CN203337218U - Liquid-level measuring meter for totally-closed pressure environment - Google Patents
Liquid-level measuring meter for totally-closed pressure environment Download PDFInfo
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- CN203337218U CN203337218U CN2013203489082U CN201320348908U CN203337218U CN 203337218 U CN203337218 U CN 203337218U CN 2013203489082 U CN2013203489082 U CN 2013203489082U CN 201320348908 U CN201320348908 U CN 201320348908U CN 203337218 U CN203337218 U CN 203337218U
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Abstract
The utility model discloses a liquid-level measuring meter for a totally-closed pressure environment. The liquid-level measuring meter for the totally-closed pressure environment comprises an outer sleeve, heating wires and thermocouples, wherein the front end of the outer sleeve is sealed, the heating wires and the thermocouples are arranged in a pipe hole of the outer sleeve, the heating wires are arranged on the axis of the outer sleeve, the two wiring ends of each heating wire are connected with leads in a welding mode, the leads extend out of the outer sleeve, a plurality of thermocouples are arranged, and are evenly arranged around the heating wires, the distances between the front ends of the thermocouples and the end face of the front end of the outer sleeve are set in an arithmetic progression mode, the rear ends of the thermocouples extend out of the outer sleeve, thermo wires at the rear ends of the thermocouples are connected with compensating wires in a welding mode, the positions among the thermocouples, the heating wires and the outer sleeve are filled with insulating materials, and the rear end of the outer sleeve is sealed through the insulating materials. The liquid-level measuring meter for the totally-closed pressure environment can accurately distinguish the specific position of the liquid level in the severe environments such as the high-temperature environment, the high-pressure environment and the like, and is good in disturbance resisting capacity, simple in structure, low in production cost and wide in range of application.
Description
Technical field
The utility model relates to the fluid level measuring gauge field, particularly relates to a kind of fluid level measuring gauge for totally-enclosed pressure environment.
Background technology
At present, the level measuring of totally-enclosed pressure environment adopts the magnetostrictive liquid level meter to be measured usually, during the working sensor of magnetostrictive liquid level meter, the circuit part of sensor will motivate pulse current on waveguide filament, produce impulse current magnetic field when this electric current is propagated along waveguide filament around waveguide filament.Be furnished with a float outside the sensor measuring staff of magnetostrictive liquid level meter, this float can move up and down along measuring staff in the variation with liquid level.One group of permanent magnet ring is arranged in float inside.When meet in the magnet ring magnetic field of impulse current magnetic field and float generation, thereby the magnetic field around float changes and makes the waveguide filament of being made by magnetostriction materials produce a torsional wave pulse in the position at float place, can determine the position at float place by the mistiming of pulsed current measurement and torsional wave, i.e. the position of liquid level.Yet, the magnetic field that the magnetostrictive liquid level meter produces is subject to the interference in other magnetic field, when neighbouring when the place of the strong electromagnetic radiations such as power plant is arranged, the precision of magnetostrictive liquid level meter reduces greatly, and, the magnetostrictive liquid level meter is mainly the fluid level measuring gauge for the hold-up vessel design of large-scale petroleum, industrial chemicals, its size is larger, usually reaches ten several meters, even tens of rice, can not on the container less at volume, use, in addition, the complex structure of magnetostrictive liquid level meter, expensive, maintenance difficult, limited its usable range.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, a kind of fluid level measuring gauge for totally-enclosed pressure environment is provided, this fluid level measuring gauge can accurately be told the particular location of liquid level under the rugged surroundings such as High Temperature High Pressure, its antijamming capability is strong, and simple in structure, production cost is low, is a kind of fluid level measuring gauge applied widely.
The purpose of this utility model is achieved in that
A kind of fluid level measuring gauge for totally-enclosed pressure environment, comprise outer tube, heater strip, thermopair, the forward end seal of described outer tube, described heater strip, thermopair is located in the pore of outer tube, heater strip is positioned on the axial line of outer tube, two terminals welding leads of heater strip, lead-in wire extends outer tube, the quantity of described thermopair is a plurality of, a plurality of thermopairs are evenly arranged in the surrounding of heater strip, distance between the front end of a plurality of thermopairs and outer tube front end end face is arithmetic progression, outer tube is extended in the rear end of a plurality of thermopairs, the thermo wires welding compensating line of a plurality of thermopairs rear end, described thermopair, fill insulant between heater strip and outer tube, the rear end of described outer tube seals with insulating material.
Described heater strip takes the shape of the letter U, and the rear end of heater strip is terminals, and the diameter of heater strip is 1.1～1.2mm.
Described thermopair is armoured thermocouple, and the diameter of thermopair is 0.6～1.0mm.
Distance between described a plurality of thermopair front end and outer tube front end end face is in the clockwise direction or counterclockwise the ascending order that differs 4～5mm and arranges.
Described a plurality of thermopairs rear end cover has a sealed tube, the weld of 4～5mm place, thermopair rear end and thermo wires, compensating line all in sealed tube, sealant pouring and sealing between the weld of thermopair rear end, thermo wires, compensating line and sealed tube.
The compensating line of described a plurality of thermopairs adopts reverse serial connection method.
Be furnished with a connection piece on the periphery of described outer tube rear end, also be furnished with a cutting ferrule for being connected with tested container simultaneously.
Threaded engagement one terminal box on described web member, the compensating line of described a plurality of thermopairs and the lead-in wire of heater strip all are connected with the connection terminal of terminal box.
The front end welding plug sealing of described outer tube.
The rear end sealant pouring and sealing of described outer tube.
Owing to having adopted such scheme, this fluid level measuring gauge comprises outer tube, heater strip, thermopair, the forward end seal of outer tube, this end of outer tube inserts in tested container, the end face of this end of outer tube is immersed in the liquid in tested container, heater strip, thermopair is located in the pore of outer tube, heater strip is positioned on the axial line of outer tube, evenly heating towards periphery, two terminals welding leads of heater strip, lead-in wire extends outer tube, with electric supply installation, be connected, the quantity of thermopair is a plurality of, a plurality of thermopairs are evenly arranged in the surrounding of heater strip, the multimetering temperature, distance between the front end of a plurality of thermopairs and outer tube front end end face is arithmetic progression, make the position difference of different thermopairs apart from liquid level, when the hot junction of thermopair is positioned at the liquid level below, because radiating rate is very fast, temperature is lower, when the hot junction of thermopair is positioned at the liquid level top, because radiating rate is slower, temperature is higher, the hot junction of thermopair produces the induction electromotive force that step changes, the judgement liquid level is between the hot junction of which two thermopair, and then the particular location of judgement liquid level.Outer tube is extended in the rear end of a plurality of thermopairs, and the thermo wires welding compensating line of a plurality of thermopairs rear end, make the precision of thermopair higher, and error is less.Fill insulant between described thermopair, heater strip and outer tube, insulating material cuts off heater strip and thermopair and outer tube on the one hand, prevents electric leakage, guarantees the reception of hot thermocouple electromotive force signal, plays on the other hand heat conduction.The rear end of described outer tube seals with insulating material, prevents electric leakage, and the leakage of the material in outer tube, can also extend the thermopair of outer tube and the lead-in wire of heater strip, prevents the generation of the situations such as movement, fracture.
Heater strip takes the shape of the letter U, and the rear end of heater strip is terminals, the space minimum that the heater strip of U-shaped takies, and the minimum of dwindling this fluid level measuring gauge allows diameter, adapts to less closed container.
Thermopair is armoured thermocouple, and armoured thermocouple can be crooked, high pressure resistant, thermal response time is fast and sturdy and durable.The diameter of thermopair is 0.6～1.0mm, and the minimum of dwindling this fluid level measuring gauge allows diameter, adapts to less closed container.
Distance between a plurality of thermopair front ends and outer tube front end end face is in the clockwise direction or counterclockwise the ascending order that differs 4～5mm and arranges, this arrangement mode is convenient to Installation and Measurement, while between the hot junction of adjacent heat galvanic couple, differing 4～5mm, temperature difference is more obvious, and resolution is higher.
A plurality of thermopairs rear end cover has a sealed tube, and the weld of 4～5mm place, thermopair rear end and thermo wires, compensating line is all in sealed tube, and sealant pouring and sealing between the weld of thermopair rear end, thermo wires, compensating line and sealed tube, prevents electric leakage.
The compensating line of a plurality of thermopairs adopts reverse serial connection method.The like poles that are about to thermopair are connected, and form the elementary errors thermopair, by △ E=E (t1, t0)-E (t2, t0)=E (t1, t2), react two point for measuring temperature (t2, t1) temperature difference, determine the particular location of liquid level with this, measures more quick.
Be furnished with a connection piece on the periphery of outer tube rear end, threaded engagement one terminal box on web member also is furnished with a cutting ferrule for being connected with tested container simultaneously.The cutting ferrule body is provided with for the external thread with the tested container threaded engagement, makes this fluid level measuring gauge fixing with the tested container sealing, is convenient to install.
The compensating line of described a plurality of thermopairs and the lead-in wire of heater strip all are connected with the connection terminal of terminal box.Terminal box is connected with power supply and surveying instrument etc., easy to connect, and safer.
The front end welding plug sealing of outer tube, isolated with fluid to be measured, prevent that fluid to be measured and this fluid level measuring gauge from producing pollution.
Described fluid level measuring gauge is comprised of a heater strip and a plurality of armoured thermocouple.Because heater strip maintains firm power as heating element, there is good stability, armoured thermocouple has good accuracy and reliability, and therefore, this fluid level measuring gauge can be used in totally-enclosed environment and carries out thermometric.Fluid level measuring gauge of the present invention can accurately judge the position of liquid level under High Temperature High Pressure, and this fluid level measuring gauge repdocutbility is fine, and resolution is high, and unitarity is good, can meet the requirements such as overload test, and interference performance is strong, and proves by experiment.And this fluid level measuring gauge technique is simple, and production cost is low, it is a kind of fluid level measuring gauge that can promote.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
The accompanying drawing explanation
Fig. 1 is the structural representation for totally-enclosed pressure environment fluid level measuring gauge;
The partial enlarged drawing that Fig. 2 is P place in Fig. 1;
Fig. 3 is the cross sectional representation for totally-enclosed pressure environment fluid level measuring gauge.
In accompanying drawing, 1 is outer tube, and 2 is heater strip, and 3 is thermopair, and 4 is lead-in wire, and 5 is compensating line, and 6 is sealed tube, and 7 is web member, and 8 is terminal box, and 81 is connection terminal.
Embodiment
Referring to Fig. 1～Fig. 3, a kind of embodiment for the fluid level measuring gauge for totally-enclosed pressure environment, this fluid level measuring gauge comprises outer tube 1, heater strip 2, thermopair 3, the material of described outer tube adopts the 316L stainless steel, the forward end seal of described outer tube 1, further, the plug sealing of the front end of described outer tube welding 316L stainless steel material.Except effectively having adapted to hermetically sealed environment resistance to elevated temperatures and decay resistance, also the making for this fluid level measuring gauge provides great convenience, the most important thing is to guarantee accuracy and the reliability of level gauging.Described heater strip 2, thermopair 3 are located in the pore of outer tube 1, heater strip 2 is positioned on the axial line of outer tube 1, it is 1400 ℃ that described heater strip adopts fusing point, and density is 8.4 grams/cubic millimeter, extensibility >=20, resistivity 1.09 ± 0.05 μ Ω .m, coefficient of heat conductivity is 60.3kj/m.h ℃, and the metal material that linear expansion coefficient is 18, for resistance is reliable, stable, in the present embodiment, select Ni20Cr80 as heater strip.The diameter of heater strip 2 is 1.1～1.2mm.Described heater strip 2 takes the shape of the letter U, the front end of heater strip is the place that turns back, the place of turning back is to being filled with electric smelting level magnesium oxide between the plug of outer tube front end, its purity >=99.5%, the plug sealing that the place of turning back connects by the arc-welding argon welding to the electric smelting level magnesium oxide of filling between the plug of outer tube front end, in the present embodiment, the place of turning back is 5mm to the distance between the plug inner face of outer tube front end.The rear end of heater strip 2 is terminals, two terminals welding leads 4 of heater strip 2, lead-in wire 4 extends outer tube 1, in the present embodiment, described heater strip at 50mm place, distance outer tube rear end together with wire bonds, it is 1435～1446 ℃ that the material of lead-in wire adopts fusing point, proportion is 8.80～8.95, coefficient of heat conductivity is 0.56～0.65(100 ℃) card/centimetre. second. ℃, the metal material that resistance coefficient is 9.2 μ Ω .cm～9.7 μ Ω .cm (20 ℃), in the present embodiment, select nickel down-lead that resistivity the is low extension line as heating element.
Described thermopair 3 is armoured thermocouple 3, and the diameter of thermopair 3 is 0.6～1.0mm.The quantity of described thermopair 3 is a plurality of, and a plurality of thermopairs 3 are evenly arranged in the surrounding of heater strip 2, in the present embodiment, selects 10 thermopairs to carry out thermometric, in order to judge accurately liquid level position.Distance between the front end of a plurality of thermopairs 3 and outer tube 1 front end end face is arithmetic progression, further, distance between described a plurality of thermopair 3 front ends and outer tube 1 front end end face is in the clockwise direction or counterclockwise the ascending order that differs 4～5mm and arranges, in the ascending order direction, differ 4～5mm between the adjacent heat galvanic couple, in the present embodiment, between the adjacent heat galvanic couple, differ 5mm.A plurality of thermopairs are more than or equal to heater strip apart from the distance between outer tube front end end face apart from the distance between outer tube front end end face, so that the hot junction of each thermopair front end equates with the spacing between heater strip.In the present embodiment, apart from outer tube front end end face, the hot junction of nearest thermopair flushes with the place of turning back of heater strip front end.It is 0.8 * 10 that the negative pole thermocouple wire of described armoured thermocouple adopts temperature-coefficient of electrical resistance
-3/ ℃～1.25 * 10
-3/ ℃, NiSi3, Alumel or Nisil thermo wires that resistivity is 0.21 μ Ω .m～0.33 μ Ω .m; It is 0.9 * 10 that anodal thermocouple wire adopts temperature-coefficient of electrical resistance
-3/ ℃～1.16 * 10
-3/ ℃, NiCr10, Chromel or Nicrosil thermo wires that resistivity is 0.63 μ Ω .m～0.82 μ Ω .m.Outer tube 1 is extended in the rear end of a plurality of thermopairs 3, this end of thermopair strips out thermo wires, the thermo wires welding compensating line 5 of a plurality of thermopairs 3 rear ends, further, described a plurality of thermopair 3 rear end covers have a sealed tube 6, the weld of 4～5mm place, thermopair rear end and thermo wires, compensating line 5 all in sealed tube, sealant pouring and sealing between the weld of thermopair rear end, thermo wires, compensating line and sealed tube.The compensating line 5 of described a plurality of thermopair 3 adopts reverse serial connection method, the like poles that are about to thermopair are connected, form the elementary errors thermopair, by △ E=E (t1, t0)-E (t2, t0)=E (t1, t2), react the temperature difference of two points for measuring temperature (t2, t1), with this, determine the particular location of liquid level.
Fill insulant between described thermopair 3, heater strip 2 and outer tube 1, in the present embodiment, described insulating material is electric smelting level magnesium oxide, its purity >=99.5%, impurity F e, the content of Ca and Mn is respectively: Fe≤0.007%, Ca≤0.12%, Mn≤0.003%.Insulating material makes effectively to insulate and separate between each thermopair and outer tube, guarantees the reception of hot thermocouple electromotive force signal.The rear end of described outer tube 1 seals with insulating material, further, the rear end sealant pouring and sealing of described outer tube 1, in the present embodiment, sealant pouring and sealing adopts E-7 glue.Be fixed with a web member 7 for being connected with tested container on the periphery of described outer tube 1 rear end, in the present embodiment, described web member in the form of a ring, the center pit of web member is shoulder hole, web member is socketed on outer tube, the end face of web member center pit miner diameter end and the end contact of outer tube rear end, the outer tube web member is fixed by sealant pouring and sealing.Be furnished with a connection piece on the periphery of described outer tube rear end, also be furnished with a cutting ferrule for being connected with tested container simultaneously.The cutting ferrule body is provided with for the external thread with the tested container threaded engagement, and this fluid level measuring gauge is fixedly connected with tested container.During concrete test, at first determine test position, then screw cutting ferrule, allow fluid level measuring gauge by cutting ferrule and tested container fixed seal connection.Threaded engagement one terminal box 8 on described web member 7, described terminal box is provided with internal thread, and web member is provided with the external thread for coordinating with terminal box.The compensating line 5 of described a plurality of thermopair 3 and the lead-in wire 4 of heater strip 2 all are connected with the connection terminal 81 of terminal box 8.Described 10 armoured thermocouple lead ends are pressed clockwise Heterogeneous Permutation successively at the sealed tube place, be beneficial to wiring.Described fluid level measuring gauge terminals are placed in terminal box, and are distributed with 11 pairs of terminals in terminal box, and wherein 10 pairs of terminals are for accessing the compensating line of armoured thermocouple, and 1 pair of terminal is for connecing the lead-in wire of heater strip.
Will for the fluid level measuring gauge of totally-enclosed pressure environment by cutting ferrule be fixed on tested container just, the front end of outer tube inserts in the liquid in tested container, during work, heater strip is supplied to a direct current constant current or constant voltage source, in the present embodiment, with YJ26M tri-road direct current stabilizers, be provided with the voltage of 5.62V to the heating element in the liquid level meter.After its operating voltage or current stabilization, record the potential value of armoured thermocouple.10 armoured thermocouples are drawn from terminals, and the access switch, then measure its potential value with the HP34401A digital voltmeter.Observe the situation of change of 10 armoured thermocouple electromotive forces, liquid level produces between the hot junction of two thermopairs that step changes at potential value, and then judges the particular location of liquid level in tested container.
Replica test:
After stable operating voltage, the 10# armouring thermocouple of take is reference point, after the 1st armoured thermocouple location positioning, every 3 minutes, fluid level measuring gauge is slowly inserted to 5mm in boiling water, observes the situation of change of 10 armoured thermocouple potential values.# means that, in boiling water, it the results are shown in Table 1.
Table 1
This fluid level measuring gauge response time fast (3min.) as can be seen from Table 1, the hot junction of thermopair potential value when gas phase is inserted liquid or pull out in gas phase from liquid changes greatly, resolution is high, repdocutbility is good, and 10 armoured thermocouples can be told Air Interface and liquid surface accurately.
Performance test:
In order further to test the performance of fluid level measuring gauge, with YJ26M tri-road direct current stabilizer power supplys, pass to the DC constant voltage power supply to the fluid level measuring gauge that a resistance is 12.7 Ω, after electromotive force is stable, measure the potential value of 10 armoured thermocouples, then take the 10# armoured thermocouple as reference point, this fluid level measuring gauge slowly is placed in boiling water, allows slowly submergence thermojunction of boiling water, the variation of measuring fluid level measuring gauge inner armor thermopair potential value with the HP34401A digital voltmeter.Change voltage swing, repeat top process of the test, its test findings is in Table 2.
Table 2
As can be seen from Table 2: along with the increase of voltage, the power of this fluid level measuring gauge constantly increases, and the temperature of its heating element heating is higher, and, along with the rising of temperature, its temperature difference in boiling water is also increasing, and we just more easily differentiate liquid-gas interface.Test findings shows that this fluid level measuring gauge liquid level resolution is higher, and reliability is also very high.
The unitarity test:
Get 2 fluid level measuring gauges and detected, 2 fluid level measuring gauges be numbered J-1# and J-2#, concrete testing result is in Table 3, from the heating element test result, its resistance deviation is 0.02, the fluid level measuring gauge consistance is fine.Armoured thermocouple is got on from terminal, investigate not by reverse serial connection method the consistance of fluid level measuring gauge and the resolution of liquid gas interface.
Table 3
From the data of table 3, show, the consistance of fluid level measuring gauge and liquid gas interface resolution are all very high, can reappear and can be used in the position that liquid-gas interface is differentiated liquid level.
With YJ26M tri-road direct current stabilizers, be provided with the voltage of 5.62V to 2 fluid level measuring gauges, after stable operating voltage, successively three times fluid level measuring gauge is placed on to repetition test under boiling water and room temperature, every armoured thermocouple is tested separately, its potential value is after a moment step decline, and then be continuous downtrending, until reach steady state (SS).Measure its potential value with the HP34401A digital voltmeter, its test findings is in Table 4.
Table 4
2 fluid level measuring gauge high conformities of embodiment 2 gained as can be seen from Table 4, and the response time is fast, and the step of potential value changes greatly, can well tell liquid gas interface.
In order further to test the performance of fluid level measuring gauge, with YJ26M tri-road direct current stabilizer power supplys, pass to the DC constant voltage power supply to 2 fluid level measuring gauges, after electromotive force is stable, measure its potential value, then this fluid level measuring gauge is placed in boiling water, measures the variation of its potential value with the HP34401A digital voltmeter.Change the size of voltage, repeat top process of the test, its test findings is in Table 5.
Table 5
As can be seen from Table 5: along with the increase of voltage, the power of fluid level measuring gauge also constantly increases, and the temperature of its heating is also higher.And, with the rising of temperature, its temperature difference in boiling water is also increasing.It can also be seen that from test findings 2 fluid level measuring gauge consistance are fine, and can both clearly tell liquid level.
When the load voltage of fluid level measuring gauge is greater than 12V, give 2 above-mentioned fluid level measuring gauge heating 2 hours, then tested the potential value of one group of armoured thermocouple every 1 minute with the DT9505 multi-function multimeter, after test completes, the break-make situation of multimeter test heater strip for outage, see whether heating element and armoured thermocouple open circuit because of overload.Its test findings is in Table 6.
Table 6
From table 6, can see: this fluid level measuring gauge still stands intact about 730 ℃ work in 2 hours, so this fluid level measuring gauge comprises 10 armoured thermocouples, can meet the thermometric requirement of 0 ℃～350 ℃ fully.
The utility model not only is confined to above-described embodiment, in the situation that do not deviate from the technical scheme that the technical solutions of the utility model spirit is carried out a little change, should fall into protection domain of the present utility model.
Claims (10)
1. the fluid level measuring gauge for totally-enclosed pressure environment, it is characterized in that: comprise outer tube, heater strip, thermopair, the forward end seal of described outer tube, described heater strip, thermopair is located in the pore of outer tube, heater strip is positioned on the axial line of outer tube, two terminals welding leads of heater strip, lead-in wire extends outer tube, the quantity of described thermopair is a plurality of, a plurality of thermopairs are evenly arranged in the surrounding of heater strip, distance between the front end of a plurality of thermopairs and outer tube front end end face is arithmetic progression, outer tube is extended in the rear end of a plurality of thermopairs, the thermo wires welding compensating line of a plurality of thermopairs rear end, described thermopair, fill insulant between heater strip and outer tube, the rear end of described outer tube seals with insulating material.
2. the fluid level measuring gauge for totally-enclosed pressure environment according to claim 1, it is characterized in that: described heater strip takes the shape of the letter U, and the rear end of heater strip is terminals, and the diameter of heater strip is 1.1～1.2mm.
3. the fluid level measuring gauge for totally-enclosed pressure environment according to claim 1, it is characterized in that: described thermopair is armoured thermocouple, and the diameter of thermopair is 0.6～1.0mm.
4. according to the described fluid level measuring gauge for totally-enclosed pressure environment of claim 1 or 3, it is characterized in that: the distance between described a plurality of thermopair front ends and outer tube front end end face is in the clockwise direction or counterclockwise the ascending order that differs 4～5mm and arranges.
5. according to the described fluid level measuring gauge for totally-enclosed pressure environment of claim 1 or 3, it is characterized in that: described a plurality of thermopairs rear end cover has a sealed tube, the weld of 4～5mm place, thermopair rear end and thermo wires, compensating line all in sealed tube, sealant pouring and sealing between the weld of thermopair rear end, thermo wires, compensating line and sealed tube.
6. according to the described fluid level measuring gauge for totally-enclosed pressure environment of claim 1 or 3, it is characterized in that: the compensating line of described a plurality of thermopairs adopts reverse serial connection method.
7. the fluid level measuring gauge for totally-enclosed pressure environment according to claim 1 is characterized in that: be furnished with a connection piece on the periphery of described outer tube rear end, also be furnished with a cutting ferrule for being connected with tested container simultaneously.
8. the fluid level measuring gauge for totally-enclosed pressure environment according to claim 7, it is characterized in that: threaded engagement one terminal box on described web member, the compensating line of described a plurality of thermopairs and the lead-in wire of heater strip all are connected with the connection terminal of terminal box.
9. the fluid level measuring gauge for totally-enclosed pressure environment according to claim 1, is characterized in that: the front end welding plug sealing of described outer tube.
10. the fluid level measuring gauge for totally-enclosed pressure environment according to claim 1, is characterized in that: the rear end sealant pouring and sealing of described outer tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203489082U CN203337218U (en) | 2013-06-18 | 2013-06-18 | Liquid-level measuring meter for totally-closed pressure environment |
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| CN2013203489082U CN203337218U (en) | 2013-06-18 | 2013-06-18 | Liquid-level measuring meter for totally-closed pressure environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI588452B (en) * | 2014-12-02 | 2017-06-21 | Fujikin Kk | Liquid level detecting circuit, liquid level meter, container having the same, and vaporizer using the same |
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2013
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI588452B (en) * | 2014-12-02 | 2017-06-21 | Fujikin Kk | Liquid level detecting circuit, liquid level meter, container having the same, and vaporizer using the same |
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