CN102494738B - A kind of process circuit of photoelectric liquid-level instrument - Google Patents
A kind of process circuit of photoelectric liquid-level instrument Download PDFInfo
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- CN102494738B CN102494738B CN201110411606.0A CN201110411606A CN102494738B CN 102494738 B CN102494738 B CN 102494738B CN 201110411606 A CN201110411606 A CN 201110411606A CN 102494738 B CN102494738 B CN 102494738B
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- power supply
- analog switch
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- infraluminescence pipe
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- 239000007788 liquid Substances 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000001105 regulatory Effects 0.000 claims abstract description 18
- 230000000875 corresponding Effects 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 206010008531 Chills Diseases 0.000 description 1
- 238000005039 chemical industry Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000001131 transforming Effects 0.000 description 1
Abstract
The present invention is the process circuit of a kind of photoelectric liquid-level instrument.It includes power supply, regulated power supply, infraluminescence pipe array, luminous tube control unit, infrared receiving tube array, multiway analog switch, A/D transducer and processor, it is characterized in that: processor turns on luminous tube control unit, multiway analog switch and regulated power supply respectively, and the outfan of processor and multiway analog switch is turned on by A/D converter；The outfan of luminous tube control unit all turns on input every the branch road of infraluminescence pipe array, and infraluminescence pipe array connects regulated power supply；The input of multiway analog switch all turns on outfan every the branch road of infrared receiving tube array.This circuit low-power consumption, supply district width, have super error correction ability, and improve instrumentation performance sensing data, strengthens Meter Reliability.
Description
Technical field
The invention belongs to technical field of liquid level measurement, be the process circuit of a kind of photoelectric liquid-level instrument.
Background technology
Steel band tank gage is at present the most quite varied in application in oil product storage tank is measured, and use infrared photoelectric sensor mode in steel band tank gage is most.Infrared photoelectric sensor typically by one group of infraluminescence pipe, one group of infrared receiving tube be clipped in luminous tube and receive between pipe and form with printing opacity rustless steel Gray code band or Gray's code-disc of liquid level linkage, luminous tube with receive pipe position one_to_one corresponding.Common implementation method all of luminous tube is connected after by constant-current source driven for emitting lights, receive pipe by the pullup or pulldown resistance outfan level IO to gate circuit or CPU after, be converted to level value according to the logical data of device recognition.There are the following problems for the method: one is apolegamy guard grating difficulty.Owing to using luminous tube tandem working mode, it is ensured that luminous tube normally works, higher to instrument power supply voltage request, and power consumption is the biggest.Some meter type require that power supply cannot be below 20V, instrument after improvement have employed the one group of series connection of every 5 luminous tubes, and supply voltage requires to decrease, but Overall Power Consumption is the biggest, for using at the intrinsic safety type instrument of petroleum chemical industry, common guard grating is difficult to meet.Its two logical data is error-prone.Owing to the logic level identification of gate circuit or the IO of CPU requires palpus < 0.3Vcc
Or > 0.7Vcc, and it is all uncertain in the logical judgment of the voltage input end of (0.3 ~ 0.7) Vcc, this just requires infraluminescence and receives logic and mate very strictly, otherwise can cause the data jump of tank gage.Its three maintenance is big and long-time performance reduces.Meter locale works for a long time and makes to send out the reduction of light receiving tube performance, and the impact of stain on printing opacity code band and run location deviation all can cause logic level undesirable and cause error in data, thus affect instrumentation detection, increase the working strength of field maintenance person.
Summary of the invention
It is an object of the invention to provide the process circuit of a kind of photoelectric liquid-level instrument, this circuit low-power consumption, supply district width, have super error correction ability, and have raising instrumentation performance sensing data, strengthen Meter Reliability, the advantage reducing the labor intensity of Field Force.
The technical scheme is that the process circuit of a kind of photoelectric liquid-level instrument, it includes power supply, regulated power supply, infraluminescence pipe array, luminous tube control unit, infrared receiving tube array, multiway analog switch, A/D transducer and processor, it is characterized in that: processor turns on luminous tube control unit, multiway analog switch and regulated power supply respectively, and the outfan of processor and multiway analog switch is turned on by A/D transducer；The outfan of luminous tube control unit all turns on input every the branch road of infraluminescence pipe array, and infraluminescence pipe array connects regulated power supply；The input of multiway analog switch all turns on outfan every the branch road of infrared receiving tube array；Infraluminescence pipe array and every passage one_to_one corresponding of infrared receiving tube array；Regulated power supply, infrared receiving tube array and processor are powered by power supply.
Described regulated power supply is constant-current source or the constant pressure source of adjustable voltage output of adjustable current output.
In described infraluminescence pipe array, every branch road is parallel, and every branch road has independent infraluminescence pipe a current-limiting resistance of connecting.
Described luminous tube control unit is serial parallel switching device or multiway analog switch device.
Described processor stores default threshold voltage.
The invention have the characteristics that 1, the power consumption of circuit is substantially reduced, and < 20mW, relaxes power consumption to system power supply voltage request, lays a good foundation for two-wire system instrument；The reduction of circuit power consumption, has adapted to instrument to more barrier select.
2, when circuit uses intermittent duty, average power consumption can be lower, it is adaptable in more equipment.
3, the raising of data-handling capacity, remains to normally detect to the most undesirable logic level, has stronger error correction capability.
4, rigors and the process costs of device are reduced；The health of diagnosable instrument self-sensor device and sub-health state, carry out field maintenance and replacing in advance；Reduce the maintenance labor intensity of field personnel.
Accompanying drawing explanation
Below in conjunction with embodiment, the present invention is further illustrated.
Fig. 1 is the structural representation processing circuit of photoelectric liquid-level instrument.
In figure: 1, power supply；2, regulated power supply；3, infraluminescence pipe array；4, luminous tube control unit；5, infrared receiving tube array；6, multiway analog switch；7, A/D transducer；8, processor.
Detailed description of the invention
As shown in Fig. 1, power supply 1 all turns on regulated power supply 2, infrared receiving tube array 5 and processor 8, and whole circuit is powered by power supply 1 by the voltage that the Width funtion input of external power source is converted into 3.3V.
Regulated power supply 2 is adjustable voltage output type, turn on power supply 1, infraluminescence pipe array 3 and processor 8, the input voltage of regulated power supply 2 is provided by power supply 1, the output voltage of infraluminescence pipe array 3 is controlled by regulated power supply 2 by processor 8, the luminous intensity of its output voltage adjustable infraluminescence pipe array 3 mid-infrared luminous tube.
The outfan of luminous tube control unit 4 all turns on input every the branch road of infraluminescence pipe array 3, and in infraluminescence pipe array 3, every branch road is the most parallel, and every branch road has independent infraluminescence pipe a current-limiting resistance of connecting.Every branch road of infraluminescence pipe array 3 is all opened or closed individually control by what the serial parallel of luminous tube control unit 4 was changed.
Infraluminescence pipe array 3 and every passage one_to_one corresponding of infrared receiving tube array 5, the input of multiway analog switch 6 all turns on outfan every the branch road of infrared receiving tube array 5, the outfan of multiway analog switch 6 is turned on processor 8 by A/D converter 7, the branch road of multiway analog switch 6 also directly turns on processor 8, stores default threshold voltage in processor 8.
During work, the situation of every infraluminescence every the branch road of pipe array 3 opened or closed is selected according to luminous tube control unit 4, multichannel analog switch 6 selects the output level of the infrared receiving tube of passage corresponding with luminous tube simultaneously, changed by A/D transducer 7, transformation result compares with the threshold level preset, and obtains the logical data of this passage；Select the luminous tube opened successively and process receiving tube voltage output thus obtaining each single pass logical data corresponding with liquid level of correspondence, and being converted to liquid level data.
Degree of closeness to channel sampled data Yu threshold voltage in test process, with the state quality of the work of diagnostic instrument quantitatively, carry out instrument maintenance and replacing in time, strengthen the reliability of liquid level control system, this circuit low-power consumption, supply district width, have super error correction ability to sensing data simultaneously.
The electrical components such as infraluminescence pipe, A/D transducer are all that this area is commonly used, and the distribution road of this circuit and distribution components are all commonly used in the art, do not do particularly explanation at this.
Claims (2)
1. the process circuit of a photoelectric liquid-level instrument, it includes power supply, regulated power supply, infraluminescence pipe array, luminous tube control unit, infrared receiving tube array, multiway analog switch, A/D transducer and processor, it is characterized in that: processor turns on luminous tube control unit, multiway analog switch and regulated power supply respectively, and the outfan of processor and multiway analog switch is turned on by A/D transducer；The outfan of luminous tube control unit all turns on input every the branch road of infraluminescence pipe array, and infraluminescence pipe array connects regulated power supply；The input of multiway analog switch all turns on outfan every the branch road of infrared receiving tube array；Infraluminescence pipe array and every passage one_to_one corresponding of infrared receiving tube array；Regulated power supply, infrared receiving tube array and processor are powered by power supply；Described regulated power supply is constant-current source or the constant pressure source of adjustable voltage output of adjustable current output；In described infraluminescence pipe array, every branch road is parallel, and every branch road has independent infraluminescence pipe a current-limiting resistance of connecting；Described luminous tube control unit is serial parallel switching device or multiway analog switch device.
2. according to the process circuit of a kind of photoelectric liquid-level instrument described in claim 1, it is characterized in that: described processor stores default threshold voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110411606.0A CN102494738B (en) | 2011-12-12 | A kind of process circuit of photoelectric liquid-level instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110411606.0A CN102494738B (en) | 2011-12-12 | A kind of process circuit of photoelectric liquid-level instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102494738A CN102494738A (en) | 2012-06-13 |
| CN102494738B true CN102494738B (en) | 2016-12-14 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2055612U (en) * | 1989-08-09 | 1990-04-04 | 马伯云 | Intelligence liquid level automatic controll instrument |
| CN2634446Y (en) * | 2003-07-04 | 2004-08-18 | 上海航天汽车机电股份有限公司 | Circuit for integrated photoelectric liquid sensor |
| CN201237507Y (en) * | 2008-03-17 | 2009-05-13 | 翟允正 | Dual-absolute value optoelectronic encoding liquid level temperature transmitter |
| CN201724706U (en) * | 2010-07-23 | 2011-01-26 | 北京博瑞特自动计量系统股份有限公司 | Oil discharge safety monitor |
| CN102162747A (en) * | 2010-12-26 | 2011-08-24 | 河海大学常州校区 | Signal processing circuit for photoelectric sensor |
| CN202433058U (en) * | 2011-12-12 | 2012-09-12 | 河北珠峰仪器仪表设备有限公司 | Processing circuit of photoelectric liquid level meter |
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2055612U (en) * | 1989-08-09 | 1990-04-04 | 马伯云 | Intelligence liquid level automatic controll instrument |
| CN2634446Y (en) * | 2003-07-04 | 2004-08-18 | 上海航天汽车机电股份有限公司 | Circuit for integrated photoelectric liquid sensor |
| CN201237507Y (en) * | 2008-03-17 | 2009-05-13 | 翟允正 | Dual-absolute value optoelectronic encoding liquid level temperature transmitter |
| CN201724706U (en) * | 2010-07-23 | 2011-01-26 | 北京博瑞特自动计量系统股份有限公司 | Oil discharge safety monitor |
| CN102162747A (en) * | 2010-12-26 | 2011-08-24 | 河海大学常州校区 | Signal processing circuit for photoelectric sensor |
| CN202433058U (en) * | 2011-12-12 | 2012-09-12 | 河北珠峰仪器仪表设备有限公司 | Processing circuit of photoelectric liquid level meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20120904 Address after: The eastern city of Handan province Hebei Xuechi road 056005 Applicant after: Hebei Zhufeng Instrument & Meter Co., Ltd. Address before: 710077, building 1, Residence Du Commerce, 69 Kam Yip Road, hi tech Zone, Shaanxi, Xi'an Applicant before: Xi'an Fuan Innovation Consultation Co., Ltd. |
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| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 056600 west section of Gucheng Road, Linzhang County, Handan, Hebei Patentee after: Hebei Zhufeng Instrument & Meter Co., Ltd. Address before: 056005 eastern section of snow road, Handan, Hebei Patentee before: Hebei Zhufeng Instrument & Meter Co., Ltd. |