CN203101322U - Trace oxygen analyzer - Google Patents
Trace oxygen analyzer Download PDFInfo
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- CN203101322U CN203101322U CN 201220548543 CN201220548543U CN203101322U CN 203101322 U CN203101322 U CN 203101322U CN 201220548543 CN201220548543 CN 201220548543 CN 201220548543 U CN201220548543 U CN 201220548543U CN 203101322 U CN203101322 U CN 203101322U
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- sensor
- circuit
- gas
- oxygen analyzer
- trace oxygen
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Abstract
The embodiment of the utility model provides a trace oxygen analyzer comprising a sensor combination and a gas path combination, wherein the components in the gas path combination and the gas path combination as well as the sensor combination are communicated in a hardware connecting manner. A sealing structure of the components in the gas path combination and the sealing structure of the gas path combination and the sensor combination are improved to enhance the oxygen concentration detecting precision of the trace oxygen analyzer.
Description
Technical field
The utility model relates to analytical instrument instrument field, relates in particular to a kind of trace oxygen analyzer.
Background technology
Oxygen analyzer is the analysis meter of gas field indispensability, has been widely used in the fields such as chemical industry, metallurgical industry, environmental monitoring, health care, Aero-Space, electronics industry.According to the difference of sensing range, oxygen analyzer can be divided into percentage composition oxygen analyzer and trace oxygen analyzer.Wherein the percentage composition oxygen analyzer can be divided into electrochemical principle, zirconia principle and paramagnetic formula principle by principle.Trace oxygen analyzer can be divided into electric chemical formula principle and zirconia principle by principle.At present, percentage composition oxygen analyzer table mostly is portable apparatus, has little, easy and simple to handle, the cheap advantage of volume; Trace oxygen analyzer is with online and the research instrument is in the majority, and electrochemical principle trace oxygen analyzer wherein has fast, the high advantage of accuracy of response.
Wherein, electrochemical principle is meant: the sensor of instrument is an alkaline primary cell that is made of solid electrolyte and only oxysensible Ag-Pb electrode, when the oxygen molecule in the sample gas penetrates into primary element by permeable membrane, produces following reaction on electrode:
On silver (Ag) negative electrode: O
2+2H
2O+4e ← 4OH
-
On plumbous (Pb) anode: 2Pb+2KOH+4OH
--4e → 2KHPbO
2
Therefore, when the oxygen molecule in the sample gas penetrates into primary element by permeable membrane, then negative electrode and the anode at primary element produces terrible betatopic, if the anode and cathode of primary element forms the closed-loop path, then there is electric current to flow through in the loop, the size of its electric current changes with the size of oxygen concentration, therefore as long as record primary element current in loop value, i.e. and oxygen concentration value in the sample gas as can be known.
At present, generally form based on the trace oxygen analyzer of electrochemical principle by gas circuit combination, sensor combinations, signal processing circuit and display module etc.Gas is entered by the gas circuit inlet of analyzer, enter in the sensor combinations then, in sensor combinations, when oxygen molecule penetrated into sensor by permeable membrane, then negative electrode and the anode at sensor produced terrible betatopic, if the anode and cathode of sensor forms the closed-loop path, then there is electric current to flow through in the loop, the size of its electric current changes with the size of oxygen concentration, therefore as long as record the current value of sensor in the loop by signal processing circuit, i.e. and the oxygen concentration value of gas as can be known.
At present, trace oxygen analyzer general stainless-steel tube that adopts on gas circuit connects, adopt O RunddichtringO sealing means in the interface junction, utility model people in the course of the work, find through conscientious analysis, the O RunddichtringO does not have the good restraining effect to the filter down effect of ambient oxygen, and can produce certain parsing adsorption effect to micro amount of oxygen yet, thereby finally influences the accuracy of detection to oxygen concentration of trace oxygen analyzer.
The utility model content
In view of this, the trace oxygen analyzer that provides of the utility model.By improving between inner each parts of gas circuit combination and the hermetically-sealed construction between gas circuit combination and the sensor combinations, improved the accuracy of detection of trace oxygen analyzer to oxygen concentration.
The trace oxygen analyzer that the utility model provides comprises: the combination of sensor combinations and gas circuit, and all adopt hard connecting mode to be communicated with between inner each parts of described gas circuit combination and between the combination of described gas circuit and the described sensor combinations.
Further: described gas circuit combination comprises: draft tube, escape pipe, gas access joint and gas outlet joint, and described sensor combinations comprises: sensor gas access joint and sensor gas outlet joint; The two ends of described draft tube are communicated with described gas access joint and sensor gas access joint by metal ferrule respectively, and the two ends of described escape pipe are communicated with described gas outlet joint and sensor gas outlet joint by metal ferrule respectively.
Further: described sensor combinations also comprises: sensor body and sensor, described sensor gas access joint and sensor gas outlet joint are fixed on the outer wall of described sensor body, described sensor body inside have one with the material-putting space of the same size of described sensor, described sensor is installed in the described material-putting space.
Further: described sensor body comprises: sensor pond, sender unit cap and O-ring seal, inside, described sensor pond has first cavity and second cavity, described second cavity is positioned at described first cavity, and the inwall of described second cavity forms described material-putting space, when described sender unit cap covers on described sensor pond, described sender unit cap seals described second cavity, and the sealing of the underrun O-ring seal of described sender unit cap and described first cavity.
Further: described sensor combinations also comprises: thermistor, the inside of described sender unit cap have a thermistor mounting hole, and described thermistor is fixed in the described thermistor mounting hole.
Further: also comprise: signal processing circuit, have a signal conductor connecting hole on the described sender unit cap, the input end of signal conductor is connected with thermistor with described sensor, and output terminal passes described signal conductor connecting hole and is connected with described signal processing circuit.
Further: described signal processing circuit comprises: the current-to-voltage converting circuit that is linked in sequence, operational amplification circuit, low-pass filter circuit, temperature-compensation circuit, zeroing circuit and range regulating circuit.
Further: also comprise: display module, described display module is connected to described signal processing circuit, is used to receive the oxygen concentration value signal that described signal processing circuit is transported to, and shows.
The beneficial effects of the utility model:
Owing to all adopt hard connecting mode to be communicated with between inner each parts of gas circuit combination and between gas circuit combination and the sensor combinations, and hard connecting mode is compared to the sealing means of O RunddichtringO, the filter down effect that can suppress ambient oxygen well, also can reduce the parsing adsorption effect of gas circuit well, thereby improve the accuracy of detection of trace oxygen analyzer oxygen concentration to micro amount of oxygen.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described:
Fig. 1 is the structural representation of the embodiment of trace oxygen analyzer of the present utility model.
Fig. 2 is the structural representation of the embodiment of gas circuit combination of the present utility model and sensor combinations.
Fig. 3 is the structural representation of the embodiment of sensor combinations of the present utility model.
Embodiment
Please refer to Fig. 1, it is the structural representation of the embodiment of trace oxygen analyzer of the present utility model, this trace oxygen analyzer can be applied to be used for oxygen concentration is detected in the fields such as chemical industry, metallurgical industry, environmental monitoring, health care, Aero-Space, electronics industry.This trace oxygen analyzer comprises: chassis body 101, gas circuit combination 1, sensor combinations 2, signal processing circuit 3 and display module 4.Gas circuit combination 1, sensor combinations 2, signal processing circuit 3 and display module 4 are linked in sequence, and all by being spirally connected or mode such as clamping is fixed in the chassis body.
When measuring oxygen concentration, gas to be measured is entered in the sensor combinations 2 by gas circuit combination 1, in sensor combinations 2, oxygen molecule penetrates into sensor by permeable membrane, the negative electrode of sensor and anode produce betatopic, form the closed-loop path, there is electric current to flow through in the loop, the size of its electric current changes with the size of oxygen concentration, can record oxygen concentration value in the gas by signal processing circuit 3, and shows by display module 4.In addition, the gas through sensor combinations 2 finally also makes up discharge in 1 by gas circuit.
In the present embodiment, gas circuit makes up between 1 inner each parts and between gas circuit combination 1 and the sensor combinations 2 and no longer adopts the mode of O RunddichtringO to seal, but adopts hard connecting mode to be communicated with.Adopt the benefit of hard connecting mode sealing to be: can suppress the filter down effect of ambient oxygen well, also can reduce the parsing adsorption effect of gas circuit well, thereby improve the accuracy of detection of trace oxygen analyzer to oxygen concentration to micro amount of oxygen.
Respectively each parts in the trace oxygen analyzer are described below.
Shown in Fig. 2 and 3, gas circuit combination 1 comprises: draft tube 11, escape pipe 12, gas access joint 13 and gas outlet joint 14, sensor combinations 2 comprises: sensor gas access joint 23 and sensor gas outlet joint 24.Wherein, gas access joint 13 and gas outlet joint 14 all are fixed on the rear panel 5 of chassis body, the two ends of draft tube 11 are communicated with gas access joint 13 and sensor gas access joint 23 by metal ferrule 15 respectively, and the two ends of escape pipe 12 are communicated with gas outlet joint 14 and sensor gas outlet joint 24 by metal ferrule 15 respectively.Preferably, above-mentioned each parts all adopt the stainless steel manufacturing, realize that by the mutual extrusion between the metal parts seepage of gas does not take place interface.In the said structure, gas circuit combination 1 simple in structure, the parts of whole gas circuit combination 1 can be the stainless steel metal material, good leak tightness can effectively reduce the infiltration of ambient oxygen, reduces the adsorption effect of gas circuit to micro amount of oxygen.
As shown in Figure 3, sensor combinations 2 also comprises: sensor body 200 and sensor 26 except the above-mentioned sensor gas access joint of mentioning 23 and sensor gas outlet joint 24.In one embodiment, sensor body comprises: sensor pond 21 and sender unit cap 22.Wherein, sensor gas access joint 22 and sensor gas outlet joint 24 can be (for example: on outer wall sensor pond 21) to be fixed on sensor body.Have in sensor body inside one with the material-putting space of the same size of sensor 26, sensor 26 is installed in this material-putting space.Need to prove, this material-putting space is an enclosure space, material-putting space is meant that with the big or small consistent of sensor 26 working as sensor is installed in this material-putting space, this material-putting space does not almost have clearance spaces, so the reason that is provided with is: existing trace oxygen analyzer is because complex structure, general space dead volume is bigger, the space dead volume is meant: in the analytical instrument gas circuit, the space that the phase that is not fixed (fixed substance) occupies, the component that just is not fixed mutually and is detained, from sample introduction to the required mobile phase volume of peak-peak occurring.And the space dead volume is got over senior general and is caused down problems such as oxygen speed is slow, data fluctuations is big when measuring, following oxygen speed is meant: because concentration of oxygen is bigger in the environment, before instrument comes into operation, the concentration of oxygen is often near oxygen concentration in the environment in the instrument, in order to realize the measurement of micro amount of oxygen, feed nitrogen usually oxygen is discharged to outside the instrument, oxygen content is lower than 0.5PPM in instrument, come into operation, the required time length of this deoxygenation process is down oxygen speed again.Adopt above-mentioned sensor combinations 2 structures, can reduce the space dead volume, avoid oxygen to remain in the sensor combinations, solve down problems such as oxygen speed is slow, data fluctuations is big when measuring effectively.Further, 21 inside, sensor pond have one first cavity 29 and one second cavity, 201, the second cavitys 201 are positioned at first cavity 29, and the inwall of second cavity 201 forms above-mentioned material-putting space.When sender unit cap 22 covered on sensor pond 21, sender unit cap 22 formed closed structure with 201 sealings of second cavity.In addition, the underrun O-ring seal 25(of the sender unit cap 22 and first cavity 29 for example: the sealing O RunddichtringO).As shown in Figure 3, sender unit cap 22 is except having the structure place that cooperates with sensor pond 21, and portion also has a thermistor mounting hole 28 within it, is used to install thermistor, and the effect of thermistor is the temperature variations of detecting sensor combination 2.On sender unit cap 22, also has a signal conductor connecting hole 27, the input end that is used to connect the signal conductor of sensor combinations 2 and signal processing circuit 3 is connected to thermistor and sensor 26, output terminal passes signal conductor connecting hole 27 and is connected to signal processing circuit, is used for the temperature variation signal of the sensor combinations 2 of thermistor perception and the sensor signal of sensor 26 are transported to signal processing circuit 3.In above-mentioned, because sensor body can be formed by sensor pond 21 and sender unit cap 22, and sensor pond 21 and sender unit cap 22 are by O-ring seal 25 sealings, it is flexible to make that sensor body has a dismounting, and sensor 26 is changed advantages such as convenient, for the maintenance work of sensor combinations has brought convenience, and said structure is simple, the strict principle of design of following the minimum space dead volume in design, therefore degree ground reduces the space dead volume greatly, improves oxygen speed down.
Signal processing circuit comprises: the current-to-voltage converting circuit that is linked in sequence, operational amplification circuit, low-pass filter circuit, temperature-compensation circuit, zeroing circuit and range regulating circuit.Wherein, current-to-voltage converting circuit converts the current signal of sensor output to voltage signal, the undesired signal that operational amplification circuit may occur by low-pass filter circuit after voltage signal is amplified is again eliminated, temperature-compensation circuit compensates signal, reduce the influence of temperature to detection signal, zeroing circuit effectively solves exports non-vanishing problem, the output area of signal when the range regulating circuit can effectively be stablized the range switching when circuit is input as zero.Be by the reason that in signal processing circuit, increases temperature-compensation circuit: in existing, in order to eliminate the influence of ambient temperature to the sensor signal output of electric chemical formula trace oxygen analyzer, analyser in the past adopts thermostatically controlled method to make sensor combinations constant under a temperature, the general requirement of this temperature is higher than environment temperature, usually be chosen between 50-60 ℃, when though sensor is controlled between 50-60 ℃, sensor can operate as normal, but, so reduce greatly the serviceable life of sensor because the sensor long-term work is under the condition of high temperature.And present embodiment reduces the influence of environment temperature to sensor in the trace oxygen analyzer by adopt temperature-compensation circuit in signal Processing, has both guaranteed like this that the accuracy of detection of instrument was not subjected to Temperature Influence, has also prolonged the serviceable life of sensor simultaneously.During specific implementation, sensor combinations work at ambient temperature, by thermistor the temperature signal of sensor combinations is passed to signal processing circuit, the temperature-compensation circuit in the signal processing circuit compensates sensor signal according to the temperature signal from thermistor.
Display module comprises: analog to digital conversion circuit, control module (as: CPU), display screen and keyboard.Wherein, analog to digital conversion circuit converts the simulating signal (as: oxygen concentration value signal) of signal processing circuit output to digital signal that control module can be handled, control module carries out digital signal to be presented on the display screen after the analyzing and processing again, and keyboard can be provided with display parameter.
Explanation is at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (8)
1. trace oxygen analyzer comprises: sensor combinations and gas circuit combination is characterized in that: all adopt hard connecting mode to be communicated with between inner each parts of described gas circuit combination and between the combination of described gas circuit and the described sensor combinations.
2. trace oxygen analyzer as claimed in claim 1, it is characterized in that: described gas circuit combination comprises: draft tube, escape pipe, gas access joint and gas outlet joint, and described sensor combinations comprises: sensor gas access joint and sensor gas outlet joint; The two ends of described draft tube are communicated with described gas access joint and sensor gas access joint by metal ferrule respectively, and the two ends of described escape pipe are communicated with described gas outlet joint and sensor gas outlet joint by metal ferrule respectively.
3. trace oxygen analyzer as claimed in claim 2, it is characterized in that: described sensor combinations also comprises: sensor body and sensor, described sensor gas access joint and sensor gas outlet joint are fixed on the outer wall of described sensor body, described sensor body inside have one with the material-putting space of the same size of described sensor, described sensor is installed in the described material-putting space.
4. trace oxygen analyzer as claimed in claim 3, it is characterized in that: described sensor body comprises: sensor pond, sender unit cap and O-ring seal, inside, described sensor pond has first cavity and second cavity, described second cavity is positioned at described first cavity, and the inwall of described second cavity forms described material-putting space, when described sender unit cap covers on described sensor pond, described sender unit cap seals described second cavity, and the sealing of the underrun O-ring seal of described sender unit cap and described first cavity.
5. trace oxygen analyzer as claimed in claim 4 is characterized in that: described sensor combinations also comprises: thermistor, the inside of described sender unit cap have a thermistor mounting hole, and described thermistor is fixed in the described thermistor mounting hole.
6. trace oxygen analyzer as claimed in claim 5, it is characterized in that: also comprise: signal processing circuit, has a signal conductor connecting hole on the described sender unit cap, the input end of signal conductor is connected with thermistor with described sensor, and output terminal passes described signal conductor connecting hole and is connected with described signal processing circuit.
7. trace oxygen analyzer as claimed in claim 6 is characterized in that: described signal processing circuit comprises: the current-to-voltage converting circuit that is linked in sequence, operational amplification circuit, low-pass filter circuit, temperature-compensation circuit, zeroing circuit and range regulating circuit.
8. trace oxygen analyzer as claimed in claim 7 is characterized in that: also comprise: display module, described display module is connected to described signal processing circuit, is used to receive the oxygen concentration value signal that described signal processing circuit is transported to, and shows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220548543 CN203101322U (en) | 2012-10-24 | 2012-10-24 | Trace oxygen analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220548543 CN203101322U (en) | 2012-10-24 | 2012-10-24 | Trace oxygen analyzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203101322U true CN203101322U (en) | 2013-07-31 |
Family
ID=48852713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220548543 Withdrawn - After Issue CN203101322U (en) | 2012-10-24 | 2012-10-24 | Trace oxygen analyzer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203101322U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928491A (en) * | 2012-10-24 | 2013-02-13 | 重庆川仪分析仪器有限公司 | Trace oxygen analyzer |
| CN105723377A (en) * | 2013-12-17 | 2016-06-29 | 英特尔公司 | Secure enclaves for use by kernel mode applications |
-
2012
- 2012-10-24 CN CN 201220548543 patent/CN203101322U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928491A (en) * | 2012-10-24 | 2013-02-13 | 重庆川仪分析仪器有限公司 | Trace oxygen analyzer |
| CN102928491B (en) * | 2012-10-24 | 2014-11-05 | 重庆川仪分析仪器有限公司 | Trace oxygen analyzer |
| CN105723377A (en) * | 2013-12-17 | 2016-06-29 | 英特尔公司 | Secure enclaves for use by kernel mode applications |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130731 Effective date of abandoning: 20141105 |
|
| RGAV | Abandon patent right to avoid regrant |