CN220542898U - On-site diagnosis device for oilfield sewage treatment condition - Google Patents

Abstract

The utility model relates to a field diagnosis device for oilfield sewage treatment conditions, which comprises a test box, a light transmittance meter test element, an electrode unit and an electric appliance host unit, wherein the test box comprises a box body, a top cover and a plurality of glass test tubes, and is characterized in that a clamping seat for fixing the glass test tubes is arranged in the box body; the electrode unit comprises a plurality of groups of electrodes, and each group of electrodes is respectively inserted into the sample of the glass test tube and connected with the electric appliance host unit for testing the potential difference of the sample in the test tube. The device can detect two sewage indexes of light transmittance and potential difference, can realize on-site instant sampling, instant test and quick feedback for water quality evaluation.

Description

On-site diagnosis device for oilfield sewage treatment condition

Technical Field

The utility model relates to the technical field of oilfield produced water treatment and reuse, in particular to an on-site diagnosis device for oilfield sewage treatment conditions.

Background

The oilfield ground sewage treatment system is generally divided into three sections, wherein the first section is used for removing most of floating oil and part of emulsified oil crude oil in produced water by a physical and chemical means and mainly comprises a settling tank, an oil removal tank, a pressure oil remover, air floatation and other technical units; the second section further removes suspended solid particles in the sewage by a filtering means, and mainly comprises rough filtration, fine filtration, ultrafiltration and the like; the third section is a water injection unit, a stable water source is continuously provided for a water injection pump through a water injection tank, continuous and stable reinjection for 24 hours is realized, from experience of on-site long-term operation management, daily management is more important to pay attention to the front two treatment units of the sewage treatment system, production management of the water injection unit is ignored, and the lack of a rapid and accurate assessment and diagnosis device suitable for the on-site is an important reason. At present, the technical field of oilfield sewage treatment is focused on overall treatment water quality evaluation, the problems of unit diagnosis and main cause judgment are ignored, the cause is also related to the greater relationship between the qualitative diagnosis evaluation of the on-site sewage property and the change of 12 water quality monitoring and repeated management thinking, which is performed before, in the means of the prior art management, and the importance and the dependence on the water quality monitoring data taking 12 monitoring water quality indexes as oilfield levels are also ignored. The 12 water quality monitoring is far behind the actual oilfield sewage production management requirement due to the monitoring frequency and the data feedback speed, so that the actual detection and diagnosis capability of oilfield sewage treatment conditions are generally behind the actual production requirement. The sewage quality standard reaching rate of the prior oilfield sewage is difficult to continuously and stably improve.

Two kinds of evaluation and monitoring methods for the treatment of the oily sewage in the oil field are as follows.

In the prior art, the oil field mainly executes a water quality detection recommendation method represented by 'water quality index and analysis method of clastic rock oil reservoir', the current execution version is 2012 for replacing the previous 1994 and 1988 standards, and the current implementation has reached 11 years, and the recommended water quality monitoring data comprise 12 indexes of suspended solid content, suspended matter particle diameter median value, oil content, average corrosion rate, sulfate reducing bacteria, iron bacteria, saprophytic bacteria, total iron, hydrogen sulfide, dissolved oxygen, aggressive carbon dioxide and pH value. The method for measuring the suspended solid content is that a film test filter is utilized, a water sample passes through a filter membrane which is weighed to be constant in weight, and the suspended solid content in the water is calculated through the volume of the filtered water and the weight increment of the filter membrane; the single test item including filter preparation and water sample collection in the detection process generally takes about 48 hours for the whole test. The method for measuring the median particle diameter of the water sample is to measure the particle size of the water sample passing through a small pore tube by using a Coulter particle counter or a laser particle sizer, and the median value of particle size distribution of the water sample is measured by using a high-value instrument and a corresponding professional test place, and generally, a professional tester with a stronger test foundation is needed to finish the measurement. The method for measuring the oil content utilizes an ultraviolet spectrophotometer to measure the content of petroleum hydrocarbon in a water sample after solvent extraction, and utilizes the characteristic that the color depth of an extracting solution is in linear relation with the oil content concentration to realize the measurement of the content of petroleum hydrocarbon in the water sample, and the ultraviolet spectrophotometer with higher price is needed. Testing the average corrosion rate, namely installing a test piece in an on-site on-line test piece testing device, taking down the test piece after the on-site actual operation for 1-3 months, carrying out indoor treatment and weighing, and calculating the weight loss before and after the test piece hanging in a water injection system to calculate the average corrosion rate; the test time is long, the problem that a test piece cannot be taken out due to corrosion and scaling is often encountered, and the quantitative data of accurately implementing corrosion conditions cannot be obtained due to overlong feedback of test data. The method comprises the steps of testing three bacteria such as sulfate reducing bacteria, adopting a method of a test bottle, placing a water sample into the test bottle of the corresponding bacteria, culturing the water sample in a water sample temperature environment for 7-14 days by using a secondary or tertiary dilution method, and calculating the concentration of the bacteria according to the characteristic color change of a culture bottle; the test period is long, the influence factors are more, and the accuracy is lower. The measurement of dissolved oxygen, aggressive carbon dioxide, hydrogen sulfide, total iron and pH value is usually carried out by adopting a titration mode such as an iodometry and the like, and the measurement of the later three items such as hydrogen sulfide and the like can also be carried out by adopting a test tube mode, but the five test items such as the dissolved oxygen and the like only reflect the data characteristics of a certain aspect in a water sample, can not reflect the condition of 7 main control indexes of the solid content of suspended matters in the water sample, can not reflect the condition of the whole water quality, and has lower weight and weaker influence on the stability and the improvement of the water quality of the whole water injection of an oil field.

The method comprises the steps that 12 monitoring is carried out in an early oil field, a qualitative test method implemented by an operator of a basic management station is carried out at the same time, a test method for testing mechanical impurities and total iron content in sewage is carried out in a visual inspection mode, the two data are correlated with data such as suspended solid content and the like in a sewage water sample, the test method of the two items is specifically that standard solutions with different concentrations are prepared and placed in a colorimetric tube, and in actual test, the difference of color and turbidity of the water sample in the tube is tested in visual inspection mode, and the color sample is compared with the colorimetric tube water sample with different concentrations and standard chromaticity in the colorimetric tube, so that test data are obtained; however, the test result is completely dependent on the difference of visual water samples, and the concentration of the standard water sample is the step concentration, so that the test precision is lower, the measured data are estimated, and meanwhile, the test operator has larger human error due to the difference of the test operator; at present, the two tests are not executed any more in the technical field of sewage treatment in the oilfield industry.

The standard commonly executed in the oilfield sewage treatment industry at present is SY/T5329, according to the standard, after the professional detection unit performs field detection, water quality monitoring gazettes and water quality monitoring data are submitted once in a quarter, and a sewage treatment station of an oil extraction plant adjusts production parameters or corrects problems of a produced water treatment system according to the water quality condition and measure suggestions of the gazettes. The monitoring evaluation and management mode has the following three problems that (1) the test period is too long, the test data is difficult to be rapidly applied, the on-site problems are difficult to be rapidly fed back and rectified, the water quality monitoring comprises 12 indexes, each monitoring point of one site takes 7-15 days from the beginning of the detection to the test result, and the same site is again tested at a common interval of 90 days; (2) the test cost is high, the period of part of test projects is long, the cost is high, for example, a secondary dilution method or a tertiary dilution method in three bacterial monitoring needs to consume a large amount of test bottles, the cost rises year by year, and the test period needs 7 days; (3) in the standard sampling test process according to SY/T5329, a large amount of dangerous waste containing oil and solid waste are generated, so that the environmental safety is affected, and the production cost of enterprises is increased.

Meanwhile, as the problems of corrosion, scaling and the like commonly existing in the oilfield produced water treatment process and the purpose of improving stable water quality in the treatment process are needed to be added and dynamically adjusted in different positions in the oilfield produced water treatment process, the effective addition of the quality-preserving and quality-preserving agent for daily produced water treatment is another important working content of on-site produced water treatment work. Due to the current situation that the produced water layer system changes or the mixing of different produced water changes in the oilfield production process, the oilfield produced water treatment chemical agent needs to be periodically evaluated, and the quality of the produced water treatment effect of the agent is monitored, which is highly related to the quality standard reaching rate of the produced water. In addition, the evaluation of chemical agents for treating produced water is often carried out by utilizing a mode of on-site water sample collection and indoor evaluation by using a simulation device. There is no diagnostic device suitable for rapid on-site evaluation of the effect of a pharmaceutical treatment run.

In the prior art, the following patent documents mainly exist as a test device related to oilfield sewage treatment. The patent No. ZL2017800838595 turbidimeter device, sludge concentration device and method for determining the turbidity of a liquid sample with a turbidimeter device, fills the turbidimeter container with a vacuum pump while generating low pressure to effect degassing of the liquid sample. The device is complex, is mainly used for testing the turbidity of the sludge in an activated sludge system, is not suitable for an oilfield sewage system, and has high cost and complex maintenance. The patent number ZL201820630084 0 oily sewage on-line turbidity detection system establishes photoelectric balance by utilizing a photoelectric system, is installed at a water inlet end of the system, collects turbidity change data, and achieves the effect of exceeding early warning, but the special water inlet amount and water quality of oilfield sewage are extremely unstable, so that the system mostly cannot continuously and stably operate on site, and meanwhile, the problems of overhigh equipment purchase and installation cost and difficult maintenance exist due to the safety and explosion prevention requirements.

Disclosure of Invention

Aiming at the requirement of quick detection and feedback of sewage treatment effect in the oilfield sewage treatment field in the prior art, the utility model designs a field diagnosis device suitable for quick detection and feedback of oilfield sewage treatment condition after field sampling based on the correlation analysis of suspended solid content in sewage and the introduction of two detection indexes of light transmittance and potential difference.

The utility model aims to realize that the on-site diagnosis device for the oilfield sewage treatment condition comprises a test box, a light transmission instrument test element, an electrode unit and an electric appliance host unit, wherein the test box comprises a box body, a top cover and a plurality of glass test tubes, and is characterized in that a clamping seat for fixing the glass test tubes is arranged in the box body, a shading rubber barrel is arranged between the glass test tubes and the clamping seat, a transmitting tube hole and a receiving tube hole are respectively arranged on the radially corresponding side wall of the shading rubber barrel and used for installing the test element of the light transmission instrument, a rubber plug is arranged at the mouth part of the glass test tube, and a self-closing rubber hole is arranged on the surface of the rubber plug; the electrode unit comprises a plurality of groups of electrodes, and each group of electrodes is respectively inserted into the sample of the glass test tube and is electrically connected with the electric appliance host unit for testing the potential difference of the sample in the test tube.

The utility model relates to a field diagnosis device for oilfield sewage treatment conditions, which takes two pre-optimized projects affecting the quality of sewage as detection items, is designed to facilitate rapid detection after field sampling, is provided with a plurality of glass test tubes serving as sampling devices, can be removed and taken out in a detachable mode, is subjected to multi-point sampling along a path, is fixed in a test box for connecting test parts for testing after sampling, performs data processing and other operations, and can perform near indoor test after field sampling on each sewage treatment field. The method is particularly used for detecting the light transmittance and the potential difference of the water sample, so as to judge the suspended matter index in the water sample and serve as the basis of the adding and adjusting scheme of the treatment agent, the method can realize the direct indoor detection and assessment after the on-site sampling, realize the scheme of rapid detection, feedback and sewage treatment adjustment, reduce the detection cost and shorten the sampling and detection period.

In order to facilitate the detachable installation of the glass test tube, the clamping seat is clamped with the bottom support of the box body, a plurality of slotted holes are formed in the clamping seat at intervals, the shading rubber cylinder is respectively clamped in each slotted hole, and the glass test tube is clamped in the shading rubber cylinder and the slotted holes.

For the detection of the sewage sample luminousness in the glass test tube of being convenient for, luminousness test element includes light emitter, light receiver and light transmittance detector, light emitter and light receiver are installed respectively in transmitting tube hole and receiving tube hole and are connected with the light transmittance detector in the electrical apparatus host unit and are used for detecting the luminousness of glass test tube interior sample.

In order to facilitate connection of electrical circuits inside and outside the box, an electrical access hole is formed in a side plate of the test box and used for circuit connection between the box body and an electrical host unit.

Furthermore, two rubber holes are formed in the surface of the rubber plug, the rubber holes are designed in a central symmetry mode along the same diameter direction, and the rubber holes are used for penetrating air to replace electrodes of a pipeline or an electrode unit.

Further, the clamping seat is fixed along the length direction of the glass test box, the slotted holes are distributed at intervals along the length direction of the clamping seat, each glass test tube is detachably clamped in each slotted hole, and the central connecting line of each rubber hole on the rubber plug is parallel to the length direction of the test box after the rubber plug is covered on the pipe orifice of each glass test tube.

For the air in the evacuation pipe before being convenient for test, the air replacement pipe includes the intake pipe, a plurality of U communicating pipe and outlet duct, intake pipe and outlet duct cartridge respectively in the gluey downthehole of one of them glass test tube of limit side to the mouth of pipe and the liquid level distance of the inserted end of intake pipe are less than 5cm, the mouth of pipe and gluey downthehole parallel and level of downthehole side of mouth of pipe that stretches into the intraductal, the both ends of U-shaped communicating pipe insert respectively in the gluey downthehole of one of two adjacent glass test tubes, the both ends of U-shaped communicating pipe are respectively as the outlet duct of preceding glass test tube and the intake pipe of next glass test tube and mouth of pipe be located respectively and correspond the position of 5cm above the liquid level of pipe and with gluey downthehole side parallel and level.

In order to facilitate connection of the air replacement pipe, at least two through holes are formed in the surface of the top cover and are respectively used for penetrating through the air inlet pipe and the air outlet pipe.

Further, the electric appliance host unit comprises a power supply, a light transmission detector, a potentiometer and a display screen, wherein the potentiometer is connected with an electrode of the electrode unit and used for testing the electric potential in the test tube.

Drawings

Fig. 1 is a schematic view of the inside of the test box in embodiment 1 of the present utility model (the front side plate of the box body is moved to facilitate the display of the structure in the box).

Fig. 2 is a schematic view of the inside of the test box in embodiment 2 of the present utility model (the front side plate of the box body is moved to facilitate the display of the structure in the box).

FIG. 3 is an electrical schematic diagram of an in situ diagnostic device for oilfield sewage treatment conditions of the present utility model.

FIG. 4 is a graph of solids content of suspension versus eight index correlation analysis.

Wherein, 1 box body; 2. the top cover 3 is provided with an air inlet pipe; type 4U communicating tube: 5. an air outlet pipe; 6. a glass test tube; 7. a launch tube aperture; 8, a clamping seat; 9. a shading rubber cylinder; 10. an electrode; 11 an appliance host unit.

Detailed Description

According to the comparison test of a large amount of data in sewage treatment sites such as oilfield produced water and the like, analyzing correl function correlation of suspended solids content in sewage and various parameters, and obtaining that suspended solids content and light transmittance have good correlation, wherein main control indexes in oilfield produced water mainly comprise particulate matters and the like, evaluation of the operation conditions of an oilfield sewage treatment system and each unit system can cause light injected into the produced water to scatter and transmit based on the particulate matters in the produced water, and the quantity of the particulate matters in the produced water is in correlation with the size of transmitted light; the auxiliary control indexes such as sulfide content, carbon dioxide content and the like are related to the electrical property of the water body of the produced water, the potential is generally between-100 and-200 mv before oilfield sewage treatment, the electrical property of the water body is changed, and the change of potential data of a test unit can judge the action effect of the added agent in the prior art, thereby judging the field applicability of the agent. As shown in the table of fig. 4.

Based on the optimized screening of the detection and evaluation items of the water sample after the oil port sewage treatment and the neutralization treatment, the novel field diagnosis device for the oilfield sewage treatment condition is disclosed.

As shown in fig. 1-3, the field diagnosis device for oilfield sewage treatment condition comprises a test box, a light transmission instrument test element, an electrode unit and an electric appliance host unit 11, wherein the test box comprises a box body 1, a top cover 2 and a plurality of glass test tubes 6, a clamping seat 8 for fixing the glass test tubes 6 is arranged in the box body 1, a shading rubber cylinder 9 is arranged between the glass test tubes 6 and the clamping seat 8, a transmitting tube hole 7 and a receiving tube hole are respectively arranged on the radially corresponding side wall of the shading rubber cylinder 9 for installing the light transmission instrument test element, a rubber plug is arranged at the mouth of the glass test tube 6, and a self-closing rubber hole is arranged on the surface of the rubber plug; the electrode unit comprises a plurality of groups of electrodes 10, and each group of electrodes is respectively inserted into the sample of the glass test tube 6 and is electrically connected with the main unit of the electric appliance for testing the potential difference of the sample in the test tube. The electric appliance host unit 11 comprises a power supply, a light transmission detector, a potentiometer and a display screen, wherein the potentiometer is connected with an electrode 10 of the electrode unit and is used for testing the potential difference in the glass test tube 6.

In order to facilitate the sampling and dismounting of the glass test tube 6, the clamping seat 9 is clamped with the bottom support of the box body 1, the bottom is provided with a clamping rail structure for clamping the clamping seat 8, a plurality of slotted holes are arranged on the clamping seat 8 at intervals, the shading rubber barrel 9 is respectively clamped in each slotted hole, the shading rubber barrel 9 is generally made of black or dark rubber materials capable of realizing light shading, and the glass test tube 6 is clamped in the clamping seat 8; further, the clamping seat 8 is fixed along the length direction of the test box 1, the slotted holes are distributed at intervals along the length direction of the clamping seat 8, each glass test tube 6 is detachably clamped in each slotted hole, and the center connecting line of each rubber hole on the rubber plug is parallel to the length direction of the test box after the rubber plug cover is arranged at the pipe orifice of each glass test tube.

In order to facilitate the detection of the light transmittance of the sewage sample in the glass test tube 6, the light transmittance test element comprises a light emitter, a light receiver and a light transmittance detector, wherein the light emitter and the light receiver are respectively arranged in the transmitting tube hole 7 and the receiving tube hole and are connected with the light transmittance detector in the electric appliance host unit for detecting the light transmittance of the sample in the glass test tube 6; in order to facilitate connection of electrical circuits inside and outside the box, electrical access holes are formed in the side plates of the box body 1 of the test box and are used for connecting the circuits of the electrical equipment host unit with the electrical equipment in the box body 1.

Further, two glue holes are arranged on the surface of the rubber plug, and are respectively and symmetrically designed along the center of the same diameter direction, and the glue holes are used for penetrating air to replace the electrode 10 of the pipeline or the electrode unit.

As shown in fig. 1, in order to facilitate the testing of air in the front evacuation tube, the air replacement tube comprises an air inlet tube 3, a plurality of U-shaped communication tubes 4 and an air outlet tube 5, wherein the air inlet tube 3 and the air outlet tube 5 are respectively inserted into a glue hole of one of the glass test tubes 6 at the most side, a tube orifice of an insertion end of the air inlet tube 3 is positioned within a distance of 5cm above a liquid level, a tube orifice of the air outlet tube 5 extending into the tube is flush with the lower side of the glue hole, two ends of the U-shaped communication tube 4 are respectively inserted into the glue hole of one of the two adjacent glass test tubes 6, and two ends of the U-shaped communication tube 4 are respectively used as an air outlet tube of the previous glass test tube 6 and an air inlet tube of the next glass test tube 6, and the tube orifice of the air inlet tube is respectively positioned within a distance of 5cm above the liquid level of the corresponding tube and flush with the lower side of the glue hole.

In order to facilitate connection of the air replacement pipe, the surface of the top cover is provided with at least two through holes which are respectively used for penetrating through the air inlet pipe and the air outlet pipe. Tube holes can also be arranged above each corresponding glass test tube,

the test box structure at the time of the two index tests will be described below.

Example 1

As shown in fig. 1, the installation connection schematic diagram of the field diagnosis device for oilfield sewage treatment condition of this embodiment (for the convenience of seeing the internal structure, the front side plate is removed) is used for detecting the transmittance of the water sample in the glass test tube 6, meanwhile, the light transmitter and the light receiver are respectively installed in the transmitting tube hole 7 and the receiving tube hole and connected to the light transmission detector of the electric appliance host unit 11, in order to avoid the influence of a small amount of bubbles in the tube and the water sample on the detection result during detection, the air in the tube needs to be emptied when the light transmission tester is connected, therefore, after the water sample is packaged by the rubber plugs, the air replacement tube is connected in the rubber plug holes of each rubber plug, the air inlet tube 3 is connected to the nitrogen gas supply pipeline or the inert gas supply pipeline after connection, the switch is installed on the air supply pipeline for controlling the ventilation, and the ventilation is generally performed for 5 to 10 minutes, and the air in the tube can be discharged. Then the switch valve of the air inlet pipeline is closed, and the air outlet pipeline is also closed by a butterfly clamp or a pre-connected switch valve. The light transmittance detector is then turned on to test the sample in the tube and passed through the display and recorded for storage.

Example 2

As shown in fig. 2, the present embodiment can perform detection of the water sample potential difference in the tube based on the light transmittance test of embodiment 1, specifically, the air replacement tube of each glass test tube is removed without removing or removing the light transmittance detector, an electrode for potential difference measurement is inserted into the glue hole and connected to the potentiometer of the electrical host unit, and then the potentiometer is started to perform the detection of the water sample potential difference in each tube.

The field diagnosis device for the oilfield sewage treatment condition can sequentially test the light transmittance and the potential difference of the water sample, evaluate the qualification index of the sewage water sample according to the test result, can be independently used for single test of the light transmittance and the potential difference of the water sample, and can be used in various or proper changes. But are all within the scope of the utility model.

Claims (9)

1. The field diagnosis device for the oilfield sewage treatment condition comprises a test box, a light transmission instrument test element, an electrode unit and an electric appliance host unit, wherein the test box comprises a box body, a top cover and a plurality of glass test tubes, and is characterized in that a clamping seat for fixing the glass test tubes is arranged in the box body, a shading rubber barrel is arranged between the glass test tubes and the clamping seat, a transmitting tube hole and a receiving tube hole are respectively arranged on the radially corresponding side wall of the shading rubber barrel and used for installing the light transmission test element, a rubber plug is arranged at the opening part of the glass test tube, and a rubber hole capable of being closed by itself is arranged on the surface of the rubber plug; the electrode unit comprises a plurality of groups of electrodes, and each group of electrodes is respectively inserted into the sample of the glass test tube and is electrically connected with the electric appliance host unit for testing the potential difference of the sample in the test tube.

2. The field diagnosis device for oilfield sewage treatment condition according to claim 1, wherein the clamping seat is clamped with the bottom support of the box body, a plurality of slots are arranged on the clamping seat at intervals, a shading rubber cylinder is respectively clamped in each slot, and the glass test tube is clamped in the shading rubber cylinder and the slots.

3. The field diagnostic device of claim 1, wherein the light transmittance test element comprises a light emitter, a light receiver and a light transmittance detector, the light emitter and the light receiver being mounted in the light emitter aperture and the light receiver aperture, respectively, and being connected to the light transmittance detector in the electrical host unit for detecting the light transmittance of the sample in the glass test tube.

4. The field diagnostic device for oilfield sewage treatment conditions according to claim 1, wherein the side plates of the test tank are provided with electrical access holes for line connection with the main unit of the electrical appliance inside the tank.

5. The field diagnosis device for oilfield sewage treatment conditions according to claim 2, wherein two rubber holes are provided on the surface of the rubber plug, and are respectively designed to be central symmetry along the same diameter direction, and the rubber holes are used for penetrating the air replacement pipeline or the electrode of the electrode unit.

6. The field diagnosis apparatus of claim 5, wherein the clamping seat is fixed along the length direction of the glass test box, the slots are arranged at intervals along the length direction of the clamping seat, each glass test tube is detachably clamped in each slot, and the central line of each rubber hole on the rubber plug is parallel to the length direction of the test box after the rubber plug is covered on the pipe orifice of each glass test tube.

7. The field diagnosis apparatus of claim 6, wherein the air exchange tube comprises an air inlet tube, a plurality of U-shaped communicating tubes and an air outlet tube, the air inlet tube and the air outlet tube are respectively inserted into the glue holes of one of the glass test tubes at the most side, the distance between the pipe orifice of the insertion end of the air inlet tube and the liquid level is less than 5cm, the pipe orifice of the air outlet tube extending into the tube is flush with the lower side of the glue holes, two ends of the U-shaped communicating tube are respectively inserted into the glue holes of one of the two adjacent glass test tubes, and two ends of the U-shaped communicating tube are respectively used as the air outlet tube of the previous glass test tube and the air inlet tube of the next glass test tube, and the pipe orifice is respectively positioned at a position 5cm above the liquid level of the corresponding tube and a position flush with the lower side of the glue holes.

8. The on-site diagnosis apparatus for oilfield sewage treatment condition according to claim 6 or 7, wherein the top cover has two through holes formed on a surface thereof for passing through the air inlet pipe and the air outlet pipe, respectively.

9. The field diagnostic device of claim 1, wherein the electrical host unit comprises a power source, a light transmission detector, a potentiometer and a display screen, wherein the potentiometer is connected with an electrode of the electrode unit for testing the electric potential in the test tube.