Ceramic filter concentrated acid tank with protection function

Abstract

The invention belongs to the technical field of concentrated acid tank replenishing, and relates to a ceramic filter concentrated acid tank with a protection function, which comprises a concentrated acid tank body, a connecting part and a liquid level meter, the connecting part comprises an upper thread part, a middle transition part and a lower flange part; the upper thread part is provided with an internal thread; the middle transition part extends towards the concentrated acid tank body; the interior of the middle transition part is of a hollow structure; the lower flange part is mounted on the reserved mounting flange; the top end of the liquid level meter is connected with an internal thread of the upper thread part, and the bottom end of the liquid level meter penetrates through the middle transition part and the lower flange part and then extends into the concentrated acid tank body; the liquid level meter is a corrosion-resistant capacitive liquid level meter; according to the device, accurate monitoring and linkage alarming of the upper limit and the lower limit of the liquid level are achieved, and the production safety and the intrinsic safety level are effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of concentrated acid tank supplementing, and relates to a ceramic filter machine concentrated acid tank with a protection function. BACKGROUND

[0002] In the iron concentrate dewatering process, the ceramic filter machine is used as the core dewatering equipment, and periodic acid washing (usually 98% concentrated nitric acid is used) is required to remove the oligomer residues in the filter plate pores to maintain the filtering efficiency. In the prior art, the liquid level monitoring of the concentrated nitric acid storage tank (such as a 6m³ concentrated nitric acid tank) generally uses a mechanical lifting float rod liquid level meter, which indicates the liquid level by driving a mechanical transmission mechanism through the lifting and lowering of the float ball with the liquid level. However, this scheme has significant defects under strong corrosive media (concentrated nitric acid) and complex working conditions: 1. Risk of liquid level monitoring failure The concentrated nitric acid has strong corrosiveness (can dissolve metals), high volatility (easy to form acid mist) and crystallization characteristics (nitric acid crystals are precipitated at low temperatures), which causes the frequent jamming or stalling of the float rod transmission mechanism. For example, the metal parts of the float ball connecting rod are rusted and stuck under the corrosion of acid mist, the liquid level indication is distorted for a long time, which may cause insufficient acid washing liquid, increase the residual filter cake of the ceramic filter plate, and seriously affect the dewatering efficiency.

[0003] 2. Safety hazard of acid supplement control When the external tank car supplements the acid, the mechanical liquid level meter has a delayed response (large inertia of the float ball) and insufficient accuracy (only can roughly indicate the liquid level interval), and the operator cannot determine the liquid level rising speed in real time. In actual cases, acid overflow accidents caused by liquid level misjudgment occur frequently, causing equipment corrosion (such as sealing failure of the tank body flange), nitric acid leakage and environmental pollution, and even causing the risk of personnel burns.

[0004] 3. Urgency of technical improvement Existing patent schemes (such as prior art 1-4) involve liquid level detection technology, but none of them can meet the needs of this scenario: Prior art 1, CN214789114U is directed to a vibration type coal feeder gate limiting device, which isolates vibration interference through a mechanical structure, and cannot solve the problems of interface compatibility and long-term corrosion resistance under strong corrosive media.

[0005] Prior art 2, CN116592268B uses a capacitive liquid level meter integrated in the folding and rotating structure of an LNG storage tank, which is suitable for low temperature (-162℃) and low corrosive media, and cannot solve the problems of corrosion of 98% concentrated nitric acid and crystallization under normal temperature conditions.

[0006] Prior art 3, CN105197456A is a liquid level meter designed for a storage tank, and cannot be retrofitted and upgraded on the existing fixed interface tank body, involving the problem of interface matching between new and old equipment.

[0007] Prior art 4, CN216899117U automobile tank car liquid level monitoring system relies on flange fixation and internal support anti-shaking design, and does not solve the chemical compatibility and long-term stability of the instrument interface under the corrosion of concentrated nitric acid.

[0008] In summary, the prior art has significant deficiencies in liquid level detection reliability in strong corrosion environment, interface adaptability of old equipment and dynamic acid supplement control precision, and a non-contact, corrosion-resistant and seamless interface with existing concentrated acid tank interface liquid level monitoring and control system is urgently needed to ensure production safety and continuous operation. SUMMARY

[0009] The application provides a ceramic filter concentrated acid tank with protection function, which realizes non-contact, corrosion-resistant and seamless interface with existing tank interface liquid level monitoring and control system of concentrated acid tank based on corrosion-resistant capacitive liquid level meter, so as to ensure production safety and continuous operation.

[0010] To achieve the above technical purpose, the technical scheme adopted by the application is a ceramic filter concentrated acid tank with protection function, comprising a concentrated acid tank body, a liquid level meter installation port is pre-set on the concentrated acid tank body, and a reserved installation flange is arranged on the liquid level meter installation port; further comprising a connecting component and a liquid level meter; the liquid level meter is installed on the reserved installation flange through the connecting component; The connecting component is a stepped variable diameter flange adapter, comprising an upper threaded part, an intermediate transition part and a lower flange part; The upper threaded part is provided with an internal thread; The intermediate transition part extends to the concentrated acid tank body; the inside of the intermediate transition part is a hollow structure; The lower flange part is installed on the reserved installation flange; The top end of the liquid level meter is connected with the internal thread of the upper threaded part, and the bottom end of the liquid level meter extends into the concentrated acid tank body after penetrating through the intermediate transition part and the lower flange part; the liquid level meter is a corrosion-resistant capacitive liquid level meter; The length of the intermediate transition part matches the difference between the length of the selected corrosion-resistant capacitive liquid level meter and the internal height of the on-site concentrated acid tank body, so as to ensure that the liquid level meter is stably installed on the reserved installation flange, and the probe of the liquid level meter reaches the preset measurement position in the concentrated acid tank.

[0011] As an improved technical solution of the application, the concentrated acid tank body is provided with an exhaust port at the top.

[0012] As an improved technical solution of the application, the concentrated acid tank body is provided with an acid supplement port at the top.

[0013] As the improved technical solution of the present application, the bottom of the concentrated acid tank body is provided with an acid discharge port; the acid discharge port is communicated with an external dilute acid cylinder through a magnetic pump.

[0014] As the improved technical solution of the present application, a controller is further included, which receives a liquid level meter signal; the controller is pre-set with upper and lower limit values of the liquid level, and determines whether to trigger an alarm according to the signal.

[0015] As the improved technical solution of the present application, an alarm is further included, which alarms according to the alarm signal triggered by the controller; the alarm has two units, which are respectively arranged at the post room and the door of the acid supplement tank; the post room alarm corresponds to the alarm signal when the liquid level in the concentrated acid tank body reaches the lower limit value; the acid supplement port alarm corresponds to the alarm signal when the liquid level in the concentrated acid tank body reaches the upper limit value.

[0016] As the improved technical solution of the present application, a sealing element is arranged between the lower flange part and the connecting surface of the reserved mounting flange.

[0017] As the improved technical solution of the present application, a sealing element is arranged at the connecting position of the upper threaded part and the liquid level meter.

[0018] As the improved technical solution of the present application, the corrosion-resistant capacitive liquid level meter includes a probe and a transmitter; the probe is a stainless steel probe rod coated with full polytetrafluoroethylene (PTFE); the probe is connected with the transmitter, and the connecting joint part of the two is made of Hastelloy or titanium alloy material. Advantages

[0019] The present application is based on the structural adaptation of the stepped variable-diameter flange adapter, the corrosion-resistant design of the full PTFE-coated probe and the Hastelloy / titanium alloy joint, and achieves the effects of reliable installation, long-term stable operation and precise liquid level monitoring of the liquid level meter without changing the main structure of the concentrated acid tank.

[0020] Specifically, the capacitive liquid level meter is installed on the original lifting float rod reserved mounting flange through a customized connecting component. The customized connecting component is a stepped variable-diameter flange adapter, which includes a lower flange part matched with the concentrated acid tank body reserved mounting flange, an upper threaded part matched with the liquid level meter, an intermediate transition part matched with the corrosion-resistant capacitive liquid level meter and the height / depth of the concentrated acid tank body, and a sealing structure for ensuring sealing. The existing corrosion-resistant capacitive liquid level meter is effectively matched with the existing concentrated acid tank.

[0021] The corrosion-resistant capacitive liquid level meter of the concentrated acid tank of the present application has a probe which is a stainless steel probe rod coated with full polytetrafluoroethylene (PTFE), and the connecting joint is made of Hastelloy or titanium alloy material.

[0022] The concentrated acid tank acid level protection and control system of the application contains the above-mentioned customized connecting components and corrosion-resistant capacitive liquid level meters, and realizes double-point linkage alarm of upper and lower limits of liquid level (post room and acid supplement port).

[0023] In summary, the device of the application aims to solve the interface adaptation and material corrosion resistance problems encountered during the upgrading and modification of existing equipment under specific high-risk and strong corrosion conditions. By setting special structure adaptation components and selecting special corrosion-resistant materials, precise, reliable and long-term monitoring of the acid level of the concentrated acid tank is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 The structure schematic diagram of the device of the application is shown; Fig. 2 The liquid level meter installation structure schematic diagram is shown; Fig. 3 The connecting component structure schematic diagram is shown; In the figure, 1 is a concentrated acid tank body; 2 is a connecting component; 3 is a corrosion-resistant capacitive liquid level meter; 4 is an exhaust port; 5 is an acid supplement port; 6 is a magnetic pump; 7 is a dilute acid cylinder; 8 is a ceramic filter; 2-1 is an upper threaded part, 2-2 is a middle transition part, 2-3 is a lower flange part, and 2-4 is a sealing element. DETAILED DESCRIPTION

[0025] The device aims to solve the technical problems of inaccurate liquid level monitoring and the risk of acid overflow during the acid supplement process caused by the use of traditional lifting float rod type liquid level meters for concentrated acid tanks storing 98% concentrated nitric acid in the prior art. Specifically, the core problem to be solved by the device is the sealing risk caused by incompatible installation interfaces and the difficulty of long-term stable operation of equipment in a strong corrosion environment when replacing old mechanical liquid level meters with new liquid level meters without changing the main structure of the concentrated acid tank. Through the device, real-time, accurate and reliable monitoring of the acid level of the concentrated acid tank is achieved, effectively avoiding acid shortage shutdown and acid overflow accidents, and ensuring safe and stable operation of production.

[0026] In this paper, the corrosion-resistant capacitive liquid level meter can use product model: HY1-DY12, GLZ00-1500, manufacturer: Tongling Huayao Instrument and Meter Co., Ltd.

[0027] As Figs. 1-3 shown, a ceramic filter concentrated acid tank with protection function includes a concentrated acid tank body 1, a liquid level meter installation port is pre-set on the concentrated acid tank body 1, and a reserved installation flange is arranged on the liquid level meter installation port. It also includes a connecting component 2 and a liquid level meter; the liquid level meter is installed on the reserved installation flange through the connecting component 2.

[0028] The connecting component 2 is a stepped reducing flange adapter, including an upper threaded portion 2-1, an intermediate transition portion 2-2, and a lower flange portion 2-3. The upper threaded portion 2-1 has internal threads. The intermediate transition portion 2-2 extends into the concentrated acid tank 1 to adjust the overall length of the connecting component 2. Specifically, by customizing the height of the intermediate transition portion 2-2, it adapts to capacitive level gauges of different standard lengths (corrosion-resistant) (such as 630mm, 710mm, 1000mm, 1500mm, etc.), achieving a reliable connection between the level gauge and the reserved mounting flange without changing the main structure of the concentrated acid tank, ensuring that the probe extension length into the tank meets the measurement requirements. The intermediate transition portion 2-2 has a hollow internal structure. The lower flange portion 2-3 is installed on the reserved mounting flange. The top of the level gauge is connected to the internal thread of the upper threaded part 2-1, and the bottom of the level gauge extends into the concentrated acid tank 1 after passing through the intermediate transition part 2-2 and the lower flange part 2-3; the level gauge is a corrosion-resistant capacitive level gauge 3. Specifically, the top of the level gauge (corrosion-resistant capacitive level gauge 3) (with external thread) is screwed into the internal thread of the upper threaded part 2-1 of the connecting part 2, and is sealed and fixed by the sealing element 2-4, while the probe extends downward through the central through hole of the connecting part 2 into the concentrated acid tank 1.

[0029] The length of the intermediate transition section 2-2 is matched to the difference between the length of the selected corrosion-resistant capacitive level gauge 3 and the internal height of the concentrated acid tank 1, ensuring that the corrosion-resistant capacitive level gauge 3 is securely installed on the reserved mounting flange and that the probe of the level gauge (corrosion-resistant capacitive level gauge 3) reaches the preset measurement position in the concentrated acid tank. The length of the intermediate transition section 2-2 can be customized according to the height of the concentrated acid tank and the length of the selected capacitive level gauge (corrosion-resistant capacitive level gauge 3) to ensure that the connecting component 2 can securely install the level gauge on the reserved mounting flange and that the probe reaches the ideal measurement position.

[0030] In some embodiments, the concentrated acid tank 1 is provided with an exhaust port 4 at its top. The exhaust port 4 is independently located at the top of the concentrated acid tank 1, separate from the level gauge installation position, and is used to discharge gas inside the tank to maintain gas pressure balance.

[0031] In some embodiments, the concentrated acid tank 1 has an acid replenishment port 5 at its top.

[0032] In some embodiments, the bottom of the concentrated acid tank 1 is provided with an acid discharge port; the acid discharge port is connected to an external dilute acid cylinder 7 via a magnetic pump 6.

[0033] In some embodiments, the system further includes a controller that receives a level gauge signal; the controller has preset upper and lower limits for the level and determines whether to trigger an alarm based on the signal.

[0034] As the improved technical solution of the present application, it further comprises an alarm, which alarms according to the alarm signal triggered by the controller; the alarm has two, which are respectively arranged at the post room and the acid supplement tank door; the post room alarm corresponds to the alarm signal when the liquid level in the concentrated acid tank body 1 reaches the lower limit value; the alarm at the acid supplement opening 5 corresponds to the alarm signal when the liquid level in the concentrated acid tank body 1 reaches the upper limit value. Specifically, when the liquid level in the concentrated acid tank body 1 reaches the lower limit value, the post room alarm is triggered; when the liquid level in the concentrated acid tank body 1 reaches the upper limit value, the alarm at the acid supplement opening 5 is triggered.

[0035] In order to ensure the overall sealing of the device, a sealing element is arranged between the lower flange part 2-3 and the connecting surface of the reserved mounting flange. A sealing element is arranged at the connection between the upper threaded part 2-1 and the liquid level meter.

[0036] As the improved technical solution of the present application, the corrosion-resistant capacitive liquid level meter 3 comprises a probe and a transmitter; the probe adopts a stainless steel probe rod coated with full polytetrafluoroethylene PTFE; the probe is connected with the transmitter, and the connecting joint part of the two adopts a Hastelloy or titanium alloy material. The transmitter is connected to the controller through a signal cable, converts the liquid level signal detected by the probe into a 4-20 mA standard current signal, and transmits it to the controller, which is used for liquid level display, upper and lower limit judgment and alarm triggering. Embodiment 1

[0037] A concentrated acid tank with a protection function for a ceramic filter, in particular: I. Specific components Concentrated acid tank body 1: used for storing 98% concentrated nitric acid; the top thereof is provided with a reserved mounting flange for mounting an original lifting float rod liquid level meter.

[0038] Connecting component 2: a stepped variable-diameter flange adapter, which is used to realize reliable and sealed connection between the concentrated acid tank reserved mounting flange and the corrosion-resistant capacitive liquid level meter. The component is a stepped variable-diameter flange adapter, and the specific structure comprises: lower flange part 2-3: the flange plate diameter, bolt hole distribution and center hole diameter thereof are completely matched with the reserved mounting flange at the top of the concentrated acid tank, and rigid connection can be realized through bolts. Upper threaded part 2-1: an inner thread matched with the installation interface of the corrosion-resistant capacitive liquid level meter 3 is processed, which is used to tighten and fix the liquid level meter. Intermediate transition part 2-2: the intermediate transition part 2-2 is a key component for connecting the upper and lower parts, which not only forms a stepped appearance to facilitate installation operation, but more importantly, it provides a method for flexible adjustment of the overall height. Since the size of the concentrated acid tank used by each enterprise is fixed and cannot be changed, while the length of the liquid level meter exists in multiple standard specifications (for example, 630 mm, 710 mm, 1000 mm, 1500 mm, etc.), therefore, by customizing the height of the intermediate transition part 2-2, the liquid level meter most suitable for the specific site requirements can be selected.

[0039] At the same time, the sealing structure: between the lower flange part 2-3 and the connection surface of the concentrated acid tank reserved installation flange, and the connection between the upper threaded part 2-1 and the corrosion-resistant capacitive liquid level meter 3, a sealing element (polytetrafluoroethylene PTFE gasket) resistant to concentrated nitric acid corrosion is provided, realizing double sealing.

[0040] Concentrated acid tank acid level protection and control device: including corrosion-resistant capacitive liquid level meter 3, controller, alarm and so on.

[0041] Concentrated acid tank exhaust port 4: located at the top of the concentrated acid tank body 1, used for discharging gas in the tank to maintain pressure balance.

[0042] Concentrated acid tank acid supplement port 5: located at the top of the concentrated acid tank body 1, connected to the external nitric acid transport tank car, used for supplementing concentrated nitric acid to the concentrated acid tank.

[0043] Magnetic drive pump 6: located at the bottom of the concentrated acid tank body 1, one end is connected to the acid discharge port at the bottom of the concentrated acid tank body 1, and the other end is used to deliver concentrated nitric acid to each dilute acid cylinder 7.

[0044] Dilute acid cylinder 7: each ceramic filter 8 is equipped with a dilute acid cylinder 7 (containing 45% dilute nitric acid).

[0045] Ceramic filter 8: used for concentrate dewatering, using acid washing and ultrasonic cleaning method.

[0046] Concentrated acid tank acid level protection and control device: including liquid level meter, controller and alarm. Liquid level meter (corrosion-resistant capacitive liquid level meter 3): its probe uses a stainless steel probe rod coated with all polytetrafluoroethylene PTFE, which is made of 316L stainless steel as the base body, and the outer layer is completely coated with all polytetrafluoroethylene PTFE material with a thickness of ≥1mm. The connecting joint part of the probe and the transmitter adopts Hastelloy or titanium alloy material. The transmitter outputs a 4-20mA standard signal to the controller through the wire. Controller: receiving liquid level meter signal, presetting upper limit value (such as 150mm from the tank top) and lower limit value (such as 150mm from the outlet pipe), and judging whether to trigger the alarm according to the signal. Alarm: including two, respectively set in the post room and the acid supplement tank car doorway. When the liquid level reaches the lower limit, the post room alarm is triggered; when the liquid level reaches the upper limit, the alarm at the acid supplement port 5 is triggered.

[0047] II. Equipment contact principle explanation: The concentrated acid tank is connected with an external nitric acid transport tank truck through the acid supplement port 5 to supplement 98% concentrated nitric acid, and an exhaust port 4 is arranged at the top of the tank body to balance the gas pressure. The acid level inside the concentrated acid tank is monitored in real time by a corrosion-resistant capacitive liquid level meter 3, which is stably and sealingly installed on the reserved mounting flange at the top of the concentrated acid tank through a customized connecting component 2. The liquid level meter transmits the liquid level signal to the controller in the form of a 4-20 mA standard signal. The controller determines the liquid level state according to the preset upper and lower limit values, and triggers the alarm at the corresponding position to give an audible and visual warning when the limit value is reached. The magnetic pump 6 transports concentrated nitric acid from the concentrated acid tank to the dilute acid cylinder 7 matched with each ceramic filter 8 for use in the combined acid washing and ultrasonic cleaning process of the ceramic filter 8.

[0048] III. Execution of the acid level protection and control device: Liquid level measurement and setting: The original easily jammed lifting float rod is removed, and a corrosion-resistant capacitive liquid level meter 3 is installed through a customized connecting component 2 to achieve continuous, accurate, and non-contact measurement of the acid level inside the concentrated acid tank. According to the actual height of the concentrated acid tank, the safe upper and lower limit values of the liquid level are set.

[0049] IV. Automatic alarm and linkage control: When the liquid level drops to the lower limit value: the controller triggers the post room alarm to remind the operator that the acid level is insufficient and needs to contact the acid supplement; the operator can confirm the alarm cancellation through the manual button.

[0050] When the liquid level rises to the upper limit value: the controller triggers the acid supplement tank truck door alarm to remind the driver to immediately stop the acid supplement operation to prevent acid overflow.

[0051] After the method is put into use, good results have been achieved, as follows: The problem of inaccurate liquid level monitoring is completely solved: the corrosion-resistant capacitive liquid level meter 3 is stably and sealingly installed on the original interface through the customized connecting component 2, which fundamentally solves the problems of easy jamming of the lifting float rod and inaccurate liquid level display. The liquid level meter can achieve continuous, accurate, and non-contact measurement and record historical curves for easy analysis of the operating state.

[0052] Effective prevention of acid overflow and shortage accidents: based on accurate liquid level measurement, the controller can accurately set and determine the upper and lower limits of the liquid level. When the liquid level approaches the upper limit, the driver is reminded to stop the acid supplement to prevent acid overflow accidents; when the liquid level is below the lower limit, the operator is reminded to supplement the acid to avoid production interruption due to acid shortage.

[0053] Significant improvement in the intrinsic safety level of the system: the double-sealing design (customized connecting component 2 + corrosion-resistant probe) ensures long-term reliable operation in the strong corrosive environment of 98% concentrated nitric acid, completely eliminating the risk of secondary leakage caused by interface leakage or probe corrosion. The automatic alarm mechanism reduces manual intervention and reduces the risk of personnel exposure to dangerous environments.

[0054] Reduce operation and maintenance costs and improve production efficiency: The system has high automation, reduces the dependence on manual inspection, and reduces labor costs. The continuity and stability of the production process are guaranteed, and the overall production efficiency is improved.

[0055] Enhance environmental risk management capabilities: From the source, the leakage risk of concentrated nitric acid, a major hazard source, is controlled, effectively protecting the environment and reducing the possibility of environmental penalties and reputation loss for the enterprise.

Claims

1. A ceramic filter concentrated acid tank with protective function, comprising a concentrated acid tank body, wherein a level gauge mounting port is pre-set on the concentrated acid tank body, and the level gauge mounting port is provided with a reserved mounting flange; characterized in that, It also includes a connecting component and a level gauge; the level gauge is mounted on the reserved mounting flange via the connecting component. The connecting component is a stepped reducing flange adapter, including an upper threaded part, a middle transition part and a lower flange part; The upper threaded portion is provided with internal threads; The intermediate transition section extends into the concentrated acid tank; the interior of the intermediate transition section is a hollow structure. The lower flange is installed on the reserved mounting flange; The top of the level gauge is connected to the internal thread of the upper threaded part, and the bottom of the level gauge extends into the concentrated acid tank after passing through the intermediate transition part and the lower flange part; the level gauge is a corrosion-resistant capacitive level gauge. The length of the intermediate transition section is matched to the difference between the length of the selected corrosion-resistant capacitive level gauge and the internal height of the concentrated acid tank on site, so as to ensure that the level gauge is stably installed on the reserved mounting flange and that the probe of the level gauge reaches the preset measurement position in the concentrated acid tank.

2. The concentrated acid tank of a ceramic filter with protective function according to claim 1, characterized in that, The concentrated acid tank has an exhaust port at the top.

3. The concentrated acid tank of a ceramic filter with protective function according to claim 1, characterized in that, The concentrated acid tank has an acid replenishment port at the top.

4. A ceramic filter concentrated acid tank with protective function according to claim 1, characterized in that, The bottom of the concentrated acid tank is provided with an acid discharge port; the acid discharge port is connected to an external dilute acid cylinder through a magnetic pump.

5. A ceramic filter concentrated acid tank with protective function according to claim 1, characterized in that, It also includes a controller that receives liquid level gauge signals; the controller has preset upper and lower liquid level values ​​and determines whether to trigger an alarm based on the signals.

6. A ceramic filter concentrated acid tank with protective function according to claim 5, characterized in that, It also includes an alarm, which will sound an alarm based on the alarm signal triggered by the controller; there are two alarms, one installed in the guard room and the other at the entrance of the acid replenishment tanker; the alarm in the guard room is for when the liquid level inside the concentrated acid tank reaches the lower limit; the alarm at the acid replenishment port is for when the liquid level inside the concentrated acid tank reaches the upper limit.

7. A ceramic filter concentrated acid tank with protective function according to claim 1, characterized in that, A seal is provided between the lower flange and the connection surface of the reserved installation flange.

8. A ceramic filter concentrated acid tank with protective function according to claim 1, characterized in that, A sealing element is provided at the connection between the upper threaded part and the level gauge.

9. A ceramic filter concentrated acid tank with protective function according to claim 1, characterized in that, The corrosion-resistant capacitive level gauge includes a probe and a transmitter; the probe is a stainless steel probe rod fully coated with polytetrafluoroethylene (PTFE); the probe and the transmitter are connected, and the connection joint between the two is made of Hastelloy or titanium alloy.

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