CN88211603U - Calibrating apparatus of dynamic humidity - Google Patents
Calibrating apparatus of dynamic humidity Download PDFInfo
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- CN88211603U CN88211603U CN 88211603 CN88211603U CN88211603U CN 88211603 U CN88211603 U CN 88211603U CN 88211603 CN88211603 CN 88211603 CN 88211603 U CN88211603 U CN 88211603U CN 88211603 U CN88211603 U CN 88211603U
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Abstract
The utility model relates to a calibration device for dynamic humidity, belonging to the field of the testing or calibrating meteorological apparatus, aiming to build a calibration device for low humidity to calibrate the apparatus and the sensor for humidity measurement, comprising an air drying system, an air humidifying system, and a dew point apparatus. The air drying system adopts the arrangement mode of 5A molecular sieve-3A molecular sieve-liquid nitrogen freezing spiral pipe; the air humidifying system uses an activated carbon +HT-1 type catalyst pipe; the thermocouple of the dew point apparatus is welded in a hole under the center of a condensate mirror surface. The calibration device for dynamic humidity is simple and practical, and the calibration range for dynamic humidity is-110 DEG C-20 DEG C bloom point.
Description
The utility model " dynamic psychrometric calibrating installation " belongs to the test or the calibration field of meteorological apparatus.
The instrument of all relative measurement humidity and sensor all will be calibrated with other standard humidity methods.Many articles to humidity standard done commentary (for example: (1) K.G.Parker3, Mea3 ure-ment and Control, 12(2), p73(1979); (2) the rice pine is shone son, the instrumentation technology,
5(3), p.27(1977); (3) Wang Weitong, analytical instrument, (3), p.20(1978); (4) Hao Guang is intact translates, semiconductor sensor spare, (1), p.54, (1986).The Hasegawa of NBS is divided into benchmark, standard, secondary standard and working stamndard four big classes to humidity standard, summarized the relevant instrument (S.Hasegawa that secondary standard is used that can be used as of the principle of humidity standard methods such as gravimetric method, two platen press, dual-temperature process, double-current method and humidity point of fixity method and this innings exploitation, ISA Trans.
25(3), 15(1986)).In these methods, double-current method (mixing method or shunting) inertia is little, is suitable for dynamic studies, thereby is used widely.Dew point method is absolute hygrometric method, and accurate dew point hygrometer and dew point hygrometer can be respectively as secondary standard and working stamndards.
Yang Guodong and once a nail (sensor technology, (3), p.27(1986)) introduced external several shunting humidity generator.This humidity generator will be done, wet two strands of air-flows mix (claiming dilution again) to obtain continuous flow, that vapour content is known and adjustable constant humidity air-flow.Therefore, this device comprises dry gas generating means and dry gas humidifying device.For example, the M136 type humidity calibration device that China introduces, it adopts the secondary dilution flow process, and vapour content can be regulated in 1～3600000ppm as required in the constant humidity air-flow that is taken place, and provides exact value with accurate dew point hygrometer.This device has and can obtain frost point and be-87 ℃ gas-drying system and the lower bound frost point constant humidity air-flow for-73.3C.This device accuracy height, variable humidity range is wide.But this apparatus structure complexity costs an arm and a leg, and the lower bound frost point is still too high, is unsuitable for the more calibration and the check of low humidity instrument.
The purpose of this utility model is to set up the low humidity calibrating installation, in order to the instrument and the sensor of calibration moisture measurement.The humidity dynamic calibration scope of this device is that-110 ℃～-20 ℃ frost points (are equivalent to 0.001～1000ppmH
2O).
The utility model is made of gas-drying system, gas humidification system and dew point hygrometer three parts.
1. gas-drying system: form by 5A molecule screen casing, 3A molecule screen casing and liquid nitrogen frozen spiral pipe.The pure hydrogen of steel cylinder with 99.99% is made source of the gas.This drying system is characterised in that its arrangement mode.Different with the arrangement of normally used 3A molecular sieve-5A molecular sieve-liquid nitrogen frozen spiral pipe, the arrangement mode of employing 5A molecular sieve-3A molecular sieve-liquid nitrogen frozen spiral pipe.This is because notice that dry usefulness is 5A molecular sieve＜3A molecular sieve＜liquid nitrogen frozen spiral pipe, makes in the gas drying of moisture take to tighten up step by step with arrangement mode of the present utility model, and the frost point of the dry hydrogen of Huo Deing is lower than-122 ℃ like this.We are called " zero point " gas this dry gas.
2. gas humidification system: form by acticarbon+catalyst tube, the formula of exosmosing osmos tube and the calibration cell of placing osmos tube.Make source of the gas with the general hydrogen of steel cylinder.The utility model adopts HT-1 type catalyzer (Dalian catalyst plant product), can be the oxygen catalysis in the general hydrogen that water is used.Acticarbon can be removed rudimentary hydrocarbon or the oil vapour in the general hydrogen.Regulate the calibration cell water temperature and change the osmos tube seepage rate.In " zero point " air-flow (dry gas stream), add humidity in the general hydrogen scalable mixed airflow behind an amount of humidification by needle-valve.
3. dew point hygrometer: as the absolute humidity of measuring mixed gas.It is made up of the glass case of band ground, red copper sensing rod for temperature, copper-constantan thermocouple and the digital voltmeter of band minute surface.Because the accuracy of dew point hygrometer and the installation site of thermopair relation are greatly, require thermopair to press close to condensing surface.Traditional mode be thermopair is installed in the parallel via holes under the minute surface or with the copper plug thermopair tiltedly plug below minute surface.These method processing inconvenience, and be difficult for fixing.The utility model is at the following inclined hole of making a call to of minute surface, is positioned at the minute surface center at the bottom of the hole, and WU is welded in copper-constantan thermocouple in the inclined hole with weldering.This structure was not only easy for installation but also guaranteed measuring accuracy.
The utility model comprises that associated line and the parts between drying system, humidification system and the dew point hygrometer all are made of glass and stainless steel, and all connecting portions all adopt welding or screw to be tightly connected, to stop gas leakage.Whole device is installed in the constant temperature enclosure, guarantees that condition of work is relatively stable.
Accompanying drawing 1 is a gas process flow diagram of the present utility model.Wherein the parts in the frame of broken lines all are installed in the instrument container.It constitutes dynamic psychrometric calibrating installation of the present utility model together with all the other all parts.All component names are among the figure: 1. pure hydrogen bottle; 2. reduction valve; 3.5A and 3A molecule screen casing; 4. pressure maintaining valve; 5. Dewar container for liquefied nitrogen bottle; 6. stainless steel spiral cold-finger; 7. heat-exchange tube; 8. self-control dew point hygrometer; 9. copper-constantan thermocouple; 10. ice Dewar flask; 11.PZ8 type digital voltmeter; 12.WTK30-1 type needle-valve; 13. treat school hygrometric instrument or sensor, among this figure the aluminium oxide moisture sensor; 14. spinner-type flowmeter; 15. general hydrogen bottle; 16. acticarbon+HT-1 type catalyst tube; 17. osmos tube; 18. super constant temperature trough.
Accompanying drawing 2 is somes of the present utility model---the dew point method hygrometric device synoptic diagram of label 8-11 parts among Fig. 1.Among the figure: the 21.th, nozzle of air supply; 22. be the glass case; 23. be rubber stopper; 24. be the red copper sensing rod for temperature of band minute surface; 25. be the Dewar container for liquefied nitrogen bottle; 26. be copper-constantan thermocouple; 27. be digital voltmeter; 28. be U type glass tube; 29. be the frozen water Dewar flask.
The utility model uses hydrogen to make source of the gas, is easy to leak detection.Because the connecting portion sealing, safety also is out of question.Can certainly make source of the gas with other gas (as nitrogen etc.), but owing to can not use the liquid nitrogen frozen spiral pipe, the dry gas stream frost point is higher, it is high that the lower bound humidity of calibration is wanted.
The utility model adopt to be done, wet gas current once dilutes, and just can obtain the constant humidity air-flow of different humidity, both can obtain to hang down frost point, again humidification continuously.Structurally adopt the secondary dilution subtraction unit simple than at present more.
Use the utility model, can be at moisture instruments of humidity range internal calibration widely or moisture sensor, its dynamic calibration scope is-110 ℃～-20 ℃ frost points, is equivalent to 0.001～1000ppm, liquid water content.Use the dew point hygrometer in the utility model, to (containing P by high efficiency drier self-indicating
2O
3) liquid water content in (seeing Chinese patent CN86101504) dry gas measures, the dry back of its result and eighties drying agent of the same type in the world (Aquasorb that U.S. Mallinckrodt company produces) gas frost point is reduced to-96 ℃ and Soviet Union's chemistry handbook (first volume, p.52, Chinese edition) data of listing are (with P
2O
3On equilibrium water vapour pressure 2 * 10
-5MmHg is scaled the frost point value and is-96.6 ℃) unanimity; Carry out blank determination with other measuring methods (for example electrolytic Moisture Meter of Tangshan, Shanghai instrument production), the result coincide.These measurement results are listed in table 1.Table 2 is typical consequence of measuring moisture in all gases with the dew point hygrometer in the utility model.
Table 1 dew point hygrometer accuracy investigation result (dew point, ℃)
* be to represent consequently to be scaled the frost point value by the ppm value.
Table 2 dew point hygrometer is measured the typical consequence of moisture in all gases
Table 1 and table 2 result show that the measured result's of dew point hygrometer accuracy, sensitivity and repeatability all are gratifying in the utility model.
(for example, calibrate the aluminium oxide moisture sensor, can use the utility model device (Fig. 1) for moisture instruments or moisture sensor are calibrated.To be divided into two-way by the mixed airflow of drying system (3-7 among Fig. 1) and humidification system (16-18 among Fig. 1), measure the dew point (water cut) of one road mixed gas with dew point hygrometer (8 among Fig. 1), another road mixed airflow is by aluminium oxide moisture sensor (13 among Fig. 1), but a plurality of moisture sensors of serial or parallel connection are calibrated simultaneously.Because the mixed airflow of different moisture content is by moisture sensor, corresponding variation can take place in the capacitance of aluminium oxide moisture sensor or admittance value.The electric signal of moisture sensor when recording balance (capacitance or admittance value, the actual admittance value of using) is corresponding one by one with the dew point hygrometer measured value, thereby reaches the purpose of calibration.
Claims (2)
1, the utility model is the dynamic psychrometric calibrating installation, belongs to the test or the verification field of meteorological apparatus, it by the gas-drying system that comprises molecular sieve and liquid nitrogen frozen spiral pipe, comprise osmos tube etc. and form with the humidification system and the dew point hygrometer of calibration cell.Of the present utility model being characterised in that
(1) the molecule screen casing of gas-drying system and liquid nitrogen frozen spiral pipe arrangement mode are: the spiral pipe of 5A molecule screen casing-3A molecule screen casing-liquid nitrogen frozen.
(2) in the humidification system acticarbon+catalyst tube is arranged, catalyzer adopts HT-1 type catalyzer.
(3) in the dew point hygrometer, copper-constantan thermocouple is welded in the inclined hole under the minute surface, and the inclined hole bottom is positioned at the minute surface center.
2,, it is characterized in that the connection between gas-drying system, humidification system and the dew point hygrometer all adopts welding or screw to be tightly connected by the described dynamic psychrometric calibrating installation of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88211603 CN88211603U (en) | 1988-04-07 | 1988-04-07 | Calibrating apparatus of dynamic humidity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88211603 CN88211603U (en) | 1988-04-07 | 1988-04-07 | Calibrating apparatus of dynamic humidity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN88211603U true CN88211603U (en) | 1988-12-28 |
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ID=4844993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88211603 Withdrawn CN88211603U (en) | 1988-04-07 | 1988-04-07 | Calibrating apparatus of dynamic humidity |
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| Country | Link |
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| CN (1) | CN88211603U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949747A (en) * | 2010-09-03 | 2011-01-19 | 兰州交通大学 | Calibration measuring system and measuring method of dynamic response characteristic of humidity sensing element |
| CN102128860A (en) * | 2010-12-14 | 2011-07-20 | 中国人民解放军海军航空工程学院 | Dynamic parameter measuring system for humidity sensor |
| CN104950078A (en) * | 2015-06-04 | 2015-09-30 | 西安交通大学 | Flow wet steam humidity probe calibration device and method |
| CN105424750A (en) * | 2015-10-30 | 2016-03-23 | 长春气象仪器研究所 | Dew point transducer based on surface acoustic wave sensing element |
| CN105758990A (en) * | 2014-12-17 | 2016-07-13 | 国家电网公司 | Calibration system used for SF6 gas micro-water content detector in GIS |
| CN105974099A (en) * | 2016-07-19 | 2016-09-28 | 山东博硕电子有限公司 | Dynamic measuring calibration device for dinas moisture sensor |
| CN107991436A (en) * | 2017-11-22 | 2018-05-04 | 国家***第海洋研究所 | Suitable for the one-touch humidity sensor field calibration system and method for deep ocean buoy |
| CN111220775A (en) * | 2020-01-20 | 2020-06-02 | 中国特种设备检测研究院 | Saturated or supersaturated flue gas moisture content measurement calibrating device |
-
1988
- 1988-04-07 CN CN 88211603 patent/CN88211603U/en not_active Withdrawn
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949747A (en) * | 2010-09-03 | 2011-01-19 | 兰州交通大学 | Calibration measuring system and measuring method of dynamic response characteristic of humidity sensing element |
| CN101949747B (en) * | 2010-09-03 | 2011-11-16 | 兰州交通大学 | Calibration measuring system and measuring method of dynamic response characteristic of humidity sensing element |
| CN102128860A (en) * | 2010-12-14 | 2011-07-20 | 中国人民解放军海军航空工程学院 | Dynamic parameter measuring system for humidity sensor |
| CN105758990A (en) * | 2014-12-17 | 2016-07-13 | 国家电网公司 | Calibration system used for SF6 gas micro-water content detector in GIS |
| CN105758990B (en) * | 2014-12-17 | 2018-01-19 | 国家电网公司 | A kind of calibration system for being used for SF6 gas micro water content detectors in GIS |
| CN104950078A (en) * | 2015-06-04 | 2015-09-30 | 西安交通大学 | Flow wet steam humidity probe calibration device and method |
| CN105424750A (en) * | 2015-10-30 | 2016-03-23 | 长春气象仪器研究所 | Dew point transducer based on surface acoustic wave sensing element |
| CN105974099A (en) * | 2016-07-19 | 2016-09-28 | 山东博硕电子有限公司 | Dynamic measuring calibration device for dinas moisture sensor |
| CN107991436A (en) * | 2017-11-22 | 2018-05-04 | 国家***第海洋研究所 | Suitable for the one-touch humidity sensor field calibration system and method for deep ocean buoy |
| CN111220775A (en) * | 2020-01-20 | 2020-06-02 | 中国特种设备检测研究院 | Saturated or supersaturated flue gas moisture content measurement calibrating device |
| CN111220775B (en) * | 2020-01-20 | 2023-02-17 | 中国特种设备检测研究院 | Saturated or supersaturated flue gas moisture content measurement calibrating device |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |