CN204007788U - Resistance-type level transducer - Google Patents
Resistance-type level transducer Download PDFInfo
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- CN204007788U CN204007788U CN201420291627.2U CN201420291627U CN204007788U CN 204007788 U CN204007788 U CN 204007788U CN 201420291627 U CN201420291627 U CN 201420291627U CN 204007788 U CN204007788 U CN 204007788U
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- operational amplifier
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Abstract
The utility model provides a kind of resistance-type level transducer, this resistance-type level transducer comprises constant-current source circuit, electrode and voltage comparator circuit, the output terminal of this constant-current source circuit is connected in this electrode, export a steady current to this electrode, this voltage comparator circuit is connected in the output terminal of this electrode and this constant-current source circuit, and the voltage on this electrode and a setting voltage are made comparisons.This resistance-type level transducer can accurately be measured the liquid level of high primary standard container, avoids the data that human factor causes to misread, mispronounce the generation of situation, is to realize automatically controlling crucial signals collecting link.
Description
Technical field
The utility model relates to the real-time measurement of the tank fill level such as metal can, pond, particularly relates to a kind of resistance-type level transducer.
Background technology
Volume pipe is a precision machined pipe that has certain length of inside surface process, is made up of the detector switch box auxiliary device of metering section shifter (piston or ball), energy Accurate Measurement shifter position.Volume pipe is mainly the standard set-up of calibrating volumeter.
Volume pipe is mainly the standard set-up of calibrating volumeter, and the volume pipe water gauge fixed ring that accurately whether depends on of its standard value saves.Volume pipe water gauge refers to by certain equipment and control system the liquid displacement of volume pipe prover section surely to the process of determining volumetric values in more higher leveled volumetric standard.
Becoming more meticulous of volume pipe water gauge process is to determine the whether accurate key of transmission of quantity value.The standard that volume pipe water gauge is qualified is to need continuous three nominal datas to reach repeatability to be not more than 0.02% requirement.Calibrating by is for many years in conjunction with the actual investigation of relevant unit, it is as follows that the water gauge process of discovery volume pipe exists some problems to gather: the commutation of (1) manual operation volume pipe water gauge, human factor impact is larger, very easily cause the distortion of volume pipe water gauge data, and work efficiency is lower; (2) manual operations cannot be accomplished the accurate control of flow, if the excessive interior bubble of standard can that will cause of flow is more, makes nominal data bigger than normal; It is lower that flow hour will make to demarcate efficiency; (3) manual operation accuracy is low, and the more difficult accurate distribution that realizes orthobaric volume of manual operation, easily causes nominal data effectively to be gathered, and causes and demarcates unsuccessfully.We have invented a kind of new resistance-type level transducer for this reason, have solved above technical matters.
Summary of the invention
The purpose of this utility model is to provide a kind of liquid level that can accurately measurement standard container, avoids the data that human factor causes to misread, mispronounce the resistance-type level transducer of the generation of situation.
The purpose of this utility model can be achieved by the following technical measures: resistance-type level transducer, this resistance-type level transducer comprises constant-current source circuit, electrode and voltage comparator circuit, the output terminal of this constant-current source circuit is connected in this electrode, export a steady current to this electrode, this voltage comparator circuit is connected in the output terminal of this electrode and this constant-current source circuit, and the voltage on this electrode and a setting voltage are made comparisons.
The purpose of this utility model also can be achieved by the following technical measures:
The steady current that this steady current of this constant-current source circuit output is 10uA, this setting voltage is 8V.
This constant-current source circuit comprises reference voltage source, operational amplifier group and the first resistance (R1), this operational amplifier group comprises the first operational amplifier (U1) and the 3rd operational amplifier (U3), the output terminal of this reference voltage source is coupled to the first input end (2 pin) of this first operational amplifier (U1), first output terminal (1 pin) of this first operational amplifier (U1) is coupled to the 3rd input end (6 pin) of this first operational amplifier (U1), second output terminal (7 pin) of this first operational amplifier (U1) is coupled to one end of this first resistance (R1), the other end of this first resistance (R1) is connected in second input end (3 pin) of the 3rd operational amplifier (U3), the first input end (2 pin) of the 3rd operational amplifier (U3) is connected in first output terminal (1 pin) of the 3rd operational amplifier (U3), first output terminal (1 pin) of the 3rd operational amplifier (U3) is coupled to the 3rd input end (6 pin) of the 3rd operational amplifier (U3), second output terminal (7 pin) of the 3rd operational amplifier (U3) is coupled to the 3rd input end (6 pin) of this first operational amplifier (U1), one end that second input end (3 pin) of this first resistance (R1) and the 3rd operational amplifier (U3) is connected is as the positive output end of this steady current, ground is as the negative output terminal of this steady current.
This reference voltage source is reference voltage source AD580, and this operational amplifier group is operational amplifier TL072, and this first resistance (R1) is 250K precision resistance.
5. resistance-type level transducer according to claim 1, it is characterized in that, this voltage comparator circuit comprises the second operational amplifier (U15), the first potentiometer (P1) and the first electrochemical capacitor (C6), second input end (5 pin) of this second operational amplifier (U15) is connected in the output terminal of this constant-current source circuit, the first input end (4 pin) of this second operational amplifier (U15) is connected in the high-end of this first potentiometer (R7), the low side of this first potentiometer (R7) connects adjustable end and the ground of this first potentiometer (R7), first output terminal (2 pin) of this second operational amplifier (U15) is connected in the anode of this first electrochemical capacitor (C6), and as this voltage comparator circuit positive output end, the negativing ending grounding of the first electrochemical capacitor (C6), and as this voltage comparator circuit negative output terminal.
This voltage comparator circuit is voltage comparator LM339.
Resistance-type level transducer in the utility model, by detecting the conductive characteristic of water and air, in conjunction with the application of automatic control technology, has designed resistance-type level transducer.It can accurately measurement standard container liquid level, avoid the data that human factor causes to misread, mispronounce the generation of situation.This sensor construction is simple, safety, in industry measurement system field, have larger promotional value, can accurately measure the liquid level of high primary standard container, is to realize automatically controlling crucial signals collecting link.Resistance-type level transducer in the utility model, takes probe-type design, has advantages of that volume is little, is easy to carry about with one and installs; Have that precision is high, the feature such as be quick on the draw, can reach ± 5mm of measuring error, has replaced artificial reading, has ensured the timely action of upper level volumetric standard commutator and volume pipe calibrating data accurately and reliably, has adapted to preferably the accurate judgement of liquid level; Mounting means is determined according to actual conditions, meets the practical application at various scenes; Simple to operate, easy care, dependable performance.
Brief description of the drawings
Fig. 1 is the circuit diagram of a specific embodiment of resistance-type level transducer of the present utility model.
Embodiment
For above and other object of the present utility model, feature and advantage can be become apparent, cited below particularly go out preferred embodiment, and coordinate appended graphicly, be described in detail below.
Volume pipe is mainly the standard set-up of calibrating volumeter, and the volume pipe water gauge fixed ring that accurately whether depends on of its standard value saves.Volume pipe water gauge refers to by certain equipment and control system the liquid displacement of volume pipe prover section surely to the process of determining volumetric values in more higher leveled volumetric standard.
As shown in Figure 1, the circuit diagram that Fig. 1 is resistance-type level transducer of the present utility model.Resistance-type level transducer is conductive characteristic this principle design by detecting water and air.It is made up of constant-current source circuit, electrode, voltage comparator circuit three parts.Constant-current source circuit is made up of reference voltage source AD580, operational amplifier TL072 and 250K precision resistance, export a 10uA electric current to electrode, if medium is air between electrode, Voltage-output is 10V, if medium is water between electrode, Voltage-output is about 5V (the about 500K of water resistance), again by voltage comparator LM339, with setting voltage 8V comparison, be less than a high level of 8V output, lower than a low level of 8V output, determine the liquid level of container by the height of judgement voltage.
In constant-current source circuit, one end of voltage reference R4 output terminal contact resistance R3, the other end of resistance R 3 is connected to the 2 pin input ends of operational amplifier U1 and one end of resistance R 2, the 1 pin output terminal of the other end concatenation operation amplifier U1 of resistance R 2 and one end of resistance R 5, the 6 pin input ends of the other end concatenation operation amplifier U1 of resistance R 5, one end of one end of resistance R 12 and resistance R 11, 7 pin the second output terminals of the other end concatenation operation amplifier U1 of resistance R 12 and one end of resistance R 1, the 3 pin input ends of the other end concatenation operation amplifier U3 of resistance R 1, the 1 pin output terminal of the 2 pin concatenation operation amplifier U3 of operational amplifier U3 and one end of resistance R 0, the 6 pin input ends of the other end operational amplifier U3 of resistance R 0 and one end of resistance R 10, the 7 pin output terminals of the other end operational amplifier U3 of resistance R 10 and the other end of resistance R 11, the 3 pin input ends of operational amplifier U1, the 5 pin input ends of operational amplifier U1 and the 5 pin input end groundings of operational amplifier U3, one end that the 3 pin input ends of resistance R 1 and operational amplifier U3 are connected is as electric current positive output end, ground is as negative output terminal.
In described voltage comparator circuit, the output terminal of constant current source is connected to potential electrode, the 5 pin input ends of one end of capacitor C 5 and operational amplifier U15, one end of resistance R 6 is just connecting 12V power supply, the other end of resistance R 6 connects the 4 pin input ends of the high-end and operational amplifier U15 of potentiometer R7, the low side of potentiometer P1 connects adjustable end and the ground of potentiometer R7, the 2 pin output terminals of operational amplifier U15 connect the anode of electrochemical capacitor C6 and one end of resistance R 29, and as voltage comparator circuit positive output end, the other end of resistance R 29 is just connecting 12V power supply, the negativing ending grounding of electrochemical capacitor C6, and as voltage comparator circuit negative output terminal.
Electrode is fixed on (the unsettled placement of electrode) on standard tank skin by clip, and one end is by wire connecting electrode (electrode 1), and one end is connected to tube wall (conduction, is equivalent to electrode 2).Set in advance the position of electrode 1, along with the continuous increase of pot liquid volume, in the time that between electrode 1 and tank skin, medium is converted to liquid by air, resistance between electrode changes, calculate magnitude of voltage by constant-current source circuit, relatively draw liquid bit position through voltage comparator circuit.
Claims (6)
1. resistance-type level transducer, it is characterized in that, this resistance-type level transducer comprises constant-current source circuit, electrode and voltage comparator circuit, the output terminal of this constant-current source circuit is connected in this electrode, export a steady current to this electrode, this voltage comparator circuit is connected in the output terminal of this electrode and this constant-current source circuit, and the voltage on this electrode and a setting voltage are made comparisons.
2. resistance-type level transducer according to claim 1, is characterized in that, the steady current that this steady current of this constant-current source circuit output is 10uA, and this setting voltage is 8V.
3. resistance-type level transducer according to claim 1, it is characterized in that, this constant-current source circuit comprises reference voltage source, operational amplifier group and the first resistance (R1), this operational amplifier group comprises the first operational amplifier (U1) and the 3rd operational amplifier (U3), the output terminal of this reference voltage source is coupled to the first input end (2 pin) of this first operational amplifier (U1), first output terminal (1 pin) of this first operational amplifier (U1) is coupled to the 3rd input end (6 pin) of this first operational amplifier (U1), second output terminal (7 pin) of this first operational amplifier (U1) is coupled to one end of this first resistance (R1), the other end of this first resistance (R1) is connected in second input end (3 pin) of the 3rd operational amplifier (U3), the first input end (2 pin) of the 3rd operational amplifier (U3) is connected in first output terminal (1 pin) of the 3rd operational amplifier (U3), first output terminal (1 pin) of the 3rd operational amplifier (U3) is coupled to the 3rd input end (6 pin) of the 3rd operational amplifier (U3), second output terminal (7 pin) of the 3rd operational amplifier (U3) is coupled to the 3rd input end (6 pin) of this first operational amplifier (U1), one end that second input end (3 pin) of this first resistance (R1) and the 3rd operational amplifier (U3) is connected is as the positive output end of this steady current, ground is as the negative output terminal of this steady current.
4. resistance-type level transducer according to claim 3, is characterized in that, this reference voltage source is reference voltage source AD580, and this operational amplifier group is operational amplifier TL072, and this first resistance (R1) is 250K precision resistance.
5. resistance-type level transducer according to claim 1, it is characterized in that, this voltage comparator circuit comprises the second operational amplifier (U15), the first potentiometer (P1) and the first electrochemical capacitor (C6), second input end (5 pin) of this second operational amplifier (U15) is connected in the output terminal of this constant-current source circuit, the first input end (4 pin) of this second operational amplifier (U15) is connected in the high-end of this first potentiometer (R7), the low side of this first potentiometer (R7) connects adjustable end and the ground of this first potentiometer (R7), first output terminal (2 pin) of this second operational amplifier (U15) is connected in the anode of this first electrochemical capacitor (C6), and as this voltage comparator circuit positive output end, the negativing ending grounding of the first electrochemical capacitor (C6), and as this voltage comparator circuit negative output terminal.
6. resistance-type level transducer according to claim 1, is characterized in that, this voltage comparator circuit is voltage comparator LM339.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420291627.2U CN204007788U (en) | 2014-06-04 | 2014-06-04 | Resistance-type level transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420291627.2U CN204007788U (en) | 2014-06-04 | 2014-06-04 | Resistance-type level transducer |
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| Publication Number | Publication Date |
|---|---|
| CN204007788U true CN204007788U (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420291627.2U Expired - Fee Related CN204007788U (en) | 2014-06-04 | 2014-06-04 | Resistance-type level transducer |
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| CN (1) | CN204007788U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865571A (en) * | 2016-06-23 | 2016-08-17 | 武汉天富海科技发展有限公司 | Device of remotely testing liquid level of high-voltage power electronic equipment cooling system |
| CN107966332A (en) * | 2017-11-21 | 2018-04-27 | 宇星科技发展(深圳)有限公司 | Particulate matter detection means and its circuit |
| CN109798951A (en) * | 2017-11-17 | 2019-05-24 | 厦门雅迅网络股份有限公司 | A kind of vehicle-mounted oil level detection from circuit for rectifying and method |
-
2014
- 2014-06-04 CN CN201420291627.2U patent/CN204007788U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865571A (en) * | 2016-06-23 | 2016-08-17 | 武汉天富海科技发展有限公司 | Device of remotely testing liquid level of high-voltage power electronic equipment cooling system |
| CN109798951A (en) * | 2017-11-17 | 2019-05-24 | 厦门雅迅网络股份有限公司 | A kind of vehicle-mounted oil level detection from circuit for rectifying and method |
| CN109798951B (en) * | 2017-11-17 | 2020-10-20 | 厦门雅迅网络股份有限公司 | Self-correction circuit and method for vehicle-mounted oil level detection |
| CN107966332A (en) * | 2017-11-21 | 2018-04-27 | 宇星科技发展(深圳)有限公司 | Particulate matter detection means and its circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20160604 |