1 is provided with various small parts a-t its end as described.
Accordingly, an object of the invention is to provide a solid electrolyte type oxygen analyzer having a cell unit which does not have lead wires and permits an easy renewal of the solid electrolyte in the probe type detector.
To this end, according to the invention, there is pro-vided a solid electrolyte type oxygen analyzer having a probe type detecting section including a solid electrolyte fixed to the end thereof so as to form a partition wall and adapted to produce a signal corresponding to the difference in -the oxygen concentration between the inner side and outer side of said partition wall, said oxygen analyzer comprising: a contact portion secured to the inner wall surface of said probe near the end of the lat-ter through an electrically insulating member; a test tube type solid electrolyte inserted into and fixed to said end of said probe, said solid electrolyte having a first electrode and a second elec-trode which are closely secured to the outer wall surface and the inner wall surface of the closed end wall of said solid electro-lyte or the portion of said solid electrolyte near said end wall,a first lead closely attached to said outer wall surface of said solid electrolyte and providing a connection between said first electrode and said contact portion, and a second lead closely at-tached to said inner wall surface of said solid electrolyte and providing an electric connection between said second electrode and the open end surface of said solid electrolyte; and a first conductor and a second conductor connected to said contact portion 33~4~
and said open end o:E said solid electrolyte, respectively, thereby to transmit the signals produced by said first and second elec-trodes.
Another object of the invention is to provide a solid electrolyte type oxygen analyzer in which, in order to facilitate the renewal of the solid electrolyte, a cell unit consisting oE
a test tube type electrolyte and a flange integral therewith is inserted with its closed end directed inwardly in-to the end of the probe and a calibration gas conduit is easily separable from the body of the oxygen analyzer.
This object of -the invention is achieved by a solid electrolyte type oxygen analyzer comprising: a cell uni-t includ-ing a conduit disposed in a probe such that one end of the conduit is disposed near the end of the -4a-, probe while the other end proiects toward the portion of the probe opposite to the end, a test tube type solid electrolyte and a flange integral wi~h the solid electrolyte, the cell unit being inserted into and secured to the probe with the closed end of the solid electrolyte directed înwardly, a substan-tially U-shaped plpe havlng one end inserted into the lnternal cavity of the solid electrolyte ~hile the other end being connected to the portion of the condult near the end of the probe, and a flange supporting the U-shaped plpe andj~inted to the flange of the cell unit, the flange being adapted to be fixed to the end of the probe by means of a fixing tool.
Stlll another object of the inventlon ls to provlde an oxygen analyzer havlng a less-expensive and reliable means for introducing a reference gas.
This object is achieved by an oxygen analyzer having a det~ction probe having an internal cavity houslng a solid electrolyte dlsposed proximate one end of the probe, characterized by a partîtlon plate which divides the internal cavity of said probe in the longitudinal direction into two sections, a communicating portion defined at a portion near said solid electrolyte and providing a communication between said sections separated from each other by said partition plate, and a communicating portion providing a communication 2Q between each of said sections and the atmosphere at the end portion of said probe remote from said solid electrolyte.
The inven-tion will now be described in greater detail with reference to the accompan~ing drawings, particularly Flgures 3-11 thereof.
~ lth reference now to Flgures 3, '~A and 4B, reference numeral 15 designates a probe made of an electrically conductlve material and having a flange 16 welded to the barrel or main body portion thereof. The probe 15 ls secured to the wall 17 of a stack or a furnace by means of the flange 16.
4r ~
Reference numeral 18 designates a cell Imit provided at the end of the probe 15 and consisting of a test-tube type zirconia solid e~ectrolyte 19 and a flange 20. The zirconia electrolyte 19 includes porous platinum electrode films 21 and 22 provided on the outer wall surface and the inner wall surface, respectively, of the closed end of the tube. A lead 23 is also provided, this consisting of a ring-shaped portion 23a formed on the outer wall surface of the solid electrolyte tube by baking a platinum paste and a connecting portion 23b along the outer wall surface through which the ring-shaped portion 23a is connected to the electrode film 21. A lead 24 is also pro-lQ vided, this consisting of a contact surface 24a formed by baking a platinum paste on the open end surface of the zirconia and a connecting portion 24b fnrmed on the inner wall surface and formed by baking a platinum paste and providing an electric connection between the contact surface 24a and the electrode film 22.
Reference numeral 25 denotes a heater for heating the zirconia 19 electrolyte tube. This constitutes, in combination with a temperature sensor (not shown) provided on the closed end of the zirconia tube 19 and a tem-perature controller (not shown~, a temperature control system for maintaining the zirconia 19 at a predetermined constant temperature. Reference numeral 2Q 26 denotes a contact ring provided with a recessed inner peripheral surface, 27 denotes a coil contact adapted to be fitted in the recess of the contact ring 26 and consisting of a nichrome wire or a wire of a heat resistant and anti-oxidation metal~ 28 denotes a highly insulative adhesive such as the material known commercially as Sumiceram, for fixing the contact ring 26 to the probe 15, and 29 denotes a wire lead covered by an insulator 30 and disposed in the probe 15 with one end thereof being connected to the contact ~rade ~1 Q ,k 3~3~3~
ring 26 while the other end is connected to an external terminal (not shown).
The coil contact 27 is held in contact with the ring-shaped portion 23a of the lead 23 wîth the zirconia tube l9 mounted in the probe 15, so that an electric path is fornled by electrode fîlm 21, lead 239 coil contact 27, contact ring 26 and the wire lead 29. Reference numeral 31 designates a mesh fîlter made of stainless steel, 32 denotes a flange and 33 denotes a bolt. rChe mesh filter 31 îs pressed and secured to the open end surface of the zirconia tube 19 by means of flange 32, so that an electric path is formed by the electrode film 22, lead 24, mesh filter 31, flange 20, flange 32 and the probe 15. Reference numeral 34 designates a partition plate extendîng longitudinally of the probe 15 and adapted to divide the internal cavity of the probe 15 other than the portion near the zirconia tube 19 into an upper section and a lower section. Reference numeral 35 denotes a cylindrical, conductive, metallic cap portion or lid provided adjacent the open end of the probe 15 which is remote from the zirconia tube 1~, whîle 36 denotes a wire lead connected to the metal plate cap. The metal cap 35 is open at olle end and is so onstructed as to permit the upper and lower sections of the internal cavity of the probe 15 to communicate with the out~ide independently of each other. This is achieved as can be seen by 2a the cap 35 being positîoned partl~ overlapping the open end portion of probe 15, the closed end of the cap 35 being joined centrally to the end of the partition 34. The metal cap 35 is electrically connected to the probe 15 so that the electric path including the electrode film 22 and the probe 15 is connected to the external terminal ~not shown~ through the wire lead 36.
rn the detecting section of the oxygen analyzer, the end of the probe 15 is held in the stream of the hot flue gas to be analyzed. Typically 3~
the gas temperature is about 200 to 50QC. The flue gas comes into the zirconia through the filter 31 by diffusion and convection to continuously contact the inner surface of the zirconia 19. The gas contacting the outer wall surface of the zirconia 19, i.e. the air in the probe 15, has been heated to a high temperature of about 700 to 800 C by the heat derived from the measurement gas and the heat produced by the heater 25. A natural convection current of air is thereby formed to include, as shown in Figure 3, the atmosphere, lower section of the internal cavity of the probe 15, end of the probe lS Cnear the zîrconia 19~, upper section of the internal cavity lQ of the probe 15 and the atmosphere. Therefore, the reference gas side of the zirconia 19 is always held in contact with fresh air, so that it is possible to obtain stably a detection signal between the two electrode films 21 and 22. The signal is then derived through the wire leads 29 and 30. Figure 3 shows the probe 15 held in a horizontal position but it should be stated that sufficient convection of air is maintained even if the probe 15 is inclined with the end thereof directed downwardly until the probe 15 comes to take a substantially vertical position with the cap 35 at the bottom.
As has been described above, the cell unit 18 is secured to the end of the probe 15 by means of a flange 32 and bolts 33, and the electric connection between the electrode fîlms 21,22 and the external terminals is made through the leads 23,24, coil contact 27 and the mesh filter 31. It is, therefore, possible to easily mount and demount the cell ~Init 18.
Thus, according to the invention, there is provided a solid eLectrolyte type oxygen analyzer having a cell unit which does not have lead wires so that the renewal of the solid e:Lectrolyte can be made easily to reduce the maintenance cost.
P3~
ReEerring now to Figures 5 and ~, reEerence numeral 37 denotes a probe having a flange 38 welded thereto and mounted on a flue or a furnace wall 39 by means of the flange 38. Reference numeral 40 denotes a cell unit con-sisting of a ~est-tube type zirconia solid electrolyte 41 and a flange 42 and adapted to be mounted on the end of the probe 37, while 43 designates a heater for heating the zirconia 41. Although not shown, porous electrode films of platinum are formed on both surfaces of the end (bottom of the test tube2 of the zirconia 41 as in the first described embodiment. A signal corresponding to the difference in the oxygen concentration between the two chambers separated by the wall of the zirconia 41, i.e. between the inner side and the outer side of the probe 37, is taken out of the probe by means of the electrode films as before. ~ temperature sensor (not shown) pro-vided at th~ end of the zirconia 41 constitutes, în combination with a temperature controller Cnot shown~ and a heater 43, a temperature control system which serves to maintain the zirconia at a predetermined constant temperature.
Reference numeral 44 denotes a conduit consisting of a straight portion 44a and a U-shaped portion 44b, 45 denotes a mesh filter provided at the open end of the zîrconia 41 and 46 denotes a flange. The flange 46 2Q supports the U-shaped portion 44b of the conduit 44 through the bracket 47 CFigure 6) and is adapted to be secured to thP probe 37 by means of bolts 48 thereby to fix the cell unit 40 to the end of the probe 37.
In this state, the open end of the U-shaped portion 44b of the conduit 44 is positioned in the hollow cavity of the zirconia 41, while the other end of the U-shaped portion is connected to one end of the straight portion 44a of the conduit 44. Reference numeral 49 denotes a partition D3~
plate which divides the internal cavity of the probe 37 other than the V:iCillity of the zirconia into an upper section and a lower section. A cylindrical lid 50 is constructed and positioned as in the first embodiment to permi-t the upper and lower sections of the internal cavity of the probe 37 to communicate with the atmosphere independently of each other.
In operation, the end portion of the probe 37 is held in the stream of hot (having a temperature of about 200 to 500 C) flue gas to be analyzed and the gas comes into the zirconia 41 through the filter 46 by diffusion and convection, thereby to make continuous contact with the inner wall surface of the zirconia 41. On the other hand, the gas contacting the outer wall surface of the zirconia 41, i.e. the air inside the probe 37, is heated to a high temperature of 700 to 850C by the heat from the flue gas - to be measured and the heat produced by the heater 43. In consequence, a natural convection current of air is formed to include, as shown in Figure 5, the atmosphere, lower section of the internal cavity of the probe 37, end of the probe 37 (near zirconia 41~, upper section of the internal cavity of the probe 37 and the atmosphere.
Therefore, the reference gas side of the zirconia 41 is always kept in contact with fresh air, so ~hat a stable signal is derived from the 2Q electrodes. In the measuring operation stated above, the conduit 44 is normally kept closed so that the gas in the conduit 44 never flows. The presence of the conduit 44, therefore, does not adversely affect at all the state of flow and composition oE the measured gas flowing into the zirconia 37. It is, however, possible to improve the response by making use of the conduit 44. Namely, the introduction of the measured gas into the zirconia 37 is accelerated to promote the substitution of the gas, by connecting one end of the conduit 44 to the SUCtiOII port of an ejector or the like.
3~3~
An explanation will be made as to the calibrating operation and cleaning opera~ion. The calibration is conducted by introducing, through the conduit 44, a calibration gas having a pressure somewhat higher than the pressure of the gas being analyzed into the zirconia 37. Since the calibra-tiOII gas has a pressure higher than the gas being analyzed, the substitution of two gases in the zirconia 37 can be made in quite a smooth manner to permit an accurate substitution of two gases.
By using a cleaning gas, e.g. instrumentation air in place of the calibration gas, it is possible to remove the dust attaching to the filter 46 and the zirconia 37 by blow-back.
For renewing the zirconia 37, the bolts 48 are loosened to sep-arate the straight portion 44a and the U-shaped portion 44b of the conduit 44 from each other, and the cell unit 40 is withdrawn from the end of the probe 37. It is, therefore, possible to renew the zirconia 37 in quite an easy manner.
As has been described, in the solid electrolyte type oxygen analyzer of the invention, the cell unit consisting of a test-tube type solid electro-lyte and a flange integral therewith is inserted into and fixed to the end of the probe with the closed end of the solid electrolyte directed inwardly.
~Q In addition, the conduit for introducing the calibration gas can be separated at a portion thereof near the end of the probe. It will be seen that the described arrangement of the oxygen analyzer remarkably facilitates the protective maintenance work for renewing the solid electrolyte.
Figure 7 shows an oxygen analyzer constructed in accordance with still another embodiment of the invention which achieves the aforesaid third object of the invention. ~he oxygen analyzer of this embodiment includes a ~ ~l8q,~ fl probe 51 having a flange 57 welcled to the barrel thereof and provided with through holes 55 and 56 Eormed in the side wall near the portion 51b thereof opposite to the end, a test-tube type zirconia solid electrolyte 52 mounted on the end of the probe 51, a heater 53 for heating the end (bottom of the test-tube~ of the zirconia 52, a partition plate 54 adapted to divide the internal cavity of the zirconîa 52 into two sections 51d and 51e while leaving a communicating portion 51c in the vicinity of the end of the zir-conia 52 as shown in Figure 8A, a cylindrical lid 59 adapted to close only the end Slb of the probe 51, detect-ing electrodes formed on both surfaces of 1~ the end wall of the zirconia 52, temperature sensor (not shown) for sensing the temperature of the end portion of the zirconia 52, a heater 53, a terminal box 60 for connecting the electrodes, temperature sensor and the heater to external circuits, a linearizing portion (not shown~ for linearizing the detection signal deri~ed through the terminal box 60 and adapted to deliver the linearized signal as its output, and a signal receiving portion (not shown~ consisting of the temperature sensor as the detection end and the heater 53 as the operation end. The probe 51 is adapted to be fixed to the stack or the furnace wall 61 by means of bolts 58 with the end 51a inserted into the flue thereby to measure the oxygen concentration in the ~Q measurement gas.
Although not shown in Figure 7, the wiring to the detecting electrodes, temperatllre sensor and the heater 53 is effected by making use of the partition plate 54 as the substrate, as shown in Figure 8B. Namely, the heater lead ~ire 62 and the electrode leads 63 are placed on the partition plate 54 and are pressed down and fixed by means of a leaf spring 65. ~t the same time, a temperature sensor lead 64 is fixed to the leaf spring 65 by spot welding.
The oxygen analyzer of this embocliment operates as fol:Lows:
In the measuring state, the end 5]a of the probe 51 i9 held in the stream of -the gas to be measured which has a temperature of about 200 to 500 C and one wall surface of the zirconia 52 is held in continuous contact with this stream oE gas. The space inside the probe 51 communiGates with the atmosphere through the through holes 55 and 56 and, therefore, is always filled with fresh air. Therefore, the detection electrodes provided on both surEaces of the wall of the zirconia produce a detection signal in accordance with the Nenlst's equation using the air as the reference gas. The detection signal i8 delivered to the signal receiving portion which conducts a pre-determined arithmetic operation to provide a signal corresponding to the oxygen concentration of the measured gas. The air in the probe 51 is heated to a high temperature of about 700C by the heat derived from the measured gas and the heat produced by the heater 53, so that a natural convection current of air is formed to include the atmosphere, through hole, 55, section 51e, communicating portion 51c, section 51d, through hole 56 and the atmos~
phere, as shown in Figure 7. In consequence, the other wall surface of the zirconia 52 îs maintained in contact with fresh air serving as the reference gas, so that the oxygen analyzer provides a stable output signal.
2a The present inventor has conducted the following test to confirm the presence of the convection current of air.
Atmospheric air was introduced into the area where the gas to be analyzed normally flows so that both sides of the wall of the zirconia 52 were subjected to atmospheric air. The space inside the probe 51 was maintained at a high temperature of about 700C. Then, N2 gas containing about 1% of 2 gas was supplied for 2 to 3 seconds to the area X2 in the q~3~1~
vic:inity of the through hole 55. Figure 9 :i9 a graph showing the change of the detectlon signal. The time To represents the time length over which the 1%
2 gas was blown. As will be understood from Figure q~ the change in the 2 gas concentration appearing at the area X2 is transmitted to the end of the zirconia 52 in about 8 seconds. Since the volume of section 51e in the probe 51 used in the experiment was about 150 ml, the flow rate of air moved by the convection can roughly be calculated to be about 1125 ml/min.
The embodiments heretofore described are not exclusive. For instance, it is possible to employ the communication means as shown in Figures 10 and 11. Namely, in the embodiment shown in Figure 10, the probe 51 is provided with a discharge sleeve 56' connected to the through hole 56 so that the convection in the probe 51 is promoted by the chimney-like action of the discharge sleeve 56'. In contrast, in the embodiment shown in Figure 11, the probe 1 is devoid of the through holes 55 and 56 shown in Figure 7 but, instead, the convection current is formed through the gap between the cylindrical lid 59 and the adjacent end portion 51b of the probe.
As has been described, in the oxygen analy~er of the inven~ion, the internal cavity of the probe is divided into t~o sections by a partition plate and the air is introduced into the cavity divided into two sections, to eliminate the necessity for a pump for supplying the air or piping for introducing instrumentation air, thereby reducing the co~t of production while remarkably improving the reliability of operation.
Claims (5)
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A solid electrolyte type oxygen analyzer having a probe type detecting section including a solid electrolyte fixed to the end thereof so as to form a partition wall and adapted to produce a signal corresponding to the difference in the oxygen concentration between the inner side and outer side of said partition wall, said oxygen analyzer comprising: a contact portion secured to the inner wall surface of said probe near the end of the latter through an electrically insulating member; a test tube type solid electrolyte inserted into and fixed to said end of said probe, said solid electrolyte having a first electrode and a second electrode which are closely secured to the outer wall surface and the inner wall surface of the closed end wall of said solid electrolyte or the portion of said solid electrolyte near said end wall, a first lead closely attached to said outer wall surface of said solid electrolyte and providing a connection between said first electrode and said contact portion, and a second lead closely attached to said inner wall surface of said solid electrolyte and providing an electric connection between said second electrode and the open end surface of said solid electrolyte; and a first conductor and a second conductor connected to said contact portion and said open end of said solid electrolyte, respec-tively, thereby to transmit the signals produced by said first and second electrodes.
2. An oxygen analyzer as claimed in claim 1, wherein said contact portion includes a contact ring provided with a recessed inner peripheral surface and fixed to the inner surface of said probe by an insulating adhesive, and a coil contact fitted in the recess of said contact ring.
3. An oxygen analyzer as claimed in claim 1, wherein said first and second leads are conductors which are formed on the wall surfaces by baking of a platinum paste.
4. An oxygen analyzer as claimed in claim 1, wherein said first conductor is a wire lead disposed in said probe and covered by an insulator.
5. An oxygen analyzer as claimed in claim 1, wherein said second conductor includes a metallic mesh filter provided on the open end of said solid electrolyte, a flange for pressing said filter onto said open end and to fix said solid electrolyte to said probe and the body of said probe which is conductive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000397396A CA1180384A (en) | 1981-03-06 | 1982-03-02 | Oxygen gas analyzer using solid electrolyte |
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP81-31125 | 1981-03-06 | ||
| JP3112581U JPS6346841Y2 (en) | 1981-03-06 | 1981-03-06 | |
| JP56079865A JPS57194348A (en) | 1981-05-26 | 1981-05-26 | Solid electrolyte oxygen meter |
| JP81-79865 | 1981-05-26 | ||
| JP56089908A JPS57204448A (en) | 1981-06-11 | 1981-06-11 | Solid electrolyte oxygen meter |
| JP81-89908 | 1981-06-11 | ||
| CA000397396A CA1180384A (en) | 1981-03-06 | 1982-03-02 | Oxygen gas analyzer using solid electrolyte |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1180384A true CA1180384A (en) | 1985-01-02 |
Family
ID=27287213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000397396A Expired CA1180384A (en) | 1981-03-06 | 1982-03-02 | Oxygen gas analyzer using solid electrolyte |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1180384A (en) |
| GB (2) | GB2096772B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4026591B4 (en) * | 1990-08-23 | 2005-08-25 | Pleva Gmbh | Apparatus for determining the loading of air with vapors |
| FR2681137B1 (en) * | 1991-09-11 | 1994-07-29 | Superba Sa | DEVICE FOR MEASURING AND ADJUSTING THE AIR CONCENTRATION OF A SPEAKER. |
| FR2735866B1 (en) * | 1995-06-22 | 1997-08-29 | Crevoiserat Jean Michel | PROBE FOR MEASURING THE PARTIAL PRESSURE OF OXYGEN IN DOMESTIC AND INDUSTRIAL CHIMNEYS |
| US20040149579A1 (en) * | 2002-12-19 | 2004-08-05 | General Electric Company | System for monitoring combustible gases |
| CN110146576B (en) * | 2019-06-13 | 2020-05-19 | 东北大学 | Electrochemical testing device for solid electrolyte |
| RU2745082C1 (en) * | 2020-06-16 | 2021-03-19 | Общество с ограниченной ответственностью "Научно-производственное предприятие ОКБА" (ООО "НПП ОКБА") | Gas analyzer |
-
1982
- 1982-03-02 CA CA000397396A patent/CA1180384A/en not_active Expired
- 1982-03-05 GB GB8206502A patent/GB2096772B/en not_active Expired
- 1982-08-20 GB GB08223968A patent/GB2112526B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2096772A (en) | 1982-10-20 |
| GB2112526A (en) | 1983-07-20 |
| GB2096772B (en) | 1984-12-05 |
| GB2112526B (en) | 1984-12-05 |
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