A magnetite powder suspension preparation device and dust removal system

Abstract

This invention discloses a preparation device and dust removal system for magnetite powder suspension, belonging to the field of coal dust removal technology, to solve the problems of complex structure and sedimentation of magnetite powder suspension during transportation and filtration in existing technologies. The preparation device includes a mixing tank, a stirring impeller, a water inlet pipe, a mineral powder feeding port, and a liquid supply pipe. The stirring impeller is placed in the mixing tank and located at the bottom. The water inlet pipe is internally connected to the lower part of the mixing tank, with the water inlet direction tangential to the mixing tank. The mineral powder feeding port is located at the top of the mixing tank, and the liquid supply pipe penetrates the top of the mixing tank and extends below the liquid surface. This invention can be used for coal dust removal.

Description

Technical Field

[0001] This invention belongs to the field of coal dust removal technology, and particularly relates to a preparation device and dust removal system for magnetite powder suspension. Background Technology

[0002] In the prior art, the apparatus for preparing magnetite powder suspension typically includes a stirrer, a slurry pump, and a filter. The stirrer generates a suspension by stirring, and then the slurry pump delivers it to a filter screen. Vibration causes the magnetite powder particles and impurities in the suspension to be separated on the screen.

[0003] The preparation device for this type of magnetite powder suspension has a relatively complex structure, and the magnetite powder suspension may settle during the transportation and filtration process, which may affect the preparation of the magnetite powder suspension. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a preparation device and dust removal system for magnetite powder suspension, in order to solve the problems of complex structure of existing magnetite powder suspension preparation devices and sedimentation of magnetite powder suspension during transportation and filtration.

[0005] The objective of this invention is mainly achieved through the following technical solutions.

[0006] This invention provides an apparatus for preparing magnetite powder suspension, including a stirring tank, a stirring impeller, a water inlet pipe, a mineral powder feeding port, and a liquid supply pipe; the stirring impeller is placed in the stirring tank and located at the bottom of the stirring tank, the water inlet pipe is connected to the lower part of the stirring tank, the water inlet pipe is tangential to the stirring tank, the mineral powder feeding port is located at the top of the stirring tank, and the liquid supply pipe passes through the top of the stirring tank and extends to below the liquid surface of the stirring tank.

[0007] Furthermore, the water inlet pipe is either a straight pipe or an arc-shaped pipe.

[0008] Furthermore, the stirring impeller is rotatably connected to the bottom of the mixing tank via bearings.

[0009] Furthermore, the above-mentioned apparatus for preparing magnetite powder suspension also includes a filter screen located at the inlet end of the liquid supply pipe.

[0010] Furthermore, the filter mesh has a pore size of 200-300 mesh.

[0011] Furthermore, the ratio of the distance between the top of the impeller and the inlet end of the liquid supply pipe to the distance between the inlet end of the liquid supply pipe and the liquid surface of the mixing tank is 0.8 to 1.2.

[0012] Furthermore, the height of the mixing tank is 1 to 1.2 m, the height of the impeller is 0.1 to 0.2 m, the distance between the liquid inlet end of the liquid supply pipe and the bottom of the mixing tank is 0.4 to 0.5 m, and the distance between the liquid surface of the mixing tank and the bottom of the mixing tank is 0.7 to 0.8 m.

[0013] Furthermore, the above-mentioned magnetite powder suspension preparation device also includes a liquid level monitor installed in the stirring tank.

[0014] Furthermore, the level monitor is a hydrostatic level monitor.

[0015] The present invention also provides a dust removal system, including the above-mentioned apparatus for preparing magnetite powder suspension.

[0016] Compared with the prior art, the present invention can achieve at least the following beneficial effects:

[0017] The magnetite powder suspension preparation device provided by this invention adopts a bottom tangential water inlet, top powder inlet, and middle liquid collection method, integrating stirring and conveying into the same stirring drum, resulting in a simple structure. On one hand, the bottom tangential water inlet and the rotation of the stirring impeller cause the water in the stirring drum to swirl fully, enhancing the turbulence effect of the water and promoting the mixing of water and magnetite powder, thus facilitating the generation of magnetite powder suspension. On the other hand, because the stirring drum has a bottom tangential water inlet and a top powder inlet, the magnetite powder suspension in the middle position of the stirring drum is relatively stable and uniform. Liquid is directly collected from the middle position of the stirring drum through the liquid supply pipe 12 and then connected to the subsequent dust removal device. Under the negative pressure suction of the subsequent dust removal device, it is supplied to the dust removal device for coal dust removal, which can effectively reduce the sedimentation of the magnetite powder suspension during the conveying and filtration process.

[0018] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0019] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0020] Figure 1 This is a schematic diagram of the apparatus for preparing magnetite powder suspension according to Embodiment 1 of the present invention;

[0021] Figure 2 This is a schematic diagram of the dust removal system provided in Embodiment 2 of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the dust removal microporous membrane in the dust removal system provided in Embodiment 2 of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the electromagnet orifice plate in the dust removal system provided in Embodiment 2 of the present invention;

[0024] Figure 5 This is a schematic diagram of the sewage discharge and dust removal process in the dust removal system provided in Embodiment 2 of the present invention.

[0025] Figure label:

[0026] 1-Agitator; 2-Air compressor; 3-Atomizer; 4-Atomizing nozzle; 5-Spray nozzle; 6-Dust removal microporous membrane; 7-Electromagnetic orifice plate; 8-Reciprocating drive mechanism; 9-Connecting rod; 10-Guide rail; 11-Box; 12-Liquid supply pipe; 13-Air supply pipe; 14-Liquid regulating valve; 15-Air regulating valve; 16-Inlet dust concentration detector; 17-Outlet dust concentration detector; 18-Guide channel; 19-Collection tank; 20-Connecting shaft; 21-Dust removal airflow outlet; 22-Axial flow fan; 23-Dust airflow inlet; 24-Collection tank; 25-Agitator impeller; 26-Water inlet pipe; 27-Mineral powder feed port; 28-Filter screen; 29-Liquid level monitor. Detailed Implementation

[0027] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0028] Example 1

[0029] This embodiment provides an apparatus for preparing a magnetite powder suspension, see [link to apparatus]. Figure 1 The system includes a mixing tank 1, an impeller 25, a water inlet pipe 26, a mineral powder feed port 27, and a liquid supply pipe 12. The mixing tank 1 is placed on an installation surface (e.g., the ground) via a tank support. The impeller 25 is placed in the mixing tank 1 and located at the bottom of the mixing tank 1. The impeller 25 is rotatably connected to the bottom of the mixing tank 1 via a bearing. The water inlet pipe 26 is connected to the lower part of the mixing tank 1, and the water inlet direction of the water inlet pipe 26 is along the tangent of the mixing tank 1. The mineral powder feed port 27 is opened at the top of the mixing tank 1, and magnetite powder is added to the mixing tank 1 through the mineral powder feed port 27. The liquid supply pipe 12 passes through the top of the mixing tank 1 and extends to below the liquid surface of the mixing tank 1.

[0030] Compared with the prior art, the magnetite powder suspension preparation device provided in this embodiment adopts a bottom tangential water inlet, top powder inlet, and middle liquid extraction method, and integrates stirring and conveying in the same stirring drum, which has a simple structure.

[0031] On the one hand, the water in the mixing tank 1 is fully swirled by the tangential water inlet below and the rotation of the stirring impeller 25, which enhances the turbulence effect of the water, promotes the mixing of water and magnetite powder, and facilitates the generation of magnetite powder suspension.

[0032] On the other hand, since water is tangentially fed into the bottom and powder is fed into the top of the mixing tank 1, the magnetite powder suspension in the middle of the mixing tank 1 is relatively stable and uniform. The liquid is directly taken from the middle of the mixing tank 1 through the liquid supply pipe 12 and then connected to the subsequent dust removal device. Under the negative pressure attraction of the subsequent dust removal device, it is supplied to the dust removal device for coal dust removal, which can effectively reduce the sedimentation of the magnetite powder suspension during the transportation and filtration process.

[0033] For example, the water inlet pipe 26 is a straight pipe or an arc-shaped pipe. Preferably, the water inlet pipe 26 is an arc-shaped pipe, that is, the water inlet pipe 26 adopts an asymptotic method, which can effectively reduce the impact of water on the wear of the mixing tank 1 wall.

[0034] In order to filter the magnetite powder suspension entering the liquid supply pipe 12 and avoid clogging the downstream equipment, the above-mentioned magnetite powder suspension preparation device also includes a filter screen 28 located at the liquid inlet end of the liquid supply pipe 12, through which the magnetite powder suspension is pre-filtered.

[0035] For example, based on the particle size of the mineral powder being 800 mesh, the pore size of the filter mesh 28 is 200 to 300 mesh, thereby enabling effective filtration of the magnetite powder suspension.

[0036] In order to extract a stable and uniform magnetite powder suspension, the ratio of the distance between the top of the impeller 25 and the liquid inlet end of the supply pipe to the distance between the liquid inlet end of the supply pipe and the liquid surface of the mixing tank 1 is 0.8 to 1.2. That is to say, the liquid inlet end of the supply pipe is located at the middle position between the top of the impeller 25 and the liquid surface of the mixing tank 1.

[0037] For example, the height of the mixing tank 1 is 1 to 1.2 m, the height of the stirring impeller 25 is 0.1 to 0.2 m, the distance between the liquid inlet end of the liquid supply pipe and the bottom of the mixing tank 1 is 0.4 to 0.5 m, and the distance between the liquid surface of the mixing tank 1 and the bottom of the mixing tank 1 is 0.7 to 0.8 m.

[0038] Considering that the height of the liquid level in the mixing tank 1 directly affects the performance of the extracted magnetite powder suspension, the above-mentioned magnetite powder suspension preparation device also includes a liquid level monitor 29 (e.g., a hydrostatic liquid level monitor) installed in the mixing tank 1, which monitors the liquid level height in the mixing tank 1 in real time.

[0039] Example 2

[0040] This embodiment provides a dust removal system; see [link / reference] Figure 2This includes the apparatus for preparing magnetite powder suspension provided in Example 1.

[0041] Compared with the prior art, the beneficial effects of the dust removal system provided in this embodiment are basically the same as those of the magnetite powder suspension preparation device provided in Embodiment 1, and will not be described in detail here.

[0042] For example, the structure of the dust removal system specifically includes a housing 11 and, sequentially arranged along the dust airflow direction, a magnetite powder suspension preparation device, an atomizing unit, a spray nozzle 5, and a dust removal microporous membrane 6 (e.g., a plastic microporous membrane, see [link]). Figure 3 ), Electromagnetic orifice plate 7 (see Figure 4 The atomizing unit's atomized droplet outlet, spray nozzle 5, dust removal microporous membrane 6, electromagnet orifice plate 7, and axial flow fan 22 are all located inside the housing 11. One end of the housing 11 has a dust airflow inlet 23, and the other end has a dust removal airflow outlet 21. The spray nozzle 5 sprays water towards the dust removal microporous membrane 6, and the spray water sprayed by the spray nozzle 5 forms a water film on the dust removal microporous membrane 6. During the dust removal process, the electromagnet orifice plate 7 is energized, causing the magnetite powder to be adsorbed on the surface of the dust removal microporous membrane 6 facing away from the electromagnet orifice plate 7. After the dust removal is completed, the electromagnet orifice plate 7 is de-energized, causing the magnetite powder to detach from the surface of the dust removal microporous membrane 6 facing away from the electromagnet orifice plate 7.

[0043] During implementation, the axial flow fan 22 is turned on, creating a negative pressure inside the housing 11. The dust-laden airflow is drawn into the housing 11 after passing through the dust-laden airflow inlet 23. The magnetite powder suspension prepared by the magnetite powder suspension preparation device is sprayed into the housing 11 as atomized droplets through the atomization unit. Simultaneously, the magnetite powder in the atomized droplets undergoes secondary crushing, resulting in smaller atomized droplets. The atomized droplets collide with the dust-laden airflow. During the collision, the dust in the airflow is captured by the atomized droplets, forming solid-liquid two-phase droplets, thus performing primary dust removal on the airflow. Some of the solid-liquid two-phase droplets accumulate and fall, while the remaining droplets continue to flow. After primary dust removal, the airflow and the entrained atomized droplets flow to the dust removal microporous membrane 6. The entrained atomized droplets and the spray water from the spray nozzle 5 form a water film on the micropores of the dust removal microporous membrane 6. The water film performs secondary dust removal on the dust-laden airflow. The atomized droplets gather on the dust-removing microporous membrane 6 to form a water flow that flows down with the water film. During the dust removal process, the electromagnet orifice plate 7 is energized. The magnetite powder that has detached from the atomized droplets uses its own adsorption properties to perform tertiary dust removal on the dust in the airflow after secondary dust removal, agglomerating into solid particles. Under the action of the electromagnet orifice plate 7, the solid particles are adsorbed onto the surface of the dust-removing microporous membrane 6 facing away from the electromagnet orifice plate 7. The dust in the solid particles is washed away from the magnetite powder during the flow of water and water film, and flows down with the water flow and water film. The dust-removed airflow passes through the micropores of the dust-removing microporous membrane 6 and the plate holes of the electromagnet orifice plate 7, and finally flows out from the dust-removed airflow outlet 21, completing the dust removal of the airflow. After dust removal, the electromagnet orifice plate 7 is de-energized, causing the magnetite powder to detach from the surface of the dust-removing microporous membrane 6 facing away from the electromagnet orifice plate 7, completing the recovery of the magnetite powder.

[0044] The dust removal system described above employs a solid-liquid two-phase flow dust removal method, rather than the gas-liquid two-phase flow method used in existing dust removal devices. This offers advantages such as simple structure, high automation, high recycling rate, and excellent dust removal effect. Firstly, a magnetite powder suspension is used as the spray source. The magnetite powder can secondary break down the droplets sprayed from the magnetite powder suspension atomizing nozzle 4, achieving secondary atomization, reducing droplet size, effectively improving atomization effect, and reducing water consumption. Simultaneously, since dust is typically negatively charged and magnetite powder itself is magnetic, it can adsorb dust during contact, further enhancing the dust removal effect. Secondly, an electromagnet orifice plate 7 is installed behind the dust removal microporous membrane 6. The microporous membrane 6 can filter out droplets carrying dust while forming a liquid film to prevent secondary dust re-entrainment. The electromagnet orifice plate 7 can adsorb magnetite powder electromagnetically. Timed demagnetization of the electromagnet orifice plate 7 enables the recovery and reuse of the magnetite powder.

[0045] Specifically, the structure of the atomizing unit includes an air compressor 2, an atomizer 3, and an atomizing nozzle 4. The atomizer 3 is fixedly connected to the housing 11 via an atomizer bracket. The liquid supply pipe 12 is connected to the inlet of the atomizer 3. The air outlet of the air compressor 2 is connected to the inlet of the atomizer 3 via an air supply pipe 13. The inlet of the atomizer 3 is connected to the outlet of the atomizer 3 via a metal pipe. The outlet of the atomizer 3 is threadedly connected to the atomizing nozzle 4. The inlet of the atomizer 3 is located outside the housing 11, and the outlet of the atomizer 3 is located at the center inside the housing 11, with the mist output direction being the same as the dust airflow direction.

[0046] It is understandable that, in order to adjust the amount of mist output from the atomizing unit and the size of the atomized droplets, the atomizing unit also includes a liquid regulating valve 14 on the liquid supply pipe 12 and an air regulating valve 15 on the air supply pipe 13.

[0047] In order to monitor the dust removal effect in real time, the dust removal system also includes an inlet dust concentration detector 16 located at the dust airflow inlet 23 and an outlet dust concentration detector 17 located at the dust removal outlet 21.

[0048] In order to achieve the collection of dust and wastewater, the dust removal system also includes a guide channel 18 located below the atomized droplet outlet and the spray nozzle 5, and a collection tank 19 located below the dust removal microporous membrane 6. The guide channel 18 and the collection tank 19 are connected and located outside the housing 11. In this way, during the flow of dust airflow and atomized droplets of magnetite powder suspension, the atomized droplets of dust airflow and magnetite powder suspension can fall into the guide channel 18 after agglomeration, and further flow into the collection tank 19. The atomized droplets agglomerate on the dust removal microporous membrane 6 to form a water flow and a water film that can flow into the collection tank 19, thereby achieving the collection of dust and wastewater.

[0049] Similarly, in order to achieve the collection and recycling of magnetite powder, the dust removal system also includes a dust collection tank 24 located below the dust removal microporous membrane 6. The dust collection tank 24 is located outside the housing 11. Magnetite powder that detaches from the surface of the dust removal microporous membrane 6 facing away from the electromagnet orifice plate 7 can fall into the dust collection tank 24, thereby achieving the collection and recycling of magnetite powder.

[0050] In practical applications, it is necessary to separate dust, wastewater, and magnetite powder. The dust removal system also includes a slide rail assembly. The dust removal microporous membrane 6 is slidably connected to the slide rail assembly housing 11. Along the direction of dust airflow, the guide channel 18, the sludge collection tank 19, and the powder collection tank 24 are arranged in sequence. The dust removal microporous membrane 6 has a sludge discharge state and a powder removal state. When the dust removal microporous membrane 6 is in the sludge discharge state, it slides along the slide rail to the top of the sludge collection tank 19. When the dust removal microporous membrane 6 is in the powder removal state, it slides along the slide rail to the top of the powder collection tank 24.

[0051] Understandably, in order to drive the reciprocating motion of the dust-collecting microporous membrane 6, thereby enabling switching between the sewage discharge and dust removal states, the structure of the slide rail assembly, specifically, refers to... Figure 5 It includes a guide rail 10, a reciprocating drive mechanism 8 and a connecting rod 9. The dust removal microporous membrane 6 is slidably connected to the housing 11 through the guide rail 10. The dust removal microporous membrane 6 is connected to the reciprocating drive mechanism 8 through the connecting rod 9. The reciprocating drive mechanism 8 can drive the dust removal microporous membrane 6 to perform reciprocating motion.

[0052] Because magnetite powder contains water, it easily adheres to the dust removal microporous membrane 6 and cannot be removed. In addition, dust in sewage also easily deposits on the dust removal microporous membrane 6. In order to promote the removal of dust and magnetite powder, the dust removal microporous membrane 6 is provided with a connecting shaft 20. The connecting shaft 20 has a through hole along the axial direction. The cross-sectional shape of the through hole is elongated. One end of the connecting rod 9 is inserted into the through hole, and there is a gap between the connecting rod 9 and the hole wall in the vertical direction. The guide rail 10 is located in the housing 11 and can rotate in the horizontal direction. The cross-sectional shape of the guide rail 10 parallel to the direction of movement of the dust removal microporous membrane 6 is triangular.

[0053] Based on the structure of the slide rail assembly described above, the sewage discharge and dust removal process is as follows:

[0054] The dust-collecting microporous membrane 6 is in the discharge state, located at the lowest point of the guide rail 10 (i.e., the end closest to the dust airflow inlet 23, with a height of 0). The dust-collecting microporous membrane 6 gradually moves upward along the guide rail 10. Simultaneously, the end of the connecting shaft 20 moves upward in the through hole, adapting to the vertical displacement of the dust-collecting microporous membrane 6 through the gap between the through hole and the connecting shaft 20. When the dust-collecting microporous membrane 6 reaches the highest point of the guide rail 10 and continues to move, it will suddenly detach from the guide rail 10, fall vertically, and vibrate. At this time, the dust-collecting microporous membrane 6 is in the dust removal state. The vibration causes the magnetite powder to immediately detach from the dust-collecting microporous membrane 6. At the same time, the guide rail 10 rotates 180°. The dust-collecting microporous membrane 6 is located on the guide rail. At the lowest point of guide rail 10 (i.e., the end furthest from the dust airflow inlet 23, with a height of 0), the dust-collecting microporous membrane 6 gradually moves upward along guide rail 10. Simultaneously, the end of connecting shaft 20 moves upward within the through hole, adapting to the vertical displacement of the dust-collecting microporous membrane 6 through the gap between the through hole and connecting shaft 20. When the dust-collecting microporous membrane 6 reaches the highest point of guide rail 10 and continues to move, it will suddenly detach from guide rail 10, fall vertically, and vibrate. At this time, the dust-collecting microporous membrane 6 is in a dust discharge state; the vibration causes the dust to immediately detach from the dust-collecting microporous membrane 6. Simultaneously, guide rail 10 rotates 180°. Repeating this process achieves complete separation of dust and magnetite powder. See [reference needed]. Figure 5 .

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A dust extraction system characterised in that, The device includes a housing and a preparation apparatus for magnetite powder suspension arranged sequentially along the dust flow direction, an atomizing unit, a spray nozzle, a dust removal microporous membrane, and an electromagnet orifice plate. The preparation apparatus for magnetite powder suspension includes a mixing tank, a stirring impeller, a water inlet pipe, a mineral powder feeding port, and a liquid supply pipe. The stirring impeller is placed in the mixing tank and located at the bottom of the mixing tank. The water inlet pipe is connected to the lower part of the mixing tank and the water inlet direction is along the tangential direction of the mixing tank. The mineral powder feeding port is located at the top of the mixing tank, and the liquid supply pipe passes through the top of the mixing tank and extends to below the liquid surface of the mixing tank. The spray nozzle directs water toward the dust removal microporous membrane, and the spray water from the nozzle forms a water film on the dust removal microporous membrane. During the dust removal process, the electromagnet orifice plate is energized, and after the dust removal is completed, the electromagnet orifice plate is de-energized. The dust removal system also includes a sludge collection tank and a dust collection tank. The dust removal microporous membrane is slidably connected to the housing via a slide rail assembly. The dust removal microporous membrane has a sludge discharge state and a dust removal state. When the dust removal microporous membrane is in the sludge discharge state, it slides along the slide rail to the top of the sludge collection tank. When the dust removal microporous membrane is in the dust removal state, it slides along the slide rail to the top of the dust collection tank. The slide rail assembly includes a guide rail, a reciprocating drive mechanism, and a connecting rod. The dust-collecting microporous membrane is slidably connected to the housing via the guide rail, and the dust-collecting microporous membrane is connected to the reciprocating drive mechanism via the connecting rod. The dust-collecting microporous membrane is provided with a connecting shaft, and the connecting shaft has a through hole along the axial direction. The cross-sectional shape of the through hole is elongated. One end of the connecting rod is inserted into the through hole, and there is a gap between the connecting rod and the hole wall in the vertical direction. The guide rail is located inside the housing and can rotate in the horizontal direction. The cross-sectional shape of the guide rail parallel to the direction of movement of the dust-collecting microporous membrane is triangular.

2. The dust extraction system of claim 1, wherein, The water inlet pipe can be a straight pipe or an arc-shaped pipe.

3. The dust extraction system of claim 1, wherein, The stirring impeller is rotatably connected to the bottom of the mixing tank via a bearing.

4. The dust extraction system of claim 1, wherein, It also includes a filter screen located at the inlet end of the liquid supply pipe.

5. The dust extraction system of claim 4, wherein, The filter mesh has a pore size of 200-300 mesh.

6. The dust extraction system of claim 1, wherein, The ratio of the distance between the top of the stirring impeller and the liquid inlet end of the liquid supply pipe to the distance between the liquid inlet end of the liquid supply pipe and the liquid surface of the stirring tank is 0.8~1.

2.

7. The dust extraction system of claim 6, wherein, The height of the mixing tank is 1~1.2m, the height of the mixing impeller is 0.1~0.2m, the distance between the liquid inlet end of the liquid supply pipe and the bottom of the mixing tank is 0.4~0.5m, and the distance between the liquid surface of the mixing tank and the bottom of the mixing tank is 0.7~0.8m.

8. The dust extraction system of claim 1, wherein, It also includes a liquid level monitor installed inside the mixing tank.

9. The dust extraction system of claim 8, wherein, The liquid level monitor is a hydrostatic liquid level monitor.

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