CN1138133A - Magnetic controlled liquid level interface instrument - Google Patents
Magnetic controlled liquid level interface instrument Download PDFInfo
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- CN1138133A CN1138133A CN95110295A CN95110295A CN1138133A CN 1138133 A CN1138133 A CN 1138133A CN 95110295 A CN95110295 A CN 95110295A CN 95110295 A CN95110295 A CN 95110295A CN 1138133 A CN1138133 A CN 1138133A
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Abstract
The magnetically controlled level-boundary instrument using two magnetic floats with different specific weights for detecting two liquids with different specific weights or the oil-water liquid features that under action of magnetic floats, the contacts in dry reed tube inside protecting tube close or open to cause change in output resistance of sensor, magnetic float A gives level height signal, magnetic float B gives oil thickness signal, and the resistance signal is transformed into voltage to indicate level height and oil thickness. Said instrument has the advantages of quick and correct detection, small error and high sensitivity (2 cm).
Description
The present invention relates to the liquid that a kind of measurement has different specific weight, particularly a kind of detector of measuring profit.
Crude oil comes out from underground mining, is carrying a large amount of moisture content secretly, and this crude oil is depositing water after putting into storage tank below, and is oily adrift above, to this detection with liquid of different specific weight.According to Chinese patent ZL87210663 described { oil-water interfaces checkout gear } " it is according to two kinds of different media of profit, and the principle different to the electromagnetic wave energy absorption characteristic implemented the technique device that oil-water interfaces are detected ".It is to adopt controller, shortwave generator, sensor and closed chamber to form.
The purpose of this invention is to provide a kind of detection has liquids having different specific weight in container magnetic controlled liquid level interface instrument.
The present invention adopts such method to realize: all have in proportion different the liquid dress and same container, as long as they exist the liquid level interface, can show liquid level and upper surface to the one-tenth-value thickness 1/10 between the interface with it, also available it detect liquid level under the general occasion.
Measuring method of the present invention is to adopt a kind of magnetic floating ball sensor, sensor is in the stainless steel tube of a sealing, every 20mm a resistance and a tongue tube are installed, in the ball float outside the stainless steel tube permanent-magnet steel is housed, when ball float floats with liquid level (or interface) upward, magnet steel on the ball float makes relatively and this locational tongue tube adhesive, so the all-in resistance of circuit just presents different resistances along with the tongue tube adhesive of diverse location, by measuring the position that resistance excrements can be extrapolated the magnet steel place, and then the position that can get ball float.Ball float on the stainless steel tube has two, because the mass density difference of ball float, one of them is floated on the liquid level (be used for measuring liquid level), another floats between oil and the water, be oil-water interfaces place (being used to measure interface location), so just can measure the height at liquid level and interface by two diverse locations that ball float floated.
The variation of the magnetic ball float position in the sensor can make the resistance value of sensor that corresponding the variation taken place, so the key of measuring instrument is to measure the resistance of sensor accurately, and it is converted to corresponding position height gets final product.Be provided with constant-current source circuit in measuring circuit, no matter promptly the resistance of sensor is much, the electric current of constant-current source output is always a stable numerical value for this reason.According to Ohm's law, just can draw the height value of survey mark by the voltage of measuring transducer like this.
The size that demonstrates voltage by digital voltmeter is just represented the height at interface.
The 4-20mA circuit converts it to magnitude of current output and is convenient to be connected with miscellaneous equipment.
Because the measurement of liquid level is begined a theatrical performance from top, promptly the resistance at the most significant end of sensor is output as zero Europe, so the voltage signal of liquid level can not directly show and need change, in this circuit, adopt high precision operating amplifier 0P07 to carry out subtraction, be that output voltage that computing is amplified equals the output voltage that a voltage of representing most significant end deducts sensor, this voltage is promptly represented the height value of liquid level.
This circuit also is provided with the liquid level warning circuit, when the height of liquid level exceeds the lower limit height that upper limit height is set or is lower than setting, and circuit generation sound and light alarm, and switching value of corresponding relay adhesive output is controlled automatically for executing agency.Circuit is by the set positions circuit, comparator and warning output circuit are formed, compositions such as set positions circuit reference power supply and potentiometer can show by voltmeter when being provided with, and the magnitude of voltage of demonstration is the height value of representative setting just, the voltage of setting with represent the voltage of liquid level in comparator, to compare, when liquid level transfinites, represent the voltage of liquid level also must exceed, the output of setting voltage value and comparator changes, the relay adhesive, warning circuit sends sound and light alarm.
The present invention compared with prior art, have and detect soon, error is little, sensitivity is that 2Cm detects characteristic of accurate, and be a kind of anti-explosion product, it is applicable to that the different liquid of two kinds of proportions of profit combination and other detects liquid level or interfacial level, thereby can detect core intersection and subnatant body thickness.
Specific embodiments of the invention are provided by the following drawings;
Fig. 1 is a control principle block diagram of the present invention.
Fig. 2 is the electric schematic diagram of sensor of the present invention.
Below in conjunction with accompanying drawing to specific embodiments of the invention with further instruction.
Embodiment
See shown in the accompanying drawing 1,2: the sensor 3 of magnetic controlled liquid level interface instrument is in the stainless steel tube of a sealing, and tongue tube and metalfilmresistor are equipped with by differing heights in inside, and the outside is with two magnetic floats 1,2 that proportion is different, and the sealing anti-explosion terminal box is equipped with on top.Every 20mm a resistance and a tongue tube are installed in stainless steel tube, R1, R2...Rm..Rn are resistance, and resistance R is 20 ohm, and precision is 0.1%, K0, K1, K2 ... Km-
1..Km be tongue tube; in the ball float outside the stainless steel tube permanent-magnet steel is housed; because magnetic float proportion difference, magnetic float 1 floats on the crude oil surface, and magnetic float 2 floats on the interface of crude oil and water; the tongue tube of protection tube inside is under the effect of magnetic float; contact closure or disconnection cause sensor 3 output change in resistance, and magnetic float 1 has provided the core intersection signal, and magnetic float 2 has provided the water layer thickness signal; after converting the resistance signal to voltage signal again, show liquid level height and interface height by digital watch 6,7.
The variation of the magnetic ball float position in the sensor 3 can make the resistance value of sensor 3 that corresponding the variation taken place, so the key of measuring instrument is to measure the resistance of sensor 3 accurately, and it is converted to corresponding position height gets final product.Be provided with constant-current source circuit 4 in measuring circuit, no matter promptly the resistance of sensor 3 is much, the electric current of constant-current source output is always a stable numerical value for this reason.According to Ohm's law, just can draw the height value of survey mark by the voltage of measuring transducer 3 like this.
The size that demonstrates voltage by digital voltmeter 6,7 is just represented the height at liquid level and interface.
4-20mA circuit 11 converts it to magnitude of current output and is convenient to be connected with miscellaneous equipment.As computer etc.
Because the measurement of liquid level is begined a theatrical performance from top, promptly the resistance at the most significant end of sensor 3 is output as zero ohm, so the voltage signal of liquid level can not directly show and need change, in this circuit, adopt high precision operating amplifier 5 (OP07) to carry out subtraction, be that output voltage that computing is amplified equals the output voltage that a voltage of representing most significant end deducts sensor 3, this voltage is promptly represented the height value of liquid level.
This circuit also is provided with liquid level warning circuit 10, when the height of liquid level exceeds the lower limit height that upper limit height is set or is lower than setting, circuit generation sound and light alarm, and switching value of corresponding relay adhesive output is controlled automatically for executing agency.Circuit is by set positions circuit 8, comparator 9 and warning output circuit 10 are formed, set positions circuit 8 is made up of reference power supply and potentiometer etc., when being provided with, can show by voltmeter, the magnitude of voltage that shows is the height value of representative setting just, the voltage of setting and the voltage of representing liquid level 9 compare in comparator, when liquid level transfinites, represent the voltage of liquid level also must exceed, the output of setting voltage value and comparator 9 changes, the relay adhesive, warning circuit 10 sends sound and light alarm.
The technical data of this equipment:
Working power is a 1mA Constant Direct Current power supply, and this source short circuit current is not more than 1mA, and open-circuit voltage is not more than 10V.
Range ability: 0-1000mm, 0-10000mm.
Operating ambient temperature :-20-40 ℃, operating temperature :-20-100 ℃ (being 0-100 ℃ in water).
Relative humidity≤95%
Working environment atmospheric pressure 85-110KPa
Can bear pressure: be not more than 1.0MPa
Measure stainless steel tube diameter phi 32-50mm, magnetic float 1 diameter is φ 260mm, and magnetic float 2 diameters are φ 120mm.
This instrument power supply power supply 24VDC, supply current is not more than 400mA, and power consumption is not more than 10W.
Sensor is installed and can be adopted loophole that method is installed, and also can adopt container that method is installed.
It is the RWP type three cores cables of admiring that type of explosion proof construc tion adopts outside stube cable.
Claims (1)
1, a kind of magnetic controlled liquid level interface instrument, it is according to two kinds of different media of profit, the principle different to the electromagnetic wave energy absorption characteristic implemented the technique device to the oil-water interfaces detection, and its device is to adopt controller, shortwave generator, sensor and closed chamber to form; It is characterized in that: sensor (3) is contained in the stainless steel tube of sealing, tongue tube and metalfilmresistor are equipped with by differing heights in inside, the outside is with two magnetic float (1), (2) that proportion is different, the sealing anti-explosion terminal box is equipped with on top, in stainless steel tube, a resistance and a tongue tube are installed every 20mm, resistance is 20 ohm, and precision is 0.1%, K0, K1, K2 ... Km-
1..Km be tongue tube, in the ball float outside the stainless steel tube permanent-magnet steel is housed, because magnetic float proportion difference, magnetic float (1) floats on former in the crude oil surface, magnetic float (2) floats on the interface of crude oil and water, the tongue tube of protection tube inside is under the effect of magnetic float, contact closure or disconnection cause sensor (3) output change in resistance, magnetic float (1) has provided the core intersection signal, magnetic float (2) has provided the core intersection signal, after converting the resistance signal to voltage signal again, show the high and interface height of liquid level by digital watch (6), (7); The resistance of sensor (3) provides the electric current on constant-current source output road (4) to be always a stable numerical value by instrument, in this circuit, adopt high precision operating amplifier (5), be that output voltage that computing is amplified equals the output voltage that a voltage of representing most significant end deducts sensor (3), this voltage is promptly represented the height value of liquid level;
This circuit is by set positions circuit (8), comparator (9) and warning output circuit (10) are formed, set positions circuit (8) is made up of reference power supply and potentiometer etc., when being provided with, can show by voltmeter, the magnitude of voltage that shows is the height value of representative setting just, the voltage of setting with represent the voltage of liquid level in comparator (9), to compare, when liquid level transfinites, represent the voltage of liquid level also must exceed, the output of setting voltage value and comparator (9) changes, the relay adhesive, warning circuit (10) sends sound and light alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95110295A CN1138133A (en) | 1995-06-13 | 1995-06-13 | Magnetic controlled liquid level interface instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95110295A CN1138133A (en) | 1995-06-13 | 1995-06-13 | Magnetic controlled liquid level interface instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1138133A true CN1138133A (en) | 1996-12-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95110295A Pending CN1138133A (en) | 1995-06-13 | 1995-06-13 | Magnetic controlled liquid level interface instrument |
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| CN (1) | CN1138133A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7614299B2 (en) | 2003-12-19 | 2009-11-10 | Siemens Aktiengesellschaft | Device and method for monitoring a gas volume in a unit filled with liquid |
| CN102159792A (en) * | 2008-08-15 | 2011-08-17 | Cnx天然气有限公司 | Down-hole liquid level control for hydrocarbon wells |
| CN102477862A (en) * | 2010-11-23 | 2012-05-30 | 中国石油天然气股份有限公司 | Application of detector (for acquiring underground oil-water interfaces) controlled by portable computer |
| CN102913231A (en) * | 2012-10-22 | 2013-02-06 | 陈强 | Magnetic induction liquid level interface instrument |
| CN103983327A (en) * | 2014-06-03 | 2014-08-13 | 陈东 | Three-interface measuring instrument in oil storage tank |
| WO2015034656A1 (en) | 2013-09-06 | 2015-03-12 | Oleumtech Corporation | Resistive liquid level/temperature sensor and transmitter |
| CN105222862A (en) * | 2015-10-26 | 2016-01-06 | 天津商业大学 | The tongue tube liquid level gauge that a kind of constant current drives |
| CN106052798A (en) * | 2016-06-30 | 2016-10-26 | 珠海格力智能装备有限公司 | Liquid level sensing device and liquid level detection method |
-
1995
- 1995-06-13 CN CN95110295A patent/CN1138133A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100592041C (en) * | 2003-12-19 | 2010-02-24 | 西门子公司 | Device and method for monitoring a gas volume in a unit filled with liquid |
| US7614299B2 (en) | 2003-12-19 | 2009-11-10 | Siemens Aktiengesellschaft | Device and method for monitoring a gas volume in a unit filled with liquid |
| CN102159792B (en) * | 2008-08-15 | 2015-05-20 | Cnx天然气有限公司 | Down-hole liquid level control for hydrocarbon wells |
| CN102159792A (en) * | 2008-08-15 | 2011-08-17 | Cnx天然气有限公司 | Down-hole liquid level control for hydrocarbon wells |
| US9453394B2 (en) | 2008-08-15 | 2016-09-27 | Cnx Gas Company Llc | Down-hole liquid level control for hydrocarbon wells |
| CN104832162A (en) * | 2008-08-15 | 2015-08-12 | Cnx天然气有限公司 | Down-hole liquid level control for hydrocarbon wells |
| CN102477862A (en) * | 2010-11-23 | 2012-05-30 | 中国石油天然气股份有限公司 | Application of detector (for acquiring underground oil-water interfaces) controlled by portable computer |
| CN102477862B (en) * | 2010-11-23 | 2014-08-06 | 中国石油天然气股份有限公司 | Application of detector (for acquiring underground oil-water interfaces) controlled by portable computer |
| CN102913231A (en) * | 2012-10-22 | 2013-02-06 | 陈强 | Magnetic induction liquid level interface instrument |
| WO2015034656A1 (en) | 2013-09-06 | 2015-03-12 | Oleumtech Corporation | Resistive liquid level/temperature sensor and transmitter |
| EP3042161A4 (en) * | 2013-09-06 | 2017-05-24 | Oleumtech Corporation | Resistive liquid level/temperature sensor and transmitter |
| CN103983327A (en) * | 2014-06-03 | 2014-08-13 | 陈东 | Three-interface measuring instrument in oil storage tank |
| CN105222862A (en) * | 2015-10-26 | 2016-01-06 | 天津商业大学 | The tongue tube liquid level gauge that a kind of constant current drives |
| CN106052798A (en) * | 2016-06-30 | 2016-10-26 | 珠海格力智能装备有限公司 | Liquid level sensing device and liquid level detection method |
| WO2018001155A1 (en) * | 2016-06-30 | 2018-01-04 | 珠海格力智能装备有限公司 | Liquid level sensing device and liquid level detection method |
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