CN1285890C

CN1285890C - Water level measuring apparatus

Info

Publication number: CN1285890C
Application number: CN 200410027701
Authority: CN
Inventors: 李虬
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-06-18
Filing date: 2004-06-18
Publication date: 2006-11-22
Anticipated expiration: 2024-06-18
Also published as: CN1595075A

Abstract

The present invention relates to a water level measurement instrument which comprises detection electrodes, a display circuit, a detection control circuit and a power supply circuit, wherein the detection electrodes are more than two, and the detection electrodes comprise liquid level electrodes and a loop electrode arranged at the bottom of the liquid level. The detection control circuit comprises a pulse generating circuit, a processing circuit composed of a semiconductor switch tube, and a coupling circuit connected with the liquid level electrodes. The coupling circuit has three heads, and moreover, the three heads are respectively connected with an output terminal of the pulse generating circuit, an input terminal of the processing circuit and one of liquid level electrodes. The loop electrode is connected with an earth wire of a power supply. The pulse generating circuit sends pulse electric waves with a certain duty ratio to the liquid level electrodes by the coupling circuit. The processing circuit processes the electric potential of the liquid level electrodes and sends a liquid level signal to a display circuit and/or an external circuit by the corresponding coupling circuit. The water level measurement instrument of the present invention has the advantages of wide measurement adaptive range, less measurement energy consumption, low electrode corrosion degree and convenient liquid level control.

Description

Floodometer

[technical field]

The present invention relates to the detection control apparatus of water level, more particularly, the present invention relates to the monitoring regulating device of liquid level in a kind of water liquid cultivation.

[background technology]

Water liquid cultivation is widely adopted in now flowers and industrialized cultivation, cultivation.The water class I liquid I is as a kind of electric conductivity, the liquid of low pole, existence and development for nature and human society, continuity has conclusive effect, various water class I liquid Is are in industry, agricultural, hospital, every field such as family daily life, various aspects are adopted widely, the monitoring regulating device of water level correspondingly, social activities for people's every aspect also has considerable meaning with development, at the technology and equipment in this field also numerous and complicated, varied, these existing technology and equipments have certain merits and demerits separately, for example: the ball float probe is widely adopted within many water class saving containers, but the buoyancy of ball float probe is subjected to strength of fluid, Temperature Influence measured value out of true, and exist as impurity, can produce precipitation on the ball float surface, sticking dead ball float influence is used; Drum type brake liquid level gauge and for example, can Direct observation obtain the liquid level in the liquid storage groove, but the drum type brake liquid level gauge has the requirement of brightness aspect to environment for use, and the factors such as impurity in the connection state between drum type brake liquid level gauge and liquid storage groove, the liquid also can influence the reflection of drum type brake liquid level gauge to true liquid level in the liquid storage groove.In sum, the application of the liquid level gauge of above-mentioned two major types is subjected to condition restriction, and because liquid probe is not inserted in the conducting liquid, can not record the immediate data of liquid level, can not compensate and subsequent treatment measured liquid level signal, therefore, can only do general, coarse measurement and monitoring, be difficult to realize the automatic monitoring control of liquid level conductive liquid level.

For the deficiency of above-mentioned level gauging technology, electronic monitoring provides the possibility that overcomes above-mentioned shortcoming; Electronic monitoring will patch in the conducting liquid between various types of electrodes, utilize type telecommunications such as resistance between the electrode or electric capacity number to measure with the variation of liquid level, since adopt electric signal to follow the tracks of liquid level, be suitable for automatic control, and be convenient to measuring error is compensated.But, because conducting liquid has very strong polarity usually, usually also can dissolve electrolyte, negative ions or the impurity that enters some strong polarity in the conducting liquid in addition, the electrolyte of these strong polarity, negative ions or impurity and conducting liquid self can produce the negative effect that some are difficult to eliminate to liquid probe, as to measure electric current be that power consumption is bigger, electrode probe is easy measured current electroanalysis, burn into fouling in having strong polar electrolyte, negative ions solution, thereby causes shorten electrode life, test error is excessive and even malfunctioning.

Above-mentioned shortcoming at present electronic monitoring liquid level gauge existence, existing various technical solutions see in the relevant technical literature: the file of Chinese patent 90109887.6 discloses a kind of water level gage with electrode alarm, this device is the situation at bipolar electrode bushing type probe, because the accumulation incrustation scale can make the short circuit of original insulation jacket layer and make the bipolar electrode probe send wrong signal to testing circuit between the bipolar electrode, in order to address the above problem, this device has adopted the remedial measures of some circuit aspects, promptly on the liquid level signal input circuit of original amplifying circuit, add shunt resistance and voltage stabilizing diode, thereby make its output loop output level can not produce error signal because of accumulation incrustation scale between the bipolar electrode.After the shunt resistance of this device must produce the probe place of scale build-up according to artificial discovery, finding the corresponding processing parallel circuit of this probe to regulate little realization of shunting TV university manually again compensates, obviously, the mode of this device compensation is very backward, and what flow through is direct current between the electrode of probe, has still that power consumption is big, the electrode corrosion problem.

China Patent No. is that 94236213.6 file has disclosed a kind of high precision probe that electrical heating steam boiler middle water level detects control that is used for that has anti-ripple cover around electrode, it is provided with one the electrode hood protection interlayer that anti-ripple overlaps and the cock head is formed therebetween around the electrode group, lower surface at this anti-ripple cover is provided with the damping inlet opening, take such structure can stop the fouling of impurity on electrode surface in the boiled water really to a certain extent, but because in the possibility fouling equally of surface, damping inlet opening, the stop measuring accuracy and the compensation computational accuracy that can make water level of damping inlet opening all are affected, so only be suitable for the occasion not high to the level gauging accuracy requirement, and this technical solution can not solve, and the measurement electric current will be difficult to lastingly the electrolytic corrosion effect of metal electrode electrode life in measuring process incessantly for years; In like manner, measuring spent electric energy also has considerable part to expend in the electrolysis of electrode, has increased many idle work consumption on foot.

And for example the file of Chinese patent 01244538.X discloses a kind of condensate tank of dehumidifier that adopts single-chip microcomputer to add resistance and probe, the resistance string of this device is associated on the I/O interface of single-chip microcomputer, and on the I/O interface, set up 5 volts input voltage, when two probes interconnect owing to water level rises, be equivalent to shunt resistance in parallel between described resistance and I/O interface 20 and 18 than low value, thereby original ohmically voltage is reduced to below 4 volts, sends the full signal of water to single-chip microcomputer; Although this device has adopted the computing machine single-chip microcomputer as detection/control circuit, but that flows through between two probes in being deep into water remains DC current, and the bigger and corresponding electrolytic corrosion effect of the consumption of DC current between two metal probes still exists.

[summary of the invention]

The above-mentioned shortcoming that exists at prior art is with not enough, technical matters to be solved by this invention be to provide a kind of and measure wide accommodation, measure power consumption less, electrode corrosion is very little, the floodometer of being convenient to liquid level control.

For this reason, technical solution of the present invention is a kind of floodometer, this instrument comprises following parts: detecting electrode, display circuit, detect control circuit, power circuit, wherein, power circuit provides power supply to other circuit, detecting electrode is no less than two, comprising level electrode and a loop electrode that is located at the liquid level bottom, comprise pulse generating circuit and detect control circuit, by semiconductor switch pipe treatment circuit of forming and the coupled circuit that is connected with each level electrode, wherein, coupled circuit has three, these three respectively with the output terminal of pulse generating circuit, one of the input end of treatment circuit and level electrode link; And loop electrode is connected with the ground wire of power supply; Described pulse generating circuit sends the pulse radio with certain dutycycle through overcoupled circuits to level electrode, and treatment circuit is by the current potential of corresponding coupled circuit treating fluid potential electrode, and sends liquid level signal to display circuit and/or external circuit.Level measurement device of the present invention adopts pulse generating circuit to send the detection pulse radio to the exposed conductive core of all level electrodes, and the exposed conductive core by the loop electrode that is connected with power ground forms and detects the loop; The detection pulse radio that is flowed out by a certain coupled circuit contacts with liquid level and then forms potential change on this level electrode and coupled circuit, by treatment circuit the current potential on this level electrode and the coupled circuit being carried out following processing comprises: latch, scan, separate and latch, import, change and latch current potential and become corresponding liquid level signal, send liquid level signal then and give display circuit or send external circuit.The mode of level electrode signal takes place and obtains in the steady current of generally taking compared to prior art that utilizes; the detection mode that the present invention utilizes pulse radio to form liquid level signal has the advantage of saving electric energy significantly, and the detection mode of foregoing circuit structure and pulse radio also has the periodic inverse current of further formation is avoided the electrolytic corrosion of polar liquid with guard electrode architecture basics and advantage.

For obtaining comparatively practical measurement result, the coupled circuit number of level electrode of the present invention and connection thereof is no less than 2, and different level electrodes is installed in described measuring instrument longitudinally on the differing heights.For realizing more accurate level gauging, the coupled circuit number of level electrode and connection thereof can be above 2 even more.

Pulse generating circuit of the present invention is by two asymmetric multivibrators that connect and compose of negative circuit, adopt the resistance and the electric capacity of certain value in its circuit, make that the pulse generating circuit output duty cycle is 1～6: 1200 pulse radio, preferred dutycycle is 3: 1200.Like this, not only accurate as much as possible on the time span of year metering, simultaneously but the number of times and the time that reduce sampling as much as possible measure required electric energy to save.Very long and turn-on time quiescent interval that device of the present invention adopts multivibrator to produce the very short testing source that is the very low pulse of dutycycle as the metal electrode of test liquid level, like this for long-term Level Detection month after month, the saving of energy is with highly significant, and power consumption is low-down.

Apparatus of the present invention are further improved and are comprised: be connected with jumbo capacitor between loop electrode and the power ground, and level electrode is connected the output terminal of described pulse generating circuit by resistance circuit, that is to say that aforesaid coupled circuit is a resistance circuit.The present invention further increases the polyphone large value capacitor between the ground wire of loop electrode and power supply; simultaneously by the output terminal of pulse generating circuit and the charge/discharge loop of the resistance circuit formation of level electrode; like this; large value capacitor can be with the electrical power storage of the level electrode of flowing through in it; when testing circuit be in detect pulse signal vacant during; large value capacitor carries out periodicity with the electric energy of its storage by charging and discharging circuit and discharges and recharges; make and flow through inverse current on the metal electrode periodically; the top layer that metal electrode was loosened by electrolysis in last one-period is just oppositely deposited on the surface of metal electrode by next periodic reverse current; thereby make the electrolytic action of surface of metal electrode drop to minimum level, protected the metal detection electrode not to be subjected to galvanic corrosion effectively.Prove according to actual tests, through above-mentioned comprehensive improvement, floodometer of the present invention uses the miniature silver peroxide button dry cell of one～two joint as detecting the energy, just can guarantee at least one year continual measurement, thereby be convenient to very much floodometer of the present invention is made portable, miniaturization and even miniaturized devices.

Because in the test environment of relative closure or in the space of pocket instrument, to each other short circuit or shunting takes place because of the cohesion conducting liquid in adjacent detecting electrode surface easily, and signal leads to errors; In order to prevent the generation of this error signal, the present invention's design makes detecting electrode comprise the waterproof insulation sheath of conductive core and outer cladding thereof, and the lower end of conductive core exposes outside this insulating sheath in this detecting electrode.

For the ease of enforcement, liquid level gauge of the present invention specifically can be taked following structure promptly: the semiconductor switch pipe is formed the circuit or the integrated form logic chip circuit of discrete component.For ease of the structure with whole testing circuit and becoming one of level electrode, the preferred embodiments of the present invention take the integrated form logic gates to realize.

For ease of reminding user's attention, in the circuit of the present invention, described display circuit comprises electroacoustic and/or photoelectric display device.For example the integrated level of on-off circuit is different with mode according to the different connected modes of circuit, electroacoustic of the present invention and/or photoelectric display device be by all level electrodes share or with the different corresponding one by one connections of described level electrode.And then the method for attachment that can adopt electroacoustic and/or photoelectric display device and all level electrodes to share, so that circuit of the present invention is simple, compact conformation; Otherwise, as adopting the circuit mode of electroacoustic and/or photoelectric display device and the corresponding one by one connection of different level electrodes, then can utilize discrete device that liquid level detection electrode is increased, thus increase measuring point quantity and then raising measuring accuracy.

Significantly saving the test electric energy is main advantages of the present invention, utilizes this principal advantages, and power circuit of the present invention comprises dry cell and/or external power feed circuit and voltage detecting circuit.Measuring instrument of the present invention can be made pocket-sized like this, be easy to carry, use.

The interface circuit that sends liquid level signal to external circuit that is provided with of the present invention under the situation of having ready conditions, being necessary, can be operated control so more widely under the external circuit support.

As the preferred embodiments of the present invention be a kind of pen type measuring instrument, the floodometer of this pen type is formed by removably connecting between upper and lower two long cylindrical shells; Be equiped with described detection control circuit, power circuit, display circuit in its upper shell; The lower shell bottom offers several permeable holes, lower shell top offers ventilative liquid level upper limit hole, the top of lower shell is a seal face, be fixed with described detecting electrode on the top of described lower shell, the upper end of detecting electrode is stretched out with circuit the described upper shell from the upper surface on described top and is connected, and the bottom of described detecting electrode and lower end are deep on the different height in the described lower shell.Wherein, the tube structure test that is easy to carry, permeable hole, ventilative liquid level upper limit pore structure can guarantee that very fast and the tested liquid level of liquid level reaches balance in the cylindrical shell, alleviate fluctuation, raising efficiency of measurement and accuracy; The permeable hole that the ventilative liquid level upper limit hole that lower shell top is offered is offered with the lower shell bottom; both can allow the liquid in the liquid container to enter in the lower shell of pen type measuring instrument; can limit liquid level again surpasses the upper limit hole of lower shell and produces and overflow the liquid error; and above-mentioned no liquid zone constitutes the insulation isolated area, can protect the reliable long-term working of the electrical equipment on top.Obviously for different liquid containers and different liquid level change amplitudes, should adopt the pen type measuring instrument of different size.Being detachably connected as between upper and lower two long cylindrical shells of the floodometer of apparatus of the present invention is threaded or nested being connected.

Detect control circuit for ease of butt joint, the extension line of detecting electrode of the present invention upper end has the connection-peg structure; For ease of connecting external circuit, offer the interface of output liquid level signal on the upper shell of the present invention.Of the present invention these feature that removably connects is convenient to assembling, demolition, repair, replacement, charging etc., and is convenient to realize flexibly connecting with the circuit of external control topworks.

Said apparatus of the present invention is adapted to the measurement control of the low pole liquid level of numerous species, is applicable to that especially the liquid level of manual watering and automatic-watering formula is reported to the police and automatic shutter pouring water pump automatically.When battery capacity was not enough, watch-dog can send the signal of special warning and change battery with prompting.Change nearly a year of one-shot battery energy continuous working.

The invention will be further described below in conjunction with drawings and the specific embodiments.

[description of drawings]

Fig. 1 is the schematic block circuit diagram of floodometer embodiment of the present invention.

Fig. 2 is the circuit interconnect pattern of the embodiment of the invention.

Fig. 3 is the contour structures synoptic diagram of floodometer embodiment of the present invention.

[embodiment]

Embodiment 1

As shown in Figure 1: a kind of floodometer, this instrument comprises following parts: detecting electrode 100, display circuit 200, detect control circuit 300, power circuit 400, wherein, power circuit 400 provides power supply to other circuit, described detecting electrode 100 is no less than two, comprising level electrode 110 and a loop electrode 120 that is located at the liquid level bottom, comprise pulse generating circuit 310 and detect control circuit 300, by semiconductor switch pipe treatment circuit of forming 320 and the coupled circuit 330 that is connected with each level electrode 110, wherein, coupled circuit 330 has three, these three respectively with the output terminal of pulse generating circuit 310, one of the input end of treatment circuit 320 and level electrode 110 link; And loop electrode 120 is connected with the ground wire of power supply; Pulse generating circuit 310 sends the pulse radio with certain dutycycle through overcoupled circuits 330 to level electrode 110, treatment circuit 320 is by the current potential of corresponding coupled circuit 330 treating fluid potential electrodes 110, and sends liquid level signal to display circuit 200 and/or external circuit.Described semiconductor switch pipe forms some logic gates.

Wherein, pulse generating circuit 310 is output duty cycle to be the multivibrator of 3: 1200 pulse electric energy, and this multivibrator is by two asymmetric connecting and composing of negative circuit.Treatment circuit 320 is provided with the interface circuit 321 that sends liquid level signal to external circuit.

Be connected with jumbo capacitor C8 between loop electrode 120 and the power ground, the circuit that coupled circuit 330 constitutes for resistance, level electrode 110 is connected the output terminal of described pulse generating circuit 310 by resistance circuit.

Level electrode 110 and coupled circuit 330 numbers that connect thereof are 3, and different level electrodes 110 is installed in measuring instrument longitudinally on the differing heights.

Embodiment 2

As shown in Figure 2: a kind of floodometer of the present invention, this instrument comprises following parts:

Detecting electrode 100 is divided into two classes according to function: 110 two of level electrodes: 110B, 110C are located at respectively on the different liquid levels; 120 1 of loop electrodes are located at the liquid level bottom.Two

level electrode

110B, 110C are connected by R3, R4 AND circuit 7,9 respectively, the lower end is inserted the different depth in the liquid respectively, loop electrode 120 1 ends are connected with power ground by large value capacitor C8, the other end is deep into the fluid to be measured lowermost end, constitutes the current return with a certain level electrode 110;

Display circuit 200 comprises signal amplification circuit, hummer B and the light prompting light emitting diode D0 that shows signal generation circuit that gate circuit 3,4 constitutes, BG1 etc. form, and therefore, the prompting and the signal of various ways can take place display circuit 200.Gate circuit 3,4 constitutes multivibrator and produces about 1.4 seconds square-wave signal of cycle, exports to BG1, and is controlled by 0,1 output signal of not gate (phase inverter) 8.

Power circuit 400 comprises the voltage detecting circuit 410 that gate circuit 1 and voltage stabilizing diode DW constitute, and in addition, dry cell 420 is connected between VD and the ground wire, and external power feed circuit 430 connections are similar thereby omit and do not draw.When battery capacity was not enough, display circuit 200 can be pointed out the replacing battery.Wherein, power circuit 400 provides electric energy to all circuit units respectively by voltage stabilizing diode DW.

Comprise pulse generating circuit 310 and treatment circuit 320 and detect control circuit 300; What wherein pulse generating circuit 310 was added by two not gates (phase inverter), 5,6 asymmetric connections mainly that element such as relevant capacitor forms can output duty cycle be the multivibrator of the detection electric signal of 3: 1200 long pause short pulses, and the output terminal of pulse generating circuit 310 is that the tie point of not gate 5,6 is connected with different coupled circuits 330 and level electrode 110 by resistance circuit.Be connected by jumbo capacitor C8 between the ground wire of loop electrode 120 and power supply.

320 two input ends of treatment circuit are connected with two

level electrode

110B, 110C by two coupled circuits 330,330 ' respectively, wherein, level electrode 110C is installed in measuring instrument longitudinally on the high height and be connected with Sheffer stroke gate 7 by coupled circuit 330 ', R3.Two different coupled circuits 330,330 ' comprise resistance R 1, R3 and R2, the R4 of pair of series respectively, different coupled circuit 330,330 ' output terminal are connected with an input end of Sheffer stroke gate 7 or 10 respectively, Sheffer stroke gate 7 and 10 output terminal respectively with another input end of the other side's gate circuit formation reciprocal relationship that links, and between the Sheffer stroke gate 10 that is connected with the coupled circuit 330 of initial liquid level and this level electrode also string one not gate 9 arranged, make the purpose that current potential overturns with the relative coupled circuit on it of the current potential of the highest coupled circuit 330 realizing joining with liquid.Under the coordination of the treatment circuit 320 that constitutes by not gate 7,10 reciprocal connections and other elements etc., the level signal of picking up level electrode 110 through overcoupled circuits 330 or 330 ' is handled the back by not gate 8 or door 2 again and is sent liquid level signal to display circuit 200, and the interface circuit of N point formation that also can be by D point and ground connection (in the corresponding diagram 1 321) sends liquid level signal to external circuit.

Treatment circuit 320 also further comprises the bistable circuit that door 11,12 is formed in Fig. 2, and this circuit constantly obtains 20 minutes short pulses once by the input end of door 12 and the R1 of coupled circuit 330 '; To the latching of the level signal respective cycle of level electrode 110, scan action, can make coupled circuit and level electrode follow the tracks of the reflection liquid level change more in real time by it, and the more various liquid level signal of output.

Embodiment 3

As shown in Figure 3: a kind of potted plant pen type floodometer of water planting that is used for of the present invention, this floodometer physical dimension is: long 115 millimeters, 15 millimeters of diameters can conveniently insert in the cultivation tray.This pen type floodometer is formed by removably connecting between upper and lower two long cylindrical shells 511,512; Be equiped with in its upper shell 511 and detect control circuit 300, power circuit 400, display circuit 200; Lower shell 512 bottoms offer several permeable holes 513, lower shell 512 tops offer ventilative liquid level upper limit hole 514, the top 516 of lower shell 512 is a seal face, top 516 at lower shell 512 is fixed with detecting electrode 100, the upper end of detecting electrode 100 is stretched out with circuit the upper shell 511 from the upper surface on top 516 and is connected, and the bottom of detecting electrode 100 and lower end be deep on the different height in the lower shell 512; The extension line of detecting electrode 100 upper ends has the connection-peg structure; On upper shell 511, offer the interface (not shown) of output liquid level signal.

Further explain floodometer principle of work of the present invention below in conjunction with accompanying drawing 2,3:

Last level electrode 110C is connected to an output terminal of 7 by R3, and following level electrode 110B is controlled by 6 output terminal by R4 through 9 output terminal, R2.

When level electrode 110B did not connect liquid instantly, following level electrode 110B was noble potential " 1 ", 9 outputs " 0 ", and 10 outputs " 1 " are that D point and the N point that cooperates ground connection can drive liquid pump running liquid feeding to extraneous liquid pump circuit output drive signal through R16.Simultaneously, 7 output " 0 " lockings 10 keep output " 1 ", and not gate 9 outputs " 0 ", are sent BG1 to carry out electric current and amplified and drive hummer B and light emitting diode D0 sent acousto-optic low-water level alerting signal successively every 20 minutes to diode D8 through 2 anti-phase outputs " 1 ".

Instantly level electrode 110B connects liquid but liquid level when being lower than most significant digit, (resistance value of liquid is far below the resistance 33K of R4 by liquid through level electrode 110B for the input end of door 9, can be considered good conductor) be connected to the positive pole of C8, C8 directly charges to capacitor, and R2 one be connected to 6 output terminal, because pulse perdurability much smaller than the quiescent interval of 6 outputs and the time constant of R2C8, thereby, the positive pole of capacitor C8 is equivalent to the direct negative pole by level electrode 110B again under full condition, C8 is in regularly charging and discharging process; 120 at level electrode 110B and electrode flow through for alternating current, thereby the corrosive attack of electrode can be reduced to minimumly, even also have a fixed electrode repair.At this moment, door 9 is output as " 1 ", through anti-phase be " 0 ", thereby D8 is by stopping warning; Though 10 ends that link to each other with 9 output terminal are " 1 ", 10 ends that link to each other with door 7 output terminals still are electronegative potential, so still output " 1 " of door 10 is that D point, the N point that cooperates ground connection are to extraneous liquid pump circuit still output drive signal drive pumped liquid through R16.

When liquid level continues to raise, last level electrode 110C connects liquid, liquid level reaches most significant digit, an input end of door 7 is connected the C8 positive pole through last level electrode 110C, liquid, be equivalent to direct negative pole ground wire, current potential become " 0 ", then output is turned over and is " 1 ", door 10 outputs is turned over be " 0 ", and extraneous liquid pump circuit quits work.Because the input end noble potential of door 7 is taken from door 10 output terminals, then level electrode 110C is locked into electronegative potential when contact liq, and capacitor C8 still can carry out the discharge of periodic damping ground to level electrode 110C.And door 7 output terminals are when being " 1 ", also cross D2, R11 charges to C4, noble potential on the R11 makes door 8 outputs become " 0 ", gate circuit 3, the 4 generation work vibration of display circuit 200 is carried out electric current through output terminal, D9, the BG1 of door 4 and is amplified, and drives hummer B, luminotron D then and sends the full alerting signal of water.Change C4, R11 value can change the perdurability of alerting signal.

Except that foregoing circuit, hydroful alarm control when treatment circuit 320 also has bistable circuits that door 11,12 forms as the manual watering among the embodiment is used: reduce to lowest order B and just uprise current potential when following and become electronegative potential state to be measured because the input end of door 7 must be treated liquid level, and operations such as manual watering just begin might not all will wait water level to be lower than B the time or carry out, for this reason, introduce door 11,12 circuit.The input end of door 12 constantly obtains 20 minutes short pulses once by R1, when being lower than the C point, liquid level is higher than the B point, the pulse that R1 comes, make door 12 inputs " 1 ", output " 0 ", door 11 outputs " 1 " are direct current noble potential state to be measured and locking with level electrode 110C upset, the still output " 1 " of related feasible door 10 is that the D point drives pumped liquid to extraneous liquid pump circuit still output drive signal through R16; When liquid level during to the highest C point, the input end of door 12 is crossed liquid and is connect the anodal charging of C8, is equivalent to connection negative pole and ground wire, current potential becomes " 0 ", be output as " 1 ", then door 11 input " 1 " outputs " 0 ", door 12 input locking electronegative potentials, no DC current between C-A and have only pulse current that C8 is discharged and recharged, interpolar does not have electrolytic action, and this moment, door 12 outputs " 1 ", cross D3, R11 charges to C3, same may command door 8 sends the hydroful alerting signal.

Power circuit 400 comprises that gate circuit 1 input end makes battery voltage detection, per 20 minutes output terminal " 0 " current potentials by door 5 of R15 connect negative pole once, when the input end of door 1 as cell voltage VD is lower than cell voltage VD than the difference of voltage stabilizing diode voltage stabilizing value VW a half occurring, door 1 can be treated to undertension with this automatically: D10 is crossed in door 1 output " 1 " makes door 8 outputs become " 0 ", door 3,4 work, promptly sent the primary voltage alerting signal every 20 minutes, this alerting signal frequency is different from the hydroful alerting signal.

The running current of pen type floodometer of the present invention under non-alarm condition be less than 10Ma, and operating voltage 3V uses the silver peroxide battery of two coin shape, and operate as normal surpassed for 1 year continuously.

Apparently, floodometer of the present invention also can be used in the level gauging field of other relevant low pole solution.

Claims

1, a kind of floodometer, this instrument comprises following parts: detecting electrode (100), display circuit (200), detect control circuit (300), power circuit (400), wherein, power circuit (400) provides power supply to other circuit, described detecting electrode (100) is no less than two, comprising a level electrode (110) and a loop electrode (120) that is located at the liquid level bottom, described detection control circuit (300) comprises pulse generating circuit (310), by semiconductor switch pipe treatment circuit of forming (320) and the coupled circuit (330) that is connected with each level electrode (110), wherein, described coupled circuit (330) has three, these three respectively with the output terminal of described pulse generating circuit (310), one of the input end of described treatment circuit (320) and level electrode (110) link; And described loop electrode (120) is connected with the ground wire of power supply; Described pulse generating circuit (310) sends the pulse radio with certain dutycycle through overcoupled circuits (330) to level electrode (110), described treatment circuit (320) is by the current potential of corresponding coupled circuit (330) treating fluid potential electrode (110), and send liquid level signal to display circuit (200) and/or external circuit, it is characterized in that: described floodometer is formed by removably connecting between upper shell (511) and the lower shell (512); Be equiped with described detection control circuit (300), power circuit (400), display circuit (200) in its upper shell (511); Lower shell (512) bottom offers several permeable holes (513), lower shell (512) top offers ventilative liquid level upper limit hole (514), the top (516) of lower shell (512) is a seal face, top (516) at described lower shell is fixed with described detecting electrode (100), the upper end of detecting electrode (100) is stretched out with circuit the described upper shell (511) from the upper surface of described top (516) and is connected, and the bottom of described detecting electrode (100) and lower end are deep on the different height in the described lower shell (512).

2, floodometer as claimed in claim 1, it is characterized in that: described detecting electrode (100) comprises the waterproof insulation sheath (102) of conductive core (101) and outer cladding thereof, and the lower end of conductive core (101) exposes outside this insulating sheath (102) in this detecting electrode (100); Also be connected with jumbo capacitor (C8) between the ground wire of described loop electrode (120) and power supply, described level electrode (110) is connected by the output terminal of resistance circuit with described pulse generating circuit (310).

3, floodometer as claimed in claim 1 is characterized in that: described level electrode (110) and coupled circuit (330) number that connects thereof are no less than 2, and different level electrode (110) is installed in described measuring instrument longitudinally on the differing heights.

4, floodometer as claimed in claim 1 is characterized in that: described pulse generating circuit (310) is output duty cycle to be the multivibrator of 1～6: 1200 pulse electric energies, and this multivibrator is by two asymmetric connecting and composing of negative circuit.

5, floodometer as claimed in claim 1 is characterized in that: described treatment circuit (320) is discrete component formula circuit or the circuit that comprises integrated chip.

6, floodometer as claimed in claim 1 is characterized in that: described treatment circuit (320) is provided with the interface circuit (321) that sends liquid level signal to external circuit.

7, floodometer as claimed in claim 1 is characterized in that: the extension line of described detecting electrode (100) upper end has the connection-peg structure; On described upper shell (511), offer the interface of output liquid level signal.

8, floodometer as claimed in claim 1 is characterized in that: described display circuit (200) comprises electroacoustic and/or photoelectric display device.

9, floodometer as claimed in claim 1 is characterized in that: described power circuit (400) comprises dry cell (420) and/or external power feed circuit (430) and voltage detecting circuit (410).