CN206281549U - Electrode liquid level detection circuit and for blood purification liquid level detection system - Google Patents
Electrode liquid level detection circuit and for blood purification liquid level detection system Download PDFInfo
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- CN206281549U CN206281549U CN201621389939.2U CN201621389939U CN206281549U CN 206281549 U CN206281549 U CN 206281549U CN 201621389939 U CN201621389939 U CN 201621389939U CN 206281549 U CN206281549 U CN 206281549U
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Abstract
The utility model discloses a kind of electrode liquid level detection circuit, the liquid level detection circuit includes electrode, signal generating circuit and controller, and electrode includes first electrode and second electrode；First electrode is connected with the first input end of signal generating circuit, second electrode is connected with the second input of signal generating circuit, the output end of signal generating circuit is connected with the signal input part of controller, resistance or electric capacity between first electrode and second electrode can change with liquid and be transferred to signal generating circuit, and signal generating circuit exports corresponding waveform signal.Only two electrodes that the utility model is contacted with liquid, simple structure, and the signal for passing through electrode is AC signal, is difficult to produce electrolysis to liquid and electrode, while the high temperature high pressure liquid that it also avoid in blood purification tank causes to damage to detection circuit.Meanwhile, the utility model also solves traditional electrode level sensing and can not detect the shortcoming of reverse osmosis water liquid level, the applicable all of liquid detecting of blood cleaning equipment.
Description
Technical field
The utility model is related to a kind of blood purification Technology of Level Detection field, more particularly to a kind of electrode level sensing
Circuit and for blood purification liquid level detection system.
Background technology
In the water circuit system of blood cleaning equipment, this is controlled to be required for detecting the sensor of liquid level in water inlet and degasification,
Control water inlet or degasification magnetic valve to open by the position signalling of sensor feedback, realize the function of water inlet and degasification.It is existing
Blood purification system water level monitoring mainly have two ways, a kind of is by the way of float switch, as shown in figure 1, ball float 1
It is enclosed within a hollow bar, the inside of ball float 1 is equipped with magnetic material, and bar inside is equipped with the Hall element or tongue tube to magnetic induction
2, ball float 1 is moved up and down to relevant position with liquid level, and, with regard to output signal, system can just be detected accordingly for Hall element or tongue tube
Position.Because all parts of this sensor are all immersed in liquid, heating disinfection, liquid are frequently necessary to inside blood cleaning equipment
Temperature may be up to more than 90 DEG C, in fact it could happen that high temperature causes magnetic material demagnetization, cause Hall element or tongue tube to feel
Signal should be arrived, meanwhile, tank interior there may be larger pressure, if ball float or bar are poorly sealed, liquid may enter inside,
Cause magnetic material, Hall element or tongue tube to damage, cause sensor fault.Another kind be using electrode monitoring by the way of,
As shown in Fig. 2 two electrodes are connected with signal generating circuit and signal receiving circuit respectively, signal generating circuit produces exchange letter
Number, when electrode is immersed in conducting liquid, signal can be sent to signal receiving circuit by electrode and conducting liquid, work as liquid level
Drop to during not in contact with electrode, infinite between two electrodes, signal receiving circuit does not just receive signal.And blood is net
Liquid when entering water management and cleaning of change equipment is the very low reverse osmosis water of electrical conductivity, and equivalent resistance is very big, so signal attenuation
Very big, signal receiving circuit does not just receive signal substantially yet.So traditional electrode level sensing can not apply net in blood
Change equipment enters the places such as water management.
Utility model content
The utility model is intended at least solve technical problem present in prior art, especially innovatively proposes electrode solution
Detect circuit and for blood purification liquid level detection system in position.
In order to realize above-mentioned purpose of the present utility model, the utility model provides a kind of electrode liquid level detection circuit, should
Electrode liquid level detection circuit includes electrode, signal generating circuit and controller, and the electrode includes first electrode and second electrode；
First electrode is connected with the first input end of signal generating circuit, the second input phase of second electrode and signal generating circuit
Even, the output end of signal generating circuit is connected with the signal input part of controller, between the first electrode and second electrode
Resistance or electric capacity can change with liquid and be transferred to signal generating circuit, and the signal generating circuit exports corresponding ripple
Shape signal.
Produced by signal generating circuit and vibrated, output waveform signals, solving traditional electrode level sensing can not detect
The shortcoming of reverse osmosis water liquid.
In a kind of preferred embodiment of the present utility model, the signal generating circuit includes the first amplifier, first
The normal phase input end of amplifier is connected with one end of first resistor and one end of 3rd resistor respectively, the first amplifier it is anti-phase defeated
Enter end to be connected with one end of second resistance and one end of the first electric capacity respectively；The other end of first resistor is connected to the ground, the second electricity
The output end of the other end of resistance and the other end of 3rd resistor respectively with the first amplifier is connected.
Party's wave generator circuit circuit connection structure is simple, and reaction speed is fast.
In a kind of preferred embodiment of the present utility model, also including signal filter circuit, the signal filter circuit
Input be connected with the output end of signal generating circuit, the output end of signal filter circuit and the signal input part phase of controller
Even；The signal filter circuit includes the second electric capacity, the 3rd electric capacity, the 4th resistance and the 5th resistance, one end point of the second electric capacity
Be not connected with one end of the 4th resistance and one end of the 5th resistance, the other end of the 4th resistance respectively with one end of the 3rd electric capacity and
Ground is connected, and the other end of the 3rd electric capacity is connected with the other end of the 5th resistance.
Allow the frequency signal in certain interval range to pass through, be conducive to signal more to stablize.
In a kind of preferred embodiment of the present utility model, also including signaling conversion circuit, the signaling conversion circuit
Input be connected with the output end of signal generating circuit, the output end of signaling conversion circuit and the signal input part phase of controller
Even；The signaling conversion circuit includes the first diode, and the positive pole of the first diode is connected with the output end of signal generating circuit,
The negative pole of the first diode is connected with the signal input part of controller.
The signal of input is converted into the signal of forward direction, the signal of negative sense is filtered, is conducive to subsequent conditioning circuit to process.
In a kind of more preferred implementation method of the present utility model, also including the 4th electric capacity and the 6th resistance, the 4th electricity
Negative pole of the one end of one end of appearance and the 6th resistance respectively with the first diode is connected, the other end and the 6th resistance of the 4th electric capacity
The other end be connected to the ground respectively.
In a kind of preferred embodiment of the present utility model, also including signal comparator circuit, the signal comparator circuit
Input be connected with the output end of signal generating circuit, the output end of signal comparator circuit and the signal input part phase of controller
Even；The signal comparator circuit includes the second amplifier, the inverting input of the second amplifier respectively with one end of the 7th resistance
One end with the 8th resistance is connected, and the other end of the 7th resistance is connected with power supply, and the other end of the 8th resistance is connected to the ground.
Input signal compares size with the basic point signal of setting, exports a low and high level signal.
In a kind of preferred embodiment of the present utility model, also including the 5th electric capacity, one end and the ground phase of the 5th electric capacity
Even, the other end of the 5th electric capacity is connected with the signal input part of controller.
Leach interference of other signals to input signal.
In a kind of preferred embodiment of the present utility model, electrode is constituted using conductive material.
In a kind of preferred embodiment of the present utility model, electrode is stainless steel or graphite.
The electrode of the material is easy to obtain, cheap.
The utility model additionally provides a kind of blood purification liquid level detection system of electrode liquid level detection circuit, by the first electricity
Pole and second electrode are arranged in the blood purification tank in blood purification system.
In sum, by adopting the above-described technical solution, the beneficial effects of the utility model are：The utility model and liquid
Only two electrodes of body contact, simple structure, and the signal for passing through electrode is AC signal, and liquid and electrode will not be produced
Electrolysis, while it also avoid the damage that the high temperature high pressure liquid in blood purification tank is caused to detection.Meanwhile, the utility model
Solving traditional electrode level sensing can not detect the shortcoming of reverse osmosis water liquid, the applicable all of liquid inspection of blood cleaning equipment
Survey.
Brief description of the drawings
Fig. 1 is the structural representation of prior art.
Fig. 2 is the schematic diagram of prior art.
Fig. 3 is schematic block circuit diagram of the present utility model.
Fig. 4 is circuit connection diagram of the present utility model.
Specific embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein ad initio
Same or similar element or element with same or like function are represented to same or similar label eventually.Below by ginseng
The embodiment for examining Description of Drawings is exemplary, is only used for explaining the utility model, and it is not intended that to of the present utility model
Limitation.
In description of the present utility model, it is to be understood that term " longitudinal direction ", " transverse direction ", " on ", D score, " preceding ",
" afterwards ", the orientation or position relationship of the instruction such as "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward " are based on attached
The shown orientation of figure or position relationship, are for only for ease of and describe the utility model and simplify to describe, rather than instruction or hint
Signified device or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this
The limitation of utility model.
In description of the present utility model, unless otherwise prescribed with restriction, it is necessary to explanation, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be mechanically connecting or electrical connection, or two companies of element internal
It is logical, can be joined directly together, it is also possible to be indirectly connected to by intermediary, for the ordinary skill in the art, can
To understand the concrete meaning of above-mentioned term as the case may be.
The utility model provides a kind of electrode liquid level detection circuit, as shown in figure 3, the electrode liquid level detection circuit includes
Electrode, signal generating circuit and controller, electrode include first electrode (i.e. electrode 1) and second electrode (i.e. electrode 2)；First electricity
Pole is connected with the first input end of signal generating circuit, and second electrode is connected with the second input of signal generating circuit, signal
The output end that circuit occurs is connected with the signal input part of controller (not shown), between first electrode and second electrode
Resistance or electric capacity can change with liquid and be transferred to signal generating circuit, and signal generating circuit exports corresponding waveform letter
Number.In the present embodiment, signal generating circuit includes that the normal phase input end of the first amplifier U1A, the first amplifier U1A is distinguished
It is connected with one end of first resistor R1 (first resistor is adjustable resistance) and one end of 3rd resistor R3, the first amplifier U1A
Inverting input be connected with one end of second resistance R2 and one end of the first electric capacity C1 respectively；The other end of first resistor R1 with
Ground is connected, and the output end of the other end of second resistance R2 and the other end of 3rd resistor R3 respectively with the first amplifier U1A is connected；
The output end of the first amplifier U1A is connected with the signal input part of controller, the other end and the second electrode phase of the first electric capacity C1
Even, the other end of first resistor R1 is connected with first electrode.Wherein, controller is not limited to use single-chip microcomputer, it would however also be possible to employ its
The controller of his type.The signal generating circuit is not limited to using above-mentioned square waveform signal generating circuit, it would however also be possible to employ its
There is circuit or sinusoidal signal generation circuit in the signal generating circuit of his type, such as triangle signal.
In a kind of preferred embodiment of the present utility model, also including signal filter circuit, signal filter circuit it is defeated
Enter end to be connected with the output end of signal generating circuit, the output end of signal filter circuit is connected with the signal input part of controller；
Signal filter circuit includes the second electric capacity, the 3rd electric capacity, the 4th resistance and the 5th resistance, and one end of the second electric capacity C2 is respectively with the
One end of four resistance R4 is connected with one end of the 5th resistance R5, the other end of the 4th resistance R4 respectively with one end of the 3rd electric capacity C3
It is connected with ground, the other end of the 3rd electric capacity C3 is connected with the other end of the 5th resistance R5；The other end and first of the second electric capacity C2
The output end of amplifier U1A is connected, and the other end of the 5th resistance R5 is connected with the signal input part of controller.In present embodiment
In, signal filter circuit can also use π types filter circuit or L-type filter circuit.
In a kind of preferred embodiment of the present utility model, also including signaling conversion circuit, signaling conversion circuit it is defeated
Enter end to be connected with the output end of signal generating circuit, the output end of signaling conversion circuit is connected with the signal input part of controller；
Signaling conversion circuit includes the first diode D1, and the positive pole of the first diode D1 is connected (i.e. with the output end of signal generating circuit
It is that the positive pole of the first diode D1 is connected with the output end of the first amplifier U1A), negative pole and the controller of the first diode D1
Signal input part is connected.In the present embodiment, also including the 4th electric capacity and the 6th resistance, one end and the 6th of the 4th electric capacity C4
Negative pole of the one end of resistance R6 respectively with the first diode D1 is connected, and the other end of the 4th electric capacity C4 and the 6th resistance R6's is another
End is connected to the ground respectively.
In a kind of preferred embodiment of the present utility model, also including signal comparator circuit, signal comparator circuit it is defeated
Enter end to be connected with the output end of signal generating circuit, the output end of signal comparator circuit is connected with the signal input part of controller；
The inverting input of signal comparator circuit including the second amplifier U2A, the second amplifier U2A respectively with one end of the 7th resistance R7
One end with the 8th resistance R8 is connected, and the other end of the 7th resistance R7 is connected with power supply VCC, the other end and the ground of the 8th resistance R8
It is connected；The normal phase input end of the second amplifier U2A is connected with the output end of the first amplifier U1A, the output of the second amplifier U2A
End is connected with the signal input part of controller.
Above-mentioned signal filter circuit, signaling conversion circuit and signal comparator circuit are not limited to be connected to signal generating circuit
And controller between；Can also be directly that the output end of signal generating circuit is connected with the input of signal filter circuit, signal
The output end of filter circuit is connected with the input of signaling conversion circuit, the output end and signal comparator circuit of signaling conversion circuit
Input be connected, the output end of signal comparator circuit is connected with the signal input part of controller.Its specific annexation is：The
One electrode is connected with the other end of first resistor R1, and second electrode is connected with the other end of the first electric capacity C1, the first amplifier U1A
Normal phase input end be connected with one end of first resistor R1 and one end of 3rd resistor R3 respectively, the first amplifier U1A's is anti-phase
Input is connected with one end of second resistance R2 and one end of the first electric capacity C1 respectively；The other end of first resistor R1 and ground phase
Even, the output end of the other end of second resistance R2 and the other end of 3rd resistor R3 respectively with the first amplifier U1A is connected, and first
The output end of amplifier U1A is connected with the other end of the second electric capacity C2, and one end of the second electric capacity C2 is respectively with the 4th resistance R4's
One end is connected with one end of the 5th resistance R5, and the other end of the 4th resistance R4 is connected with one end and ground of the 3rd electric capacity C3 respectively,
The other end of the 3rd electric capacity C3 is connected with the other end of the 5th resistance R5, the other end of the 5th resistance R5 and the first diode D1's
Positive pole is connected, and the negative pole of the first diode D1 is connected with the normal phase input end of the second amplifier U2A, and the second amplifier U2A's is anti-
Phase input is connected with one end of the 7th resistance R7 and one end of the 8th resistance R8 respectively, the other end and power supply of the 7th resistance R7
VCC is connected, and the other end of the 8th resistance R8 is connected to the ground, the output end of the second amplifier U2A and the signal input part of controller
It is connected.In addition, the first amplifier and the second amplifier use dual power supply amplifier.
In a kind of preferred embodiment of the present utility model, also including the 5th electric capacity, one end and the ground phase of the 5th electric capacity
Even, the other end of the 5th electric capacity is connected with the signal input part of controller.
In a kind of preferred embodiment of the present utility model, electrode is constituted using conductive material.In the present embodiment,
Electrode is not limited to the corrosion resistant conductive material such as stainless steel or graphite and is made, it would however also be possible to employ the stronger argent of conductive capability
As electrode.
The utility model additionally provides a kind of blood purification liquid level detection system of use electrode liquid level detection circuit, by
One electrode and second electrode are arranged in the blood purification tank in blood purification system.Can specifically be closed using following connection
System：As shown in figure 4, first electrode is connected with the other end of first resistor R1, the other end phase of second electrode and the first electric capacity C1
Even, first electrode and second electrode are arranged in the blood purification tank in blood purification system, wherein, the installation of electrode
Position can be configured according to actual conditions, the normal phase input end of the first amplifier U1A respectively with one end of first resistor R1
One end with 3rd resistor R3 is connected, the inverting input of the first amplifier U1A respectively with one end of second resistance R2 and first
One end of electric capacity C1 is connected；The other end of first resistor R1 is connected to the ground, the other end of second resistance R2 and 3rd resistor R3's
Output end of the other end respectively with the first amplifier U1A is connected, and the output end of the first amplifier U1A is another with the second electric capacity C2's
End is connected, and one end of the second electric capacity C2 is connected with one end of the 4th resistance R4 and one end of the 5th resistance R5 respectively, the 4th resistance
The other end of R4 is connected with one end and ground of the 3rd electric capacity C3 respectively, and the other end of the 3rd electric capacity C3 is another with the 5th resistance R5
End is connected, and the other end of the 5th resistance R5 is connected with the positive pole of the first diode D1, and the negative pole of the first diode D1 is put with second
The normal phase input end of big device U2A is connected, the negative pole of the first diode D1 also with one end of the 6th resistance R4 and the 4th electric capacity C4
One end is connected, and the other end of the 6th resistance R4 and the other end of the 4th electric capacity C4 are connected to the ground, and the second amplifier U2A's is anti-phase defeated
Enter end to be connected with one end of the 7th resistance R7 and one end of the 8th resistance R8 respectively, the other end and the power supply VCC of the 7th resistance R7
It is connected, the other end of the 8th resistance R8 is connected to the ground, the output end of the second amplifier U2A and the signal input part phase of controller
Even, the signal input part of controller is connected with one end of the 5th electric capacity C5, and the other end of the 5th electric capacity C5 is connected to the ground.
Operation principle of the present utility model：
When the liquid in blood purification tank is conducting liquid, liquid is just equivalent to a resistance R0, as long as resistance R0 is small
In first resistor R1, signal generating circuit can just produce vibration, export square waveform signal, then by signal filter circuit, it is defeated
Go out the frequency signal of interval range, then by signaling conversion circuit, the positive square-wave signal of output is more electric finally by signal
Road, judges the size of the signal and the size of the signal of setting, and final controller need to only judge the electricity of signal comparator circuit output
Flat height just can directly judge whether electrode soaks in a liquid；When electrode does not soak in a liquid, two electrodes it
Between equivalent resistance it is infinitely great, signal generating circuit cannot output signal.The electrical conductivity one of the reverse osmosis water in blood cleaning equipment
As in 10ms/cm or so, equivalent resistance between electrodes is less than 100K Ω, when R1 is set greater than 100K Ω, the inspection
Slowdown monitoring circuit or system can detect the relatively low reverse osmosis water liquid level of electrical conductivity, while R1 can be adjusted according to the electrical conductivity of detection liquid
Resistance, is applied to different level sensing environment.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the present utility model or example.In this manual, to the schematic table of above-mentioned term
State and be not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or feature can be
Combined in an appropriate manner in one or more any embodiments or example.
While there has been shown and described that embodiment of the present utility model, it will be understood by those skilled in the art that：
In the case where principle of the present utility model and objective is not departed from various changes, modification, replacement can be carried out to these embodiments
And modification, scope of the present utility model limits by claim and its equivalent.
Claims (10)
1. a kind of electrode liquid level detection circuit, it is characterised in that including electrode, signal generating circuit and controller, the electrode
Including first electrode and second electrode；
First electrode is connected with the first input end of signal generating circuit, the second input of second electrode and signal generating circuit
It is connected, the output end of signal generating circuit is connected with the signal input part of controller, between the first electrode and second electrode
Resistance or electric capacity can change with liquid and be transferred to signal generating circuit, the signal generating circuit output is corresponding
Waveform signal.
2. electrode liquid level detection circuit according to claim 1, it is characterised in that the signal generating circuit includes first
Amplifier, the normal phase input end of the first amplifier is connected with one end of first resistor and one end of 3rd resistor respectively, and first puts
The inverting input of big device is connected with one end of second resistance and one end of the first electric capacity respectively；The other end of first resistor and ground
It is connected, the output end of the other end of second resistance and the other end of 3rd resistor respectively with the first amplifier is connected.
3. electrode liquid level detection circuit according to claim 1, it is characterised in that described also including signal filter circuit
The input of signal filter circuit is connected with the output end of signal generating circuit, output end and the controller of signal filter circuit
Signal input part is connected；
The signal filter circuit includes the second electric capacity, the 3rd electric capacity, the 4th resistance and the 5th resistance, one end point of the second electric capacity
Be not connected with one end of the 4th resistance and one end of the 5th resistance, the other end of the 4th resistance respectively with one end of the 3rd electric capacity and
Ground is connected, and the other end of the 3rd electric capacity is connected with the other end of the 5th resistance.
4. electrode liquid level detection circuit according to claim 1, it is characterised in that described also including signaling conversion circuit
The input of signaling conversion circuit is connected with the output end of signal generating circuit, output end and the controller of signaling conversion circuit
Signal input part is connected；
The signaling conversion circuit includes the first diode, the positive pole of the first diode and the output end phase of signal generating circuit
Even, the negative pole of the first diode is connected with the signal input part of controller.
5. electrode liquid level detection circuit according to claim 4, it is characterised in that also including the 4th electric capacity and the 6th electricity
Resistance, the negative pole of one end of the 4th electric capacity and one end of the 6th resistance respectively with the first diode is connected, the other end of the 4th electric capacity
The other end with the 6th resistance is connected to the ground respectively.
6. electrode liquid level detection circuit according to claim 1, it is characterised in that described also including signal comparator circuit
The input of signal comparator circuit is connected with the output end of signal generating circuit, output end and the controller of signal comparator circuit
Signal input part is connected；
The signal comparator circuit includes the second amplifier, the inverting input of the second amplifier respectively with one end of the 7th resistance
One end with the 8th resistance is connected, and the other end of the 7th resistance is connected with power supply, and the other end of the 8th resistance is connected to the ground.
7. electrode liquid level detection circuit according to claim 1, it is characterised in that also including the 5th electric capacity, the 5th electric capacity
One end be connected to the ground, the other end of the 5th electric capacity is connected with the signal input part of controller.
8. electrode liquid level detection circuit according to claim 1, it is characterised in that electrode is constituted using conductive material.
9. electrode liquid level detection circuit according to claim 8, it is characterised in that electrode is stainless steel or graphite.
10. the blood purification liquid level detection system of the described electrode liquid level detection circuits of one of a kind of use claim 1-9, its
It is characterised by, in the blood purification tank that first electrode and second electrode are arranged in blood purification system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621389939.2U CN206281549U (en) | 2016-12-16 | 2016-12-16 | Electrode liquid level detection circuit and for blood purification liquid level detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621389939.2U CN206281549U (en) | 2016-12-16 | 2016-12-16 | Electrode liquid level detection circuit and for blood purification liquid level detection system |
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| CN206281549U true CN206281549U (en) | 2017-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621389939.2U Active CN206281549U (en) | 2016-12-16 | 2016-12-16 | Electrode liquid level detection circuit and for blood purification liquid level detection system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414050A (en) * | 2018-04-13 | 2018-08-17 | 航天科技控股集团股份有限公司 | Electric pole type liquid level detection circuit |
| CN109238397A (en) * | 2017-07-10 | 2019-01-18 | 广州康昕瑞基因健康科技有限公司 | liquid detecting circuit |
| CN110207383A (en) * | 2018-12-06 | 2019-09-06 | 华帝股份有限公司 | Condenser heat exchanger, condensing gas water heater and detection method |
| CN111397693A (en) * | 2020-04-26 | 2020-07-10 | 上海明略人工智能(集团)有限公司 | Electrode type liquid level detection assembly, liquid level switch and dish washing machine |
| US11499884B2 (en) | 2018-07-24 | 2022-11-15 | Invensense, Inc. | Liquid detection in a sensor environment and remedial action thereof |
-
2016
- 2016-12-16 CN CN201621389939.2U patent/CN206281549U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238397A (en) * | 2017-07-10 | 2019-01-18 | 广州康昕瑞基因健康科技有限公司 | liquid detecting circuit |
| CN108414050A (en) * | 2018-04-13 | 2018-08-17 | 航天科技控股集团股份有限公司 | Electric pole type liquid level detection circuit |
| US11499884B2 (en) | 2018-07-24 | 2022-11-15 | Invensense, Inc. | Liquid detection in a sensor environment and remedial action thereof |
| TWI811403B (en) * | 2018-07-24 | 2023-08-11 | 美商伊凡聖斯股份有限公司 | Electronic device for liquid detection in a sensor environment and remedial action thereof |
| CN110207383A (en) * | 2018-12-06 | 2019-09-06 | 华帝股份有限公司 | Condenser heat exchanger, condensing gas water heater and detection method |
| CN111397693A (en) * | 2020-04-26 | 2020-07-10 | 上海明略人工智能(集团)有限公司 | Electrode type liquid level detection assembly, liquid level switch and dish washing machine |
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