CN102426286B - Polarization voltage detection circuit used in electromagnetic flow meter - Google Patents
Polarization voltage detection circuit used in electromagnetic flow meter Download PDFInfo
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- CN102426286B CN102426286B CN 201110288210 CN201110288210A CN102426286B CN 102426286 B CN102426286 B CN 102426286B CN 201110288210 CN201110288210 CN 201110288210 CN 201110288210 A CN201110288210 A CN 201110288210A CN 102426286 B CN102426286 B CN 102426286B
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- 238000001514 detection method Methods 0.000 title abstract description 7
- 230000010287 polarization Effects 0.000 title abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 7
- 101150037009 pin1 gene Proteins 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
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Abstract
The invention relates to a polarization voltage detection circuit used in an electromagnetic flow meter. A resistor R1 and a resistor R2 are connected with a pin 3 of an operational amplifier U1. The resistor R2 is connected with a pin 4 of the operational amplifier U1, a pin 2 of a double-channel comparator channel one U2A and a pin 5 of a double-channel comparator channel two U2B. A measuring electrode PB is connected with a resistor R3. The resistor R3 is connected with a resistor R4 and a pin1 of the operational amplifier U1. The resistor R4 is grounded. A pin 5 of the operational amplifier U1 is connected with a positive supply VAcc. A pin 2 of the operational amplifier U1 is connected with a negative supply VAss. The pin 3 of the double-channel comparator channel one U2A is connected with a positive 1.2V. A pin 8 of the double-channel comparator U2A is connected with the positive supply VAcc. The pin 4 of the double-channel comparator U2A is connected with the negative supply VAss. A pin 6 of the double-channel comparator channel two U2B is connected with a negative 1.2V. By using the circuit, a user can timely maintain electromagnetic measurement of the electromagnetic flow meter so that zero point stability of the electromagnetic flow meter can be ensured and correct measurement of the electromagnetic flow meter can be realized. The circuit is simple, economical and practical.
Description
Technical field
The present invention relates to a kind of circuit that the electromagnetic flowmeter polarizing voltage detects that is applied to.
Background technology
Polarization of electrode can be produced when contacting with detected fluid due to potential electrode, namely the polarizing voltage with slow variation and randomness irrelevant with flow can be produced between two potential electrode of electromagnetic flowmeter.The size of polarizing voltage and polarity have very strong randomness, electromagnetic flowmeter adopts the excitation mode of low frequency square wave can not eliminate polarizing voltage fully more at present, (being generally the 120mV left and right) will flood the flow signal of reaction flow velocity after polarizing voltage reaches certain amplitude, can not reflect flow velocity, affect the zero stability of electromagnetic flowmeter, can not realize real measurement.
Summary of the invention
Deficiency in view of the prior art existence, the invention provides a kind of circuit that the electromagnetic flowmeter polarizing voltage detects that is applied to, this circuit can detect potential electrode two ends and whether have polarizing voltage, and can detect the testing circuit of polarizing voltage polarity, so that the user in time safeguards the measurement electromagnetism of electromagnetic flowmeter, guarantee the zero stability of electromagnetic flowmeter, realize the correct measurement of electromagnetic flowmeter.
the present invention to achieve these goals, the technical scheme that adopts is: a kind of circuit that is applied to the detection of electromagnetic flowmeter polarizing voltage, it is characterized in that: potential electrode PA is connected with an end of resistance R 1, one end of the other end of resistance R 1 and resistance R 2, inverting input 3 pin of operational amplifier U1 connect, output terminal 4 pin of the other end of resistance R 2 and operational amplifier U1, inverting input 2 pin of two-way comparer passage one U2A, in-phase input end 5 pin of two-way comparer passage two U2B connect, potential electrode PB is connected with an end of resistance R 3, one end of the other end of resistance R 3 and resistance R 4, in-phase input end 1 pin of operational amplifier U1 connects, the other end of resistance R 4 is connected with ground, ground electrode PG is connected with ground, power supply side 5 pin of operational amplifier U1 are connected with positive supply VAcc, earth terminal 2 pin of operational amplifier U1 are connected with negative supply VAss, in-phase input end 3 pin of two-way comparer passage one U2A are connected with+1.2V, power supply side 8 pin of two-way comparer U2A are connected with positive supply VAcc, earth terminal 4 pin of two-way comparer U2A are connected with negative supply VAss, output terminal 1 pin of two-way comparer passage one U2A is connected with the I/O mouth of single-chip microcomputer, inverting input 6 pin of two-way comparer passage two U2B are connected with-1.2V, output terminal 7 pin of two-way comparer passage two U2B are connected with the I/O mouth of single-chip microcomputer.
The invention has the beneficial effects as follows: can detect electromagnetic flowmeter survey electrode two ends and whether produce polarizing voltage, and can detect polarizing voltage polarity, so that the user in time safeguards the measurement electromagnetism of electromagnetic flowmeter, guarantee the zero stability of electromagnetic flowmeter, realize the correct measurement of electromagnetic flowmeter.Circuit is simple, and is economical and practical.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is application example schematic diagram of the present invention.
Embodiment
as shown in Figure 1, a kind of circuit that is applied to the detection of electromagnetic flowmeter polarizing voltage, potential electrode PA is connected with an end of resistance R 1, one end of the other end of resistance R 1 and resistance R 2, inverting input 3 pin of operational amplifier U1 connect, output terminal 4 pin of the other end of resistance R 2 and operational amplifier U1, inverting input 2 pin of two-way comparer passage one U2A, in-phase input end 5 pin of two-way comparer passage two U2B connect, potential electrode PB is connected with an end of resistance R 3, one end of the other end of resistance R 3 and resistance R 4, in-phase input end 1 pin of operational amplifier U1 connects, the other end of resistance R 4 is connected with ground, ground electrode PG is connected with ground, power supply side 5 pin of operational amplifier U1 are connected with positive supply VAcc, earth terminal 2 pin of operational amplifier U1 are connected with negative supply VAss, in-phase input end 3 pin of two-way comparer passage one U2A are connected with+1.2V, power supply side 8 pin of two-way comparer U2A are connected with positive supply VAcc, earth terminal 4 pin of two-way comparer U2A are connected with negative supply VAss, output terminal 1 pin of two-way comparer passage one U2A is connected with the I/O mouth P1.0 of single-chip microcomputer, inverting input 6 pin of two-way comparer passage two U2B are connected with-1.2V, output terminal 7 pin of two-way comparer passage two U2B are connected with the I/O mouth P1.1 of single-chip microcomputer.
as shown in Figure 2, potential electrode PA is connected with an end of resistance R 1, one end of the other end of resistance R 1 and resistance R 2, inverting input 3 pin of operational amplifier U1 connect, output terminal 4 pin of the other end of resistance R 2 and operational amplifier U1, inverting input 2 pin of two-way comparer passage one U2A, in-phase input end 5 pin of two-way comparer passage two U2B connect, potential electrode PB is connected with an end of resistance R 3, one end of the other end of resistance R 3 and resistance R 4, in-phase input end 1 pin of operational amplifier U1 connects, the other end of resistance R 4 is connected with ground, ground electrode PG is connected with ground, power supply side 5 pin of operational amplifier U1 are connected with positive supply+3V, earth terminal 2 pin of operational amplifier U1 are connected with negative supply-3V, in-phase input end 3 pin of two-way comparer passage one U2A are connected with+1.2V, power supply side 8 pin of two-way comparer U2A are connected with positive supply+3V, earth terminal 4 pin of two-way comparer U2A are connected with negative supply-3V, output terminal 1 pin of two-way comparer passage one U2A is connected with the I/O mouth P1.0 of single-chip microcomputer, inverting input 6 pin of two-way comparer passage two U2B are connected with-1.2V, output terminal 7 pin of two-way comparer passage two U2B are connected with the I/O mouth P1.1 of single-chip microcomputer.
Principle of work: resistance R 1 equates with resistance R 3, and resistance R 2 equates with resistance R 4, and resistance R 1 is 10 times of resistance R 2; Resistance R 1, resistance R 2, resistance R 3, resistance R 4, operational amplifier U1 have formed a differential amplifier circuit, and enlargement factor is 10.When potential electrode PA current potential equals potential electrode PB current potential, the current potential of in-phase input end 5 pin of inverting input 2 pin of two-way comparer passage one U2A and two-way comparer passage two U2B is zero, the output terminal output high level of two-way comparer passage one U2A, the output terminal output high level of two-way comparer passage two U2B.When potential electrode PA current potential during higher than potential electrode PB current potential 120mV, the current potential of 5 pin of input end in the same way of inverting input 2 pin of two-way comparer passage one U2A and two-way comparer passage two U2B is greater than+1.2V, the output terminal output low level of two-way comparer passage one U2A, the output terminal output high level of two-way comparer passage two U2B.Otherwise, when potential electrode PA current potential lower than potential electrode PB current potential 120mV, the current potential of in-phase input end 5 pin of inverting input 2 pin of two-way comparer passage one U2A and two-way comparer passage two U2B is less than-1.2V, the output terminal output high level of two-way comparer passage one U2A, the output terminal output low level of two-way comparer passage two U2B.The output terminal of two-way comparer passage one U2A is connected the output terminal of U2B and is connected respectively I/O mouth P1.0 and the P1.1 of single-chip microcomputer with two-way comparer passage, the detection of the high-low level by I/O mouth P1.0 and P1.1 realizes whether electromagnetic flowmeter survey electrode two ends exist the detection of polarizing voltage and polarizing voltage polarity.
Claims (1)
1. one kind is applied to the circuit that the electromagnetic flowmeter polarizing voltage detects, it is characterized in that: potential electrode PA is connected with an end of resistance R 1, one end of the other end of resistance R 1 and resistance R 2, inverting input 3 pin of operational amplifier U1 connect, output terminal 4 pin of the other end of resistance R 2 and operational amplifier U1, inverting input 2 pin of two-way comparer passage one U2A, in-phase input end 5 pin of two-way comparer passage two U2B connect, potential electrode PB is connected with an end of resistance R 3, one end of the other end of resistance R 3 and resistance R 4, in-phase input end 1 pin of operational amplifier U1 connects, the other end of resistance R 4 is connected with ground, ground electrode PG is connected with ground, power supply side 5 pin of operational amplifier U1 are connected with positive supply VAcc, earth terminal 2 pin of operational amplifier U1 are connected with negative supply VAss, in-phase input end 3 pin of two-way comparer passage one U2A are connected with+1.2V, power supply side 8 pin of two-way comparer passage one U2A are connected with positive supply VAcc, earth terminal 4 pin of two-way comparer passage one U2A are connected with negative supply VAss, output terminal 1 pin of two-way comparer passage one U2A is connected with the I/O mouth of single-chip microcomputer, inverting input 6 pin of two-way comparer passage two U2B are connected with-1.2V, output terminal 7 pin of two-way comparer passage two U2B are connected with the I/O mouth of single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110288210 CN102426286B (en) | 2011-09-26 | 2011-09-26 | Polarization voltage detection circuit used in electromagnetic flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110288210 CN102426286B (en) | 2011-09-26 | 2011-09-26 | Polarization voltage detection circuit used in electromagnetic flow meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102426286A CN102426286A (en) | 2012-04-25 |
| CN102426286B true CN102426286B (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110288210 Expired - Fee Related CN102426286B (en) | 2011-09-26 | 2011-09-26 | Polarization voltage detection circuit used in electromagnetic flow meter |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107192896A (en) * | 2017-06-09 | 2017-09-22 | 国网浙江省电力公司杭州供电公司 | Measurement apparatus for High voltage power frequence electric field |
| CN116223886B (en) * | 2023-02-15 | 2023-09-29 | 海的电子科技(苏州)有限公司 | Method and device for detecting voltage signal and storage medium |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58216916A (en) * | 1982-06-11 | 1983-12-16 | Teijin Ltd | Dc exciting type electromagnetic flowmeter |
| CN2441144Y (en) * | 2000-08-25 | 2001-08-01 | 山东省远大网络多媒体有限责任公司 | Relative voltage measuring device |
| CN201159745Y (en) * | 2008-02-02 | 2008-12-03 | 李天平 | Circuit element voltage measurement device |
| CN202256448U (en) * | 2011-09-26 | 2012-05-30 | 中环天仪股份有限公司 | Circuit applied to detect polarization voltage of electromagnetic flowmeter |
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