CN106092271A - A kind of laser liquid-level measurement apparatus and method - Google Patents
A kind of laser liquid-level measurement apparatus and method Download PDFInfo
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- CN106092271A CN106092271A CN201610638052.0A CN201610638052A CN106092271A CN 106092271 A CN106092271 A CN 106092271A CN 201610638052 A CN201610638052 A CN 201610638052A CN 106092271 A CN106092271 A CN 106092271A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
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- Level Indicators Using A Float (AREA)
Abstract
The invention discloses a kind of laser liquid-level measurement apparatus, the conduit of float it is provided with including inside, the bottom of conduit is provided with filtration, conduit is connected with outside liquid by filtration, the top of conduit connects hermetic electronics storehouse, being provided with laser instrument in electronics storehouse, the sidewall that electronics storehouse is connected with conduit is provided with translucent construction；Float is provided with reflecting surface near the side of laser instrument, and float is provided with counterweight away from the side of laser instrument, and the Laser emission end of laser instrument and reflected signal receiving terminal are all arranged towards reflecting surface；The laser signal that laser instrument is launched arrives reflecting surface through translucent construction, and the reflected signal of reflecting surface returns to laser instrument through translucent construction.In laser instrument is arranged on Full-enclosed electronic storehouse in the present embodiment, work site environments is adapted to ability and is greatly improved.
Description
Technical field
The invention belongs to fields of measurement, be specifically related to a kind of laser liquid-level measurement apparatus, particularly relate to storage tank, water conservancy water
The superelevation Level Detection fields such as electricity, chemical industry, petroleum pipeline, urban sewage, city water supply and sewage.
Background technology
Existing level gauging mainly includes liquid level measurement, water conservancy and hydropower level gauging and municipal drainage, drainage
Level gauging etc..Tank level combines it and stores fluid density, calculates liquid storage volume and quality.Tank level index is modern
One of important indicator that chemical industry produces.Water conservancy and hydropower is mainly used in river, lake, seashore, reservoir, ship lock, sump etc.
Many-sided water level detecting, the index of accurate water level plays the important works such as economical operation, safe operation, able to resisting flood and drought, scientific dispatch
With.Sewerage system is to process and get rid of municipal sewage and the job facilities system of rainwater hydrops, is urban public utilities
Ingredient.Sewerage system planning is the ingredient of overall city planning.Carrying out sewage, the situation of rainwater separate system
Under, sewage, rainwater level measuring play the effect of rational management drainage pumping plant and emptying gate, and sewage is collected by drainage pipeline,
After delivering to sewage farm process, enter water body or recycling；After rainfall runoff is collected by drainage pipeline, enter water nearby
Body.
The measurement means in level gauging field mainly includes throw-in type technology, ultrasonic technology, magnetostrictive technology at present
With float-type technology.
Wherein the throw-in type liquid level sensor of throw-in type technology is to become ratio based on surveyed fluid pressure with the height of this liquid
The principle of example, uses isolated form diffusion silicon-sensitive element or ceramic capacitive pressure sensitive sensor, static pressure is converted to the signal of telecommunication,
Again through temperature-compensating and linear correction, change into standard electric signal.View such as Fig. 1 is installed in application, and it includes throw-in type liquid
Three kinds of application forms of level sensor, the left side is deep-well, tank, and centre is reservoir, rivers, lake, and the right is fluid reservoir, pipeline.
They can represent current most of pressure liquid level sensor installation form.Including pressure liquid level sensor probe, even
Connect cable, fixed installation plane and transmitter.Throw-in type liquid level sensor workflow: sensor probe gathers liquid-level pressure and leads to
Cross cable power supply, be transferred to transmitter, transmitter pressure physical quantity pick-up is become the signal of telecommunication (generally 4～20mA/DC1～
5V), read for PLC, capture card.
The ultrasonic liquid level sensor of ultrasonic technology is the sensor utilizing the characteristic of ultrasound wave to develop.Ultrasound wave
It is a kind of frequency of vibration mechanical wave higher than sound wave, transducing wafer occurs vibration to produce under the excitation of voltage.Ultrasound wave
Encounter impurity or separating surface can produce reflection echo, encounter live animal physical ability and produce Doppler effect.Therefore ultrasound examination is wide
General apply at aspects such as industry, national defence, biomedicines.View such as Fig. 2 is installed in application, and it includes ultrasonic liquid level sensor three
Planting application form, the left side is deep-well, tank, and centre is reservoir, rivers, lake, and the right is fluid reservoir, pipeline.They can generation
Most of supersonic liquid level application installation forms before entry.Ultrasonic sensor operation principle: by ultrasonic transducer (probe)
Sending high-frequency impulse sound wave, run into testee (material) surface and turned back by reflection, reflection echo is received by transducer and is converted into
The signal of telecommunication, the propagation time of sound wave is directly proportional to the distance of body surface twice to transducer.
The magnetostrictive liquid level sensor of magnetostrictive technology is the Absolute position measurement using magnetostriction principle to manufacture
Sensor.This product is made up of impulse circuit, waveguide wire, echo-signal unit, structural member and protection sleeve pipe.Owing to using non-connecing
Touch metering system, thus be widely used in petrochemical industry, food, water process, environmental protection, pesticide, papermaking, reservoir, dyestuff, oil pressure
In the industry device such as machinery.View such as Fig. 3 is installed in application, and it includes three kinds of types of service of magnetostrictive liquid level sensor, left
While be deep-well, tank, centre is reservoir, rivers, lake, and the right is fluid reservoir, pipeline.It is super that they can represent great majority at present
Sound wave liquid level application installation form.Including float, measuring staff, fixed pan and electronics storehouse.Magnetostrictive liquid level sensor work
Make principle: in electronics storehouse, pulse generator produces initial pulse along waveguide wire propagation, when running into the float being embedded with magnet ring, generation
Magnetostrictive effect echo passback list storehouse.Owing to impulse wave has fixing transmission velocity of wave in waveguide filament, initiate ripple and return
Ripple transmission time difference is proportional to the twice in electronics storehouse and the spacing of float, by calculating, can accurately measure liquid level.
The float type liquid level sensor of float-type technology is the Absolute position measurement sensing using gravitational equilibrium principle to manufacture
Device.This product is made up of float, counterweight, steel cable, rotary encoder.Metering system owing to using is simple, directly perceived, so at water
In profit, Application comparison is extensive.
View such as Fig. 4 is installed in application, and it includes three kinds of types of service of float type liquid level sensor, and the left side is deep-well, water
Groove, centre is reservoir, rivers, lake, and the right is fluid reservoir, pipeline.They can represent current most of supersonic liquid levels and pass
Sensor application installation form.Including float, steel cable, fixed pan, rotary encoder and counterweight.When liquid level changes, floating
Son makees fluctuation linear motion, passes to rotary encoder by steel cable, forms the rotary motion of rotary encoder, rotary encoder
Value taken out by capture card or PLC to calculate current level value.
Current liquid level emasuring device on the market is exactly mainly above four kinds.They use on all deposit respective defect and
Problem, the performance parameter of concrete each side is as shown in table 1.
| Type | Blind area | Maximum level | Environmental effect | Accuracy of detection | Reliability | Manufacturing process |
| Ultrasound wave | 0.5-1.2m | 70m | Impact is big | ±3mm | Typically | Simply |
| Throw-in type | 0.5m | 100m | Typically | ±5mm | Typically | Simply |
| Float-type | 0.1m | 40m | Impact is big | ±10mm | Difference | Simply |
| Magnetostriction | 0.05m | 25m | Typically | ±1mm | High | Complicated |
Table 1
Summary of the invention:
It is an object of the invention to provide a kind of laser liquid-level measurement apparatus, it is possible to, ask present in background technology to overcome
Topic.
To achieve these goals, the technical scheme is that
A kind of laser liquid-level measurement apparatus, is provided with the conduit of float including inside, it is characterised in that: the bottom of conduit is provided with
Filtration, conduit is connected with outside liquid by filtration, and the top of conduit connects hermetic electronics storehouse, electronics storehouse
Inside being provided with laser instrument, the sidewall that electronics storehouse is connected with conduit is provided with translucent construction；
Float is provided with reflecting surface near the side of laser instrument, and float is provided with counterweight, laser instrument away from the side of laser instrument
Laser emission end and reflected signal receiving terminal all towards reflecting surface arrange；
The laser signal that laser instrument is launched arrives reflecting surface through translucent construction, and the reflected signal of reflecting surface is tied through printing opacity
Structure returns to laser instrument.
It is preferred that also include the location and installation part for fixation measuring device.
It is preferred that by Flange joint between conduit and electronics storehouse, location and installation part is arranged on flange.
It is preferred that filtration is filter chamber.
It is preferred that be uniformly laid with several filter opening on each sidewall of filter chamber.
It is preferred that be matched in clearance between the outer circumference surface of float and the inwall of conduit, the outer rim of reflecting surface and conduit
It it is matched in clearance between inwall.
It is preferred that the power line of laser instrument is connected with external power source by the waterproof plug connector being arranged on electronics storehouse
Connecing, conduit and filtration are the conduit made of stainless steel material and filtration.
It is preferred that the power line signal transmission line of laser instrument by the waterproof plug connector that is arranged on electronics storehouse with outer
Portion's controller connects.
It is preferred that electronics storehouse is coated with temperature insulating material.
The laser liquid-level measuring method that a kind of above-mentioned device is carried out:
Measurement apparatus is arranged on sidewall or the end face in region to be measured by the location and installation part being arranged on flange；
Liquid enters conduit, buoys float liquid upper surface in the catheter by filtration, counterweight keep floating
The balance of son；
The laser signal that laser instrument is launched arrives reflecting surface through translucent construction, and the reflected signal of reflecting surface is tied through printing opacity
Structure returns to laser instrument；
Laser instrument draws liquid level data by launching laser and reception reflected signal；
Liquid level data is sent to peripheral control unit by laser instrument by liquid level data by wired or wireless signal.
The beneficial effects of the present invention is: the location and installation part being arranged on mounting flange in use, is connected by the present invention
Receiving on the sidewall of deep-well or river reservoir, or be connected to top or the sidewall of fluid reservoir, after connecting, this device is the most fixed
Position installation, can start working.Filtration namely the filter chamber with collision prevention function filter liquid impurity, and connection is outside
Liquid level, liquid is entered conduit by filter chamber, makes catheter interior buoys float, should protect according to the liquid level in each container of Ju law of connected vessels
Holding equal, float and fluid level keep opposing parallel, and laser is to the reflecting surface of lower section buoy top, and receives float and reflected
The laser official's art come, accurately measures float position, then is transferred to controller with wired or wireless form, to reach Level Detection
Purpose, maximum level is up to 200m.In in the present embodiment, laser instrument is arranged on Full-enclosed electronic storehouse, and outside hermetic electronics storehouse
It is coated with again temperature insulating material, is greatly improved so work site environments is adapted to ability.Owing to having installed additional, there is crashworthiness
Filtration so that this device all can normally work under the various water body environments such as husky mud, sewage, floating thing.This device uses
Main body uses all steel structure, has waterproof and dustproof, the feature such as damp proof, shockproof, the change of environment on measuring not impact,
While the present invention improves measurement operational reliability again, it is substantially reduced the cost that device makes and measures operation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that existing throw-in type liquid level sensor uses in deep-well, river reservoir and fluid reservoir；
Fig. 2 is the schematic diagram that existing ultrasonic liquid level sensor uses in deep-well, river reservoir and fluid reservoir；
Fig. 3 is the schematic diagram that existing Liquid Level Sensor Based on Magnetostriction uses in deep-well, river reservoir and fluid reservoir；
Fig. 4 is the schematic diagram that existing float type liquid level sensor uses in deep-well, river reservoir and fluid reservoir；
Fig. 5 is the structural representation of laser liquid-level measurement apparatus described in the embodiment of the present invention；
Fig. 6 is the use schematic diagram in deep-well of the laser liquid-level measurement apparatus described in the embodiment of the present invention；
Fig. 7 is the use schematic diagram in river reservoir of the laser liquid-level measurement apparatus described in the embodiment of the present invention；
Fig. 8 is the use schematic diagram in fluid reservoir of the laser liquid-level measurement apparatus described in the embodiment of the present invention；
Fig. 9 is the enlarged drawing in the embodiment of the present invention at float and tubes fit；
Figure 10 is the schematic diagram of cross section at float and tubes fit in the embodiment of the present invention；
Figure 11 is the side structure schematic diagram of embodiment of the present invention flange.
In figure: 1-filtration, 2-float, 3-fluid level, 4-flange, 5-laser instrument, 6-reflecting surface, 7-conduit, 8-
Support bar, 9-connecting rod, 10-electronics storehouse, 11-counterweight, 12-waterproof plug connector.
Detailed description of the invention
The present invention is described further with embodiment below in conjunction with the accompanying drawings.
Embodiment one
A kind of laser liquid-level measurement apparatus, is provided with the conduit 7 of float 2 including inside, and the bottom of conduit 7 is provided with filtration
1, the filtration 1 of the present embodiment is filter chamber, and filter chamber is the cylinder that diameter is identical with conduit 7, each of filter chamber
Uniformly being laid with several filter opening on sidewall, a diameter of 10mm of each filter opening, the distance between each filter opening outer rim is also
10mm；Filtration 1 namely filter chamber are passed through in the bottom of conduit 7, and the fluid connection in outside region to be measured,
The top of conduit 7 connects hermetic electronics storehouse 10, is provided with laser instrument 5, the power supply of laser instrument 5 in electronics storehouse 10
Line and holding wire are all connected with external power source and peripheral control unit by the waterproof plug connector 12 being arranged on electronics storehouse 10.
Laser instrument 5 can also be connected with peripheral control unit by wireless signal.Peripheral control unit is PLC.
It is matched in clearance between outer circumference surface and the inwall of conduit 7 of float 2, the outer rim of reflecting surface 6 and the inwall of conduit 7
Between be matched in clearance.
Float 2 is provided with reflecting surface 6 near the side of laser instrument 5, and float 2 is provided with counterweight 11 away from the side of laser instrument 5,
Reflecting surface 6 is connected to the top of float 2 by support bar 8, and counterweight 11 is arranged at the bottom of float 2 by connecting rod 9, makes to float
Son 2 keeps balance when floating, and liquid level is maintained at float 2 middle part；The Laser emission end of laser instrument 5 and reflected signal receive
End is all arranged towards reflecting surface 6.
The sidewall that electronics storehouse 10 is connected with conduit 7 is provided with translucent construction, and the laser signal that laser instrument 5 is launched is tied through printing opacity
Structure arrives reflecting surface 6, and the reflected signal of reflecting surface 6 returns to laser instrument 5 through translucent construction.
The present embodiment also includes the location and installation part for fixation measuring device, passes through method between conduit 7 and electronics storehouse 10
Blue 4 connect, and location and installation part is arranged on flange 4.
Conduit 7 that conduit 7 and filtration 1 are made for stainless steel material and filtration 1.
Electronics storehouse 10 is also wrapped on temperature insulating material, can preferably improve the operating temperature subject range of laser instrument.
Laser instrument 5 is laser range finder.
The present embodiment goes for the operation of multiple environment, as shown in Figs. 5 to 7, is respectively and is applicable to by the present embodiment
Deep-well, river reservoir, the embodiment of three kinds of environment of fluid reservoir, that they include most industry scene application peace mode.
Embodiment two
A kind of laser liquid-level measuring method utilizing said apparatus to carry out:
Measurement apparatus is arranged on sidewall or the end face in region to be measured by the location and installation part being arranged on flange 4；
Liquid enters conduit by filtration 1, and float 2 swims in the liquid upper surface in conduit 7, counterweight 11 protect
Hold the balance of float；
The laser signal that laser instrument 5 is launched arrives reflecting surface 6 through translucent construction, and the reflected signal of reflecting surface 6 is through thoroughly
Photo structure returns to laser instrument 5；
Laser instrument 5 is automatically by launching laser and receiving the time generation liquid level data of reflected signal；
Liquid level data is sent to peripheral control unit by laser instrument 5 by liquid level data by wired or wireless signal.
Concrete operational approach includes: first the location and installation part being arranged on mounting flange 4 is connected to deep-well or river
On the sidewall of River Reservoir, or being connected to top or the sidewall of fluid reservoir, after connecting, this device i.e. location and installation completes,
Can start working.Filtration 1 namely the filter chamber with collision prevention function filter liquid impurity, the outside liquid level of connection, liquid
Entered conduit 7 by filter chamber, make the internal float 2 of conduit 7 floating, phase should be kept according to the liquid level in each container of Ju law of connected vessels
Flat, float 2 keeps opposing parallel with fluid level 3, and electronics storehouse 10 inner laser device 5 sends 620-690nm with the 150mS clock cycle
Red color visible laser is to the reflecting surface 6 at lower section float 2 top, and receives laser official's art that float 2 reflects back, and accurately measures floating
Son 2 positions, laser instrument 5 is transformed into liquid level data amount by internal MCU, because the distance of measurement apparatus ground and liquid bottom is
Knowing, after obtaining the displacement data of float, can draw liquid level data, liquid level data is transferred to control with wired or wireless form
Device processed, including PLC or capture card, to reach the purpose of Level Detection.
In laser measuring unit is arranged on Full-enclosed electronic storehouse 10 in the present embodiment, work site environments is adapted to ability big
Big raising.Owing to having installed the filtration 1 with crashworthiness additional so that this device is at various water such as husky mud, sewage, floating things
All can normally work under body environment.This device uses main body to use all steel structure, has waterproof and dustproof, damp proof, shockproof etc.
Feature.The change of environment is on measuring not impact.
The present embodiment utilizes the laser distance measuring principle of laser instrument 5 to measure liquid level, and range reaches as high as 200m.In laser instrument 5
Portion uses constant temperature technology, and-10 DEG C to+80 DEG C temperature normally work.Response time≤150mS.Resolution height 1mm precision ± 2mm.
Use the digital liquid level way of output, support RS485, SSI, 4-20mA.High-low limit signal able to programme exports, it is adaptable to automatically
Liquid level circulation regulation.
Device working power described in the present embodiment: DC24V, operating current: ambient temperature < when 30 DEG C≤and 100mA, environment temperature
Degree > 30 DEG C time≤1.2A, environmental condition: temperature :-10 DEG C～+80 DEG C of humidity :≤90%, insulation resistance: >=20M Ω.
The each side parameter of laser type liquid level emasuring device of the present invention and method and existing four kinds of metering systems to such as
Shown in table 2
| Type | Blind area | Maximum level | Environmental effect | Accuracy of detection | Reliability | Manufacturing process |
| Ultrasound wave | 0.5-1.2m | 70m | Impact is big | ±3mm | Typically | Simply |
| Throw-in type | 0.5m | 100m | Typically | ±5mm | Typically | Simply |
| Float-type | 0.1m | 40m | Impact is big | ±10mm | Difference | Simply |
| Magnetostriction | 0.05m | 25m | Typically | ±1mm | High | Complicated |
| Laser type | 0.05m | 200m | Without impact | ±1.5mm | The highest | Simply |
Table 2
The existing four kinds of metering systems in edition with parallel text field, the present invention measures the performance on blind area again and is better than existing ultrasound wave
The metering system of formula, throw-in type and float-type, and identical with the measurement blind area scope of existing magnetostriction type；In certainty of measurement
The accuracy of detection of the aspect present invention is higher than existing ultrasonic type, throw-in type and float-type, and its accuracy of detection compares magnetostriction type
Measuring method is slightly lower；
And the present invention is significantly better than other several metering systems including that magnetostriction type measures scope in maximum level；
Existing several metering system all can by environmental effect, and this environment on assembly of the invention and measure operation all without affect,
The reliability of invention is better than existing various metering system, and the manufacturing process of the present invention is simple, and its cost is than complicated magnetostriction
Formula metering system at least can reduce half.In the case of sacrificing 0.5mm accuracy of detection, many improvement can be exchanged for,
Including improve maximum level, device itself and measure the most unaffected environment of operation, improve reliability and be substantially reduced production with
Measure cost.And within these are also included within the goal of the invention of the present invention.
The operation principle of the present invention can be divided into the combination of three principles, is also referred to as A Ji including law of connected vessels, law of buoyancy
Mead law and laser ranging system application.
The container that the several bottom of law of connected vessels interconnects, injects same liquid, the linker when liquid does not flows
The liquid level of interior each container always remains in same level.
Law of buoyancy is also referred to as Archimedes' principle: object is equal to the weight of arranged liquid at buoyancy suffered by liquid.Floating
Weight=object that power=object is alleviated in a liquid weight-object weight in a liquid in atmosphere.Obviously, object is worked as
During floating, buoyancy is more than the gravity of object, and when object is floating, buoyancy is equal to gravity；But it is when object is in sinking state, floating
Power is less than gravity.The float 2 used in the present invention operates in floating or suspended state.
Laser ranging system is mature technology now, and the application of novel large scale integrated circuit makes long distance and high precision laser
Diastimeter is achieved.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted,
And all these modifications and variations all should belong to the protection domain of claims of the present invention.This specification is retouched in detail
That states partly belongs to prior art known to professional and technical personnel in the field.
Claims (10)
1. a laser liquid-level measurement apparatus, is provided with the conduit (7) of float (2) including inside, it is characterised in that: described conduit
(7) bottom is provided with filtration (1), and described conduit (7) is connected with outside liquid by described filtration (1), described in lead
The top of pipe (7) connects hermetic electronics storehouse (10), is provided with laser instrument (5), described electronics storehouse in described electronics storehouse (10)
(10) sidewall being connected with described conduit (7) is provided with translucent construction；
Described float (2) is provided with reflecting surface (6) near the side of described laser instrument (5), and described float (2) is away from described laser instrument
(5) side is provided with counterweight (11), and the Laser emission end of described laser instrument (5) and reflected signal receiving terminal are all towards described reflection
Face (6) is arranged；
The laser signal that described laser instrument (5) is launched arrives described reflecting surface (6), described reflecting surface through described translucent construction
(6) reflected signal returns to described laser instrument (5) through described translucent construction.
A kind of laser liquid-level measurement apparatus the most according to claim 1, it is characterised in that: also include for fixing described survey
The location and installation part of amount device.
A kind of laser liquid-level measurement apparatus the most according to claim 2, it is characterised in that: described conduit (7) and described electricity
Being connected by flange (4) between sub-storehouse (10), described location and installation part is arranged on described flange (4).
A kind of laser liquid-level measurement apparatus the most according to claim 3, it is characterised in that: described filtration (1) was
Filter chamber.
A kind of laser liquid-level measurement apparatus the most according to claim 4, it is characterised in that: each sidewall of described filter chamber
On be uniformly laid with several filter opening.
A kind of laser liquid-level measurement apparatus the most according to claim 5, it is characterised in that: the excircle of described float (2)
Be matched in clearance between the inwall of face and described conduit (7), the inwall of the outer rim of described reflecting surface (6) and described conduit (7) it
Between be matched in clearance.
A kind of laser liquid-level measurement apparatus the most according to claim 6, it is characterised in that: the power supply of described laser instrument (5)
Line is connected with external power source by the waterproof plug connector (12) being arranged on electronics storehouse (10), described conduit (7) and described
Filtration (1) is the described conduit (7) made of stainless steel material and described filtration (1).
A kind of laser liquid-level measurement apparatus the most according to claim 7, it is characterised in that: the power supply of described laser instrument (5)
Line signal transmssion line is connected with peripheral control unit by the waterproof plug connector (12) being arranged on electronics storehouse (10).
9. according to a kind of laser liquid-level measurement apparatus described in any one of claim 1-8, it is characterised in that: described electronics Cang Bao
It is covered with temperature insulating material.
10. one kind utilizes the laser liquid-level measuring method that the device as described in claim 1-9 is carried out, it is characterised in that
Described measurement apparatus is arranged on sidewall or the top in region to be measured by the location and installation part being arranged on described flange (4)
Face；
Liquid enters described conduit by described filtration (1), and described float (2) swims in the liquid in described conduit (7)
Upper surface, is kept the balance of described float by described counterweight (11)；
The laser signal that described laser instrument (5) is launched arrives described reflecting surface (6), described reflecting surface through described translucent construction
(6) reflected signal returns to described laser instrument (5) through described translucent construction；
Described laser instrument (5) draws liquid level data by launching laser and reception reflected signal；
Described liquid level data is sent to external control by described laser instrument (5) by described liquid level data by wired or wireless signal
Device.
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Application publication date: 20161109 |