FEEJOY

Feejoy Technology (ShangHai) Co.,Ltd.， established in 2004, is one of the leading manufactures in the sector of industrial measuring instrument in China. Our main products include level switches/ transmitters, temperature & pressure measuring and controlling instrument, flow meters etc. Based on the guidance of ISO 9001:2008, BV, CE, ROHS and the EXPLOSION-PROOF, Feejoy has been providing high quality products and service with professional teams. Feejoy is not the largest industrial measuring enterprise in China, but we are the most acclaimed company for the insistence on the reliability and stability of the products no matter being cheap or expensive. Meanwhile, our capability of providing specific solutions for specific needs brings us praise and awards from Sinopec, Bayer, Basf, CocoCola and so many companies all over the world. https://feejoygroup.com/

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Vibration Fork Level Switch

https://www.feejoygroup.com/product/vibration-fork-level-switch/

The vibration fork level switch is also often referred to a tuning fork level meter or a tuning fork level controller, mainly because the tuning fork level meter appears in different links in industrial production, and the actual critical role is different. The tuning fork level switch is a kind of level switch, which mainly uses the tuning fork resonance principle to measure the level status. Its unique fork design and its inherent vibration characteristics can ensure the automatic removal function.

Advantages of Vibration Fork Level Switch

 The tuning fork level switch has the characteristics of long service life, stable performance, safety and reliability, strong adaptability, no adjustment and no maintenance, and is mainly used in metallurgy, building materials, chemical industry, light industry, food and other process control industries.

 It is not affected by foam, vortex and gas, and is suitable for fixed-point alarm or control of solid material level in various silos and liquid levels in various containers.

 Features of Vibration Fork Level Switch

 Strong adaptability: The different electrical parameters and density of the tested liquid have no influence on the measurement. Harsh conditions such as scaling, agitation, turbulence, bubbles, vibration, medium viscosity, high temperature, and high pressure have no effect on the detection.

 Maintenance-free: Since the detection process of the tuning fork limit switch is completed by an electronic circuit, there are no moving parts, so once installed and put into operation, no maintenance is required.

 No adjustment required: Since the detection of the tuning fork limit switch is not affected by the electrical parameters and density of the measured medium, no on-site adjustment is required regardless of the measured liquid.

 Specification of Vibration Fork Level Switch

 We can manufacture according to customer's specification like:

Product Name

hot selling types of vibrator fork level switch

Process connection

Thread/flange/Cluck

Wetted Material

SUS304, SUS316L, SUS spray coating PTEE

Process temperature

Max 180 Deg C

Process pressure

220VAC 5A/24VDC 3A

Ambient Temp.

-20°C~70°C

Insert depth

customized

Top & Low Position Alarm

HLFS(high-level alarm); LLFS(low-level alarm)

Explosion-proof

ExdII CT6, ExdII BT4

HS code

9032899090

Typical Application of Vibration Fork Level Switch

 For solid materials, the main measurement is free-flowing medium density solid powder or granules. For example, fly ash, cement, sand, stone powder, plastic particles, salt, sugar, etc.

 For liquid materials, it mainly measures explosive and non-explosive dangerous liquids, corrosive liquids (acid, alkaline solutions, etc.), high-viscosity liquid water, acid, alkali, mud, paper pulp, dyes, oils, milk, alcohol, beverages, etc.

 The tuning fork level switch is widely used, mainly for powders and small particles with a wide density range, such as the detection of the dust inlet and outlet pipe plugging, dust collector dust level measurement, plastic, rubber powder, flour, Limit measurement of various food crops, food, chemical products, etc.

 For liquids of various properties: limit detection of various media such as slurry, viscous, easy to foam, corrosive, and so on.

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Ultrasonic Level Sensor

https://www.feejoygroup.com/product/ultrasonic-level-sensor/

Liquid level and material level measurement is a problem often encountered in the industry. Ultrasonic positioning technology has many advantages. It can not only fix points and continuous positioning, but also conveniently provide the signals required for telemetry or remote control. Compared with radioactive positioning technology, ultrasonic technology does not require protection. Compared with laser ranging technology, it has the advantages of simplicity and economy.

At the same time, ultrasonic technology generally does not require moving parts, so it is more convenient for installation and maintenance. Ultrasonic level gauges can be widely used in petroleum, mining, power plants, chemical plants, water treatment plants, sewage treatment stations, agricultural water, environmental monitoring, food (brewery, beverage industry, additives, edible oil, dairy products), flood resistance Many industries such as flood control, hydrological monitoring, open channels, and spatial position.

 Advantage of Ultrasonic Level Sensor

 Compared with laser ranging technology, it has the advantages of simplicity and economy;

 Ultrasonic technology generally does not require moving parts, so it is more convenient for installation and maintenance;

 Ultrasonic level gauge can not only fix point and continuous position, but also can conveniently provide signals needed for telemetry or remote control;

 Compared with the radioactive positioning technology, the ultrasonic level meter does not require protection.

 Technical Characteristics of Ultrasonic Level Sensor

 The transducer with strong launching power, the surface can be self-cleaned, and the use of newer transducer structure and manufacturing process has significantly improved the working performance of the transducer.

 Microprocessor program control and intelligent signal processing technology can realize a variety of typical working conditions software processing mode so that the level gauge can adapt to complex working conditions such as solids, liquids, dust and so on.

 Infrared remote control programming and adjustment, simple and reliable operation, and with LCD on-site display.

 Non-contact continuous measurement, reduce maintenance;

 It can be used to measure the level, space, distance, and can also be used for automatic liquid level-volume conversion of standard or special switch liquid tanks;

 Liquid crystal display with backlight can be displayed according to standard engineering units.

 Specification of Ultrasonic Level Sensor

Product Name

ultrasonic level sensor

Material

Sus304/316

Working Pressure

1Mpa

Process temperature

-40°C~400°C

Working pressure

-0.1Mpa~400MPa

Process Connection

<0.02%/°C

Working Voltage

thread, flange

Output Signal

two-wire, material radar fule level transmitter with 4-20mA output

Explosion Grade

Exia llC T6/IP68

Application

Fuel Level Sensor

Features of Ultrasonic Level Sensor

 The maximum range is up to 40m and the solid level measurement is up to 25m.

 The minimum resolution is 1mm.

 LCD / LED large display screen.

 Intelligent signal processing technology.

 All plastic anti-corrosion shell: protection grade IP67.

 Patented transducer structure: When the flange of the small-scale level gauge is installed, there is no requirement for the flange connection length.

 Simple key setting parameters: no need to wait for the container to empty or fill up, no need for additional remote control.

 Flexible installation method: thread (flange), fixing hole (bracket).

 The probe can be lengthened: it is suitable for the installation of outdoor closed containers in cold areas to prevent frost.

 Equipped with high and low double relays: four-wire system provides this function.

 AC and DC power supply options: four-wire system and split machine host provide this function.

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Temperature Transmitter

https://www.feejoygroup.com/product/temperature-transmitter/

Best Quality Temperature Transmitter Manufacturer

The so-called temperature transmitter is a device that converts thermal resistance, thermocouple, resistance and millivolt signals into a standard two-wire system 4 ... 20mA and transmits the signal to the control room. Also named as the thermocouple temperature transmitter, It is generally used in industrial sites. When the range of the traditional temperature transmitter needs to be changed, it is generally adjusted by zeroing and adjusting two potentiometers, but these two potentiometers are the culprits that cause a large temperature drift of the product. Not only produce products, we also provide solutions to technical problems, even in the earliest stages of the project.

Development of Temperature Transmitter

 With the advancement of science and technology, due to the tedious debugging of traditional analog temperature transmitters and poor comprehensive performance indicators, they can no longer meet the needs of on-site users, nor can they meet the requirements of factory spare parts, nor can they meet the needs of temperature sensor manufacturers’ demand.

 Therefore, the intelligent transmitter was born. One of them is to use CUP in the product, digitize the signal, and install special software on the PC during debugging, and use the data cable and modem to change the range of the temperature transmitter. And the index number; the other is to embed the HART communication board in the intelligent product itself, and change the temperature range and index number of the temperature transmitter through the HART protocol hand-held manipulator; there are two types of PA protocol and FF protocol respectively The temperature transmitter is similar to the HART protocol. The application of HART, PA, and FF communication protocols is more convenient for product programming (no limit location), but it will increase the price of the product itself and bring a burden to the owner.

 Traditional temperature transmitters, PC programming temperature transmitters and HART programming temperature transmitters are the choices of most factories. However, after these methods have been used on the site for many years, users often hear that the debugging is too cumbersome. It is impossible for every worker to be equipped with a PC, and even if there is a PC, it may not be used because the debugging software of each manufacturer is not uniform and is cumbersome; Many factories are not equipped with HART Communicator, transmitters often need to adjust the range is not very convenient. So is there a product that can change this situation?

 Advantages of Temperature Transmitter

 From the visit to the idea to the trial production, after nearly 30 months, the product finally passed the assessment of various indicators, especially the lightning protection and pulse train experiments are very good; it also meets the supporting needs of on-site users and temperature sensor manufacturers; Even the intelligent product is easy to operate. It only needs a screwdriver to change the range of the dial switch, and the temperature transmitter has been micro-innovated.

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Mini Pressure Transmitter

https://www.feejoygroup.com/product/mini-pressure-transmitter/

Mini pressure transmitter is a device that converts pressure into pneumatic signal or electric signal for control and remote transmission. It can convert physical pressure parameters such as gas and liquid sensed by the load cell sensor into standard electrical signals (such as 4 ~ 20mADC, etc.) to supply secondary instruments such as indicating alarms, recorders, regulators for measurement and indication. And process regulation.

Features of Mini Pressure Transmitter

 Mini pressure transmitter uses a high-performance pressure-sensitive chip, combined with circuit processing and temperature compensation technology, to convert the pressure change into a linear current or voltage signal.

 The product is small in size and easy to install. It adopts a stainless steel shell for isolation and corrosion protection.

 It is suitable for measuring gases and liquids that are compatible with the materials of the contact parts.

 It can be used to measure gauge pressure, negative pressure and absolute pressure.

 Application of Mini Pressure Transmitter

 Mini pressure transmitter can be used for various industrial automatic control environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemical, oil wells, power, ships, machine tools, pipelines and many other industries.

 Working Process of Mini Pressure Transmitter

 A pressure transducer often called a pressure transmitter, is a transducer that converts pressure into an analog electrical signal. Although there are various types of pressure transducers, one of the most common is the strain-gage base transducer.

 The conversion of pressure into an electrical signal is achieved by the physical deformation of strain gauges which are bonded into the diaphragm of the pressure transducer and wired into a wheatstone bridge configuration. Pressure applied to the pressure transducer produces a deflection of the diaphragm which introduces strain to the gages. The strain will produce an electrical resistance change proportional to the pressure.

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RF Admittance Level Switch

https://www.feejoygroup.com/product/rf-admittance-level-switch/

The RF admittance level switch uses more advanced RF admittance technology to replace capacitance measurement, which solves the problem of material adhesion. Compared with other similar products, it has higher system stability and can work reliably even under extremely harsh field conditions. And it is not affected by the hanging material, temperature, pressure, density, humidity, and even the chemical properties of the material. It has reliable performance and is widely used for the level measurement of ash powder, mortar, cement clinker, coal powder and other media.

Features of RF Admittance Level Switch

 It can measure the liquid level and material level, and can meet the measurement requirements of different temperatures, pressures, and media.

 It is not affected by the sensor hanging material and does not need to be cleaned regularly to avoid wrong measurement.

 There are no moving parts in the measurement process, and there is no problem with damage to mechanical parts.

 No maintenance, intelligent adjustment-free.

 Contact measurement, strong anti-interference ability, can overcome the influence of steam, foam and stirring on the measurement.

 The measurement quantity is diversified, which makes the measurement more accurate, the measurement is not affected by environmental changes, and the stability is high.

 Reliable product performance and long service life.

 Specification of RF Admittance Level Switch

 We can manufacture according to customer's specification kike below:

Product Name

radio frequency admittance fuel level controller

Wetted part Material

SUS304 and SUS 316L

HS Code

9032899090

Working Pressure

Max 3.0 MPa

Process temperature

Max 800 deg c

Output

DPDT relay(double-pole double-throw)

Contact Capacity

220VAC, 5A-no sense, 3A-sense

Response Time

0.2 S(standard)

Delay Time

0.2~90(adjustable)

Explosion-proof Grade

Explosion-proof: dIIBT4~T6

Process connection

thread/ flange, etc

Application of RF Admittance Level Switch

 Conductive and insulating liquids: Chemical industry, oil field, water and sewage treatment

 Conductive and insulating paste: Paper, pharmaceutical, water and sewage treatment

 Powder: Ash, powder, Power plant, metallurgy, cement

 Particles: coal, grain power, plant, metallurgy, grain

 Interface: two different liquids, oil field, chemical industry

 The RF admittance level switch is the RF admittance level meter, and the potentiometer W1 of the radio frequency admittance level meter is a sensitivity adjustment potentiometer: the LED two-color display lamp lights in green when there is no material, and the red light when there is one. After the meter is powered on, the green light is on when the level is lower than the set value.

 At this time, slowly adjust the potentiometer W1 clockwise until the red light is on, and then adjust it 3 times counterclockwise (0.5 to 3 times for non-conductive materials, conductive material 5 ~ 7 circles) and the green light is on (the status of the output relay's contacts should change with the change of the traffic light display state). According to the measurement part of different media sensors, it should be covered by materials at about 75mm.

[feejoygroup]

Rotary Paddle Level Switch

https://www.feejoygroup.com/product/rotary-paddle-level-switch/

The rotary paddle level switch uses a micro motor as the driving device. The drive shaft is connected to the clutch. When the material is not in contact, the motor runs normally. When the blade contacts the material, the motor stops rotating. The detection device outputs a Contact signal, at the same time cut off the power and stop rotating.

Working Principle of Rotary Paddle Level Switch

 When the level drop detection blade is no longer blocked, the detection mechanism relies on the spring tension to restore the original state. First, a micro switch acts, turning on the motor power to make it rotate. Then another micro switch action sends out no material signal, as long as there is no material blocking the rotation of the monitoring blade, this state will continue.

 After the AC micromotor is decelerated, the monitoring blade is rotated slowly. When the material level rises and the rotation of the blade are blocked, the detection mechanism generates a rotational displacement around the main shaft. This displacement first causes a micro switch to act, sending out a signal of material. Then another micro switch acts, cutting off the power of the micro motor to stop it from rotating. As long as the material level in the warehouse remains unchanged, this state will continue to be maintained.

 Specification of Rotary Paddle Level Switch

 We can manufacture according to customer's specification like:

Product Name

Rotary paddle level switch

Material

stainless steel 304, 316

Color

black and red

Power supply

24VDC/220VAC

Process connection

2-1/2" x 5kg flange or others customized

Process temperature

-20-80℃

Rod length

1m standard length or other customized

Installation

vertical or horizontal mounted

Contact capacity

SPDT 5A/250VAC

Blade Rotate Speed

1RPM

Torque

10kg/cm

Suitable Gravity

≥0.4g/cm3

Power

3W

Protect Grade

IP65

Installing Rotary Paddle Level Switch

 In the process of using the rotary paddle level switch, in order to achieve a safe and reliable effect, the following points need to be noted when installing the rotary resistance level switch:

 Before installation, first confirm whether the model of the rotary resistance level switch meets the environmental requirements of the site, such as pressure, temperature, medium, etc., to ensure that the rotary resistance level switch can be used normally after installation.

 Before installation, confirm that the power supply voltage is the same as the voltage marked on the nameplate.

 According to the density of the measured medium, choose the best blade shape.

 In order to ensure the safety of life and avoid damage to the rotary resistance level switch, because the wiring is disconnected.

 During horizontal installation, the switch can be installed at an angle of 15-20 degrees horizontally to avoid the impact of the feed and try to avoid the feed port.

[feejoygroup]

Pressure Transmitter

https://www.feejoygroup.com/product/pressure-transmitter/

Best Quality Pressure Transmitter Manufacturer

The pressure transmitter is a device that converts pressure into pneumatic signal or electric signal for control and remote transmission. It can convert physical pressure parameters such as gas and liquid sensed by the load cell sensor into standard electrical signals (such as 4 ~ 20mADC, etc.) to supply secondary instruments such as indicating alarms, recorders, regulators for measurement and indication. And process regulation. Our engineering team uses current reliable sensing technology and lean production principles to manufacture economical pressure level transmitter products, which can even overcome the most trivial industrial application problems.

Application of Pressure Transmitter

 Pressure transmitter is the most commonly used smart pressure sensor in industrial practice. The standard pressure transmitter is widely used in various industrial automatic control environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemical, oil wells, power, ships, Machine tools, pipelines, and many other industries.

 The industrial pressure transmitter can be divided into force (torque) balanced type, capacitive type, inductive type, strain type and frequency type according to different conversion principles. The following briefly introduces the principles, structure, Knowledge of use, maintenance, and calibration.

 Working Principle of Pressure Transmitter

 The electronic pressure transmitter is composed of a measuring diaphragm and electrodes on both sides of the insulating sheet to form a capacitor. When the pressure on both sides is inconsistent, the displacement of the measuring diaphragm is caused, and the displacement is proportional to the pressure difference, so the capacitance on both sides is unequal, through oscillation and demodulation.

[feejoygroup]

Radar Level Transmitter

https://www.feejoygroup.com/product/radar-level-transmitter/

The radar level transmitter adopts the microwave pulse measurement method, and can be normal in the industrial frequency band range, the beam energy is low, can be installed in various metal, non-metallic containers or pipelines, the liquid, slurry and granular material level Perform non-contact continuous measurement. It is suitable for occasions with large changes in dust, temperature and pressure, and the presence of inert gas and steam.

Advantages of Radar Level Transmitter

 Today's high-frequency radars are generally radar level gauges that operate in the K-band (24-26 GHz).

 The higher the radar's operating frequency, the shorter the electromagnetic wave wavelength. The easier it is to have better reflections on inclined solid surfaces The narrow beam width can effectively avoid obstacles, and the high frequency can also make the radar using a smaller antenna.

 The FMCW FM continuous-wave microwave level meter transmits and receives signals at the same time, and more microwave signals are emitted at the same time.

 The solid wave measurement can reduce the wave loss phenomenon in the measurement of high dust solid silo.

 Therefore, the solid-state mid- and high-frequency FM radar can provide accurate and reliable measurements, and is also well used in media such as PP powder and PE powder in the chemical industry. However, due to technical limitations, there is currently no high-frequency radar level gauge that works above the K band.

 Specification of Radar Level Transmitter

 The specification can according to your requirement to do:

Product Name

radar level sensor

Material

Sus304/316

Type

Meter

Application

Fuel Level Sensor

Power supply

24VDC/220VAC

Output

4~20mA

Measuring Range

70m

Accuracy

3mm

Sensor type

rod

Certificate

ISO9001

Radar Level Transmitter Used in Some Large Solid Silos

 Nowadays, what troubles users in the field of level measurement is the level measurement of some large solid silos, especially for silos that are filled with dust and disturbance within 50/100 meters. Related technical instruments such as capacitors or guided wave radar TDRs will be subjected to strong tensile loads when the material level drops during unloading, which may damage the instrument or pull down the roof of the silo.

 Heavy hammers often have problems with buried hammers and require frequent maintenance, as do most other mechanical instruments. The high dust conditions may exceed the capabilities of the non-contact ultrasonic level measurement system. High-frequency FM radar technology is especially suitable for level measurement of this large solid silo.

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Pneumatic Product

https://www.feejoygroup.com/product/pneumatic-product/

Best Quality Pneumatic Product Manufacturer

Pneumatic hammer is an advanced powder falling device commonly used at home and abroad. It has been improved many times and many new varieties have been derived. The pneumatic products are novel and unique. It is used to automatically prevent the adhesion, clogging and bridging of powder in the pipeline, hopper and silo transportation, and it will not cause operation and deformation on the wall of the equipment, glass, cement, pharmaceutical, plastic, fuel and other powder processing industries. We have a professional team to provide assistance in mechanical engineering, electrical engineering, product design and analysis.

Pneumatic Product Types

Pneumatic Air Hammer

The advantage of the pneumatic hammer is that its striking strength is adjusted by adjusting the air supply pressure.

Pneumatic Vibrator

The working part of the vibrator is a rod-shaped hollow cylinder.

Introduction to Pneumatic Hammer

 In a state where compressed air (more than 3Kg / cm) is not introduced into the pneumatic hammer, the magnetic piston is tightly fixed to the base plate with strong magnetic force. When the three-way solenoid valve is energized, compressed air flows into the pneumatic hammer body, and the pressure in the body increases. When the magnetic force is greater than the magnetic force, the magnetic piston detaches from the base plate at high speed, resulting in a strong counterforce due to the reaction force of strong magnetic force. The magnetic piston falling at high speed hits the substrate, and its impact force is transmitted to the silo, and the attached dust is knocked down with a strong impact force. When the three-way solenoid valve stops energizing, the compressed air in the pneumatic hammer body is discharged through the three-way solenoid valve, so the magnetic piston is slowly raised by the return spring and then close to the substrate, which is restored to the original state by the magnetic force.

 There is a strong magnetic magnet inside the hammer head. Before the action, the magnetic hammer head is closely attached to the magnetic substrate. When the three-way solenoid valve is energized and the intake pressure is greater than the applied magnetic force, the magnetic hammer head is separated from the substrate at high speed and impacts the bottom After the impact, the three-way solenoid valve is powered off, the gas in the pneumatic product is eliminated, and the hammer head is reset. The impact force of the pneumatic air hammer is transmitted to the wall of the pipe or the barrel so that the material can flow smoothly. Widely used in powder processing industries such as chemical, fertilizer, pesticide, cement, fuel, etc..

Manufacturing Materials for Pneumatic Vibrators

 There are many manufacturing materials for pneumatic vibrators, including carbon steel, cast iron, aluminum alloy, bronze, stainless steel and extruded aluminum. For applications in special environments, such as the pharmaceutical industry, the housing can be made of aluminum or stainless steel. Its vibration frequency and vibration strength can be accurately controlled by adjusting the flow and compressed air pressure (stepless adjustment). Its main advantages and uses include:

 1. Only compressed air is needed as a power source, and the gas consumption is small, which is safe and energy-saving. It is an ideal device for use in freezing or high temperature environments, and is suitable for wet, dry, dusty, or explosive environments.

 2. Small size, few failures, easy installation and maintenance.

 3. Stop or start quickly, suitable for manual or automatic system.

 4. Vibration force, vibration frequency and amplitude can be adjusted at will during the movement.

 5. A wide range of applications, suitable for fatigue testing of parts or structural parts; jitter and compaction of hoppers; linear and bowl feeders, sieves and strainers; shakers and mixing equipment

 6. The service life of most types of pneumatic vibrators is relatively low.

[feejoygroup]

Mini Float Level Switch

https://www.feejoygroup.com/product/mini-float-level-switch/

The Mini float level switch is a simple and easy-to-use liquid level control element. It has no complicated circuits and will not be disturbed. As long as the material is selected correctly, any nature of liquid, pressure, and temperature can be used.

Features of Mini Float Level Switch

 Lightweight, simple working principle, high reliability and low price.

 More than 30 kinds of floats with different materials and specifications are available.

 Provide PP, PVDF, NYLON, POLYSULFONE and other plastic materials that can be acid and alkali resistant.

 Stainless steel material SUS 304/316 temperature resistance up to 200 ℃; pressure resistance up to 6MPa.

 Side-mounted, top-mounted and bottom-mounted are available. The mouth size is M8 ~ M16, 1/8 "~ 1/2", PF / PT / BSP, etc.

 The wire is wire or cable, and the material is PVC, XLPE, PTFE.

 Special specifications can also be customized.

 Specification of Mini Float Level Switch

 We can manufacture according to customer's specification like below:

Product Name

Mini Float Level Switch

Contact Capacity

AC220V/1A;DC24V/0.5A

Working Pressure

≤3.0MPa

Output Signal

SPST NO/NC

Working Temperature

-20~130°C

Protection Grade

IP68

Connection

3/8″PF (OEM is available)

Wire Length

500±10mm

Installation Method

vertical installation

Explosion-proof

No

Connection

3/8″PF (OEM is available)

Installation Method

vertical installation

Application of Mini Float Level Switch

 In the fields of sewage treatment water purification, refrigeration equipment, water coolers, drinking fountains, water boilers, dishwashers, household and commercial electric water heaters, chemical liquids, etc., the liquids in containers such as sealed containers, storage tanks, open containers, and pools are separately carried out, the signal is transmitted remotely, on-site indication, liquid level monitoring, the liquid level is controlled by controlling the start and stop of the pump or the switch of the valve, or the high and low liquid level alarm.

 The float is close to or away from the switch point in the rod body under the action of liquid buoyancy. When the float is close to the switch point, the magnetic steel in the float is also close to the dry reed pipe in the rod body. The contacts of the dry reed pipe are closed under the action of the magnetic force. On the contrary, when the float is far away from the switch point, the magnetic steel in the float is also far away from the reed switch in the rod body, and the contacts of the reed switch are disconnected due to the loss of magnetic force.

 Normally closed (N.C) when the liquid level rises, the reed switch does not conduct.