CN2190786Y - Inteligent dry and wet ball temperature and wetness measuring device - Google Patents
Inteligent dry and wet ball temperature and wetness measuring device Download PDFInfo
- Publication number
- CN2190786Y CN2190786Y CN 94225951 CN94225951U CN2190786Y CN 2190786 Y CN2190786 Y CN 2190786Y CN 94225951 CN94225951 CN 94225951 CN 94225951 U CN94225951 U CN 94225951U CN 2190786 Y CN2190786 Y CN 2190786Y
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- temperature
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- central control
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- wet
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Abstract
The utility model relates to an intelligent dry and wet ball temperature and wetness measuring device, which is composed of a dry and wet ball sensing device, a corresponding electronic circuit, a microcomputer and a display. The utility model is characterized in that the dampness values in a wide range of temperature (-10 DEG C-+80 DEG C) can be directly indicated in time, and an interface is prepared for providing conditions for realizing temperature and wetness control, automatic alarm, extreme value displaying, etc. for relevant production and laboratories. Owing to high accuracy, the utility model can be used as a convenient and simple site high temperature and wetness measuring calibration instrument. The device has a compact and reasonable structure, small size and portability, and is an ideal intelligent wetness measuring device particularly used for high temperature and wetness production, such as tobacco roasting and fruit slices baking.
Description
The warm and humid measurement mechanism of a kind of intelligent wet and dry bulb.
The production site of many high temperature low humidities.(as the tobacco flue-curing chamber, chankings drying chamber etc.) and some hot and humid experiments place, relative air humidity when needing measure field temperature+more than 45 ℃, with control flow and improving the quality of products, existing psychrometer measurement is only limited to the air humidity below 45 ℃, and be temperature measured value, look into by " meteorological table--psychrometric table " and calculate relative humidity that this table for reference also only limits in 49.9 ℃ by wet and dry bulb.Obviously thisly manually look into cumbersomely, do not meet the real-time requirement again, input to the computing machine that can calculate humidity by the humidity computing formula though also the wet and dry bulb temperature value that records can be changed hands, real-time is poor like this, and efficient is low, cost height, also inconvenience.The existing Z80 single card microcomputer that utilizes, the humidity value of listing by the temperature-measuring range that limits below 45 ℃ in the above-mentioned psychrometric table is weaved into complicated difference form write memory, try to achieve the method for humidity value again by look-up routine according to the wet and dry bulb temperature value, not only committed memory is many, and speed is slow, and error is bigger, temperature-measuring range is narrow, can not satisfy the technical requirement of high temperature hygrometric, Z80 single card microcomputer volume big accessory is many, is unsuitable for to make the wet instrument of small-sized dynamical intelligent thermometric.
The purpose of this utility model is to overcome above shortcoming provides a kind of intelligence warm and humid measurement mechanism, can not only in wide region, directly provide the humiture value in real time, make data acquisition, calculating and output in real time are integrated, and can be to realize warm and humid control and relevant creation necessary conditions (being provided with corresponding interface) such as automatic warning in the technological process in relevant production place.
In view of the measurement with wet hygrometric is that internationally recognized secondary standard is surveyed method, it is higher that another purpose of the present utility model provides a kind of precision, the on-the-spot hygrometric standard device (particularly under the high-temperature condition) of simple and convenient is to make things convenient for employed his class (as lithium chloride etc.) hygrometric instrument of user.
For the ease of understanding and implement, concise and to the point narrate that its calculation and programming and overall the setting are necessary.
The utility model has selected for use precision sufficiently high, and Rockwell (lowe) polynomial expression of not only simple but also suitable this type Microcomputer Calculation is as the basic form that calculates humidity.This polynomial expression with the Ge Fu (coff) that generally acknowledges in the world though very accurate but formula calculation of complex compare, error very I ignore (in-10 ℃ of-+80 ℃ of scopes only for ± 0.01hpa).Rockwell calculated level face saturation vapour pressure polynomial expression is:
e
w＝C
0＋C
1T＋C
2T
2＋C
3T
3＋C
4T
4＋C
5T
5＋C
6T
6……（1）
Wherein: e
wBe the saturation vapour pressure (hpa) of surface level, T be temperature (℃)
C
0To C
6Known constant
Ask in the meteorology and calculate Environmental Water vapour pressure e(hpa) formula be:
e＝e′
w－0.799×（T－T′）……（2）
E ' in the formula
wBe the wet-bulb temperature saturation vapour pressure in T ' time.
Relative temperature then:
R＝ (e)/(e
w) ×100％……（3）
Obviously, utilization (1) to (3) formula just can be tried to achieve relative humidity R recording wet and dry bulb temperature T and T ' time.Central control unit of the present utility model (17) adopts 8031 single-chip microcomputers of MCS-51 series to calculate specially, in view of the figure place of (1) formula discipline numerical value a lot, therefore selected for use three byte floating numbers to improve arithmetic speed and real-time, used the MBASIC-51 compiling type higher level lanquage of high-speed and high-efficiency again, the hygrometer of (1) to (3) formula has been programmed.Watchdog routine after the programming is solidificated in the EPROM memory of 8031 one chip microcomputers, shows in real time with control sampling computing with by display.In addition, also be provided with the extreme value button especially, can be implemented in the demonstration of the humiture extreme value that occurs during the thermometric degree, also have interface, can realize functions such as the warm and humid automatic control of customer requirements and warning by the instruction of the inquiry button of 8031 single-chip microcomputers.
Concrete structure of the present utility model is provided in detail by following examples and accompanying drawing thereof
Fig. 1 general structure block scheme of the present utility model
Fig. 2 wet and dry bulb sensing device structure cut-away view
Wherein, 1, cable plug; 2, shielded cable and lead-in wire; 3, sheath; 4, dry bulb platinum resistance; 5, wet bulb platinum resistance; 6, pillar; 7, gauze; 8, container; 9, cover plate; 10, distilled water; 11, dry bulb bridge for measuring temperature; 12, wet bulb bridge for measuring temperature; 13, multi-channel analog switch; 14, measuring amplifier; 15, A/D converter; 16, I/O interface; 17, central control unit; 18, extreme value display button; 19, temperature humidity display; 20, D.C. regulated power supply; 21, supply convertor; 22, input/output function interface.
As shown in Figure 1, this device is formed by following unit construction; Sensing device is mainly by two platinum resistance temperature-sensing elements that specification is identical--and dry bulb platinum resistance 4 and wet bulb platinum resistance 5 constitute; Two bridge for measuring temperature 11,12 that structure is identical, and above-mentioned dry bulb platinum resistance 4 and wet bulb platinum resistance 5 are respectively its gage beam; A multi-channel analog switch 13 receives the voltage temperature signal of bridge for measuring temperature 11,12 outputs, and is subjected to central control unit 17 controls, the output terminal S of analog multiplexer 13
0Timesharing output wet and dry bulb temperature signal; A high precision operating amplifier 14, its input end and S
0Connect, export A/D converter 15 to through amplification; An I/O interface 16 of being made up of 8155 parallel interfaces is changed the data bus that back 8 position digital signals input to central control unit 17 again with A/D; A central control unit 17 with above-mentioned wet and dry bulb temperature data sampling after, be converted to corresponding dry-bulb temperature value and relative humidity value through mathematics manipulation; An extreme value display button 8 is connected with above-mentioned central control unit 17; A temperature humidity display 19 of being made up of 6 LED charactrons is joined with central control unit 17 by parallel I/O interface 16; One has the input/output function interface 22 of reporting to the police with warm and humid automatic control function also joins with central control unit; D.C. regulated power supply 21 and supply convertor 22 provide respectively+5V and-5V voltage is to foregoing circuit.
The utility model of finishing according to Fig. 1 setting is intelligent warm and humid measurement mechanism.Central control unit 17 is 8031 single-chip microcomputers of a MCS-51 series, export 6 figure place sign indicating number temperature humidity display 19 to via I/O interface 16, low 2 bit digital display wherein shows relative temperature value R, and high group of four figures pipe shows ten, individual and decimal place value of sign and temperature.The control signal of extreme value display button 18 is input to 8031 single-chip microcomputers, by its CPU inquiry control, is presented at maximum temperature and the humidity value that measurement occurs therebetween by next at any time, with the supervision technological process.
As shown in Figure 2, the sensor that above-mentioned sensing device is provided with is done, the solid frame of the terminals of wet bulb platinum resistance 4,5 joins in sheath 3 both sides of a column with chamber and with lead-in wire 2, the pillar 6 that supports sheath 3 is fixed on the cover plate 9 of cylindrical vessel 8, gauze 7 is wrapped on the platinum resistance 6, and immerse via the aperture on the cover plate 9, in the aquae destillata 10.Lead-in wire in the cable plug 1 connects wet and dry bulb platinum resistance 4,5 and wet and dry bulb bridge for measuring temperature 11,12 respectively, whether container 8 and cover plate 9 are become as organic glass by transparent plastic, have to observe aquae destillata, this sensing device both can hang, again arbitrarily on the placed mesa.
In sum, the utility model has the advantages that conspicuously, not only can between-10 ℃-+80 ℃, accurately provide corresponding humidity value in real time, but also can conveniently calibrate the high warm and humid surveying instrument of other types.In addition, this device also has the input and output versatile interface of reporting to the police with automatic control, greatly facilitate the metering of user to warm and humid parameter, show, calibrate and control, be a desirable high efficiency smart hygrometric device in fact, particularly solved warm and humid metering, and provide possibility for the accurate control of its production procedure in high temperature wet production and experiment place.
Claims (2)
1, the warm and humid measurement mechanism of a kind of intelligent wet and dry bulb, it comprises sensor, corresponding electronic circuit and central control unit [1] is characterized in that
A) the sensor wet and dry bulb platinum resistance [4 that is provided with of sensing device, 5] the solid frame of terminals is column sheath [3] both sides with chamber, and with the lead-in wire [2] join, the pillar that supports sheath [3] is fixed on the cover plate [9] of cylindrical vessel [8], gauze 7 is wrapped on the platinum resistance [6], and the aperture on cover plate [9] immerses in the distilled water [10].
B) central control unit [17] exports on the 6 figure place sign indicating number temperature humidity display [19] via I/O interface [16], extreme value display button [18] is joined with central control unit [17], and by its CPU inquiry control, input/output function interface [22] also is connected with above-mentioned central control unit [17].
2, device according to claim 1 is characterized in that above-mentioned central control unit (17) is 8031 single-chip microcomputers of a MCS-51 series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94225951 CN2190786Y (en) | 1994-03-10 | 1994-03-10 | Inteligent dry and wet ball temperature and wetness measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94225951 CN2190786Y (en) | 1994-03-10 | 1994-03-10 | Inteligent dry and wet ball temperature and wetness measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2190786Y true CN2190786Y (en) | 1995-03-01 |
Family
ID=33839032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94225951 Expired - Fee Related CN2190786Y (en) | 1994-03-10 | 1994-03-10 | Inteligent dry and wet ball temperature and wetness measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2190786Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108508941A (en) * | 2017-02-28 | 2018-09-07 | 铁木真电子科技（昆山）有限公司 | A kind of temperature and humidity controller based on LPC1768 |
| CN114166264A (en) * | 2021-12-08 | 2022-03-11 | 西南大学 | Bulk curing barn dry-wet ball temperature sensor detector and detection method thereof |
-
1994
- 1994-03-10 CN CN 94225951 patent/CN2190786Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108508941A (en) * | 2017-02-28 | 2018-09-07 | 铁木真电子科技（昆山）有限公司 | A kind of temperature and humidity controller based on LPC1768 |
| CN114166264A (en) * | 2021-12-08 | 2022-03-11 | 西南大学 | Bulk curing barn dry-wet ball temperature sensor detector and detection method thereof |
| CN114166264B (en) * | 2021-12-08 | 2022-08-02 | 西南大学 | Bulk curing barn dry-wet ball temperature sensor detector and detection method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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 |