CN102235898A - Sensing device for liquid level sensor - Google Patents
Sensing device for liquid level sensor Download PDFInfo
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- CN102235898A CN102235898A CN 201010157341 CN201010157341A CN102235898A CN 102235898 A CN102235898 A CN 102235898A CN 201010157341 CN201010157341 CN 201010157341 CN 201010157341 A CN201010157341 A CN 201010157341A CN 102235898 A CN102235898 A CN 102235898A
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- level sensor
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Abstract
The invention relates to a sensing device for a liquid level sensor. The sensing device comprises a device top cap. The sensing device is characterized in that: a processor is arranged in the device top cap, and the input end of the processor is connected with the output end of a linear Hall sensor. Meanwhile, the output end of the processor is connected with the input end of an analog switch module, and the output end of the analog switch module is connected with resistors of different resistances to form a resistor set. Moreover, a communication bus is connected to the communication port of the processor. Therefore, the linear Hall sensor for sensing the change of the magnetic field is matched with a singlechip to measure the volume of the stored solution of a container, and a conductive medium in contact with the liquid does not exist.
Description
Technical field
The present invention relates to a kind of sensing device, relate in particular to a kind of liquid level sensor sensing device.
Background technology
Just many in the market liquid level sensors of generally selling, no matter be resistance-type level transducer or capacitance level transducer, all need conducting medium and insert in the liquid, and in order to increase accuracy of detection, conducting medium must be higher than liquid level variation height.Because the occasion that this class sensor uses is very many, and the container of its carrying liquid also has nothing in common with each other, thus the length of the conducting medium of using also have nothing in common with each other, thereby make this type of sensor all need the process of a demarcation.
But the calibration process of existing apparatus is comparatively complicated in case the data of record have a point tolerance, will cause the detected data of this liquid level sensor inaccurate.
In addition on the one hand, no matter be resistance-type level transducer or capacitance level transducer, all need conducting medium and contact with liquid.This class liquid level sensor is widely used in fuel oil or the liquefied gas, and the fault in case circuit is short-circuited produces Mars, and consequence is with hardly imaginable.
Summary of the invention
The objective of the invention is to overcome the above problem that prior art exists, a kind of liquid level sensor sensing device is provided.
For realizing a kind of liquid level sensor sensing device of purpose of the present invention, include the device top cover, wherein: be provided with processor in the described device top cover, the input end of processor is connected with the output terminal of linear hall sensor; The output terminal of described processor connects the input end of simulation switch module; The output terminal of described analog switch module is connected with the resistor group that different resistance resistance constitute; Be connected with communication bus on the communication port of described processor.
Further, above-mentioned a kind of liquid level sensor sensing device wherein, is connected with filtration module on the output terminal of described linear hall sensor, and the output terminal of filtration module is connected into the input end of processor.
Further, above-mentioned a kind of liquid level sensor sensing device, wherein, described processor is a single-chip microcomputer, the input end of single-chip microcomputer is provided with and adds switched pins.
Again further, above-mentioned a kind of liquid level sensor sensing device, wherein, described communication bus is a digital communication bus.
Adopt technical solution of the present invention, can cooperate single-chip microcomputer to carry out the measurement of containers store solution quantity, do not have the conducting medium that contacts with liquid by the variation that linear hall sensor is experienced magnetic field.And, by the different resistance of Single-chip Controlling analog switch module gating, the numerical value that can further accurately measure.
Purpose of the present invention, advantage and characteristics will illustrate by the non-limitative illustration of following preferential embodiment and explain that these embodiment only provide as an example with reference to accompanying drawing.
Description of drawings
Fig. 1 is the organigram of this liquid level sensor with sensing device
The implication of each Reference numeral is as follows among the figure:
1 device top cover, 2 linear hall sensors
3 analog switch modules, 4 resistance
5 single-chip microcomputers 6 add switched pins
7 digital communication bus, 8 filtration modules
Embodiment
A kind of liquid level sensor sensing device as shown in Figure 1 includes device top cover 1, its unusual being: be provided with processor in the described device top cover 1, the input end of processor is connected with the output terminal of linear hall sensor 2.Simultaneously, the output terminal of this processor connects the input end of simulation switch module 3.Further, the output terminal of described analog switch module 3 is connected with 4 groups of the resistance that different resistance resistance 4 constitute.And, consider that invention can better carry out active data with external device (ED) and communicate by letter, on the communication port of processor, be connected with communication bus.
In conjunction with the present invention's one preferred implementation, on the output terminal of linear hall sensor 2, be connected with filtration module 8, the output terminal of filtration module 8 is connected into the input end of processor.Simultaneously, processor adopting single-chip microcomputer 5, the input end of single-chip microcomputer 5 is provided with A/D switched pins 6.Thus, in case linear hall sensor 2 work back produces voltage signals, can carry out filtering through the circuit in the filtration module 8, the signal of filtering imports the A/D switched pins 6 of single-chip microcomputer 5 into afterwards.
And, can refinement after considering analog switch module 3 and resistor group cooperating outputting measurement value, described resistance 4 is made of 12 resistance, can require to select these 12 resistance according to reality, 12 resistance is divided into two groups of high value and low resistance.Through a high resistance measurement and a low resistance resistance, the combination of two resistance can be exported certain limit and with intrinsic resolution be 3% resistance value.If certainly specific (special) requirements is arranged, also can be by in circuit, adding to improve the precision of output resistance into resistor group.Specifically, 0 ohm, 3 ohm, 6.2 ohm, 9.1 ohm, 12 ohm, 15 ohm these 6 resistance of low resistance group selection; 0 ohm, 15 ohm, 30 ohm, 47 ohm, 62 ohm, 75 ohm of high value group selections.Select a resistance in the high value group, select a resistance in low resistance, combine, just can form between 0 to 90 ohm, precision is all resistance values of 3 ohm.
Moreover in order to allow the communication bus institute data carried by data signal that is connected on single-chip microcomputer 5 communication port distortion not occur, described communication bus is a digital communication bus 7.
In conjunction with practical application of the present invention: displacement appears in magnet on the external device (ED), and the magnetic field intensity that is produced just in time can make the voltage signal of a linear change of these linear hall sensor 2 outputs thus.Immediately, this voltage signal inserts the A/D switched pins 6 of single-chip microcomputer 5 through the C circuit filtering of R in the filtration module 8.Afterwards, the different resistance 4 of single-chip microcomputer 5 control analog switch module 3 gatings that is to say the application by single-chip microcomputer 5, can control the corresponding resistance value of analog switch module 3 outputs according to the result of A/D conversion.Thus, by with the cooperating of external device (ED), this sensor can change into the variation of magnetic field intensity the numerical value of containers store solution quantity, is convenient to observe.
Again further, measure because the present invention mainly cooperates external device (ED) to carry out level sensing, and the individuality owing to container of storaging liquid there are differences, and can cause the position of external device (ED) to have change.Therefore, change as long as the corresponding positions of the magnet on linear hall sensor 2 and the external device (ED) is equipped with a bit, its magnetic field intensity will change, and causes the output voltage values of linear hall sensor 2 to change.Therefore need the process of a demarcation in use.Specifically, in the present invention when mounted, be connected with computing machine by digital communication bus 7, the state of external device (ED) is adjusted to the trunkful position then, by computer command, the corresponding A/D conversion value of output voltage of linear hall sensor 2 is at this moment noted.Afterwards, the state of external device (ED) is adjusted to the empty van position, the corresponding A/D conversion value of output voltage of linear hall sensor 2 is at this moment noted, finish demarcation.
By above-mentioned character express also in conjunction with the accompanying drawings as can be seen, after adopting the present invention, can cooperate single-chip microcomputer to carry out the measurement of containers store solution quantity by the variation that linear hall sensor is experienced magnetic field, not have the conducting medium that contacts with liquid, guarantee safety.And, by the different resistance of Single-chip Controlling analog switch module gating, the numerical value that can further accurately measure.Moreover calibration process is easy, and is easy to implement.
Certainly, more than only be concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.In addition to the implementation, the present invention can also have other embodiment.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop within the present invention's scope required for protection.
Claims (4)
1. a liquid level sensor sensing device includes the device top cover, it is characterized in that: be provided with processor in the described device top cover, the input end of processor is connected with the output terminal of linear hall sensor; The output terminal of described processor connects the input end of simulation switch module; The output terminal of described analog switch module is connected with the resistor group that different resistance resistance constitute; Be connected with communication bus on the communication port of described processor.
2. a kind of liquid level sensor sensing device according to claim 1 is characterized in that: be connected with filtration module on the output terminal of described linear hall sensor, the output terminal of filtration module is connected into the input end of processor.
3. a kind of liquid level sensor sensing device according to claim 1 is characterized in that: described processor is a single-chip microcomputer, and the input end of single-chip microcomputer is provided with the A/D switched pins.
4. a kind of liquid level sensor sensing device according to claim 1 is characterized in that: described communication bus is a digital communication bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010157341 CN102235898A (en) | 2010-04-28 | 2010-04-28 | Sensing device for liquid level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010157341 CN102235898A (en) | 2010-04-28 | 2010-04-28 | Sensing device for liquid level sensor |
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| Publication Number | Publication Date |
|---|---|
| CN102235898A true CN102235898A (en) | 2011-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010157341 Pending CN102235898A (en) | 2010-04-28 | 2010-04-28 | Sensing device for liquid level sensor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1648619A (en) * | 2004-12-27 | 2005-08-03 | 林利 | Two-way digital control type liquid level sensor |
| CN1811350A (en) * | 2006-02-24 | 2006-08-02 | 武汉理工大学 | Liquid level sensor |
| CN200962051Y (en) * | 2006-11-03 | 2007-10-17 | 河海大学常州校区 | Intelligent liquid level sensor |
| CN101476919A (en) * | 2009-01-23 | 2009-07-08 | 扬州奥力威传感器有限公司 | Hall fuel level sensor and its sealing technology |
| CN201688887U (en) * | 2010-04-28 | 2010-12-29 | 苏州工业园区易辰电子系统有限公司 | Sensing unit for liquid level sensors |
-
2010
- 2010-04-28 CN CN 201010157341 patent/CN102235898A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1648619A (en) * | 2004-12-27 | 2005-08-03 | 林利 | Two-way digital control type liquid level sensor |
| CN1811350A (en) * | 2006-02-24 | 2006-08-02 | 武汉理工大学 | Liquid level sensor |
| CN200962051Y (en) * | 2006-11-03 | 2007-10-17 | 河海大学常州校区 | Intelligent liquid level sensor |
| CN101476919A (en) * | 2009-01-23 | 2009-07-08 | 扬州奥力威传感器有限公司 | Hall fuel level sensor and its sealing technology |
| CN201688887U (en) * | 2010-04-28 | 2010-12-29 | 苏州工业园区易辰电子系统有限公司 | Sensing unit for liquid level sensors |
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Application publication date: 20111109 |