CN1101129A - Instrument for detecting pressure leak source - Google Patents
Instrument for detecting pressure leak source Download PDFInfo
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- CN1101129A CN1101129A CN 94100371 CN94100371A CN1101129A CN 1101129 A CN1101129 A CN 1101129A CN 94100371 CN94100371 CN 94100371 CN 94100371 A CN94100371 A CN 94100371A CN 1101129 A CN1101129 A CN 1101129A
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- pressure
- instrument
- leak source
- dew
- dew point
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Abstract
The present invention relates to a pressure dew-point detector. It is used for directly measuring and continuously displaying dew-point of pressure gas phase, and in which the direct measuring device of pressure gas phase consists of pressure sensor, temp. sensor, moisture sensitive element and single-chip microcomputer. Said invention belongs to an intelligent instrument, and is suitably developed into a dual-purpose instrument for monitoring and controlling dew-point, and can be popularized, and can changeably use a real-time control technique so as to raise the working efficiency of gas source device.
Description
A kind of instrument for detecting pressure leak source relates to the instrument of detected pressures dew point.
In the existing dew point meter device, " direct viewing type detector ", " portable dew point hygrometer " and " digital micro-moisture instrument " are arranged.The aufbauprinciple of these instruments has nothing in common with each other, and what the former adopted is that the mist method is coagulated in refrigeration, the latter two employings be respectively that thermal insulation is splashed to expand and coagulated mist method and moisture absorption electrolytic process.Their characteristics are that intuitive is strong, and using method is easily grasped, but operation steps is many, and length consuming time need to be equipped with refrigerant or hygroscopic agent or calculation chart etc., and daily servicing is loaded down with trivial details, and workload is big, and the direct dew point of gaging pressure gas phase.
The objective of the invention is generally to adopt timer control at present air drying equipment, energy-conservation unfavorable situation, design intelligent pressure gas phase dew point detecting instrument,, use operating mode control in real time instead for air drying equipment and create conditions to simplify dew point testing work.
For reaching this purpose, technical solution of the present invention is: adopts pressure sensor, and temperature sensor, humidity-sensitive element and one chip microcomputer constitute the direct measurement mechanism to pressure leak source, are used for directly measuring and showing continuously the dew point of pressure gas phase.Sensor wherein, analog quantity amplification treatment circuit, A/D converter and one chip microcomputer constitute detection system of the present invention.Three sensors wherein, the non electrical quantities such as pressure, temperature, humidity and relative humidity at place, measured point are become electric weight, these electric weight insert main frame through transmission line, being exaggerated device earlier amplifies, then carry out the A/D conversion by the MUX gating, transformation result enters one chip microcomputer and carries out computing, converses corresponding dew points at normal pressure and pressure leak source, and from the output of I/O parallel interface, at last by showing that decoding scheme shows operation result.At above-mentioned calculating process, memory provides required program of computing and data.
One chip microcomputer in the technology of the present invention solution is according to the response of sensor to pressure, temperature and three parameters of relative humidity at place, measured point, computing dew points at normal pressure and pressure leak source.
When the one chip microcomputer in the technology of the present invention solution carries out computing to pressure, temperature, humidity and the relative humidity of tested gas phase, can recompense to the temperature drift of humidity-sensitive element according to temperature conditions.
The present invention compared with prior art has following advantage:
1. the apparatus structure novelty is easy to use.The present invention is made of sensor and one chip microcomputer, and equipment which requires cooling, refrigerant, hygroscopic agent and look into auxiliary appliance such as nomogram table not need not sampling yet.
2. but instrument long-time running of the present invention, Continuous Tracking shows the gas phase dew point.Because the microsystem of this instrument has adopted multinomial interference protection measure, makes instrument work very stable, show accurately and reliably.
3. instrument does not need special care and maintenance.
4. because the present invention is intelligent instrument, directly the reaction pressure dew point responds soon, the suitable dew point real-time controller that is developed to.
Now in conjunction with the accompanying drawings embodiments of the invention are further described.
Fig. 1, instrument for detecting pressure leak source principle of work block scheme, among the figure, I-sensor groups, II-main frame; The 1-pressure transducer, 2-temperature sensor, 3-humidity sensor, 4-MUX, 5-A/D converter, 6-demonstration/decoding, 7-I/O parallel interface, 8-one chip microcomputer, 9-memory, A-amplifier.
Fig. 2, model machine panel figure.Among the figure, 10-pressure display screen, 11-temperature display, 12-dew points at normal pressure display screen, 13-pressure leak source display screen, 14-power switch, 15-adjustment/mode of operation selector switch, 16-relative humidity (dew point) full scale correction hole, 17-relative humidity (dew point) zero correction hole.
Fig. 3, simulated measurement input circuit figure, among the figure, V1-pressure output voltage, V2-temperature output voltage, V3-relative humidity output voltage; W1-1-pressure full scale is adjusted potentiometer, W1-2 pressure zero potentiometer, and W2-1-temperature zero potentiometer, W2-2 humidity full scale is adjusted potentiometer, W3-1 relative humidity (dew point) zero potentiometer, W3-2-relative humidity (dew point) full scale is adjusted potentiometer.
As shown in Figure 1 to Figure 3, during instrument work, three sensors (1,2,3) the pressure at place, measured point, non electrical quantity such as temperature and relative humidity is transformed into electric weight, these electric weight insert main frame (II) through three groups of transmission lines, the amplifier A that is specially configured amplifies, then, three road signals are imported MUX (4) gating simultaneously, enter A/D converter (5) successively, and transformation result enters one chip microcomputer (8), make complex calculations by CPU according to these three parameters, converse corresponding dew points at normal pressure and pressure leak source value, and, show operation result by demonstration/decoding (6) circuit at last from I/O parallel interface (7) output.In above-mentioned calculating process, memory (9) provides computing necessary programs and data respectively.
In simulated measurement input circuit of the present invention, the change of three sensors send output characteristics into: input pressure when 0～0.8MPa, corresponding output voltage V 1 is 0～1600MV; Relative humidity is when 0～70%RH, and corresponding output voltage V 3 is 0～1600MV; Temperature is in the time of 0～+ 50 ℃, and corresponding output voltage V 2 is 0～1000MV.The power supply that instrument uses is AC220V, 50HZ; Working environment: temperature 0～+ 50 ℃; Measurement range and error: pressure≤0.004MPa(0～0.8MPa), resolution is 0.001MPa; Temperature≤0.3 ℃ (0～+ 50 ℃), resolution is 0.1 ℃; Dewpoint temperature≤3 ℃ (49.9 ℃～+ 10 ℃), resolution is 0.1 ℃.
Implement when of the present invention, with connector sensing probe is inserted by measuring pressure gas phase pipeline earlier, power-on 20～30 minutes after data to be shown tend towards stability, can be made formal reading.Then, by adjustment/operating switch (15), when " operation " state, data are respectively the pressure of tested gas phase, temperature, dew points at normal pressure and pressure leak source shown in four display screens (10,11,12,13); When " adjustment " position, display screen only shows the temperature and the relative humidity (%RH) of gas phase, and (the same display screen of relative humidity and dew points at normal pressure) used when this state supplies to rectify an instrument.Timing utilizes relative humidity (dew point) full scale correction hole (16) and relative humidity (dew point) zero correction hole (17) to come the dew point reading of calibration instrument, uses at ordinary times to need not to touch, and shows accurately and reliably to guarantee instrument.
Dew points at normal pressure that the present invention is shown and pressure leak source lower limit only are taken to-49.9 ℃, and when the gas phase dew point is lower than-49.9 ℃, the display screen reading will show " 88.8 ", at this moment, show that corresponding project dew point value is below-50 °.
Claims (3)
1, a kind of pressure leak source testing instrument has the dew point of air drying equipment is measured member, and it is characterized in that: pressure transducer, humidity sensor, humidity-sensitive element and one chip microcomputer constitute direct measurement and the display device to pressure gas phase dew point.
2, instrument for detecting pressure leak source according to claim 1 is characterized in that: one chip microcomputer is according to the pressure of sensor groups to the place, measured point, the response of temperature and three parameters of relative humidity, the dew points at normal pressure and the pressure leak source of computing pressure gas phase.
3, instrument for detecting pressure leak source according to claim 1 and 2 is characterized in that: one chip microcomputer has compensating action to the temperature drift of humidity-sensitive element when the computing dew point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94100371 CN1101129A (en) | 1994-01-06 | 1994-01-06 | Instrument for detecting pressure leak source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94100371 CN1101129A (en) | 1994-01-06 | 1994-01-06 | Instrument for detecting pressure leak source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1101129A true CN1101129A (en) | 1995-04-05 |
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ID=5029604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94100371 Pending CN1101129A (en) | 1994-01-06 | 1994-01-06 | Instrument for detecting pressure leak source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1101129A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101641591B (en) * | 2007-04-04 | 2011-11-09 | 爱斯佩克株式会社 | Hygrometer, and dew-point instrument |
| CN104048697A (en) * | 2014-05-28 | 2014-09-17 | 上海朋皆欣自动化科技有限公司 | Environmental parameter detector |
| CN104950957A (en) * | 2014-03-28 | 2015-09-30 | 上海爱斯佩克环境设备有限公司 | Display and control method for reconversion of relative humidity |
| CN111551586A (en) * | 2020-06-19 | 2020-08-18 | 广州能源检测研究院 | Compressed air pressure dew point detection device and method |
-
1994
- 1994-01-06 CN CN 94100371 patent/CN1101129A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101641591B (en) * | 2007-04-04 | 2011-11-09 | 爱斯佩克株式会社 | Hygrometer, and dew-point instrument |
| CN104950957A (en) * | 2014-03-28 | 2015-09-30 | 上海爱斯佩克环境设备有限公司 | Display and control method for reconversion of relative humidity |
| CN104950957B (en) * | 2014-03-28 | 2017-05-24 | 上海爱斯佩克环境设备有限公司 | Display and control method for reconversion of relative humidity |
| CN104048697A (en) * | 2014-05-28 | 2014-09-17 | 上海朋皆欣自动化科技有限公司 | Environmental parameter detector |
| CN111551586A (en) * | 2020-06-19 | 2020-08-18 | 广州能源检测研究院 | Compressed air pressure dew point detection device and method |
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