CN104807753A - Double-chamber flow cell turbidity measurement system and control method thereof - Google Patents

Double-chamber flow cell turbidity measurement system and control method thereof Download PDF

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CN104807753A
CN104807753A CN201510259278.5A CN201510259278A CN104807753A CN 104807753 A CN104807753 A CN 104807753A CN 201510259278 A CN201510259278 A CN 201510259278A CN 104807753 A CN104807753 A CN 104807753A
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controlled valve
electrically
flow cell
threshold value
controller
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CN104807753B (en
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唐云建
胡晓力
董宁
莫斌
余名
韩鹏
孙怀义
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Chongqing Academy of Science and Technology
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Chongqing Academy of Science and Technology
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Abstract

The invention provides a double-chamber flow cell turbidity measurement system and a control method thereof. The double-chamber flow cell turbidity measurement system adopts a double-chamber flow cell with a defoaming chamber and a measurement chamber, the defoaming chamber and the measurement chamber can operate separately, the double-chamber flow cell turbidity measurement system can effectively take measurement accuracy, timeliness and system miniaturization requirement into account, moreover, the double-chamber flow cell turbidity measurement system can have high adaptability to a measurement environment with great turbidity change and bubble content, and a new implementation scheme is provided for turbidity measurement systems; furthermore, the control flow of the measurement control method of the double-chamber flow cell turbidity measurement system disclosed by the invention is simple, and besides, while high measurement accuracy is ensured, the timeliness of system measurement is increased; in addition, the double-chamber flow cell turbidity measurement system disclosed by the invention also can implement self-cleaning control to clean the double-chamber flow cell in order to reduce the situation that the accuracy of turbidity measurement is affected by dirt deposited in the double-chamber flow cell, decrease the false detection rate and increase measurement accuracy.

Description

A kind of two-chamber flow cell turbidimetry system and control method thereof
Technical field
The present invention relates to online water quality monitoring technical field, particularly a kind of two-chamber flow cell turbidimetry system and control method thereof.
Background technology
Turbidity is a kind of characteristic parameter of water body optical property, and it is one of important indicator still weighing water quality good degree not, is also the important evidence of examination water treatment efficiency, therefore, has very important realistic meaning to the on-line checkingi of water turbidity.Turbidity transducer is the effective tool of water turbidity on-line checkingi, usual employing flow cell provides the container of a splendid attire testing liquid as turbidity transducer, and read turbidity transducer by controller and detect the turbidimetry data that export and control display screen and shown, then form the turbidimetry system of water source to be measured being carried out to Turbidity measurement.
In turbidimetry system, except the measuring accuracy of turbidity transducer, the design also outbalance of flow cell, needs to consider that sample to be measured upgrades fast, bubble is eliminated, has certain self-cleaning function, adapted to many-sided factors such as different monitoring of environmental.When measuring under low turbidity (<0.5NTU), the result of the micro-bubble in water on turbidimetry has larger impact, the function of micro-bubble in the primary elimination liquid to be measured of turbidity flow-through cell.On-line monitoring requires that data can reflect the turbidity situation of current fluid to be measured in time, and the liquid to be measured in flow cell needs to upgrade in time.Due to long-time unattended operation, flow cell is inevitably introduced or is produced dirt, needs flow cell automatically can get rid of dirt.The various monitoring condition hydraulic pressure of flow cell application differ greatly, and different monitoring points exists the inconsistent situation of hydraulic pressure, even if same monitoring point also may exist the situation of the hydraulic pressure fluctuation of different time sections.This just requires that flow cell can adapt to different monitoring of environmental.
But in existing turbidimetry system, the design of flow cell is comparatively simple, is exactly a single cavity water storage container having into water and drain function usually, but the turbidimetry system of single cavity flow cell is adopted often to deposit deficiency in the following areas:
1, measurement accuracy and system compact are difficult to take into account:
Ensure the effective detection of turbidity transducer to testing liquid in flow cell, need flow cell to have enough degree of depth, hold the detection probe of turbidity transducer to ensure that it can be immersed in the testing liquid sample of flow cell accommodation; And simultaneously, certain defoaming effect is reached to ensure, the situation that reducing in testing liquid detection probe that the bubble dissipated to liquid surface is attached to turbidity transducer affects measuring accuracy occurs, and the testing liquid sample just needing flow cell to hold has the surface area of larger liquid level.Therefore, to reach the requirement of these two aspects to ensure measurement accuracy, flow cell needs to take into account the requirement that lateral extension area is comparatively large, the degree of depth is darker simultaneously, causes entire system volume larger; To make system compact as far as possible, being merely able to the lateral extension area reducing flow cell, will defoaming effect being affected, be difficult to the impact avoiding bubble on turbidity transducer measuring accuracy.
2, measurement accuracy and ageing being difficult to are taken into account:
If in order to reach good defoaming effect, needing must be larger by the flow cell Volume design of system, and in pond, liquid to be measured upgrades slowly, easily causes the ageing deficiency measured; If by water intake velocity and the inflow of increase flow cell, accelerate liquid to be measured in pond and upgrade, not only cause system water consumption large, also cause foam time to shorten simultaneously, affect defoaming effect.
3, the impact of bubble on measurement accuracy is difficult to avoid completely:
The detection probe of turbidity transducer is immersed in the testing liquid of flow cell accommodation carries out turbidimetry, testing liquid with stylish inflow flow cell needs the defoaming treatment carrying out a period of time, therefore the bubble produced in defoaming process is difficult to avoid being attached in detection probe, affects the measuring accuracy of turbidity transducer.
4, be difficult to adapt to bubble content and the measurement environment that changes greatly of turbidity.
For the liquid to be measured that air bubble content is more, if foam time is too short, do not reach enough defoaming effects; And for the liquid to be measured of higher turbidity, if foam time is long, the particulate matter that in flow cell, liquid to be measured suspends may start precipitation, causes measurement result not reflect actual conditions, and long-time use in rear flow cell will accumulate more dirt, affect the precision of later stage measurement; Therefore, be difficult to adapt to bubble content and the measurement environment that changes greatly of turbidity.
5, water feeding pressure is restricted:
Flow cell, in order to reach defoaming effect, needs to take open ventilation to design, therefore has comparatively strict requirement to water feeding pressure, is difficult to the measurement environment that adaptation water feeding pressure changes greatly.
Summary of the invention
For above shortcomings in prior art, the object of the present invention is to provide a kind of two-chamber flow cell turbidimetry system, in order to the flow cell turbidimetry system that solves prior art to measurement accuracy, ageing and system bulk miniaturization to take into account ability poor, be difficult to adapt to hydraulic pressure, the problem of measurement environment that bubble content, turbidity change greatly, for turbidimetry system provides a kind of new implementation.
For achieving the above object, present invention employs following technical scheme:
A kind of two-chamber flow cell turbidimetry system, comprise turbidity transducer, controller and two-chamber flow cell, described two-chamber flow cell comprises froth breaking cavity and measures cavity; The top of described froth breaking cavity is provided with vent port; Sidewall in froth breaking cavity is positioned at presetting froth breaking height of water level position and is provided with liquid level sensor, the sidewall of froth breaking cavity is connected with inlet channel higher than liquid level sensor height and position place, and described inlet channel is provided with into water electrically-controlled valve; The bottom of froth breaking cavity is connected with measurement cavity by connecting tube, and described connecting tube is provided with transfer electrically-controlled valve; The tip position height of described measurement cavity is not higher than the height of froth breaking cavity bottom its lowest position, and connecting tube is connected with measurement cavity, position is positioned at the bottom measuring cavity wall; The sidewall of measurement cavity is positioned at presetting measurement height of water level position and is provided with gap, the detection probe of described turbidity transducer stretches into be measured in cavity, and the position height of the detection probe of turbidity transducer in measurement cavity is lower than gap position height; The bottom measuring cavity is also connected with drainage pipeline, and described drainage pipeline is provided with draining electrically-controlled valve; The liquid level data collection terminal of described controller and turbidity data collection terminal carry out electric signal with the data output end of liquid level sensor and turbidity transducer respectively and are connected; The water intaking valve control output end of controller, transfer valve control output end and draining valve control output end are carried out electric signal with water inlet electrically-controlled valve, the electric control end that shifts electrically-controlled valve and draining electrically-controlled valve respectively and are connected; The data display translation end of controller carries out electric signal with the display input end of display screen and is connected.
In above-mentioned two-chamber flow cell turbidimetry system, as further improvement project, described froth breaking cavity entirety is in flat, and the bottom of froth breaking cavity is funnel-form, and its lowest position of its bottom funnel-shaped portion is connected with connecting tube.
In above-mentioned two-chamber flow cell turbidimetry system, as further improvement project, the bottom of described measurement cavity is funnel-form, and its lowest position of its bottom funnel-shaped portion is connected with drainage pipeline.
In above-mentioned two-chamber flow cell turbidimetry system, preferably, the water capacity that in described froth breaking cavity, presetting froth breaking height of water level position is corresponding is more than or equal to the water capacity that in measurement cavity, presetting measurement height of water level position is corresponding.
Correspondingly, present invention also offers the Survey control method of above-mentioned two-chamber flow cell turbidimetry system; For this reason, present invention employs following technical scheme:
Can embodiment as one, the Survey control method of above-mentioned two-chamber flow cell turbidimetry system, the inlet channel of two-chamber flow cell turbidimetry system is connected to water source to be measured, and controller startup Survey control is set, the Survey control of two-chamber flow cell turbidimetry system is performed as follows by controller:
1), when controller starts Survey control, presetting froth breaking time of repose threshold value T1, liquid rotating shift time threshold value T2 and water discharge time threshold value T3 is read; Then, step 2 is performed);
2) controller controls to cut out transfer electrically-controlled valve and draining electrically-controlled valve, opens into water electrically-controlled valve;
3) controller reads the output signal of liquid level sensor data output end, when the data output end output liquid level reading liquid level sensor puts signal in place, performs step 4);
4) controller controls to cut out water inlet electrically-controlled valve, after waiting for the duration of froth breaking time of repose threshold value T1, performs step 5);
5) controller controls to open transfer electrically-controlled valve, after waiting for the duration of liquid rotating shift time threshold value T2, performs step 6);
6) controller controls to cut out transfer electrically-controlled valve, read the output signal of turbidity transducer data output end, after the turbidimetry data that the data output end reading turbidity transducer transmits, controller controls display screen and shows turbidimetry data, and control to open draining electrically-controlled valve, after waiting for the duration of water discharge time threshold value T3, perform step 7);
7) controller controls to cut out draining electrically-controlled valve, opens into water electrically-controlled valve, and then redirect performs step 3).
Can embodiment as another kind, the Survey control method of above-mentioned two-chamber flow cell turbidimetry system, the inlet channel of two-chamber flow cell turbidimetry system is connected to water source to be measured, and controller startup Survey control is set, the Survey control of two-chamber flow cell turbidimetry system is performed as follows by controller:
1), when controller starts Survey control, presetting froth breaking time of repose threshold value T1, liquid rotating shift time threshold value T2 and water discharge time threshold value T3 is read; Then, step 2 is performed);
2) controller controls to cut out transfer electrically-controlled valve, opens into water electrically-controlled valve and draining electrically-controlled valve;
3) controller reads the output signal of liquid level sensor data output end, when the data output end output liquid level reading liquid level sensor puts signal in place, performs step 4);
4) controller controls to cut out water inlet electrically-controlled valve, after waiting for the duration of froth breaking time of repose threshold value T1, performs step 5);
5) controller controls to cut out draining electrically-controlled valve, opens transfer electrically-controlled valve, after waiting for the duration of liquid rotating shift time threshold value T2, performs step 6);
6) controller controls to cut out transfer electrically-controlled valve, open into water electrically-controlled valve, and read the output signal of the data output end of liquid level sensor and turbidity transducer, after the turbidimetry data that the data output end reading turbidity transducer transmits, controller controls display screen and shows turbidimetry data, and controls to open draining electrically-controlled valve, starts timing to water discharge time, and when the data output end output liquid level reading liquid level sensor puts signal in place, perform step 7);
7) controller controls to cut out water inlet electrically-controlled valve, after waiting for the duration of froth breaking time of repose threshold value T1, judges the duration now whether timing of water discharge time having been reached to water discharge time threshold value T3; If reach, then redirect performs step 5); If do not reach, then continue to wait for, until when reaching the duration of water discharge time threshold value T3 to the timing of water discharge time, redirect performs step 5).
In the Survey control method of above-mentioned two-chamber flow cell turbidimetry system, as further improvement project, in step 1, after controller reads presetting froth breaking time of repose threshold value T1, liquid rotating shift time threshold value T2 and water discharge time threshold value T3, in execution step 2) before, also perform following steps:
1s) controller controls to cut out water inlet electrically-controlled valve, opens transfer electrically-controlled valve and draining electrically-controlled valve, and after waiting for the duration of liquid rotating shift time threshold value T2, then perform step 2).
Correspondingly, present invention also offers the self-cleaning control method of above-mentioned two-chamber flow cell turbidimetry system; For this reason, present invention employs following technical scheme:
Can embodiment as one, the self-cleaning control method of above-mentioned two-chamber flow cell turbidimetry system, the inlet channel of two-chamber flow cell turbidimetry system is connected to cleaning water source, and controller is set starts self-cleaning control, the self-cleaning control of two-chamber flow cell turbidimetry system is performed as follows by controller:
1) when controller starts self-cleaning control, read presetting water discharge time threshold value T3 and scavenging period threshold value T4, then perform step 2);
2) controller controls to open into water electrically-controlled valve, transfer electrically-controlled valve and draining electrically-controlled valve, and starts to carry out timing to scavenging period;
3) controller is in the process of carrying out scavenging period timing, read the output signal of liquid level sensor data output end, if scavenging period timing not yet arrives the duration of scavenging period threshold value T4, the signal but the data output end output liquid level reading liquid level sensor puts in place, then perform step 4) immediately; If scavenging period timing arrives the duration of scavenging period threshold value T4, then redirect performs step 7);
4) controller controls to cut out water inlet electrically-controlled valve, and postpones 1 ~ 3 second, then performs step 5);
5) judge whether the scavenging period timing of current time arrives the duration of scavenging period threshold value T4, if then perform step 7), otherwise perform step 6);
6) control to open into water electrically-controlled valve, redirect performs step 3);
7) controller controls to cut out water inlet electrically-controlled valve, and after waiting for the duration of water discharge time threshold value T3, then control to close transfer electrically-controlled valve and draining electrically-controlled valve, self-cleaning control procedure completes.
Can embodiment as another kind, the self-cleaning control method of above-mentioned two-chamber flow cell turbidimetry system, it is characterized in that, the inlet channel of two-chamber flow cell turbidimetry system is connected to cleaning water source, and controller is set starts self-cleaning control, the self-cleaning control of two-chamber flow cell turbidimetry system is performed as follows by controller:
1) when controller starts self-cleaning control, read presetting water discharge time threshold value T3 and scavenging period threshold value T4, then perform step 2);
2) controller controls to open into water electrically-controlled valve and transfer electrically-controlled valve, closes draining electrically-controlled valve, and starts to carry out timing to scavenging period;
3) controller is in the process of carrying out scavenging period timing, read the output signal of liquid level sensor data output end, if scavenging period timing not yet arrives the duration of scavenging period threshold value T4, the signal but the data output end output liquid level reading liquid level sensor puts in place, then perform step 4) immediately; If scavenging period timing arrives the duration of scavenging period threshold value T4, then redirect performs step 9);
4) controller controls to cut out water inlet electrically-controlled valve;
5) postpone wait 1 ~ 3 second, then perform step 6);
6) judge whether the scavenging period timing of current time arrives the duration of scavenging period threshold value T4, if then perform step 9), otherwise perform step 7);
7) controller judges that data output end that whether current time still reads liquid level sensor exports liquid level and to put in place signal; If so, then redirect performs step 5); Otherwise, perform step 8);
8) control to open into water electrically-controlled valve, redirect performs step 3);
9) controller controls to cut out water inlet electrically-controlled valve, opens draining electrically-controlled valve, and after waiting for the duration of water discharge time threshold value T3, then control to close transfer electrically-controlled valve and draining electrically-controlled valve, self-cleaning control procedure completes.
Compared to prior art, the present invention has following beneficial effect:
1, two-chamber flow cell turbidimetry system of the present invention, have employed and have froth breaking cavity and measure the two-chamber flow cell of cavity, and the two can separate work, makes system while taking into account measurement accuracy, be conducive to the miniaturization of entire system volume.
2, two-chamber flow cell turbidimetry system of the present invention can take into account the miniaturization of measurement accuracy and overall volume, is also conducive to the renewal accelerating liquid to be measured in pond, promotes the ageing of measurement.
3, two-chamber flow cell turbidimetry system of the present invention, due to froth breaking cavity and the design of measuring connectivity structure between cavity, make from froth breaking cavity to the process measuring cavity transfer testing liquid, new bubble can not be produced in measurement cavity, and liquid to be measured is flowed stirring again, avoid suspended particle in liquid to be measured and leave standstill the adverse effect of sinking to turbidimetry authenticity, also avoid the contradiction on foam time and suspension sinking time simultaneously, system is possessed adapt to the ability of measurement environment that bubble content and turbidity change greatly.
4, in two-chamber flow cell turbidimetry system of the present invention, the froth breaking cavity of two-chamber flow cell can design in flat, to increase its lateral extension area, ensures defoaming effect, and the bottom of froth breaking cavity and measurement cavity all can be designed as funnel-form, reduces debris accumulation.
5, two-chamber flow cell turbidimetry system of the present invention, effectively can take into account measurement accuracy, ageing and system bulk miniature requirement, the measurement environment simultaneously changed greatly for bubble content, turbidity can possess good adaptive faculty, for turbidimetry system provides a kind of new implementation.
6, the Survey control method of two-chamber flow cell turbidimetry system of the present invention, its control flow is simple, and the dual chamber advantage of system can be utilized, the defoaming treatment controlled in froth breaking cavity is alternately able to executed in parallel with both measurement processing interval measured in cavity, save Measuring Time better, while guaranteeing good measurement accuracy, improve the ageing of systematic survey further.
7, two-chamber flow cell turbidimetry system of the present invention, because it possesses the structural advantage of two-chamber flow cell, except carrying out except turbidimetry, self-cleaning control can also be realized, two-chamber flow cell is cleaned, to reduce the situation because the accuracy of dirt to turbidimetry deposited in two-chamber flow cell has an impact, lower false drop rate, improve measurement accuracy.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram implementing structure of two-chamber flow cell turbidimetry system of the present invention.
Fig. 2 is the schematic diagram that two-chamber flow cell turbidimetry system of the present invention another kind implements structure.
Embodiment
Below in conjunction with the drawings and specific embodiments, two-chamber flow cell turbidimetry system of the present invention is further detailed.
The one that Fig. 1 shows two-chamber flow cell turbidimetry system of the present invention implements structural representation.As shown in Figure 1, two-chamber flow cell turbidimetry system of the present invention, comprises turbidity transducer 1, controller 2, especially unlike, also comprise a two-chamber flow cell 3.This two-chamber flow cell comprises froth breaking cavity 310 and measures cavity 320.Wherein, the top of froth breaking cavity 310 is provided with vent port 311; Sidewall in froth breaking cavity 310 is positioned at presetting froth breaking height of water level position and is provided with liquid level sensor 4, the water capacity that in froth breaking cavity, presetting froth breaking height of water level position (i.e. liquid level sensor position) is corresponding, actual is exactly the water requirement of water to be measured being carried out to a turbidimetry; The sidewall of froth breaking cavity 310 is communicated with inlet channel phase 312 higher than liquid level sensor height and position place, and inlet channel 312 is provided with into water electrically-controlled valve 5, in order to control opening or closing of water inlet; The bottom of froth breaking cavity 310 is connected with measurement cavity 320 by connecting tube 313, and connecting tube 313 is provided with transfer electrically-controlled valve 6, for controlling froth breaking intracavity liquid 310 to measuring opening or closing of cavity 320 transfer.The tip position height of cavity 320 is measured not higher than the height of its lowest position bottom froth breaking cavity 310 in two-chamber flow cell 3, and connecting tube 313 is connected with measurement cavity 320, position is positioned at the bottom measuring cavity wall, to ensure the flow direction in two-chamber flow cell; The sidewall of measurement cavity 320 is positioned at presetting measurement height of water level position and is provided with gap 321, too much water in two-chamber flow cell is allowed to flow out from gap, and the detection probe of turbidity transducer 1 stretches in measurement cavity 320, and the detection probe of turbidity transducer 1 is measuring the position height in cavity lower than gap 321 position height, to ensure that the liquid level measured in cavity meets the testing requirement of turbidity transducer; The bottom measuring cavity 320 is also connected with drainage pipeline 322, and this drainage pipeline 322 is provided with draining electrically-controlled valve 7, for controlling opening or closing of draining.And for controller 2, except the electrical connection between turbidity transducer 1 and display screen it, also add the electric connection structure with liquid level sensor 4 and each electrically-controlled valve, namely the liquid level data collection terminal of controller 2 and turbidity data collection terminal carry out electric signal with the data output end of liquid level sensor 4 and turbidity transducer 1 respectively and are connected, the water intaking valve control output end of controller 2, transfer valve control output end and draining valve control output end respectively with water inlet electrically-controlled valve 5, the electric control end of transfer electrically-controlled valve 6 and draining electrically-controlled valve 7 carries out electric signal connection, the data display translation end of controller 2 carries out electric signal with the display input end of display screen and is connected.Wherein, display can be independently, and also can be integrated in one with controller, therefore display is not shown in FIG.
Two-chamber flow cell turbidimetry system of the present invention, have employed the two-chamber flow cell with two cavitys, defoaming treatment can be carried out to testing liquid in froth breaking cavity, testing liquid after froth breaking enters to measure in cavity again and carries out turbidimetry by turbidity transducer, the two is separate, the detection probe that the bubble produced in defoaming process can be avoided to be attached to turbidity transducer affects measuring accuracy, make froth breaking cavity only can consider to increase the requirement of froth breaking area in design on lateral extension area simultaneously, and measure the requirement that cavity only needs to consider accommodation and submergence turbidity transducer detection probe in the degree of depth in design, therefore can respectively froth breaking cavity and measurement cavity volume be controlled to little as much as possible, as long as the water requirement of water to be measured being carried out to a turbidimetry can be met, thus be conducive to the miniaturization of entire system volume, and volume reduces the renewal being also conducive to accelerating liquid to be measured in pond, promote the ageing of measurement, in addition, owing to being communicated to the connecting tube of measuring cavity from froth breaking cavity and measuring the cavity position that is connected and be positioned at the bottom measuring cavity wall, when closing the drainage pipeline measuring cavity and carrying out turbidimetry, the liquid to be measured eliminating bubble flows into measurement cavity by connecting tube from bottom, avoid on the one hand and produce new bubble, eliminate bubble to be attached in turbidity transducer detection probe and to make on the other hand liquid to be measured again to flow stirring to the adverse effect measured, suspended particle is unlikely to precipitation, avoid suspended particle in liquid to be measured and leave standstill the adverse effect of sinking to turbidimetry authenticity, simultaneously because froth breaking is separate with measurement, it also avoid the contradiction on foam time and suspension sinking time, system possessed adapt to the ability of measurement environment that bubble content and turbidity change greatly.As can be seen here, two-chamber flow cell turbidimetry system of the present invention effectively can take into account measurement accuracy, ageing and system bulk miniature requirement, the measurement environment simultaneously changed greatly for bubble content, turbidity can possess good adaptive faculty, for turbidimetry system provides a kind of new implementation.
Two-chamber flow cell turbidimetry system of the present invention in the specific implementation, in order to increase froth breaking area as far as possible, ensures defoaming effect, and the froth breaking cavity entirety of two-chamber flow cell is preferably flat, to increase its lateral extension area.In addition, as shown in Figure 2, the bottom of the froth breaking cavity 310 of two-chamber flow cell 3 is preferably designed as funnel-form, and its lowest position of its bottom funnel-shaped portion is connected with connecting tube 313, so that the dirt in testing liquid flows out smoothly, reduce the debris accumulation in froth breaking cavity; Equally, the bottom of the measurement cavity 320 of two-chamber flow cell 3 is also preferably designed as funnel-form, and its lowest position of its bottom funnel-shaped portion is connected with drainage pipeline 322, and the dirt be convenient in testing liquid flows out smoothly, reduces the debris accumulation measured in cavity.In Fig. 2, the implication of other label is identical with Fig. 1.As for froth breaking cavity and the Capacity design measuring cavity, a demand fulfillment carries out the water requirement of a turbidimetry to water to be measured, specifically, the water requirement of water to be measured being carried out to a turbidimetry is determined by measurement cavity, and because the position height of the detection probe of turbidity transducer in measurement cavity is lower than gap position height, as long as so ensure that measuring the liquid level of testing liquid in cavity in testing process reaches gap position height (i.e. presetting measurement height of water level), get final product the detection probe of submergence turbidity transducer, ensure carrying out smoothly of Turbidity measurement, therefore, in the Capacity design of froth breaking cavity with measurement cavity, the water capacity that in froth breaking cavity, presetting froth breaking height of water level position (i.e. liquid level sensor position) is corresponding preferably can be more than or equal to measures the water capacity that in cavity, presetting measurement height of water level position (i.e. gap position) is corresponding, so just, the testing liquid amount after performing a defoaming treatment in froth breaking cavity of can guaranteeing enough meets measures the water requirement requirement that cavity carries out turbidimetry.And water inlet electrically-controlled valve, transfer electrically-controlled valve and the draining electrically-controlled valve in system, preferably all adopt switching regulator solenoid valve, because switching regulator solenoid valve is a kind of electrically-controlled valve comparatively commonly used, and its product technology is ripe, and cost is lower, is conducive to reducing hardware cost.As for controller, except execution is to except the turbidimetry data acquisition of turbidity transducer and display and control, only need to carry out the detection data acquisition of liquid level sensor and the switch control rule of team's water inlet electrically-controlled valve, transfer electrically-controlled valve and draining electrically-controlled valve, wherein, identical with to the data acquisition modes of turbidity transducer to the detection data acquisition modes of liquid level sensor, also can realize controlling by simple high/low level command to each electrically-controlled valve, be very ripe existing control technology.
When two-chamber flow cell turbidimetry system of the present invention is measured testing liquid, the inlet channel of two-chamber flow cell turbidimetry system is needed to be connected to water source to be measured, and controller startup Survey control is set, the Survey control process of two-chamber flow cell turbidimetry system after this just can be automatically performed by controller; Its simplest Survey control process can perform as follows:
A1), when controller starts Survey control, presetting froth breaking time of repose threshold value T1, liquid rotating shift time threshold value T2 and water discharge time threshold value T3 is read; Then, step a2 is performed).
A2) controller controls to cut out transfer electrically-controlled valve and draining electrically-controlled valve, opens into water electrically-controlled valve.
A3) controller reads the output signal of liquid level sensor data output end, when the data output end output liquid level reading liquid level sensor puts signal in place, performs step a4).
A4) controller controls to cut out water inlet electrically-controlled valve, after waiting for the duration of froth breaking time of repose threshold value T1, performs step a5).
A5) controller controls to open transfer electrically-controlled valve, after waiting for the duration of liquid rotating shift time threshold value T2, performs step a6).
A6) controller controls to cut out transfer electrically-controlled valve, read the output signal of turbidity transducer data output end, after the turbidimetry data that the data output end reading turbidity transducer transmits, controller controls display screen and shows turbidimetry data, and control to open draining electrically-controlled valve, after waiting for the duration of water discharge time threshold value T3, perform step a7).
7) controller controls to cut out draining electrically-controlled valve, opens into water electrically-controlled valve, and then redirect performs step a3).
Can see, in the above-mentioned Survey control process of two-chamber flow cell turbidimetry system of the present invention, each measuring process is divided in order to two stages, i.e. defoaming treatment stage and measurement processing stage, in each measuring process, testing liquid from water source to be measured first enters froth breaking cavity by inlet channel, and controller judges the inflow in froth breaking cavity by the output signal reading liquid level sensor data output end, when the data output end output liquid level reading liquid level sensor puts signal in place, show that the liquid level of the testing liquid in froth breaking cavity has reached presetting froth breaking height of water level position, controller then controls to cut out water inlet electrically-controlled valve and stops water inlet, start standing froth breaking, continue T1 duration, froth breaking gas is discharged from the vent port at froth breaking cavity top, after froth breaking terminates, controller controls to open transfer electrically-controlled valve, and to the testing liquid measured after cavity transfer defoaming treatment, transfer liquid continues T2 duration, afterwards, transfer electrically-controlled valve is closed, and carries out turbidimetry by turbidity transducer to the testing liquid measured in cavity, and after obtaining turbidimetry data, controller just controls to open draining electrically-controlled valve and starts draining, continues T3 duration, after draining completes, one-shot measurement process completes, and starts to perform measuring process next time.Wherein, the duration of T1 allows testing liquid leave standstill the long enough time in froth breaking chamber, and to ensure dissipation of air bubbles, usual value is 5 ~ 10 minutes; The duration of T2 allows the testing liquid in froth breaking cavity flow into measurement cavity completely, and the duration of T3 allows the testing liquid measuring cavity discharge completely, therefore the duration value of T2, T3 needs according to froth breaking cavity in two-chamber flow cell and the concrete volume design conditions measuring cavity and determines, is the empirical value under concrete performance.
Adopt above-mentioned Survey control process, defoaming treatment and measurement processing are that single-threaded mode is carried out successively, and after the defoaming treatment of each measuring process, measurement processing all complete, just start measurement processing next time, such advantage is that control procedure is comparatively simple, and is not easy to make mistakes, but shortcoming is also comparatively obvious, namely do not utilize dual chamber advantage to optimize measuring process well, shorten Measuring Time further.Therefore, in order to can Measuring Time be shortened, it is ageing that further lifting is measured, present invention also offers the Survey control flow process after a kind of improvement, the inlet channel of two-chamber flow cell turbidimetry system is connected to water source to be measured, and after controller startup Survey control is set, performed as follows by controller:
B1), when controller starts Survey control, presetting froth breaking time of repose threshold value T1, liquid rotating shift time threshold value T2 and water discharge time threshold value T3 is read; Then, step b2 is performed).
B2) controller controls to cut out transfer electrically-controlled valve, opens into water electrically-controlled valve and draining electrically-controlled valve.
B3) controller reads the output signal of liquid level sensor data output end, when the data output end output liquid level reading liquid level sensor puts signal in place, performs step b4).
B4) controller controls to cut out water inlet electrically-controlled valve, after waiting for the duration of froth breaking time of repose threshold value T1, performs step b5).
B5) controller controls to cut out draining electrically-controlled valve, opens transfer electrically-controlled valve, after waiting for the duration of liquid rotating shift time threshold value T2, performs step b6).
B6) controller controls to cut out transfer electrically-controlled valve, open into water electrically-controlled valve, and read the output signal of the data output end of liquid level sensor and turbidity transducer, after the turbidimetry data that the data output end reading turbidity transducer transmits, controller controls display screen and shows turbidimetry data, and controls to open draining electrically-controlled valve, starts timing to water discharge time, and when the data output end output liquid level reading liquid level sensor puts signal in place, perform step b7).
B7) controller controls to cut out water inlet electrically-controlled valve, after waiting for the duration of froth breaking time of repose threshold value T1, judges the duration now whether timing of water discharge time having been reached to water discharge time threshold value T3; If reach, then redirect performs step b5); If do not reach, then continue to wait for, until when reaching the duration of water discharge time threshold value T3 to the timing of water discharge time, redirect performs step b5).
Can see, in the above-mentioned Survey control process of two-chamber flow cell turbidimetry system of the present invention, each measuring process is still divided into defoaming treatment and two stages of measurement processing, but unlike, in complete defoaming treatment, complete to measurement cavity transfer testing liquid, after transfer closed electromagnetic valve, this time measuring process measure the measurement processing in cavity with on once the defoaming treatment of measuring process in froth breaking cavity will run simultaneously and perform, just liquid is discharged immediately after measurement processing this time in measuring process completes, wait-receiving mode next time measuring process completes the testing liquid after defoaming treatment, and controller is when controlling from froth breaking cavity to measurement cavity transfer liquid, whether the timing that also can confirm to measure cavity water discharge time has reached the duration of T3, just control to close draining electrically-controlled valve after confirmation draining reaches T3 duration, open transfer electrically-controlled valve, to measurement cavity transfer liquid, control to ensure to measure in cavity that the liquid completing measurement is drained just enters new testing liquid afterwards by enough clean-up times, avoid because situation causes discharge opeing to postpone (such as because some reason makes extend the detection time of turbidity transducer beyond some, controller reads the time retardation of the turbidimetry data that turbidity transducer exports, cause and start discharge opeing process and postpone to some extent) and the liquid that causes measuring cavity is not yet drained time be just mixed into new testing liquid, follow-up measurement accuracy is had an impact, and so forth.Simultaneously, also can see, in the Survey control flow process that this improves, first controller controls after starting Survey control to cut out transfer electrically-controlled valve, open into water electrically-controlled valve and draining electrically-controlled valve (i.e. step b2), its objective is and allow while the retaining of froth breaking cavity, allow and measure cavity maintenance hull-borne, avoid measuring in cavity the impact (because before measuring first, may make to remain the liquid do not discharged in measurement cavity because the reasons such as measurement midway power failure surprisingly stop because of misoperation before this or system) remaining remaining water and measurement is caused as far as possible.Thus, just both measurement processing interval in the defoaming treatment in froth breaking cavity and measurement cavity is made alternately to be able to executed in parallel, save Measuring Time better, also farthest make use of the dual chamber advantage of system, while guaranteeing good measurement accuracy, improve the ageing of systematic survey further.With regard to specific implementation, in this Survey control flow process, the value requirement of presetting froth breaking time of repose threshold value T1, liquid rotating shift time threshold value T2 and water discharge time threshold value T3, consistent with aforesaid Survey control flow process.
In addition, can be seen by above-mentioned two Survey control processes, two-chamber flow cell turbidimetry system of the present invention is when carrying out turbidimetry, rely on liquid level sensor and water inlet electrically-controlled valve to control amount of inlet water, not by intake pressure influence of fluctuations, therefore, it is possible to adapt to the Test Application environment that various different hydraulic pressure or water pressure fluctuations change greatly well.In the step 1 of above-mentioned two Survey control processes, after controller reads presetting froth breaking time of repose threshold value T1, liquid rotating shift time threshold value T2 and water discharge time threshold value T3, in execution step 2) before, execution following steps can also be increased:
1s) controller controls to cut out water inlet electrically-controlled valve, opens transfer electrically-controlled valve and draining electrically-controlled valve, and after waiting for the duration of liquid rotating shift time threshold value T2, then perform step 2).
The object of this step, in order to before carrying out concrete measurement operation steps, first perform this forced-ventilated step, allow froth breaking cavity and measure in cavity the remaining water that may remain and discharge (such as unexpected power-off interruption in previous measuring process, then restart after measuring and just may remain Yu Shui in froth breaking cavity, measurement cavity), avoid it to affect follow-up measuring process.
Two-chamber flow cell turbidimetry system of the present invention, because it possesses the structural advantage of two-chamber flow cell, except carrying out except turbidimetry, self-cleaning control can also be realized, two-chamber flow cell is cleaned, to reduce the situation because the accuracy of dirt to turbidimetry deposited in two-chamber flow cell has an impact, lower false drop rate, improve measurement accuracy.When two-chamber flow cell turbidimetry system of the present invention carries out self-cleaning operation to testing liquid, the inlet channel of two-chamber flow cell turbidimetry system is needed to be connected to cleaning water source, and controller is set starts self-cleaning control, the self-cleaning control procedure of two-chamber flow cell turbidimetry system after this just can be automatically performed by controller; Its self-cleaning control procedure can perform as follows:
C1) when controller starts self-cleaning control, read presetting water discharge time threshold value T3 and scavenging period threshold value T4, then perform step c2).
C2) controller controls to open into water electrically-controlled valve, transfer electrically-controlled valve and draining electrically-controlled valve, and starts to carry out timing to scavenging period.
C3) controller is in the process of carrying out scavenging period timing, read the output signal of liquid level sensor data output end, if scavenging period timing not yet arrives the duration of scavenging period threshold value T4, the signal but the data output end output liquid level reading liquid level sensor puts in place, then perform step c4 immediately); If scavenging period timing arrives the duration of scavenging period threshold value T4, then redirect performs step c7).
C4) controller controls to cut out water inlet electrically-controlled valve, and postpones 1 ~ 3 second, then performs step c5);
C5) judge whether the scavenging period timing of current time arrives the duration of scavenging period threshold value T4, if then perform step c7), otherwise perform step c6);
C6) control to open into water electrically-controlled valve, redirect performs step c3);
C7) controller controls to cut out water inlet electrically-controlled valve, and after waiting for the duration of water discharge time threshold value T3, then control to close transfer electrically-controlled valve and draining electrically-controlled valve, self-cleaning control procedure completes.
Can see, in the above-mentioned self-cleaning control procedure of two-chamber flow cell turbidimetry system of the present invention, control to open into water electrically-controlled valve by controller, transfer electrically-controlled valve and draining electrically-controlled valve, allow cleaning liquid once flow into froth breaking cavity and measure cavity and clean, and directly discharge from drainage pipeline, take away and may be deposited on froth breaking cavity and measure dirt in cavity, and, also the moment controls the inflow of cleaning fluid to self-cleaning process middle controller according to the signal of liquid level sensor, when the data output end output liquid level reading liquid level sensor puts signal in place, showing in froth breaking cavity may because cleaning liquid transfer or drain age velocity is slow etc. that reason defines accumulation, exceed froth breaking cavity volume in order to avoid cleaning fluid and cause system failure, controller just controls cut out water inlet electrically-controlled valve and postpone 1 ~ 3 second, wait for that in froth breaking cavity, liquid flows out a period of time, after postponing to return, if scavenging period not yet terminates, open and continue cleaning process into water electrically-controlled valve, until scavenging period timing closes water inlet electrically-controlled valve after reaching T4 duration, perform discharge opeing process, if scavenging period is along with postponing also to terminate in the lump after postponing to return, then directly redirect performs discharge opeing process, discharge opeing process lasts T3 duration, to ensure that in two-chamber flow cell, cleaning fluid is emptying, finally controls water inlet electrically-controlled valve, transfer electrically-controlled valve and draining electrically-controlled valve Close All, reduces extraneous contamination.When concrete this self-cleaning control flow of enforcement, the value of water discharge time threshold value T3 requires consistent with aforesaid Survey control flow process, and scavenging period threshold value T4 then needs to come comprehensively to be determined according to the volume of two-chamber flow cell in embody rule situation and the cleaning performance of experience acquisition by experiment.
Adopt above-mentioned self-cleaning control procedure, can effectively rinse and discharge the dirt deposited in two-chamber flow cell, but lacked the process that cleaning fluid accumulates in froth breaking cavity and measurement cavity, therefore froth breaking cavity may be difficult to be cleaned with the dirt of higher level position attachment on the sidewall of measurement cavity.Be directed to this situation, can better be cleaned to make each position in two-chamber flow cell, the present invention also provides another kind of self-cleaning control flow, the inlet channel of two-chamber flow cell turbidimetry system is connected to cleaning water source, and arrange after controller starts self-cleaning control, performed as follows by controller:
D1) when controller starts self-cleaning control, read presetting water discharge time threshold value T3 and scavenging period threshold value T4, then perform steps d 2);
D2) controller controls to open into water electrically-controlled valve and transfer electrically-controlled valve, closes draining electrically-controlled valve, and starts to carry out timing to scavenging period;
D3) controller is in the process of carrying out scavenging period timing, read the output signal of liquid level sensor data output end, if scavenging period timing not yet arrives the duration of scavenging period threshold value T4, the signal but the data output end output liquid level reading liquid level sensor puts in place, then perform steps d 4 immediately); If scavenging period timing arrives the duration of scavenging period threshold value T4, then redirect performs steps d 9);
D4) controller controls to cut out water inlet electrically-controlled valve;
D5) postpone wait 1 ~ 3 second, then perform steps d 6);
D6) judge whether the scavenging period timing of current time arrives the duration of scavenging period threshold value T4, if then perform step 9), otherwise perform steps d 7);
D7) controller judges that data output end that whether current time still reads liquid level sensor exports liquid level and to put in place signal; If so, then redirect performs steps d 5); Otherwise, perform steps d 8);
D8) control to open into water electrically-controlled valve, redirect performs steps d 3);
D9) controller controls to cut out water inlet electrically-controlled valve, opens draining electrically-controlled valve, and after waiting for the duration of water discharge time threshold value T3, then control to close transfer electrically-controlled valve and draining electrically-controlled valve, self-cleaning control procedure completes.
In this self-cleaning control flow, controller in cleaning process by drain shut valve, cleaning fluid can be accumulated in froth breaking cavity and measurement cavity, make the dirt of higher level position attachment on the sidewall of froth breaking cavity and measurement cavity also can obtain cleaning to remove, and the data output end output liquid level reading liquid level sensor in cleaning process puts in place during signal, the mode also postponing to wait for by closing water inlet electrically-controlled valve equally controls the inflow of cleaning fluid, cleaning fluid is avoided to exceed froth breaking cavity volume and cause the situation of system failure to occur, and the cleaning fluid water level measuring chamber cylinder accumulation exceed presetting measurement height of water level position can automatically discharge from gap, without the need to independent control, after scavenging period timing arrives T4 duration, redirect performs discharge opeing process, and discharge opeing process lasts T3 duration, to ensure that in two-chamber flow cell, cleaning fluid is emptying, finally controls water inlet electrically-controlled valve, transfer electrically-controlled valve and draining electrically-controlled valve Close All, reduces extraneous contamination.When concrete this self-cleaning control flow of enforcement, the value of water discharge time threshold value T3 requires consistent with aforesaid Survey control flow process, scavenging period threshold value T4 then needs to come comprehensively to be determined according to the volume of two-chamber flow cell in embody rule situation and the cleaning performance of experience acquisition by experiment, and the amount that the duration of T4 preferably can flow into cleaning fluid in guaranty period two-chamber flow cell at least can allow froth breaking cavity and the liquid level measured in cavity reach presetting froth breaking height of water level position and presetting measurement height of water level position respectively, to ensure that cleaning fluid cleans to each corner.
Two kinds of above-mentioned self-cleaning control flows, have different advantages separately, can the application demand of basis, select to adopt different self-cleaning control modes to clean two-chamber flow cell turbidimetry system.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.

Claims (9)

1. a two-chamber flow cell turbidimetry system, is characterized in that, comprises turbidity transducer, controller and two-chamber flow cell, and described two-chamber flow cell comprises froth breaking cavity and measures cavity;
The top of described froth breaking cavity is provided with vent port; Sidewall in froth breaking cavity is positioned at presetting froth breaking height of water level position and is provided with liquid level sensor, the sidewall of froth breaking cavity is connected with inlet channel higher than liquid level sensor height and position place, and described inlet channel is provided with into water electrically-controlled valve; The bottom of froth breaking cavity is connected with measurement cavity by connecting tube, and described connecting tube is provided with transfer electrically-controlled valve;
The tip position height of described measurement cavity is not higher than the height of froth breaking cavity bottom its lowest position, and connecting tube is connected with measurement cavity, position is positioned at the bottom measuring cavity wall; The sidewall of measurement cavity is positioned at presetting measurement height of water level position and is provided with gap, the detection probe of described turbidity transducer stretches into be measured in cavity, and the position height of the detection probe of turbidity transducer in measurement cavity is lower than gap position height; The bottom measuring cavity is also connected with drainage pipeline, and described drainage pipeline is provided with draining electrically-controlled valve;
The liquid level data collection terminal of described controller and turbidity data collection terminal carry out electric signal with the data output end of liquid level sensor and turbidity transducer respectively and are connected; The water intaking valve control output end of controller, transfer valve control output end and draining valve control output end are carried out electric signal with water inlet electrically-controlled valve, the electric control end that shifts electrically-controlled valve and draining electrically-controlled valve respectively and are connected; The data display translation end of controller carries out electric signal with the display input end of display screen and is connected.
2. two-chamber flow cell turbidimetry system according to claim 1, is characterized in that, described froth breaking cavity entirety is in flat, and the bottom of froth breaking cavity is funnel-form, and its lowest position of its bottom funnel-shaped portion is connected with connecting tube.
3. two-chamber flow cell turbidimetry system according to claim 1, is characterized in that, the bottom of described measurement cavity is funnel-form, and its lowest position of its bottom funnel-shaped portion is connected with drainage pipeline.
4. two-chamber flow cell turbidimetry system according to claim 1, it is characterized in that, the water capacity that in described froth breaking cavity, presetting froth breaking height of water level position is corresponding is more than or equal to measures the water capacity that in cavity, presetting measurement height of water level position is corresponding.
5. the Survey control method of two-chamber flow cell turbidimetry system as claimed in claim 1, it is characterized in that, the inlet channel of two-chamber flow cell turbidimetry system is connected to water source to be measured, and controller startup Survey control is set, the Survey control of two-chamber flow cell turbidimetry system is performed as follows by controller:
1), when controller starts Survey control, presetting froth breaking time of repose threshold value T1, liquid rotating shift time threshold value T2 and water discharge time threshold value T3 is read; Then, step 2 is performed);
2) controller controls to cut out transfer electrically-controlled valve and draining electrically-controlled valve, opens into water electrically-controlled valve;
3) controller reads the output signal of liquid level sensor data output end, when the data output end output liquid level reading liquid level sensor puts signal in place, performs step 4);
4) controller controls to cut out water inlet electrically-controlled valve, after waiting for the duration of froth breaking time of repose threshold value T1, performs step 5);
5) controller controls to open transfer electrically-controlled valve, after waiting for the duration of liquid rotating shift time threshold value T2, performs step 6);
6) controller controls to cut out transfer electrically-controlled valve, read the output signal of turbidity transducer data output end, after the turbidimetry data that the data output end reading turbidity transducer transmits, controller controls display screen and shows turbidimetry data, and control to open draining electrically-controlled valve, after waiting for the duration of water discharge time threshold value T3, perform step 7);
7) controller controls to cut out draining electrically-controlled valve, opens into water electrically-controlled valve, and then redirect performs step 3).
6. the Survey control method of two-chamber flow cell turbidimetry system as claimed in claim 1, it is characterized in that, the inlet channel of two-chamber flow cell turbidimetry system is connected to water source to be measured, and controller startup Survey control is set, the Survey control of two-chamber flow cell turbidimetry system is performed as follows by controller:
1), when controller starts Survey control, presetting froth breaking time of repose threshold value T1, liquid rotating shift time threshold value T2 and water discharge time threshold value T3 is read; Then, step 2 is performed);
2) controller controls to cut out transfer electrically-controlled valve, opens into water electrically-controlled valve and draining electrically-controlled valve;
3) controller reads the output signal of liquid level sensor data output end, when the data output end output liquid level reading liquid level sensor puts signal in place, performs step 4);
4) controller controls to cut out water inlet electrically-controlled valve, after waiting for the duration of froth breaking time of repose threshold value T1, performs step 5);
5) controller controls to cut out draining electrically-controlled valve, opens transfer electrically-controlled valve, after waiting for the duration of liquid rotating shift time threshold value T2, performs step 6);
6) controller controls to cut out transfer electrically-controlled valve, open into water electrically-controlled valve, and read the output signal of the data output end of liquid level sensor and turbidity transducer, after the turbidimetry data that the data output end reading turbidity transducer transmits, controller controls display screen and shows turbidimetry data, and controls to open draining electrically-controlled valve, starts timing to water discharge time, and when the data output end output liquid level reading liquid level sensor puts signal in place, perform step 7);
7) controller controls to cut out water inlet electrically-controlled valve, after waiting for the duration of froth breaking time of repose threshold value T1, judges the duration now whether timing of water discharge time having been reached to water discharge time threshold value T3; If reach, then redirect performs step 5); If do not reach, then continue to wait for, until when reaching the duration of water discharge time threshold value T3 to the timing of water discharge time, redirect performs step 5).
7. the Survey control method of two-chamber flow cell turbidimetry system according to claim 6, it is characterized in that, in step 1, after controller reads presetting froth breaking time of repose threshold value T1, liquid rotating shift time threshold value T2 and water discharge time threshold value T3, in execution step 2) before, also perform following steps:
1s) controller controls to cut out water inlet electrically-controlled valve, opens transfer electrically-controlled valve and draining electrically-controlled valve, and after waiting for the duration of liquid rotating shift time threshold value T2, then perform step 2).
8. the self-cleaning control method of two-chamber flow cell turbidimetry system as claimed in claim 1, it is characterized in that, the inlet channel of two-chamber flow cell turbidimetry system is connected to cleaning water source, and controller is set starts self-cleaning control, the self-cleaning control of two-chamber flow cell turbidimetry system is performed as follows by controller:
1) when controller starts self-cleaning control, read presetting water discharge time threshold value T3 and scavenging period threshold value T4, then perform step 2);
2) controller controls to open into water electrically-controlled valve, transfer electrically-controlled valve and draining electrically-controlled valve, and starts to carry out timing to scavenging period;
3) controller is in the process of carrying out scavenging period timing, read the output signal of liquid level sensor data output end, if scavenging period timing not yet arrives the duration of scavenging period threshold value T4, the signal but the data output end output liquid level reading liquid level sensor puts in place, then perform step 4) immediately; If scavenging period timing arrives the duration of scavenging period threshold value T4, then redirect performs step 7);
4) controller controls to cut out water inlet electrically-controlled valve, and postpones 1 ~ 3 second, then performs step 5);
5) judge whether the scavenging period timing of current time arrives the duration of scavenging period threshold value T4, if then perform step 7), otherwise perform step 6);
6) control to open into water electrically-controlled valve, redirect performs step 3);
7) controller controls to cut out water inlet electrically-controlled valve, and after waiting for the duration of water discharge time threshold value T3, then control to close transfer electrically-controlled valve and draining electrically-controlled valve, self-cleaning control procedure completes.
9. the self-cleaning control method of two-chamber flow cell turbidimetry system as claimed in claim 1, it is characterized in that, the inlet channel of two-chamber flow cell turbidimetry system is connected to cleaning water source, and controller is set starts self-cleaning control, the self-cleaning control of two-chamber flow cell turbidimetry system is performed as follows by controller:
1) when controller starts self-cleaning control, read presetting water discharge time threshold value T3 and scavenging period threshold value T4, then perform step 2);
2) controller controls to open into water electrically-controlled valve and transfer electrically-controlled valve, closes draining electrically-controlled valve, and starts to carry out timing to scavenging period;
3) controller is in the process of carrying out scavenging period timing, read the output signal of liquid level sensor data output end, if scavenging period timing not yet arrives the duration of scavenging period threshold value T4, the signal but the data output end output liquid level reading liquid level sensor puts in place, then perform step 4) immediately; If scavenging period timing arrives the duration of scavenging period threshold value T4, then redirect performs step 9);
4) controller controls to cut out water inlet electrically-controlled valve;
5) postpone wait 1 ~ 3 second, then perform step 6);
6) judge whether the scavenging period timing of current time arrives the duration of scavenging period threshold value T4, if then perform step 9), otherwise perform step 7);
7) controller judges that data output end that whether current time still reads liquid level sensor exports liquid level and to put in place signal; If so, then redirect performs step 5); Otherwise, perform step 8);
8) control to open into water electrically-controlled valve, redirect performs step 3);
9) controller controls to cut out water inlet electrically-controlled valve, opens draining electrically-controlled valve, and after waiting for the duration of water discharge time threshold value T3, then control to close transfer electrically-controlled valve and draining electrically-controlled valve, self-cleaning control procedure completes.
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