CN203534993U - Integrated conductance cell type hydrogen analyzer - Google Patents
Integrated conductance cell type hydrogen analyzer Download PDFInfo
- Publication number
- CN203534993U CN203534993U CN201320632656.6U CN201320632656U CN203534993U CN 203534993 U CN203534993 U CN 203534993U CN 201320632656 U CN201320632656 U CN 201320632656U CN 203534993 U CN203534993 U CN 203534993U
- Authority
- CN
- China
- Prior art keywords
- conductance cell
- source circuit
- precision constant
- current source
- hydrogen analyzer
- 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 - Fee Related
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- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 30
- 239000001257 hydrogen Substances 0.000 title claims abstract description 26
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000010276 construction Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 26
- 239000007789 gas Substances 0.000 description 15
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 14
- 229910021529 ammonia Inorganic materials 0.000 description 13
- 229910052697 platinum Inorganic materials 0.000 description 7
- 238000010494 dissociation reaction Methods 0.000 description 5
- 230000005593 dissociations Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 3
- 238000005121 nitriding Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The utility model discloses an integrated conductance cell type hydrogen analyzer which comprises a high-precision constant-current source circuit and a conductance cell, wherein the high-precision constant-current source circuit is arranged in the casing of the conductance cell. The high-precision constant-current source circuit and the conductance cell are integrated into a whole. As the high-precision constant-current source circuit is arranged in the casing of the conductance cell and the casing adopts a sealed structure, the high-precision constant-current source circuit is prevented being corroded and damaged in the corrosive environment and the failure-free service time of the hydrogen analyzer is prolonged, meanwhile, the exchangeability of a primary instrument and a secondary instrument can be ensured and the maintenance and replacement are facilitated.
Description
Technical field
The utility model relates to hydrogen analyzer technical field, especially a kind of integrated conductance cell formula hydrogen analyzer of the measure ammonia dissociation rate for thermal treatment nitriding furnace atmosphere.
Background technology
The action principle of hydrogen analyzer is based on measuring the wherein concentration of hydrogen by measuring the temperature conductivity of tested mixed gas, the measure ammonia dissociation rate that can be used for thermal treatment nitriding furnace atmosphere, thereby be by measuring ammonia, to decompose the variation indication ammonia dissociation rate of rear hydrogen percentages content, also can be used for atmosphere in heat treatment atmosphere nitriding furnace and control, also can be used for ammonia and decompose gas making device.
The electrical system of hydrogen analyzer is comprised of high precision constant current power supply and conductance cell two large divisions, and conductance cell forms Wheatstone bridge by four thermistors, and two are filled with ammonia, and another two pass to analyzed gas, when analyzer passes into 0% H
2gas time (being generally nitrogen or air), regulator potentiometer, makes Hui Sideng electric bridge place and equilibrium state, is output as 0 mV; When passing into 100%H
2gas time, electric bridge is in non-equilibrium state, regulator potentiometer, makes to be output as 100 mV.In the structure of existing hydrogen analyzer, there are two types:
1, conductance cell 1 and high-precision constant flow source circuit 2 splits: conductance cell 1 and high precise current source 2 are made respectively, as shown in Figure 1, then both are assembled in a larger instrument housing, output 0 ~ 100mV direct current signal offers secondary instrument 3.The defect of this scheme is that high-precision constant flow source circuit 2 is exposed in meter housing, and while unavoidably using in the surrounding enviroment that contain corrosive gas ammonia due to this instrument, this circuit is easy to be subject to the corrosion of ammonia and damages, and causes this analyser to lose efficacy.
2, conductance cell 1 directly connects secondary instrument 3: this scheme is that high-precision constant flow source circuit 2 is made in secondary instrument 3, and as shown in Figure 2, secondary instrument 3 is directly connected with conductance cell 1.Although this scheme has overcome the defect of split, owing to forming the discreteness of the core parts platinum resistance of conductance cell 1, cause conductance cell 1 not possess interchangeability, secondary instrument 3 must use with conductance cell 1 pairing.In use, any one has fault secondary instrument and conductance cell, secondary instrument and conductance cell must be returned to manufacturing firm's maintenance simultaneously or changes, and to field maintemance, repairs and has brought inconvenience.
Utility model content
The utility model is for the deficiencies in the prior art, a kind of integrated conductance cell formula hydrogen analyzer is proposed, can avoid high-precision constant flow source circuit to be corroded in corrosive atmosphere, thereby extend hydrogen analyzer accident-free duration, can guarantee the interchangeability of primary instrument and secondary instrument again, be convenient to maintenance and change simultaneously.
In order to realize above-mentioned utility model object, the utility model provides following technical scheme: a kind of integrated conductance cell formula hydrogen analyzer, comprise high-precision constant flow source circuit and conductance cell, and described high-precision constant flow source circuit is located in the housing of described conductance cell.
Further, described housing is hermetically-sealed construction.
Compared with prior art, the utlity model has following advantage: high-precision constant flow source circuit and conductance cell are made of one.High-precision constant flow source circuit is made in the housing of conductance cell, housing adopts hermetically-sealed construction, both can avoid high-precision constant flow source circuit in corrosive atmosphere, to be corroded and to damage, thereby extend hydrogen analyzer accident-free duration, can guarantee the interchangeability of primary instrument and secondary instrument again, be convenient to maintenance and change simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of conductance cell and high-precision constant flow source circuit split;
Fig. 2 is the structural representation that conductance cell directly connects secondary instrument;
Fig. 3 is structural representation of the present utility model;
Fig. 4 is the schematic diagram of the utility model circuit.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail, the description of this part is only exemplary and explanatory, should not have any restriction to protection domain of the present utility model.
A kind of integrated conductance cell formula hydrogen analyzer as shown in Figure 3, comprises high-precision constant flow source circuit 2 and conductance cell 1, in described high-precision constant flow source circuit 2(figure shown in dotted line frame) be located in the housing of described conductance cell 1.Described housing is hermetically-sealed construction, conductance cell 1 main body and upper cover 11 sealings, consists of.Two fine rules of conductance cell 1 top represent external power supply and signal output.
Because the absolute value of gas conduction rate is minimum, directly measurement is more difficult, in actual measurement, is the resistance value changing because of gas conduction rate by measuring thermistor, indirectly records the different thermal conductivity of gas with various.Hydrogen analyzer is made heat-sensitive element to lead to electrically heated platinum filament, when in analyzed gas, density of hydrogen changes, the temperature conductivity of analyzed gas changes thereupon, heat on sensitive element platinum filament is taken away, the resistance value of sensitive element platinum filament also changes thereupon, and in Wheatstone bridge, produces unbalance voltage output.
Ammonia pyrolytic is nitrogen and hydrogen, the H producing after ammonia decomposes
2with N
2the ratio of volume is 3: 1.When ammonia dissociation rate is 0%, H
2concentration is 0; When ammonia dissociation rate is 100%, H
2concentration is 75 %.H in gas
2when concentration is 0%, this analyzer is output as 0 mV; H
2when concentration is 100%, be output as 100 mV.
As shown in Figure 4, input power provides the 5V direct supply of 500mA, for constant current source provides power supply; Four thermistors that constant-current source circuit is conductance cell form the stable constant current that Wheatstone bridge provides about 120mA, are platinum filament energising heating; When in analyzed gas, density of hydrogen changes, the temperature conductivity of analyzed gas changes thereupon, and the heat on sensitive element platinum filament is taken away, and the resistance value of sensitive element platinum filament also changes thereupon, and in Wheatstone bridge, produces unbalance voltage output.By returning to zero and adjusting full scale circuit, the unbalance voltage producing is adjusted into the output voltage range 0 ~ 100mV of standard, corresponding 0 ~ 100% hydrogen richness in Wheatstone bridge.
This hydrogen analyzer with conductance cell and high precise current source are made respectively, then both are assembled in a larger instrument housing, output 0 ~ 100mV direct current signal offers the scheme of secondary instrument and compares, the advantage of this programme is that high-precision constant flow source circuit is sealed in conductance cell shell, while using in the surrounding enviroment that contain corrosive gas ammonia, can avoid this circuit to be corroded and to damage, thereby cause this analyser to lose efficacy.
This hydrogen analyzer with high-precision constant flow source circuit is made in secondary instrument, the scheme that secondary instrument is directly connected with conductance cell is compared, this programme is made in high-precision constant flow source circuit in the shell of conductance cell, by returning to zero and adjusting full scale circuit, make hydrogen analyzer possess interchangeability, to field maintemance, repair or change and brought convenience.
Claims (2)
1. an integrated conductance cell formula hydrogen analyzer, comprises constant-current source circuit and conductance cell, it is characterized in that: described constant-current source circuit is located in the housing of described conductance cell.
2. integrated conductance cell formula hydrogen analyzer as claimed in claim 1, is characterized in that: described housing is hermetically-sealed construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320632656.6U CN203534993U (en) | 2013-10-14 | 2013-10-14 | Integrated conductance cell type hydrogen analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320632656.6U CN203534993U (en) | 2013-10-14 | 2013-10-14 | Integrated conductance cell type hydrogen analyzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203534993U true CN203534993U (en) | 2014-04-09 |
Family
ID=50421188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320632656.6U Expired - Fee Related CN203534993U (en) | 2013-10-14 | 2013-10-14 | Integrated conductance cell type hydrogen analyzer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203534993U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107037200A (en) * | 2015-11-27 | 2017-08-11 | 希森美康株式会社 | Specimen inspection system, information processor and information processing method |
| CN108169277A (en) * | 2017-12-25 | 2018-06-15 | 中国航发动力股份有限公司 | A kind of calibration equipment and its method of calibration of ammonia gas in nitridation furnace resolution ratio |
| CN113155918A (en) * | 2021-04-26 | 2021-07-23 | 中国核动力研究设计院 | Constant potential driving type hydrogen concentration sensor transmitting circuit |
-
2013
- 2013-10-14 CN CN201320632656.6U patent/CN203534993U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107037200A (en) * | 2015-11-27 | 2017-08-11 | 希森美康株式会社 | Specimen inspection system, information processor and information processing method |
| CN108169277A (en) * | 2017-12-25 | 2018-06-15 | 中国航发动力股份有限公司 | A kind of calibration equipment and its method of calibration of ammonia gas in nitridation furnace resolution ratio |
| CN113155918A (en) * | 2021-04-26 | 2021-07-23 | 中国核动力研究设计院 | Constant potential driving type hydrogen concentration sensor transmitting circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 |