CN206523204U - Novel capacitance-type sensor liquid level detection system - Google Patents
Novel capacitance-type sensor liquid level detection system Download PDFInfo
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- CN206523204U CN206523204U CN201621258913.4U CN201621258913U CN206523204U CN 206523204 U CN206523204 U CN 206523204U CN 201621258913 U CN201621258913 U CN 201621258913U CN 206523204 U CN206523204 U CN 206523204U
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- 239000007788 liquid Substances 0.000 title claims abstract description 68
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- 230000006870 function Effects 0.000 claims description 2
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
A kind of new capacitance type sensor liquid level detection system, including：The capacitance detection unit of real-time capacitance data detection is carried out to level sensing point, for the control chip unit judged liquid level, the output display unit for providing corresponding fluid level condition signal, the power subsystem for providing power supply for system；The detection signal input part of capacitance detection unit and control chip unit is connected, and the signal output part of output display unit and control chip unit is connected.The utility model is simple in construction, with low cost, anticorrosion and pollution, and measurement accuracy is high.
Description
Technical field
The utility model is related to a kind of system and method for level sensing, more particularly to a kind of novel capacitance-type sensor liquid
Position detecting system.
Background technology
Fixed-point liquid level detection is that the liquid level of several fixed positions is measured, and such as upper and lower limit is indicated, is segmented liquid level
Indicate etc..Level measuring method is a lot, there is capacitance method, electric-resistivity method, magnetostriction method, magnetic turnover panel method, vibratory drilling method, float liquid level
Meter method, laser liquid-level method, optical fiber liquid level method, pressure differential method etc., liquid-level switch method, safety valve method, servo liquidometer method etc..
Differential pressure method is one of method of liquid level in measurement storage tank the most frequently used at present, and this method is only permanent in fluid density
It is fixed it is constant under conditions of just can guarantee that the accuracy of measurement, actual conditions fluid density is liquid components and the polynary letter of temperature
Number, when liquid components and temperature change can cause density to change.
The method of ultrasonic measuring liquid level is relatively more, wherein application is more widely pulse echo method.The biography of ultrasonic wave
Broadcast speed is influenceed by factors such as the density of medium, pressure, temperature, concentration.Supercritical ultrasonics technology level gauging is simple in construction, convenient to install
And safeguard, belong to non-contact measurement, available for poisonous, corrosive gas, the level gauging of high viscosity liquid, but should not use
In bubbles or the liquid of solid particle.
Optical fiber liquid level measurement is particularly suitable for use in inflammable with sensitivity height, fast response time, electromagnetism interference, corrosion-resistant
Explosive adverse circumstances, it is adaptable to the level gauging of plurality of liquid.It has the disadvantage that dirty liquid can not be detected and can sticked to
The liquid level of the thick substances on gauge head surface.
Laser pulse method level gauging is to put on detection signal on the laser of firm power, is useful in oil tank level survey
The inflammable and explosive environment such as amount, with good security, while no-movable part, easy to maintenance, system rejection to disturbance is strong, valency
Lattice are relatively low.Weak point, optical lens vulnerable to pollution influences measurement result.
Radar wave method measurement liquid level can be used for the survey of corrosivity, the liquid level of high viscosity and toxic liquid and solid material level
Amount, measurement apparatus does not have movable member, and no measurement dead area, radar wave propagation speed depends on the relative dielectric constant and magnetic of medium
Conductance, therefore do not influenceed by temperature, pressure etc., belong to non-cpntact measurement, real-time is good.Weak point, price is higher..
The content of the invention
The utility model purpose is, for above the deficiencies in the prior art, and design is a kind of simple in construction, with low cost,
Anticorrosion and pollution, the high non-contact capacitance formula sensor liquid level detection system of measurement accuracy.
The utility model purpose can be achieved through the following technical solutions, a kind of novel capacitance-type sensor level sensing system
System, including：
Capacitance detection unit：At least there is a level sensing that real-time capacitance data detection is carried out to level sensing point
End；
Control chip unit：Environmental capacitance data and real-time electric capacity number for the level sensing end to capacitance detection unit
According to the self-adapting data feedback for carrying out repeated detection, comparing and carrying out environmental change in real time, it follows that current scale liquid position
State, and whether liquid has arrived at demarcated liquid level judgement；
Output display unit：Signal for receiving control chip unit, provides corresponding fluid level condition signal；
Power subsystem：For providing simple interest power supply for system；
The detection signal input part of capacitance detection unit and control chip unit is connected, output display unit and control core
The signal output part of blade unit is connected.
It is provided with described novel capacitance-type sensor liquid level detection system, its capacitance detection unit for detecting sensitive
Spend the sensitivity adjustment electric capacity of adjustment.
Described novel capacitance-type sensor liquid level detection system, its system also includes memory cell, for storing inspection
Survey the detection data of unit and the data of control chip unit.
Described novel capacitance-type sensor liquid level detection system, the level sensing end of its capacitance detection unit is by detection electricity
Pole T and resistance R are composed in series, the detection signal input part of resistance R another termination control chip unit.
Described novel capacitance-type sensor liquid level detection system, its control chip unit is with capacitance detecting function
Controller or single-chip microcomputer.
Described novel capacitance-type sensor liquid level detection system, its output display unit can be display screen, printing set
Standby, light or sound show equipment.
Technology involved by the utility model, belongs to non-cpntact measurement, and detection is known by the situation of capacitance variations
Fluid level condition.The density of liquid body, chemical characteristic etc. do not influence this capacitance variations, are that a kind of safe, inexpensive, practicality is high
Technology of Level Detection.The level gauging of any liquid level with electrolyte can be widely used in, industry, agricultural, daily life all may be used
To use；Nontoxic pollution-free is not also contaminated, safe ready.
Brief description of the drawings：
Fig. 1 is structural principle schematic block diagram of the present utility model；
Fig. 2 is circuit diagram of the present utility model；
Fig. 3 is flow chart of the present utility model.
Specific embodiment：
It is structural principle schematic block diagram of the present utility model as shown in Figure 1 and Figure 2；Including capacitance detection unit 10, control core
Blade unit 11, output display unit 12, data storage cell 13 and power subsystem 14.Wherein data storage cell, is according to not
With controller characteristic in itself and do corresponding adjustment, that is, the controller having contains EEPROM cell in itself, then without plug-in
Extra EEPROM;And if selected controller does not have EEPROM cell in itself, then must plug-in single EEPROM
Chip.
Capacitance detection unit 10 provided with multiple level sensing end T1 that real-time capacitance data detection is carried out to level sensing point,
T2, T3-----Tn, the number of its test side are determined according to level sensing point.Level sensing end T1, T2, T3-----Tn difference
By the detection signal input part SENS1 of resistance R1, R2, R3-----Rn and control chip unit 11, SENS2,
SENS3----- SENSn connect.Detecting electrode T composition, specific method is exactly to be configured to change with liquid level
And the part of capacitance variations is produced, can be copper foil or external metallic conductor on pcb board, or other can be with liquid
Position changes and produced any conductive material of electric capacitance change.General principle is：When no liquid, the reading of electric capacity
Value is stablized and than larger relatively, and when there is liquid to reach detecting electrode respective heights, the capacitive reading value of the electrode is to reduce,
So only need to monitor the change of the capacitive reading of the electrode, you can judge whether liquid level is up to standard, so as to reach that fluid level condition refers to
Show or purpose that liquid level is quantitatively indicated.
Consistent difference during in order to accurately judge that liquid level is up to standard, in system initialization, can be set by adjusting electric capacity C2
Surely the consistent difference △ Tup when liquid level adapted to is up to standard.
During C1 is filter capacitor, the present embodiment in Fig. 2, control chip unit 11 selects model ADATW08IC chips.
For the level sensing end ring border capacitance data of capacitance detection unit 10 and real-time capacitance data are carried out repeated detection, compare,
And the self-adapting data feedback of environmental change is carried out in real time, it follows that the state of current fixed-point liquid level, if liquid has been arrived
Judge up to the liquid level at fixed point.
The input of output display unit 12 connect respectively the signal output part IO1 of control chip unit 11, IO2,
IO3, ----IOn, the signal output part of control chip unit 11 continuously exports the data result of liquid level, can be needed with various
The data mode output wanted.Such as IIC modes, serial mode, Transistor-Transistor Logic level mode etc..
Its output display unit 12, can be the one or more that display screen, printing device, light or sound show equipment.
As shown in figure 3, being flow chart of the present utility model.Step 20 starts in figure, upper electricity, and whole system prepares to open
Dynamic, the system of this controller of step 21 pair is initialized, while finding aneroid reference value A accurately or preparing obtaining for aneroid reference value A
Take.Step 22 is to judge currently whether need environmental correction to act, if desired, step 23 carries out environmental correction, subsequently into step
Rapid 25 formal level sensing link.If environment value need not be corrected, enter 24 and directly obtain aneroid reference value A, this data A
It is extremely important.Step 26 is compared computing to data A and data B, while start the adaptive equalization computing to reference data,
To ensure environmental data with having relatively accurate mathematical relationship before liquid level data.
In A>B and A<When B is compared, checking whether liquid level is in state up to standard, usual software can set liquid level to reach
State flag bit is marked to indicate liquid level state in which, will be by liquid level state up to standard when liquid level Rule of judgment up to standard is met
Mark position 1, otherwise clear 0.Liquid level state up to standard is checked by inquiring about liquid level state flag bit up to standard to realize.
In A<When B is compared, A is substituted with (A+B)/2, as save value, 25 are back to, be to adapt to environment, make the meter of preservation
Numerical value approaching to reality reading at relatively slow speeds, it is acted on mainly distinguishes liquid level and is slowly increased and ring to a certain extent
Border it is slowly varying.
△ Tup are to judge consistent difference when liquid level is up to standard, are set when the difference is by initializing, can be by adjusting electric capacity C2
Software set is adapted to.
△ Tdn are to judge consistent difference when liquid level is not up to standard, are set when the difference is by initializing, can be by adjusting electric capacity
C2 is adapted to software set.
△ Tadp are the consistent difference for determining whether to adapt to environmental change, set, can pass through when the difference is by initializing
Electric capacity C2 is adjusted to adapt to software set.
In the continuous occurrence number of this count status of program whether more than 50 times（This detection number of times can be according to practical application need
Increased or decreased）In, if all determining (A-B) for continuous 50 times more than adaptive consistent difference, it is less than again and judges liquid
Position consistent difference up to standard, then be regarded as external environment (environmental factor such as temperature, humidity) and there occurs that change causes possibility
Property is than larger, just by the slow approaching to reality environment value of the count value of preservation.
Claims (6)
1. a kind of novel capacitance-type sensor liquid level detection system, it is characterised in that the technology includes：
Capacitance detection unit：At least one carries out the level sensing end of real-time capacitance data detection to level sensing point；
Control chip unit：For to the level sensing end ring border capacitance data of capacitance detection unit and the progress of real-time capacitance data
Repeated detection, the self-adapting data feedback for comparing and carrying out environmental change in real time, it follows that the state of current fixed-point liquid level,
Whether the liquid level that liquid is had arrived at fixed point judges；
Output display unit：Signal for receiving control chip unit, provides corresponding fluid level condition signal；
Power subsystem：For providing simple interest power supply for system；
The detection signal input part of capacitance detection unit and control chip unit is connected, output display unit and control chip list
The signal output part of member is connected.
2. novel capacitance-type sensor liquid level detection system according to claim 1, it is characterised in that the capacitance detecting
The sensitivity adjustment electric capacity adjusted for detection sensitivity is provided with unit.
3. novel capacitance-type sensor liquid level detection system according to claim 1 or 2, it is characterised in that the system
Also include memory cell, for storing the detection data of detection unit and the data of control chip unit.
4. novel capacitance-type sensor liquid level detection system according to claim 1 or 2, it is characterised in that the electric capacity
The level sensing end of detection unit is composed in series by detecting electrode T and resistance R, resistance R another termination control chip unit
Detect signal input part.
5. novel capacitance-type sensor liquid level detection system according to claim 1 or 2, it is characterised in that the control
Chip unit is controller or single-chip microcomputer with capacitance detecting function.
6. novel capacitance-type sensor liquid level detection system according to claim 1 or 2, it is characterised in that the output
Display unit can be that display screen, printing device, light or sound show equipment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621258913.4U CN206523204U (en) | 2016-11-23 | 2016-11-23 | Novel capacitance-type sensor liquid level detection system |
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| CN201621258913.4U CN206523204U (en) | 2016-11-23 | 2016-11-23 | Novel capacitance-type sensor liquid level detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106352948A (en) * | 2016-11-23 | 2017-01-25 | 深圳市阿达电子有限公司 | Novel capacitive-sensor liquid level detection system and method |
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- 2016-11-23 CN CN201621258913.4U patent/CN206523204U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106352948A (en) * | 2016-11-23 | 2017-01-25 | 深圳市阿达电子有限公司 | Novel capacitive-sensor liquid level detection system and method |
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Granted publication date: 20170926 Termination date: 20191123 |