CN105699372B - A kind of method of testing based on water-soluble soda acid test device - Google Patents

Abstract

The present invention provides a test method based on a water-soluble acid-base test device. In the test device, the bottom end of the extraction vessel communicates with the funnel through a first liquid inlet pipe. A first flowmeter and a first solenoid valve are arranged on the top; the indicator bottle communicates with the funnel through a second liquid inlet pipe, and a second flowmeter and a second electromagnetic valve are arranged on the second liquid inlet pipe. valve. The test device of the present invention enables the lower extraction phase and the indicator to continuously fall into the funnel under the action of their respective gravity through the above arrangement, so as to be evenly mixed at the bottom of the funnel. The test device of the present invention overcomes the defects that the existing water-soluble acid-base test device requires many components and is difficult to assemble, and has the characteristics of simple structure and convenient use and maintenance. The test method of the invention can realize the instant detection of water-soluble acid and alkali, and the determination result has high accuracy and precision.

Description

A kind of test method based on water-soluble acid-base test device

technical field

The invention relates to an acid-base test method, in particular to a method capable of automatically detecting the water-soluble acid-base content in oil products, and belongs to the technical field of test methods.

technical background

The water-soluble acids and bases of petroleum products are mostly water-soluble mineral acids or bases formed from uncleaned residues in the acid-base refining process of petroleum fractions. Among them, the mineral acids are mainly sulfuric acid and its derivatives. Including sulfonic acid and acidic sulfate ester, the mineral bases are mainly caustic soda and sodium carbonate. During the production, use or storage of oil products, these water-soluble acids and bases will corrode the metal components in contact with them on the one hand, and the water-soluble alkalis will only corrode aluminum. However, water-soluble acid has a strong corrosive effect on almost all metals, such as the increase of water-soluble acid value in transformer oil will make solid insulating materials and metal Corrosion will occur, reduce the insulation performance of electrical equipment, and shorten the service life of the equipment; on the other hand, the water-soluble acid and alkali contained in the oil will cause the oil to deteriorate under the interaction of moisture and oxygen in the atmosphere and under the condition of heat. Oxidation, gelling, aging and decomposition. Therefore, strengthening the detection of water-soluble acids and bases is of great significance for maintaining the healthy and stable operation of equipment.

At present, the method used to determine water-soluble acids in oil for electric power is artificial visual colorimetry, and its specific steps are: mix equal volumes of distilled water and oil samples, heat and oscillate, stand to separate and separate, and collect the lower aqueous phase , after adding bromocresol green or bromocresol purple indicator, transfer it to a cuvette, and perform manual visual color comparison with the pre-prepared pH standard color scale containing bromocresol green or bromocresol purple, or use The Hailiqi colorimeter performs manual visual color comparison to judge the pH value. The manual visual colorimetry method has the following defects: (1) The entire measurement process is complicated and involves steps such as heating, oscillation, temperature measurement, sampling, liquid drainage, color development, and colorimetry, and the manual operation is inefficient and time-consuming ; (2) The pre-prepared standard color scale will gradually change color or produce flocculent precipitation due to the influence of the natural environment, which will affect the colorimetric results and cause systematic errors; (3) The difference in color judgment by human eyes will inevitably cause subjective error.

In order to solve the above-mentioned defects in the artificial visual colorimetry, Chinese patent document CN101614674A discloses a fully automatic water-soluble acid measuring instrument, which includes a test cup, a test tube, a cleaning agent bottle, a distilled water bottle, a sample bottle, a vacuum pump, a waste liquid bottle, indicator bottle, the test cup is provided with a heater and a temperature sensor, and the mouth of the test cup is respectively connected with a cleaning agent bottle, a distilled water bottle, a sample bottle, and a vacuum pump through a delivery pipeline. The port is connected with the indicator bottle and the test cup through the delivery pipeline, and the bottom of the test cup and the test tube are connected with the waste liquid bottle through the delivery pipeline. Although the above-mentioned technology has improved to a certain extent the accuracy of the measurement efficiency and measurement results of water-soluble acids in oil products, because the measuring instrument described in this technology is processed and assembled from existing glassware, the required There are many components and it is not easy to assemble, which makes it difficult to use and maintain the above-mentioned measuring instrument, and cannot realize instant detection. Therefore, it is an unresolved technical problem in the art to research and develop a water-soluble acid-base testing device that is simple in structure, easy to use and maintain, and capable of instant detection.

Contents of the invention

The invention solves the problem that the water-soluble acid-base detector in the prior art is difficult to use and maintain and cannot realize real-time detection due to the many components required and the difficulty in assembly, and further provides a simple structure and convenient use and maintenance. , A water-soluble acid-base testing device and testing method capable of immediate detection.

The technical scheme that the present invention realizes above-mentioned purpose is:

A test method based on a water-soluble acid-base testing device, the water-soluble acid-base testing device comprising:

The extraction container is used to extract the water-soluble acid or alkali in the oil sample. The bottom end of the extraction container is communicated with a first liquid inlet pipe, and a first flow meter and a second liquid inlet pipe are arranged on the first liquid inlet pipe. A solenoid valve; an oscillator is connected to the extraction container, and both the extraction container and the oscillator are located inside the thermostat, and a temperature measuring device is also arranged in the thermostat;

An indicator bottle, which contains an indicator, and a second liquid inlet pipe is connected to the bottom end of the indicator bottle, and a second flowmeter and a second solenoid valve are arranged on the second liquid inlet pipe;

A funnel is arranged below the extraction container and the indicator bottle, the funnel communicates with the extraction container through the first liquid inlet pipe, and the funnel communicates with the extraction container through the second liquid inlet pipe. The indicator bottle is connected, and the funnel is suitable for mixing the water-soluble acid or alkali with the indicator to form a test solution;

A photoelectric colorimetric mechanism, including a cuvette, the cuvette is arranged below the funnel for receiving the liquid to be tested;

A cleaning solution bottle, the cleaning solution bottle communicates with the cuvette through a third liquid inlet pipe, and a third electromagnetic valve is arranged on the third liquid inlet pipe;

A vacuum pump communicates with the bottom end of the cuvette through a liquid discharge pipe, and a liquid discharge solenoid valve is arranged on the liquid discharge pipe;

A control unit, the control unit is used to control the actions of the oscillator, the first solenoid valve, the second solenoid valve, the third solenoid valve and the vacuum pump; the control unit is suitable for receiving the temperature information and the flow information transmitted by the first flow meter and the second flow meter, and control the flow of the first solenoid valve and the second solenoid valve according to the flow information, and control the thermostat box according to the temperature information temperature and the start timing of the oscillator;

Described test method comprises the steps:

(1) In the initial state, control the first solenoid valve, the second solenoid valve, the third solenoid valve and the liquid discharge solenoid valve to be closed; add the indicator to the indicator bottle, A mixture of distilled water and oil sample is added to the extraction container, and when the temperature in the incubator reaches a first temperature threshold, the oscillator is used to oscillate the extraction container;

(2) After the oscillation is completed, the incubator is cooled down. When the temperature in the incubator reaches the second temperature threshold, the first electromagnetic valve and the second electromagnetic valve are opened, and the lower layer of the mixed solution is extracted. While the phase flows into the funnel at the first flow rate, the indicator flows into the funnel at the second flow rate to obtain the liquid to be tested; wherein the first flow rate is 40-50 times the second flow rate;

(3) The liquid to be tested enters the cuvette to rinse the cuvette, and the step of rinsing is: open the drain solenoid valve and the vacuum pump, and put the liquid into the cuvette in the early stage into the cuvette. The liquid to be tested in the dish is discharged, and then the drain solenoid valve and the vacuum pump are closed; the photoelectric colorimetric mechanism performs colorimetry on the liquid to be tested that enters the cuvette later;

(4) After the colorimetry ends, open the liquid discharge solenoid valve and vacuum pump to discharge the waste liquid after the colorimetry is completed; open the third solenoid valve, and the cleaning solution in the cleaning bottle flows into the cuvette And finally discharged by the drain pipe, thus completing the cleaning process.

In step (1), the first temperature threshold is 50-70° C., the oscillation time is 4-8 minutes; the second temperature threshold is room temperature.

In step (1), the indicator is bromocresol purple or bromothymol blue.

The volume ratio of the distilled water to the oil sample is 1:1.

In the water-soluble acid-base testing device of the present invention, the first solenoid valve, the second solenoid valve and the third solenoid valve are normally closed solenoid valves, and the drain solenoid valve is a normally open solenoid valve; the indication There are two reagent bottles, each of the indicator bottles communicates with the funnel through a separate second liquid inlet pipe, and a second flow meter and a second flowmeter are installed on each of the second liquid inlet pipes. A second solenoid valve; a stirring device is arranged in the funnel; a waste liquid recovery bottle is arranged on the drain pipe between the vacuum pump and the drain solenoid valve.

In the test method based on the water-soluble acid-base testing device of the present invention, step (2) defines that while the lower extract phase of the mixed solution flows into the funnel with a first flow rate, the indicator flows into the funnel with a second flow rate. Described funnel, and limit described first flow rate to be 40-50 times of described second flow rate, described lower layer extraction phase flows in described funnel simultaneously with described indicator so as to obtain liquid to be tested; Its reason is to make lower layer The extract phase and the indicator fall into the funnel continuously under the action of their own gravity, and because the volume of the lower extract phase and the indicator entering the funnel at the same time is very small, the two can be mixed evenly when they merge at the bottom of the funnel , so that all the lower extraction phase falling into the funnel can be mixed with the indicator evenly to obtain the test solution, and the flow rate of the lower extraction phase is controlled to be 40-50 times the flow rate of the indicator, so that the lower extraction phase in the test solution The volume of the phase is 40-50 times the volume of the indicator, so as to reduce the measurement error as much as possible under the premise of ensuring the color sensitivity of the indicator. In the determination method of the present invention, in step (3), a photoelectric colorimetric mechanism is used to carry out photoelectric colorimetric measurement of the liquid to be tested in the described cuvette, so that not only the measurement results can be obtained quickly, but also suitable for oil products. The rapid detection of water-soluble acids and bases can also effectively overcome the errors of naked eye observation and greatly improve the accuracy and precision of the measurement results. In the assay method of the present invention, after the colorimetry is defined in step (4), the liquid discharge solenoid valve and the vacuum pump are opened to discharge the waste liquid after the colorimetry is completed; then the third solenoid valve is opened, and the The cleaning solution in the cleaning bottle flows into the cuvette and is finally discharged by the drain pipe, thereby completing the cleaning process; the purpose of the cleaning process after the measurement of the present invention is to realize the removal of water-soluble acid in the oil on the one hand. Real-time detection of alkali, on the other hand, ensures the cleanliness of the cuvette, avoiding the waste liquid staying in the cuvette for a long time may introduce impurities into the subsequent determination, so as to ensure the accuracy of the measurement results.

Compared with the water-soluble acid-base test device in the prior art, the water-soluble acid-base test device of the present invention has the following advantages:

(1) The water-soluble acid-base testing device of the present invention includes an extraction container, an indicator bottle, a funnel, a photoelectric colorimetric mechanism, a cleaning solution bottle and a vacuum pump, and the bottom end of the extraction container is defined to communicate with a first The liquid inlet pipe is provided with a first flow meter and a first electromagnetic valve on the first liquid inlet pipe; a second liquid inlet pipe is provided in communication with the bottom end of the indicator bottle, and a second liquid inlet pipe is arranged on the second liquid inlet pipe. A second flow meter and a second solenoid valve are arranged on the tube; the funnel is located below the extraction container and the indicator bottle, and the funnel communicates with the extraction container through the first liquid inlet pipe, And communicate with the indicator bottle through the second liquid inlet pipe. The test device of the present invention makes the lower layer extract phase and the indicator can continuously fall into the funnel respectively under the effect of respective gravity through the above-mentioned setting, because the volume of the lower layer extract phase and the indicator entering in the funnel at the same time is all very small, both When the bottom of the funnel is fused, it can be mixed evenly, so that the lower extract phase and the indicator that all fall into the funnel can be mixed evenly, so as to obtain the liquid to be tested. It can be seen that the test device of the present invention overcomes the defects that the existing water-soluble acid-base test device requires many components and is difficult to assemble, and has the characteristics of simple structure, easy use and maintenance.

(2) The water-soluble acid-base testing device of the present invention controls the actions of the oscillator, the first solenoid valve, the second solenoid valve, the third solenoid valve and the vacuum pump by using a control unit, and the control The unit is adapted to receive the temperature information transmitted by the temperature measuring device and the flow information transmitted by the first flow meter and the second flow meter, and control the flow of the first solenoid valve and the second solenoid valve according to the flow information , according to the temperature information to control the temperature of the incubator and the opening timing of the oscillator; thus, the test device of the present invention not only saves complicated manual operation steps, but also effectively avoids systematic errors and subjective errors caused by manual measurement. It is beneficial to realize the rapid and real-time determination of water-soluble acid and alkali in oil products, which greatly improves the work efficiency and the accuracy of the determination results.

In addition, the water-soluble acid-base testing device of the present invention further defines that there are two indicator bottles, and each of the indicator bottles is connected to the funnel through a separate second liquid inlet pipe. The second flow meter and the second solenoid valve are installed on the second liquid inlet pipe; the advantage of such arrangement is that the lower extraction phase obtained by the vibration extraction of the present invention can be mixed with the acid or alkali indicator respectively, and then Through colorimetric measurement, not only the water-soluble acid value of the oil product can be obtained, but also the water-soluble alkali value can be obtained. The effect of the water-soluble acid or alkali content is determined.

Description of drawings

Fig. 1 is the structural representation of water-soluble acid-base testing device of the present invention;

Among them, the reference signs are as follows:

1-extraction container; 2-first liquid inlet pipe; 3-first flow meter; 4-first solenoid valve; 5-incubator; 6-indicator bottle; 7-second liquid inlet pipe; 8-second Flowmeter; 9-Second solenoid valve; 10-Funnel; 11-Photoelectric colorimetric mechanism; 12-Cuvette; 13-Cleaning liquid bottle; 14-Third inlet pipe; 15-Third solenoid valve; Vacuum pump; 17-drain pipe; 18-drain solenoid valve; 19-waste liquid recovery bottle.

Detailed ways

The water-soluble acid-base testing device and testing method provided by the present invention will be described in detail below in conjunction with specific examples.

Example 1

The water-soluble acid-base testing device described in the present embodiment, as shown in Figure 1, comprises:

The extraction container 1 is used to extract the water-soluble acid or alkali in the oil sample. The bottom end of the extraction container 1 is communicated with a first liquid inlet pipe 2, and a first liquid inlet pipe 2 is arranged on the first liquid inlet pipe 2. A flow meter 3 and a first electromagnetic valve 4; an oscillator is connected to the extraction container 1, and the extraction container 1 and the oscillator are both located inside the thermostat 5, and the thermostat 5 is also provided with temperature measuring device;

The indicator bottle 6 is filled with an indicator, and the bottom end of the indicator bottle 6 is communicated with a second liquid inlet pipe 7, and a second flow meter 8 and a second flow meter 8 are arranged on the second liquid inlet pipe 7. The second solenoid valve 9;

A funnel 10 is arranged below the extraction container 1 and the indicator bottle 6, the funnel 10 communicates with the extraction container 1 through the first liquid inlet pipe 2, and the funnel 10 passes through the first The second liquid inlet pipe 7 is in communication with the indicator bottle 6, and the funnel 10 is suitable for mixing the water-soluble acid or alkali with the indicator to form a liquid to be tested;

Photoelectric colorimetric mechanism 11, including cuvette 12, described cuvette 12 is arranged below the described funnel 10, is used to receive described liquid to be tested;

A cleaning liquid bottle 13, the cleaning liquid bottle 13 communicates with the cuvette 12 through a third liquid inlet pipe 14, and a third electromagnetic valve 15 is arranged on the third liquid inlet pipe 14;

The vacuum pump 16 communicates with the bottom end of the cuvette 12 through a liquid discharge pipe 17 , and a liquid discharge solenoid valve 18 is arranged on the liquid discharge pipe 17 .

In this embodiment, the first solenoid valve 4 , the second solenoid valve 9 and the third solenoid valve 15 are normally closed solenoid valves, and the drain solenoid valve 18 is a normally open solenoid valve.

The method for testing water-soluble acid based on the water-soluble acid-base testing device described in this implementation may further comprise the steps:

(1) In the initial state, control the first solenoid valve, the second solenoid valve, the third solenoid valve and the drain solenoid valve to be closed; add bromocresol purple indicator in the indicator bottle , adding an equal volume of a mixture of distilled water and oil sample to the extraction vessel, and when the temperature in the thermostat reaches 50°C, use the oscillator to vibrate the extraction vessel for 8 minutes;

(2) After the oscillation is completed, the incubator is cooled down, and when the temperature in the incubator reaches room temperature, the first solenoid valve and the second solenoid valve are opened, and the lower extract phase of the mixed solution is separated by the first When a flow rate flows into the funnel, the bromocresol purple indicator flows into the funnel at a second flow rate to obtain the test solution; wherein the first flow rate is 40 times that of the second flow rate;

(3) the liquid to be tested enters the cuvette, and the photoelectric colorimetric mechanism performs colorimetry on the liquid to be tested in the cuvette;

(4) After the colorimetry ends, open the liquid discharge solenoid valve and vacuum pump to discharge the waste liquid after the colorimetry is completed; open the third solenoid valve, the distilled water in the cleaning bottle flows into the cuvette and Finally, it is discharged from the drain pipe, thus completing the cleaning process.

Example 2

The water-soluble acid-base testing device described in the present embodiment, as shown in Figure 1, comprises:

The extraction container 1 is used to extract the water-soluble acid or alkali in the oil sample. The bottom end of the extraction container 1 is communicated with a first liquid inlet pipe 2, and a first liquid inlet pipe 2 is arranged on the first liquid inlet pipe 2. A flow meter 3 and a first electromagnetic valve 4; an oscillator is connected to the extraction container 1, and the extraction container 1 and the oscillator are both located inside the thermostat 5, and the thermostat 5 is also provided with temperature measuring device;

The indicator bottle 6 is filled with an indicator, and the bottom end of the indicator bottle 6 is communicated with a second liquid inlet pipe 7, and a second flow meter 8 and a second flow meter 8 are arranged on the second liquid inlet pipe 7. The second solenoid valve 9;

A funnel 10 is arranged below the extraction container 1 and the indicator bottle 6, the funnel 10 communicates with the extraction container 1 through the first liquid inlet pipe 2, and the funnel 10 passes through the first The second liquid inlet pipe 7 communicates with the indicator bottle 6, and a stirring device is arranged in the funnel 10. In this embodiment, the stirring device is a stirring bar, and the funnel 10 is suitable for mixing the water-soluble acid Or the base is mixed with the indicator to form a test solution;

Photoelectric colorimetric mechanism 11, including cuvette 12, described cuvette 12 is arranged below the described funnel 10, is used to receive described liquid to be tested;

A cleaning liquid bottle 13, the cleaning liquid bottle 13 communicates with the cuvette 12 through a third liquid inlet pipe 14, and a third electromagnetic valve 15 is arranged on the third liquid inlet pipe 14;

The vacuum pump 16 communicates with the bottom end of the cuvette 12 through a liquid discharge pipe 17, and a liquid discharge solenoid valve 18 is arranged on the liquid discharge pipe 17; A waste liquid recovery bottle 19 is arranged on the drain pipe 17 between 18;

a control unit for controlling the actions of the oscillator, the first solenoid valve 4, the second solenoid valve 9, the third solenoid valve 15 and the vacuum pump 16; the control unit is adapted to receive the temperature Measure the temperature information transmitted by the device and the flow information transmitted by the first flow meter 3 and the second flow meter 8, and control the flow of the first electromagnetic valve 4 and the second electromagnetic valve 9 according to the flow information, and according to the flow information The temperature information controls the temperature of the thermostat 5 and the start timing of the oscillator.

In this embodiment, the first solenoid valve 4 , the second solenoid valve 9 and the third solenoid valve 15 are normally closed solenoid valves, and the drain solenoid valve 18 is a normally open solenoid valve. There are two indicator bottles 6, and each indicator bottle 6 communicates with the funnel 10 through a separate second liquid inlet pipe 7, and on each second liquid inlet pipe 7 Both are equipped with a second flowmeter 8 and a second solenoid valve 9 .

The method for testing water-soluble alkali based on the water-soluble acid-base testing device described in this implementation may further comprise the steps:

(1) In the initial state, control the first solenoid valve, the second solenoid valve, the third solenoid valve and the drain solenoid valve to be closed; add bromothymol to one of the indicator bottles For the blue indicator, add an equal volume of distilled water and oil sample mixture into the extraction container, and when the temperature in the incubator reaches 70°C, use the oscillator to vibrate the extraction container for 4 minutes;

(2) After the oscillation is completed, the incubator is cooled down, and when the temperature in the incubator reaches room temperature, the first solenoid valve and the second solenoid valve are opened, and the lower extract phase of the mixed solution is separated by the first When a flow rate flows into the funnel, the bromothymol blue indicator flows into the funnel at a second flow rate, and after stirring, the test solution is obtained; wherein the first flow rate is 50% of the second flow rate. times;

(3) Send part of the liquid to be tested into the cuvette, open the drain solenoid valve and vacuum pump to discharge the part of the liquid to be tested; then close the drain solenoid valve and vacuum pump, and the other part of the liquid to be tested The liquid to be tested enters the cuvette after rinsing, and the photoelectric colorimetric mechanism performs colorimetry to the liquid to be tested in the cuvette after the rinsing;

(4) After the colorimetry ends, open the liquid discharge electromagnetic valve and the vacuum pump again, and discharge the waste liquid after the colorimetry to the waste liquid recovery bottle; open the third electromagnetic valve, and the distilled water in the cleaning bottle It flows into the cuvette and is finally discharged into the waste liquid recovery bottle through the drain pipe, thereby completing the cleaning process.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, on the basis of the above description, other changes or changes in different forms can also be made. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (4)

1. A kind of 1. method of testing based on water-soluble soda acid test device, it is characterised in that：

   The water-soluble soda acid test device includes：

   Extraction container (1), for extracting water soluble acid or alkali in oil sample, the bottom connection of the extraction container (1) is set There is the first feed tube (2), first flowmeter (3) and the first magnetic valve (4) are provided with first feed tube (2)；With institute State extraction container (1) and be connected with oscillator, the extraction container (1) and the oscillator are respectively positioned on the interior of insulating box (5) Portion, temperature measuring apparatus is additionally provided with the insulating box (5)；

   Indicator bottle (6), its is built-in to fill indicator, and the second feed tube is provided with and communicated with the bottom of the indicator bottle (6) (7) second flowmeter (8) and second solenoid valve (9), are provided with second feed tube (7)；

   Funnel (10), is arranged on the lower section of the extraction container (1) and the indicator bottle (6), and the funnel (10) passes through institute State the first feed tube (2) with the extraction container (1) to be connected, the funnel (10) passes through second feed tube (7) and institute State indicator bottle (6) to be connected, the water soluble acid or alkali are mixed to form prepare liquid by the funnel (10) with the indicator；

   Photoelectric colorimetry mechanism (11), including cuvette (12), the cuvette (12) are arranged on the lower section of the funnel (10), use In the reception prepare liquid；

   Cleaning fluid bottle (13), the cleaning fluid bottle (13) are connected by the 3rd feed tube (14) with the cuvette (12), The 3rd magnetic valve (15) is provided with 3rd feed tube (14)；

   Vavuum pump (16), it is connected by discharging tube (17) with the bottom of the cuvette (12), on the discharging tube (17) It is provided with draining solenoid valve (18)；

   Control unit, described control unit are used to control the oscillator, the first magnetic valve (4), second solenoid valve (9), the 3rd The action of magnetic valve (15) and the vavuum pump (16)；Described control unit receives the temperature letter of the temperature measuring apparatus transmission The flow information that breath and the first flowmeter (3) and second flowmeter (8) are transmitted, and institute is controlled according to the flow information The first magnetic valve (4) and the flow of second solenoid valve (9) are stated, the temperature of the insulating box (5) is controlled according to the temperature information And the unlatching opportunity of the oscillator；

   The method of testing comprises the following steps：

   (1) under original state, control first magnetic valve, second solenoid valve, the 3rd magnetic valve and the draining solenoid valve equal For closed mode；The indicator is added into the indicator bottle, distilled water and oil sample are added into the extraction container Mixed liquor, when the temperature in the insulating box reaches the first temperature threshold, the extraction container is entered using the oscillator Row vibration；

   (2) after the completion of vibrating, the insulating box carries out cooling down, when the temperature in the insulating box reaches second temperature threshold value When, first magnetic valve and second solenoid valve are opened, lower floor's extraction phase of the mixed liquor flows into the leakage with the first flow velocity While bucket, the indicator flows into the funnel so as to obtain prepare liquid with second flow speed；Wherein, first flow velocity is institute State second flow speed 40-50 times；

   (3) prepare liquid enters to carry out rinse to the cuvette in the cuvette, is the step of the rinse：Open The draining solenoid valve and vavuum pump, the prepare liquid that early stage is entered in the cuvette are discharged, and are then shut off the row Liquid electromagnetic valve and vavuum pump；The photoelectric colorimetry mechanism carries out colorimetric to the prepare liquid that the later stage enters in the cuvette；

   (4) after colorimetric terminates, the draining solenoid valve and vavuum pump are opened, the waste liquid after completion colorimetric is discharged；Described in unlatching 3rd magnetic valve, the cleaning fluid in the washer bottle flows into the cuvette and finally discharged by discharging tube, so as to complete to clean Process.
2. 2. method of testing according to claim 1, it is characterised in that in step (1), first temperature threshold is 50- 70 DEG C, the time of the vibration is 4-8min；The second temperature threshold value is room temperature.
3. 3. method of testing according to claim 1, it is characterised in that in step (1), the indicator be bromocresol purple or Bromthymol blue.
4. 4. according to the method for testing described in claim any one of 1-3, it is characterised in that the volume ratio of the distilled water and oil sample For 1：1.