CN1312462C - Two-wire system multiple sensors liquid level transmitting instrument - Google Patents
Two-wire system multiple sensors liquid level transmitting instrument Download PDFInfo
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- CN1312462C CN1312462C CNB2004101039325A CN200410103932A CN1312462C CN 1312462 C CN1312462 C CN 1312462C CN B2004101039325 A CNB2004101039325 A CN B2004101039325A CN 200410103932 A CN200410103932 A CN 200410103932A CN 1312462 C CN1312462 C CN 1312462C
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Abstract
The present invention discloses a two-wire system multiple sensor liquid level transducer which comprises an upper part sensor which is an absolute pressure sensor and used for measuring gas pressure values above a liquid level, a lower part sensor which is also an absolute pressure sensor and used for measuring the total pressure of a measured point in liquid medium and a sigal processing device which is used for processing data of the upper and the lower part sensors, wherein the upper and the lower part sensors are connected with the sigal processing device, and a wire connecting terminal of the lower part sensor is provided with a sealing structure. Compared with a traditional liquid level measuring device, the present invention has the advantages of no moisture condensation, good sealing performance, etc.
Description
Technical field
The present invention relates to a kind of throw-in type multisensor liquid level emasuring device.
Background technology
Traditional fluid level measuring instrument is to adopt single the differential pressure pickup that has the back pressure pipe, differential pressure pickup is installed in feeler lever or cable bottom, during use sensor is dropped in the water, differential pressure pickup tracer liquid medium internal pressure and atmospheric pressure, the two pressure difference is transferred to signal processing apparatus, and signal processing apparatus draws required level value according to liquid pressure formula P=ρ gh.Therefore because using and installing very simple and conveniently of this fluid level measuring instrument is widely used in numerous areas such as waterpower, electric power, metallurgy and wastewater treatment.But since this fluid level measuring instrument in use its differential pressure pickup back pressure pipe must be communicated with atmosphere, therefore need to use the cable and the differential pressure pickup that have wireway to be electrically connected, thereby have condensation trouble:
(1) remaining water vapor is often arranged in the wireway, when temperature descended, these water vapor can condense into water droplet, dropped to the differential pressure pick-up surface, caused the differential pressure pick-up cisco unity malfunction;
(2) if the interior remaining water vapor of wireway is many, when temperature descended, the water droplet that steam coagulation becomes can accumulate in and form water column together, and the back pressure side that the pressure meeting of this section water column and atmospheric pressure are attached to differential pressure pick-up together causes measuring and forbidden.
These people many measures have been taked, solve the problems referred to above, if any employing macromolecule sieve filtered air in steam, what have adorns drying agent in sensor shell, that have even in snorkel, fill high purity inert gas, though these methods can be alleviated condensation trouble to a certain extent, have inefficacy and non-confirmability, can not fundamentally solve condensation trouble.In addition; owing to have to use the cable that has wireway; when cable being sealed locking, if firmly will push wireway slightly greatly, causing it can not communicate with atmosphere smoothly; influence measurement result; Suo Jin dynamics must be controlled like this, but simultaneously, if the power of locking cable is too little; Seal of Cables just has the problem of leakage failure, and classic method can't solve the contradiction of protection wireway and cable seal.
In sum, there is following defective in existing various throw-in type fluid level measuring instruments:
1, owing in the air guide cable snorkel is arranged, therefore there is serious condensation trouble;
2, owing in the air guide cable snorkel is arranged, therefore limited the locking force when sealing, thereby influenced sealing effectiveness;
3, owing to only use a differential pressure pickup to experience pressure, therefore the density of the liquid medium of surveying must be steady state value, just can accurately measure and converse the liquid level value, become and send output, in case liquid in containers density changes to some extent, become so that to send the liquid level of output will no longer be true liquid level, under the unsettled situation of Media density, just do not have measurement accuracy;
4, because the limitation of differential pressure pickup self can only be carried out observing and controlling to the liquid level of open-top receptacle, measurement function is single.
5, the variation of hydraulic pressure can only be measured passively, pressure numerical value and subsurface total pressure numerical value that liquid level is above can't be learnt.
More than these problems perplexing each big manufacturer and users for a long time, need to be resolved hurrily.
Summary of the invention
Problem at prior art exists the purpose of this invention is to provide a kind of no dewfall, favorable sealing property, and measurement range is wide, precision is high, stable performance, two-wire system multiple sensors liquid level transmitting instrument easy to adjust.
For achieving the above object, at least two absolute pressure sensors of two-wire system multiple sensors liquid level transmitting instrument utilization of the present invention are measured pressure values and the liquid level top atmospheric pressure value in the liquid medium respectively, by signal processing apparatus the measured value of each sensor is handled then, draw required level value, it comprises:
Upper sensor is used to measure liquid level top atmospheric pressure value, is absolute pressure sensor;
Lower sensor is used to measure place, measured point total pressure in the liquid medium, is absolute pressure sensor;
Signal processing apparatus is handled the data of upper and lower part sensor measurement;
Upper sensor, lower sensor link to each other with signal processing apparatus, and lower sensor connection terminal place has hermetically-sealed construction.
Further, described lower sensor is two, is positioned at different liquid levels during measurement.
Further, the hermetically-sealed construction that described lower sensor has comprises a housing, and lower sensor is fixed in this housing, and its pressure-sensitive face is connected with extraneous, and its lead is drawn the position sealing and fixing.
Further, described hermetically-sealed construction also comprises keeper and seal, and lower sensor is positioned at housing, is fixed by keeper, passes through the seal sealing and fixing between lower sensor and extension line thereof and the housing.
Further, described housing is a cylindrical shape, comprise lower sensor construction section and the lead section of drawing two parts, the housing two ends are provided with screw thread, the inwall of lower sensor construction section is provided with projection, and set nut matches with projection lower sensor is gripped, and set nut is provided with the pressure-sensitive that can make lower sensor and the through hole that is in communication with the outside, can be provided with screen cloth in this through hole, between lower sensor and housing, be provided with O-ring seal; The inner chamber of the lead section of drawing be along its axis direction "
" shape, comprise two double cone faces, wherein a side is by inner seal ring and the female compacting sealing of locking wire, and opposite side seals by clamping sleeve extruding tail pipe seal with double-cone pad by last locknut or by last locknut.
Further, the tortuous bifurcated of through hole on the set nut of described lower sensor construction section ground is in communication with the outside, and can constitute by the direct straight hole that links to each other with the pressure-sensitive face of lower sensor with the perpendicular right-angled intersection hole of this straight hole.
Further, described signal processing apparatus is arranged in the casing, and casing is provided with display and output port, and the lead of lower sensor is introduced casing and is connected with the input end of signal processing apparatus, upper sensor is fixed in the casing, and its pressure-sensitive face directly or by pipeline is in communication with the outside; Described upper and lower sensor can be 86 type sensors or 1210 type sensors
Further, measuring process at the beginning, the enabling signal treating apparatus carries out the initialization of system;
Read the voltage signal of upper sensor, the voltage signal of upper sensor goes out corresponding pressure values P1 through the A/D conversion Calculation;
Read the voltage signal of lower sensor, the voltage signal of lower sensor goes out corresponding pressure values P2 through the A/D conversion Calculation;
Fluid density value ρ and gravity acceleration value g that P1, P2 that the program basis measures and program preset calculate liquid level h;
The total pressure P2 that shows measured point under the level value h that calculates and pressure P1 more than the liquid level that measures and the liquid level;
Program loop repeats said process, reflects liquid level numerical value in real time.
Further, lower sensor is two, is positioned at differing heights, measuring process at the beginning, the program of enabling signal treating apparatus is carried out the initialization of system;
Read the voltage signal of upper sensor, the voltage signal of upper sensor goes out corresponding pressure values P1 through the A/D conversion Calculation;
Read the voltage signal of lower sensor, its voltage signal goes out corresponding pressure values P2 through the A/D conversion Calculation;
Read the voltage signal of another lower sensor, its voltage signal goes out corresponding pressure values P2 through the A/D conversion Calculation;
Gravity acceleration value that P2, P3 that the program basis measures and program preset and the fixed range h between the lower sensor
0, calculate the density p of liquid medium;
The density p of the liquid medium that the application aforementioned calculation obtains in conjunction with pressure values P3 and P1, calculates the vertical range h of liquid level range sensor, i.e. level value;
Program loop repeats said process, reflects liquid medium density and liquid level numerical value in real time.
The utility model is designed to the throw-in type fluid level measuring instrument to have the structure of lower sensor, the sensor on top is used for measuring the above air pressure of liquid level specially, be atmospheric pressure or tank pressure, the sensor of bottom is used for surveying stagnation pressure, be atmospheric pressure or tank pressure and hydraulic pressure and, so just can accurately measure the differential pressure of liquid medium, and two sensors are absolute pressure sensor, there is not the back pressure pipe, need not to use the air guide cable to be communicated with, therefore compare and have following advantage with the traditional liquid level surveying instrument with atmosphere on the liquid level:
1, owing to do not have snorkel in the cable, therefore condensation trouble can not appear;
2, owing to be not subjected to the restriction of snorkel, therefore can strengthen coupling mechanism force when sealing, improve sealing property, multi-sealing structure makes that sealing is more reliable;
3, owing to adopted absolute pressure sensor, therefore not only can be used for open-top receptacle, also can be used for level gauging with pressure vessel.
4, a plurality of lower sensors can in time be sensed the variation of measured medium density, and the density that converts after changing can accurately draw true liquid level.
Description of drawings
Fig. 1 is the structured flowchart of two-wire system multiple sensors liquid level transmitting instrument of the present invention;
Fig. 2 measures the principle schematic of open-top receptacle liquid level for the present invention adopts dual sensor;
Fig. 3 measures the principle schematic of closed vessel liquid level for the present invention adopts dual sensor;
Fig. 4 adopts the principle schematic of three sensor measurement liquid levels for the present invention;
Fig. 5 is the encapsulation synoptic diagram of lower sensor of the present invention;
Fig. 6 is the schematic appearance of detecting head among first embodiment;
Fig. 7 is the cross-sectional schematic of detecting head among first embodiment;
Fig. 8 is the schematic appearance of upper housing;
Fig. 9 is the scheme of installation of upper sensor;
Figure 10 is for adopting two structural representations that sensor is measured the open-top receptacle liquid level;
Figure 11 is for adopting three structural representations that sensor is measured the open-top receptacle liquid level;
Figure 12 is for adopting two structural representations that sensor is measured closed vessel liquid level;
Figure 13 is for adopting three structural representations that sensor is measured closed vessel liquid level;
Figure 14 adopts the FB(flow block) of dual sensor measuring liquid level for the present invention;
FB(flow block) when Figure 15 adopts three sensor measurement liquid levels for the present invention;
Figure 16 is second kind of scheme of installation of upper sensor;
Figure 17 is the third scheme of installation of upper sensor;
Figure 18 is the structural representation that the lead extension of detecting head only seals with tail pipe seal with double-cone pad;
Figure 19 adopts the structural representation of the nut location that has through hole with the sealing of tail pipe seal with double-cone pad, lower sensor for the lead extension of detecting head;
Figure 20 is the structural representation that the lead extension of detecting head only seals with inner seal ring;
Figure 21 is the structural representation that the lead extension of detecting head only seals with the cone seal plug;
Figure 22 is the synoptic diagram that the cylindrical shell of detecting head adopts segmentation structure.
Embodiment
As shown in Figure 1, the present invention adopts two absolute pressure sensors to measure pressure values in the liquid medium and the atmospheric value above the liquid level respectively when measuring liquid level, position more than liquid level is provided with an absolute pressure sensor that is used for initiatively measuring the above atmospheric value of liquid level, the place is provided with an other absolute pressure sensor that is used to measure the following total pressure of liquid level in the measured point, be that the above pressure of liquid level adds the liquid pressure sum, signal processing apparatus records after the atmospheric pressure and the total pressure below the liquid level more than the liquid level by two absolute pressure sensors, calculate the above atmospheric difference DELTA P of total pressure and liquid level, it is the hydraulic pressure value, utilize liquid pressure formula P=ρ gh to converse level value again, show then or become and send output.Owing to locate on ground, atmospheric pressure is along with the increase of sea level elevation slightly descends, according to the data of meteorological aspect, 100 meters of the every increases of place near the ground height above sea level, the air pressure 1000Pa that approximately descends, this draught head is equivalent to the hydraulic pressure value of 10mm water column, therefore for rough measurement, can think L=Δ P/ ρ * g, for accurate measurement, the atmospheric pressure that can record upper sensor and the atmospheric difference at liquid level place compensate, thereby improve the precision of level gauging.Generally speaking, fluid density ρ and acceleration of gravity h be given value when measuring, and be more accurate for making measurement, also can measure fluid density and gravity acceleration value and input to signal processing apparatus then and convert synchronously in measurement pressure.
As shown in Figure 2, when measuring the open-top receptacle liquid level, top absolute pressure sensor 1 is set measures atmospheric pressure, an other absolute pressure sensor 2 is set below liquid level measures the total pressure at place, measured point, converse the liquid level of fluid to be measured in the open-top receptacle by the difference of calculating the two, the pressure-sensitive face of top absolute pressure sensor 1 can directly or by ventilation medium and atmosphere be connected, and this ventilation medium can be the macromolecular filtering device.
As shown in Figure 3, when measuring closed vessel liquid level, top absolute pressure sensor 3 is set measures the above atmospheric pressure value of liquid level in the closed container, an other absolute pressure sensor 4 is set below liquid level measures the total pressure at place, measured point, converse the liquid level of fluid to be measured in the closed container by the difference of calculating the two, the pressure-sensitive face of top absolute pressure sensor can be connected by ventilation medium and the above gas of liquid level, if the liquid in the closed container is volatile medium, then the pressure-sensitive face of top absolute pressure sensor should be directly and the above gas of liquid level connect, medium with non-volatile stops up breather line, influences measurement result.
As shown in Figure 4, when measured medium density changes, differing heights place below liquid level is provided with two absolute pressure sensors 5 and 6, because both distances are given value, therefore the pressure difference by two place's liquid levels compares, can calculate measured medium density by signal processing apparatus, and then converse level value.
Two-wire system multiple sensors liquid level transmitting instrument of the present invention, mainly constitute by upper sensor, lower sensor, detecting head and signal processing apparatus, wherein the pressure-sensitive face of upper sensor is connected with extraneous, its lead is connected with the input end of signal processing apparatus, lower sensor is installed in the detecting head hermetically, its pressure-sensitive face is connected with extraneous, lead is outwards drawn with the input end of signal processing apparatus in the detecting head and is connected, for in time measuring measured medium density, lower sensor can be two, is installed in respectively in the detecting head of differing heights.
As shown in Figure 5, detecting head mainly is made of housing 7, keeper 8 and seal 9,10, lower sensor 11 is positioned at housing 7, fixing by keeper 8, have the opening that is in communication with the outside on the keeper 8, the pressure-sensitive face of lower sensor 11 is in communication with the outside, seals by seal 9,10 between lower sensor 11 and extension line 12 thereof and the housing 7.
As Fig. 6, first embodiment shown in Figure 7, housing 21 is a cylindrical shape, constitute by lower sensor construction section and the lead section of drawing two parts, two ends are provided with screw thread, the inwall of lower sensor construction section is provided with projection 22, set nut 23 makes itself and projection 22 compress the location by clamping sleeve 24 extruding lower sensors 25, set nut 23 is provided with the through hole 26 that the pressure-sensitive face that can make lower sensor 25 is in communication with the outside, be provided with screen cloth 27 in this through hole 26, lower sensor 25 is 86 type sensors; The inner chamber of the lead section of drawing on the longitudinal section, be "
" shape; comprise two double cone faces, middle path place's size and sensor conductor match, and cable 28 just can pass and get final product; path place one side is by inner seal ring 29 and the female 30 compactings sealing of locking wire, and opposite side is sealed by clamping sleeve 32 extruding tail pipe seal with double-cone pads 33 by last locknut 31.The tortuous bifurcated of through hole on set nut ground is in communication with the outside, and constitutes by the direct straight hole 26 that links to each other with the pressure-sensitive face of lower sensor with the perpendicular right-angled intersection hole of this straight hole.
As Fig. 8, shown in Figure 9, signal processing apparatus 34 is arranged in the casing 35, casing 35 is provided with display 36 and covert output port, the cable 28 of lower sensor passes cover 38 and is connected with the input end of signal processing apparatus 34 with threaded connector 37 introducing casings 35, have through hole on the sidewall of threaded connector 37, upper sensor 38 is 1210 type sensors, is fixed in this through hole, and its pressure-sensitive face directly is in communication with the outside.
As shown in figure 10, when measuring the open-top receptacle liquid level, the detecting head 39 that is positioned at the liquid level below is provided with an absolute pressure sensor and signal processing apparatus thereof, its extension line 40 adopts polyurethane heavy wall cable, display part 43 and upper sensor 42 are installed in the casing, and upper sensor 42 is in communication with the outside by wireway and macromolecular filtering device 41.When tested liquid medium density changes, can adopt structure as shown in figure 11, sensor 44 of sealing and fixing again in detecting head 39, the pressure-sensitive face of this sensor 44 is in communication with the outside by the through hole on detecting head 39 sidewalls.
As shown in figure 12, when measuring closed vessel liquid level, the detecting head 39 that is positioned at the liquid level below is provided with two sensors, wherein the pressure-sensitive face of lower sensor 45 is communicated with measured medium by the through hole on the detecting head 39, and the pressure-sensitive face of upper sensor 44 is communicated with measured medium top gas by the through hole on the detecting head 39.When tested liquid medium density changes, can adopt structure as shown in figure 13, in detecting head 39, be provided with two sensors, the pressure-sensitive face of upper sensor 44 and lower sensor 45 all is communicated with measured medium by the through hole on the detecting head 39.
Below in conjunction with Figure 14 the liquid level emasuring device that uses two sensors is described.Behind the program start of signal processing apparatus, carry out the initialization of system at step S1, the voltage signal of read sensor A1 in step S2, in step S3, the voltage signal of sensors A 1 is changed through A/D, and calculates corresponding pressure values P1 in step S4.Similarly, program can calculate the pressure values P2 that the A2 sensor sensing arrives.In step S8, fluid density value ρ and gravity acceleration value g that P1, P2 that the program basis measures and program preset calculate liquid level h; The total pressure P2 that in step S9, shows measured point under the level value h that calculates and pressure P1 more than the liquid level that measures and the liquid level then.Program loop repeating step S2 is to the process of S9, and with real-time reflection liquid level numerical value, this method is applicable to the situation that liquid medium density is constant, and for closed container and open-top receptacle, this method is suitable equally.
In conjunction with Figure 15 the function of using many sensors to carry out the form of implementation of level gauging is described again.Behind the program start, carry out the initialization of system at step S1, the voltage signal of read sensor A1 in step S2, in step S3, the voltage signal of sensors A 1 is changed through A/D, and calculates corresponding pressure values P1 in step S4.Similarly, program can calculate the A2 sensor sensing to pressure values P2 and the pressure values P3 that arrives of A3 sensor sensing.In step S11, gravity acceleration value that P2, P3 that the program basis measures and program preset and the fixed range h between A2 and the A3
0, calculate the density p of liquid medium; Then in step S12, the density p of the liquid medium that calculates among the applying step S11, in conjunction with pressure values P3 and P1, calculate the vertical range h of liquid level distance A 3 sensors, it is level value, program loop repeating step S2 is to the process of S13, with real-time reflection liquid medium density and liquid level numerical value.This method is applicable to the situation that liquid medium density changes.
The present invention is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present invention; for example adopt as Figure 16; structure shown in 17; upper sensor 42 is arranged on the diverse location place in the casing; and be in communication with the outside by conduit; or as Figure 18; 19; 20; 21; shown in 22; when being sealed, adopts detecting head tail pipe seal with double-cone pad 51 separately; inner seal ring 52 and cone seal plug 53 seal; or opening or passage are set on the housing of detecting head the pressure-sensitive face of lower sensor is connected with extraneous; no matter but on its shape or structure, do any variation, every employing two-wire system; multisensor is measured the fluid level transmitter that pressure values in the liquid medium and liquid level top atmospheric pressure value draw required level value and is all dropped within protection scope of the present invention.
Claims (5)
1, a kind of two-wire system multiple sensors liquid level transmitting instrument is characterized in that, comprising:
Upper sensor is used to measure liquid level top atmospheric pressure value, is absolute pressure sensor;
Lower sensor is used to measure place, measured point total pressure in the liquid medium, is absolute pressure sensor; Described lower sensor connection terminal place has hermetically-sealed construction, and the sealing structure comprises a housing, and lower sensor is fixed in this housing, and its pressure-sensitive face is connected with extraneous, and its lead is drawn the position sealing and fixing; Described housing is a cylindrical shape, comprise lower sensor construction section and the lead section of drawing two parts, the housing two ends are provided with screw thread, the inwall of lower sensor construction section is provided with projection, set nut matches with projection lower sensor is gripped, set nut is provided with the through hole that the pressure-sensitive face that can make lower sensor is in communication with the outside, and can be provided with screen cloth in this through hole, is provided with O-ring seal between lower sensor and housing; The inner chamber of the lead section of drawing be along its axis direction "
" shape, comprise two double cone faces, wherein a side is by inner seal ring and the female compacting sealing of locking wire, and opposite side seals by clamping sleeve extruding tail pipe seal with double-cone pad by last locknut or by last locknut;
Signal processing apparatus is handled the data of upper and lower part sensor measurement;
Upper sensor, lower sensor link to each other with signal processing apparatus.
2, two-wire system multiple sensors liquid level transmitting instrument as claimed in claim 1 is characterized in that,
The tortuous bifurcated of through hole on the set nut of described lower sensor construction section ground is in communication with the outside, and can constitute by the direct straight hole that links to each other with the pressure-sensitive face of lower sensor with the perpendicular right-angled intersection hole of this straight hole.
3, two-wire system multiple sensors liquid level transmitting instrument as claimed in claim 1, it is characterized in that, described signal processing apparatus is arranged in the casing, casing is provided with display and output port, the lead of lower sensor is introduced casing and is connected with the input end of signal processing apparatus, upper sensor is fixed in the casing, and its pressure-sensitive face directly or by pipeline is in communication with the outside; Described upper and lower sensor can be 86 type sensors or 1210 type sensors.
4, two-wire system multiple sensors liquid level transmitting instrument as claimed in claim 1 is characterized in that, measuring process is carried out the initialization of system at the beginning after signal processing apparatus starts;
Read the voltage signal of upper sensor, the voltage signal of upper sensor goes out corresponding pressure values P1 through the A/D conversion Calculation;
Read the voltage signal of lower sensor, the voltage signal of lower sensor goes out corresponding pressure values P2 through the A/D conversion Calculation;
Fluid density value ρ and gravity acceleration value g that pressure values P1, P2 that the program basis measures and program preset calculate liquid level h;
The total pressure P2 that shows measured point under the level value h that calculates and pressure P1 more than the liquid level that measures and the liquid level;
Program loop repeats said process, reflects liquid level numerical value in real time.
5, two-wire system multiple sensors liquid level transmitting instrument as claimed in claim 1 is characterized in that, lower sensor is two, is positioned at differing heights, and measuring process is carried out the initialization of system at the beginning behind the program start of signal processing apparatus;
Read the voltage signal of upper sensor, the voltage signal of upper sensor goes out corresponding pressure values P1 through the A/D conversion Calculation;
Read the voltage signal of lower sensor, its voltage signal goes out corresponding pressure values P2 through the A/D conversion Calculation;
Read the voltage signal of another lower sensor, its voltage signal goes out corresponding pressure values P3 through the A/D conversion Calculation;
Gravity acceleration value that pressure values P2 that the pressure values P1 that the voltage signal of the upper sensor that the program basis measures is changed out, the voltage signal that reaches lower sensor are changed out and program preset and the fixed range h between the lower sensor
0, calculate the density p of liquid medium;
The density p of the liquid medium that the application aforementioned calculation obtains, in conjunction with two other pressure values P2 or P3, the vertical range or the liquid level that promptly obtain liquid level as calculated and apart from pressure values be the sensor of P2 are the vertical range of the sensor of P3 apart from pressure values, i.e. the level value of differing heights;
Program loop repeats said process, reflects liquid medium density and liquid level numerical value in real time.
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| CNB2004101039325A CN1312462C (en) | 2004-12-31 | 2004-12-31 | Two-wire system multiple sensors liquid level transmitting instrument |
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| CNB2004101039325A CN1312462C (en) | 2004-12-31 | 2004-12-31 | Two-wire system multiple sensors liquid level transmitting instrument |
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| CN1312462C true CN1312462C (en) | 2007-04-25 |
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| CN2233564Y (en) * | 1994-11-02 | 1996-08-21 | 承德市热河仪表有限公司 | Two-wire level transducer |
| CN2226282Y (en) * | 1994-12-16 | 1996-05-01 | 烟台市招远自动化仪表厂 | Static pressure liquid level-meter sensor device |
| JPH08271318A (en) * | 1995-03-31 | 1996-10-18 | Yamatake Honeywell Co Ltd | Liquid level measuring device |
| CN2299307Y (en) * | 1997-03-27 | 1998-12-02 | 北京市新大云传感技术公司 | throwing static pressure liquid level transmitter |
| CN2348358Y (en) * | 1998-12-07 | 1999-11-10 | 北京美仪科技开发公司 | Automatic metering device for oil, gas and water |
| CN2758716Y (en) * | 2004-12-31 | 2006-02-15 | 北京塞尔瑟斯仪表科技有限公司 | Active liquid level meter of two-line system multi-sensors |
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| CN1621784A (en) | 2005-06-01 |
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