Category Archives: Magnetic Float

Float Level Sensors – Single and Multipoint

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Float level sensor is a kind of continuous liquid level measurement sensor. Also called float level switch, float level gauge, float level transmitter.

Float Level Sensors - Single and Multipoint

Float level sensors are continuous level sensors. It can display the liquid level percentage, 4~20mA current and liquid level value on the spot. Output the switching value signal to conduct liquid Bit switch control. Low-cost. Single-point or multi- point measurement and control optional.

Sino-Inst offers a variety of Float level sensors for industrial level measurement. If you have any questions, please contact our sales engineers.

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More Level Sensors

Featured Float Level Sensors & Switches

SI-U01 Float Level Sensor
SI-U02 Multi-Point Liquid Level Float Switch
SI-U03 Float Switch Water Level Controller
SI-U04 Magnetic Float Level Sensor-Reed Switch
SI-U05 Cable Float Level Sensor & Swtich

What is float level sensor?

Float level sensor uses magnetic float as the measuring element. Through magnetic coupling, the internal resistance of the sensor changes linearly. The smart converter converts the resistance change into a 4-20mA standard current signal. It can display the percentage of liquid level, the current of 4 ~ 20mA and the value of liquid level. Remote transmission control room can realize automatic detection, control and recording of liquid level. This instrument is suitable for petroleum, chemical, power, light industry and pharmaceutical industries, such as sewage treatment and medium level measurement in various atmospheric and pressure vessels, especially for underground tanks and tanks.

Float level sensor working principle

Float level meter is an instrument for measuring liquid level. It is widely used in the field of liquid measurement. Many industries will choose to use it for measurement equipment. Such as the petroleum, chemical, and pharmaceutical industries.

Float level sensor: Float level sensor is designed and produced based on the principle of buoyancy and static magnetic field. The position of a floating ball with a magnet (floating ball for short) in the measured medium is affected by buoyancy. The change of the liquid level causes the position of the magnetic float to change. The role of the magnet and sensor (reed switch) in the floating ball changes the number of components (such as fixed resistance) connected in series to the circuit. Thereby changing the electrical quantity of the instrument circuit system. That is, changes in the position of the magnetic float cause changes in the electrical quantity. The change of the electrical quantity is detected to reflect the liquid level in the container.

The float level sensor is installed on the top of the container through a connection flange. The float ball floats on the liquid surface according to the principle of discharging the liquid volume phase and so on. When the liquid level of the container changes, the float ball also moves up and down. The reed switch of the ball level gauge is magnetically attracted to change the position of the liquid level into an electrical signal. The actual position of the liquid is displayed digitally by the display instrument. The floating ball level gauge can achieve long-range detection and control of the liquid level.

Float level sensor advantages and disadvantages

Advantages

  • Long life span, stable and reliable operation, easy installation, almost no maintenance
  • None influence of measured medium in physical and chemical state. Eg: medium electrical conductivity, dielectric constants, foam, pressure, temperature, evaporation, boiling, bubbling effect etc, .
  • Choose appropriate material can be used in a variety of bad media environment with densities ≥ 0.5G/CC ;
  • Interface measurement with two media of different density control;
  • Wide range of application. Pressures from vacuum to PN160 (special up to PN320), temperature -40~+150 ° c
  • Design, explosion-proof, suitable for explosive environments;
  • Controller can be used to control the upper and lower liquid level.

Disadvantages

  • Low accuracy.
  • The installation position is limited by the shape of the container.
  • Most float level gauges are not suitable for corrosive or hazardous liquid media.

Many users are consulting float ball level timing and often confuse it with float ball level switches and float ball level controllers.
But they are not the same product, and the functions and prices differ greatly.
If they are mixed, it will cause the impression that some of them are sold abnormally and some of them are extremely low in price.
So, what are the differences between float level gauge, float level switch and float level controller?

What is a liquid level switch?

The float level switch uses magnetic force to operate. There is no mechanical connection. The operation is simple and reliable.

The magnetic float of the float level switch is used to rise or fall with the liquid level, so that the reed switch chip at the set position in the sensor detection tube is activated, and the contact open (close) conversion signal is issued.

One or more Reed tubes are installed in the sealed non-magnetic tube. Then the tube is passed through one or more hollow floating balls with ring magnets inside. The rise or fall of the liquid will move the floating balls up and down together. Thereby, the reed switch in the non-magnetic conductive tube is attracted or disconnected, thereby outputting a switching signal.

More about: 😉Liquid level float switch technology|continuous-point level

More about Float switch From Wikipedia.

Level switch working principle

The Cable Float Level Switch is with simple structure of using micro switch or proximity switch or reed switch to control the contact. And it is user friendly design for level measurement. The switches will send out ON or OFF contact signal output. The floating angle is larger than a certain degree. Then the state of the iron ball and reed switch will be changed for actuation. For wastewater and applications at different temperatures, the material of the float can be selected from plastic to stainless steel. Cable float level switch controls long distance and multi-point contact detection. Cable float level switch can be used for transparent liquid and granular liquid industries.

The Multi-Point Liquid Level Float Switch operates magnetically, without mechanical connections. And it is simple and reliable. When the floating ball switch measures the floating medium of the test medium, the float moves the main body. And at the same time, the magnet on the other end of the float will control the magnet on the switch operating lever.Set one or more reed switches in a closed metal or plastic tube. And then pass the tube through one or more, hollow and floating ring with ring magnet inside. And use the fixed ring to control the floating ball and the magnetic spring. The switch is in the relevant position, which makes the float float up and down within a certain range. The magnet in the float is used to attract the contacts of the reed switch, which generates the opening and closing action.

Frequently
Asked
Questions

Help Center

The float level switch is a kind of level switch. The float level switch uses magnetic force to operate. No mechanical connections. The operation is simple and reliable. When the float switch floats the measured medium, the float moves the main body. At the same time, the magnet on the other end of the float will control the magnet on the switch action lever.

Continuous liquid level sensors provide continuous liquid measurement and provide accurate liquid levels in tanks/vessels at all times.

Typical applications that require continuous liquid level sensors are. In some processes, understanding the liquid level is critical, or in some processes, high accuracy is essential. Such as process control or inventory control and management.

Examples that can be used as continuous level sensors:
Optical Level Sensor; Submersible Level Sensor; Ultrasonic Level Sensor

The float level detector is used to measure liquid levels in a tank in which a float rests on the surface of the liquid and follows the changing level of the liquid.

Ultrasonic Level Indicator, also called Ultrasonic level sensor, or ultrasonic level transmitter. In this type of transmitter, an ultrasonic transducer is mounted at, or near the top of a container containing liquid. The transducer sends out an ultrasonic pulse. The pulse hits the surface of the liquid, and gets reflected. The sensor then calculates the fill level based on the time between the transmitted and received signal.
Extended reading: Ultrasonic Level Switch-External Mounted

Common liquid level sensors are:
Float type liquid level sensor, magnetostrictive liquid level sensor,
Capacitive liquid level sensor, resistance liquid level sensor,
Radar level sensor, laser level sensor,
Ultrasonic liquid level sensor, pressure sensor,
Bubble level sensor, isotope level sensor,
Thermodynamic liquid level sensor
Therhere are 7 main types of level transmitters that Sino-Instroffers. Each type of transmitter works in a different way, and makes it useful for different types of processes.

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Sino-Inst offers over 10 Float Level Sensors – Single and Multipoints for level measurement. About 50% of these are float liquid level meters, 40% is the level switches.

A wide variety of Float Level Sensors – Single and Multipoints options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Float Level Sensors – Single and Multipoint instrumentation, located in China.

Request a Quote

SI-U05 Cable Float Level Sensor & Swtich

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Cable Float Level Sensor (Float level switch) for water/level switch control.

Cable Float Level Sensor (Float level switch) is a high performance level control switch. It can control the work of the liquid pump, adjusting the liquid level. And it can also be installed in the submersible pump to control and protect the motor. High sealing performance is guaranteed by polypropylene injection. It is a switch that can adjust the liquid level in a bucket, tank or well. Cable Float Level Sensor is self-adjusting, easy to operate, easy to install and maintenance-free. It has a resistance to sewage. It is used in mines, oil, irrigation containers, etc.

Please feel free to contact us for Techinical Support, or Request a quote for float level sensors (customization available).

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More Float Level Sensors

The Cable Float Level Switch is designed using the principles of gravity and buoyancy. Cable Float Level Sensor has a simple and reasonable structure. Including: A floating body. A large-capacity miniature switch set in the floating body.

A driving mechanism capable of turning the switch on and off. And a three-core cable connected to the switch. The outstanding feature of this product is its stable and reliable performance. Cable Float Level Sensor has no malfunction caused by the fluctuation of the liquid surface.

At the same time, it has the characteristics of convenient installation, low price and long service life. This product can be used with various liquid pumps, and automatic control of water levels in water supply, drainage and rotten liquids.

Features of SI-U05 Cable Float Level Sensor

Cable Float Level Sensor can be matched with various liquid pumps. And is widely used for automatic control of water levels in water supply, drainage and corrosive liquids.

  1. Simple construction.
  2. Reliable performance. The product can send switch control signals under normal conditions. Strong reliability.
  3. Durable and long life. 
  4. Easy installation method. Convenient adjustment method. Adjustable water level control range. 
  5. Simple circuit. Economical and practical operating voltage 220v. Current 10A. Simple circuit and low cost.
  6. Resistant to corrosion.

Specifications of SI-U05 Cable Float Level Sensor

Float Materia:PP, SUS304
Contact Capacitance: 10A/250VAC(PP),2A/250VAC(SUS304)
 Contact type: 1A,1B or 1AB(PP),SPDT(SUS304)
 Cable specification: Rubber cable and PVC(PP),Silicone:0.75mm2×3C(SUS304)
 Suitable temperature: Rubber cable: -10℃~80℃,PVC cable:0℃~60℃,Silicone: 0~170℃
 Gravity: >0.6g/cm3(PP),>0.5g/cm3(SUS304)
Lead length: 2m 3m 4m 5m 10m, etc.
Other lengths can be customized
Applicable medium:Clean water, sewage, oils and acid-base liquids below medium concentration

Applicaitons of Cable Float Level Sensor & Swtich

  • Water level monitoring
  • Tank level control
  • High or low level alarm
  • Municipal water control
  • Industrial water control
  • Filling or draining reservoirs and tanks
  • Pump automation
  • General pump control
  • Pump control in wastewater
  • Suitable for low specific gravity materials
  • Can handle high operating temperatures
  • Clean fluids with small process connections
  • Water and wastewater
  • Petrochemical
  • Chemical

Extended reading: Ultrasonic Level Switch-External Mounted

Working Principle of Float Level Sensor

The Cable Float Level Switch is with simple structure of using micro switch or proximity switch or reed switch to control the contact. And it is user friendly design for level measurement. The switches will send out ON or OFF contact signal output. The floating angle is larger than a certain degree. Then the state of the iron ball and reed switch will be changed for actuation. For wastewater and applications at different temperatures, the material of the float can be selected from plastic to stainless steel. Cable float level switch controls long distance and multi-point contact detection. Cable float level switch can be used for transparent liquid and granular liquid industries.

Float Level Sensor Installation

  1. Pass the wire of the float switch from the concave circle of the center of the weight. Push the weight gently to make the plastic ring embedded above the round hole fall off due to the thrust of the wire head. You can also use a screwdriver to remove this plastic ring. Then put the dropped plastic ring on the cable to set the water level by the weight you want.
  2. Gently push the weight to pull out the cable until the center of the weight holds the plastic ring. As long as the heavy hammer is lightly buckled in the plastic ring, it will not slip. If the plastic ring is damaged or lost, it can be replaced with a light bare copper wire into the cable.
  3. Please pull the cable directly to the control box. Avoid using the intermediate connector as much as possible. If there is a connector as a last resort, never immerse the cable connector in the water.
Image source: https://instrumentationtools.com/cable-float-level-switch-working-principle/

Other types of Float Level Switches

SI-U01 Float Level Sensor
SI-U02 Multi-Point Liquid Level Float Switch
SI-U03 Float Switch Water Level Controller
SI-U04 Magnetic Float Level Sensor-Reed Switch

Liquid level float switch is a commonly used liquid level controller. For water Tank & Pump alarm and level control. Can be divided into Continuous Float Level Sensor and Point Level Float Switch. Read more about Guide for Liquid level float switches.

Q&A

The float level switch is based on the principle of buoyancy. The float ball moves a distance with the liquid surface, and this movement plays a limit role. A magnetic floating ball is used to generate a switching action with a reed switch, output a switching signal, and then control the liquid level through wiring.

The float level switch only needs to re-calibrate the water level line before we install it. The switch itself cannot be adjusted. At this time, use a multimeter to measure the switch state, and it will be turned on and off with the water level near the waterline, which means that there is no problem. Just make sure that the water level line of the thermal equipment is consistent during the installation. For example, the liquid level switch of SOR is generally attached to the water level line on the wall of the cylinder. We soak the switch in the water tank and slowly sink, so that the water surface gradually approaches the marking line. When it is closest, we will hear the micro switch action the sound of.
It should be noted that the working temperature of the high-level liquid level switch is high, and the water temperature inside is also high; the density of high-temperature water is less than that of room temperature water. Therefore, the action line of room temperature water is lower than the switch identification line.
Low level alarm is connected to normally closed (NC), high level is connected to normally open (NO). This type of switch is not difficult to install. The liquid level switch itself will have more than two pairs of micro-switches, which respectively output two pairs of normally open and two pairs of normally closed contacts, which are usually “on alarm” when applied.

The liquid level sensor converts the liquid level signal in the container into a switching signal or a voltage and current signal, and then through an external circuit, allows the surveyor to accurately know the liquid level in the container.
There are 7 main types of level transmitters that Sino-Instrument offers. Each type of transmitter works in a different way, and makes it useful for different types of processes.

Level Transmitters

Liquid level switch, also known as water level switch, liquid level sensor. The liquid level switch is a switch used to control the liquid level. It is mainly divided into contact type and non-contact type. Capacitive liquid level switches are commonly used in non-contact switches. And contact float type liquid level switches are most widely used. Electrode level switches, electronic level switches, and capacitive level switches can also be implemented using contact methods.

There are currently 6 medium level switches:

  1. Float level switch: The magnetic float of the float level switch rises or falls with the liquid level. So that the sensor detects the position of the reed switch chip in the tube, and sends a contact on / off switch signal. Because of its simple structure and economic benefits, it is widely used in the market, mainly for civilian use. But its stability is relatively poor compared to industrial-grade products.
  2. Capacitive liquid level switch: After the probe is wetted, it detects the change in capacitance value and outputs a contact signal, which has certain advantages in the measurement of slightly viscous media.
  3. Electrode type liquid level switch: The electrode type liquid level switch uses the conductivity of the liquid to detect the level of the liquid. Once the measured medium touches the pole, it will conduct electricity and detect the signal. After the signal of the controller is amplified, a contact signal is output to realize the control of the liquid level.
  4. The photoelectric liquid level switch: The photoelectric liquid level switch uses infrared detection, using the principle of refraction and reflection of light. The reflection or refraction of light at the interface between two different media. When the measured liquid is at a high level, the measured liquid forms a kind of interface with the photoelectric switch. When the measured liquid is at a low position, air and the photoelectric switch form another interface. These two interfaces make the intensity of the reflected light received by the light receiving crystal inside the photoelectric switch different. That is, correspond to two different switching states. Generally speaking, compared with other measuring instruments, the applicability of photoelectric switches is poor.
  5. Tuning Fork Liquid Level Switch: It outputs a switch signal by detecting the change in the frequency and amplitude of the fork’s vibration, which is highly versatile. For the viscous working conditions, please consult with the manufacturer to determine the working conditions that are easy to crystallize.
  6. Ultrasonic external liquid level switch: The instrument probe emits ultrasonic waves and detects its residual vibration signal in the container wall. When liquid passes through the probe, the amplitude of this aftershock signal becomes smaller. This change is detected by the meter and outputs a switching signal. It is a non-contact type and is often used in high-risk situations where it is difficult to open holes on the site, but the cost is relatively expensive.

Techinical Support

Sino-Inst is float level sensor manufacturer. On the premise of ensuring product quality, we offer you the best price.


Sino-Instrument offers over 10 level transmitters for level measurement.

About 50% of these are liquid level meters,

40% is the tank level sensor.

A wide variety of level meters options are available to you,

such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of level measurement instrumentation, located in China.

Request a Quote

SI-U04 Magnetic Float Level Sensor-Reed Switch

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Magnetic Float Level Switches & Sensors with Magnetic Reed Switches for Continuous Level Measurement.

Magnetic Float Level Sensor works with Reed Switch, is a continuous level sensor. SI-U04 Magnetic Float Level Sensor-Reed operatess on a direct, simple principle. As the magnetic float rises and falls as liquid levels change. The magnetic field generated from the inside of the float drives the sealed reed switch installed in the stem. The stem is made of non-magnetic metal or strong engineering plastic. Magnetic Float Level Sensor gets the liquid level signal, transfers it into digital current signal and switching signal. Generally speaking, there are two structures of magnetic floats. Besides, the Magnetic Float Level Sensor supports multiple mounting methods. Such as top-mounted, side-mounted. So SI-U04 Magnetic Float Level Sensor can be applied to a variety of tank level measurements.

Please feel free to contact us for Technical Support, or Request a quote for float level sensors (customization available).

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More Float Level Sensors

Features of Magnetic Float Level Sensor

  • Simple structure, stable and reliable, good repeatability;
  • Realize the connection measurement of the liquid level
  • Not affected by the physical and chemical state of the measured medium. Such as: the effects of conductivity, dielectric constant, foam, pressure, temperature, evaporation, boiling, and bubbles;
  • Use different materials, which can be used in various strong and weak corrosion, flammable and explosive, toxic, strong radioactive, and foul media environments;
  • Liquid level measurement or interface measurement of two different density media;
  • Explosion-proof structure design, suitable for use in explosive environments.
  • Two-wire 4-20mA current output, with 0.56 “LED digital display, convenient for long-distance observation at night.

Applications of Magnetic Float Level Sensor

Industries:

  • Marine (commercial ships)
  • Petrochemical
  • Food/beverage
  • Water/wastewater
  • Chemical and textile industry
  • Dyeing and finishing
  • Level control in shipping industry

Applications:

Any liquids including water, oil, and chemicals：

  • Diesel or Lube Oils
  • Vegetable Oils
  • Petroleum products
  • Water, Wastewater
  • Acids
  • Caustics
  • Fuels

Specifications of SI-U04 Magnetic Float Level Sensor-Reed Switch

Measuring    range       200~6000mm(>6M customize)
Resolution factor  10mm,5mm,20mm
signal output 4~20mA(two-line)2000/m(1/2″,3/8″)
Loading resistance500Ω
Transmitting   >1000m
Working power supply  16~30VDC
Density      ≥0.5g/cm3
PressurePN2.5~PN160(×0.1MPa)(Max pressure PN320)
Operating temperature  -40 ~ 80 °C, ≤120 °C, ≤150 °C
Float ball diameterΦ30~Φ120(depending on pressure and density)
Flange installationDN40~DN150/RF/PL(HG/T20592~2009) customize2” thread(downward install)1/2” thread (upward install, resistance   signal output) 3/8” thread(upward install, resistance signal output)
Installation angle≤±25°
Electrical connection M20×1.5 female thread three-lines screening cable
IP gradeIP65
Explosion-proof gradeExia II CT6Ga,EXd IICT6Gb

Extended reading: Food grade flow meters for Food & Beverage industry

Operation Principle of Magnetic Float Level Sensor

Magnetic Float Level Sensor is composed of a reed switch, a precision resistor and a single-chip microcomputer circuit. When the magnetic force line of the magnetic float acts on a certain position of the liquid level gauge, the reed switch in that position is closed. The magnetic float follows the level change of the liquid level (interface). Linear 4 ~ 20 mADC signal output and relay contact output. Realize the detection, transmission and alarm control of the liquid (boundary) surface position signal.
The magnetic float level sensor uses imported high-quality sensing elements and signal conversion devices, which has excellent long-term stability and reliability.

Types of Magnetic Float

Magnetic floating ball (column type)
 1.фmm (321, 316L stainless steel)
2.ф40mm (4 fluorine on stainless steel)
3.ф50mm (PVC, PP)
Note: The specification is the diameter of the floating ball, and the length depends on the density of the medium.

Magnetic floating ball (through the core)
 ф76 × ф21 × 76
ф51 × ф15 × 51
ф28 × ф10 × 28
ф63 × ф25 × L (mm) is made of PVC and PP. L is determined by the density of the medium, and the diameter can be made according to user requirements.

Other types of Continuous magnetic float level switches

SI-U01 Float Level Sensor
SI-U02 Multi-Point Liquid Level Float Switch
SI-U03 Float Switch Water Level Controller

Q&A

Float level sensors are continuous level sensors featuring a magnetic float that rises and falls as liquid levels change. The movement of the float creates a magnetic field that actuates a hermetically sealed reed switch located in the stem of the level sensor, triggering the switch to open or close.
Float level sensor is composed of float, plunger and so on. The float level sensor is installed on the top of the container through the connection flange. The float floats on the liquid surface according to the principle of discharging the liquid volume phase and so on. When the liquid level of the container changes, the float also moves up and down. Due to the magnetic effect, the reed of the ball level sensor is magnetically attracted to change the position of the liquid level into an electrical signal. The actual position of the liquid is displayed digitally by a display instrument. The floating ball level gauge achieves long-range detection and control of the liquid level.

Learn more on Wikipedia

A magnetic float switch is a magnet fixed in a floating ball in the middle. Put the magnetic float on a stainless steel rod. Place a magnetic element (usually a reed switch) inside a rusty steel rod. When the levitation ball moves on a stainless steel rod, the magnetic elements will attract and break.

  • The purpose of a float switch is to open or close a circuit as the level of a liquid rises or falls. Most float switches are “normally closed,” meaning the two wires coming from the top of the switch complete a circuit when the float is at its low point, resting on its bottom clip or stop (for example, when a tank is dry).
  • Most float switches utilize a magnetic reed switch to open or close the circuit. The reed is encased in a glass tube, which is cemented into a plastic or stainless steel stem with epoxy. The illustration to the left demonstrates how a magnet can be used to open or close a circuit by moving it closer to or farther away from a reed switch. When the magnet comes close to the two contacts, they draw together and touch, allowing current to pass through. When the magnet is moved away, the contacts demagnetize and separate, breaking the circuit.
  • In a float switch, the magnetic reed switch is hermetically sealed in a stem, most often made from plastic or stainless steel. The float encases a sealed magnet, which moves up and down the length of the stem as a fluid level rises and falls.
  • As the magnet passes by the contacts in the encased reed switch, they draw together and complete a circuit between the two lead wires, as shown in the cutaway to the left.
  • The operation shown can usually be reversed by removing the bottom clip from the switch, inverting the float and replacing the clip. When this change is made, the switch circuit will be open when the float is resting on the bottom clip and closed when the float rises.
  • Properly used, float switches can deliver millions of on/off cycles, for years of dependable operation. Failures are normally due to overloading, frequently caused by spiking voltage.

Liquid level switch, also known as water level switch, liquid level sensor. Liquid level switch is used to control the liquid level switch. It is mainly divided into contact type and non-contact type. Capacitive liquid level switches are commonly used in non-contact switches, and contact float type liquid level switches are most widely used. Electrode level switches, electronic level switches, and capacitive level switches can also be implemented using contact methods.

Technical Support

Level Senors for Tank Level Measurement
SI-100 Magnetostrictive Level Sensor
SI-LT Magnetostrictive level transmitter with Local Digital Display

Magnetic float level sensor manufacturer

The float level sensor is a fully customized product. Different measurement needs will cause price changes. So before determining the price of the float level sensor, we need to confirm:
1. Junction box style

  1. Connection method
  2. Probe diameter
  3. Float distance
  4. Probe length
  5. Material selection

Sino-Instrument is float level sensor manufacturer. On the premise of ensuring product quality, we offer you the best price.


Sino-Instrument offers over 10 level transmitters for level measurement.

About 50% of these are liquid level meters, 40% is the tank level sensor.

A wide variety of level meters options are available to you,

such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of level measurement instrumentation, located in China.

Request a Quote

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SI-U03 Float Switch Water Level Controller

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Float Switch Water Level Controller for Continuous Liquid Level (interface) Measurement and Automatic Control. Explosion-proof and water proof.

SI-U03 Float Switch Water Level Controller

Float switches, also known as float level switches. Float Switch Water Level Controller is mechanical water level indicators that depend on moving parts to trigger a switch.

Float switch water level controller can be directly installed on various tank equipment (water tank). Float switch water level controller is especially suitable for hot heavy oil in oil refinery (temperature ≤500 ℃, pressure ≤4.0MPa). Viscous and dirty media, asphalt, grease and other oil products. As well as flammable, explosive, corrosive and other media’s Liquid level (interface) continuous measurement and automatic control.

Please feel free to contact us for Techinical Support, or Request a quote for float level sensors (customization available).

CONTACT US
More Float Level Sensors

Float Switch Water Level Controller Features

  • It can be installed horizontally on the side wall of the barrel, or vertically on the top of the barrel;
  • The structure is simple and reasonable, the performance is stable and reliable, and the installation is convenient;
  • Both 220VAC and 24VDC circuits can be used;
  • The control part is completely isolated from the measured liquid medium, which can be applied to high temperature and high pressure environment;
  • A variety of materials (SUS304, SUS316, PP), a variety of connection methods can meet environmental needs;
  • Lightweight (compact type) and long working life.
  • Suitable for various tank installations.
  • Suitable for viscous dirty media;
  • Available in explosion proof and non-explosion proof

Specifications of SI-U03 Float Switch Water Level Controller

TypeSI-U03-ASI-U03-BSI-U03-C
Protection leveldIIBT4dIIBT4dIIBT4
Pressure1.0 MPa1.0 MPa1.0 MPa
Tenperature(℃)Normal：≤100℃ 
High Temperature：≤350℃
Net weight1.5～2.0Kg
Switching difference(mm)≤825～5508～1000
Setting methodNot adjustable Stepwise adjustableStepless adjustable
Installation formHorizontalHorizontalVertical
Power supply and contact capacity and lifeAC：220V/1.5A、110V/2.5A
DC：24V/2.5A、240V/0.5A 
Life：5×100^2

Know more about: Guide for Liquid level float switches

How to install float switch in water storage tank?

  1. The flange of SI-U03 series electric float liquid level transmitter is installed on the side wall of the medium tank.
  2. Before installation, it should be considered in combination with the structural characteristics of the transmitter. It is convenient to operate, observe and maintain to determine the installation position and direction. If the floating ball transmitter is installed on the left side of the flange, it is installed on the left side, otherwise it is installed on the right side.
  3. Assume that the current state is the right installation. If you want to change to the left installation, use the HART Communicator to move or set the transmitter’s zero position and range.
  4. And (PV range), follow the prompts on the HART communicator display to enter URV (upper range value). LRV (lower range value). And display USL (upper sensor limit)With LSL (Low Sensor Limit). Reset the lower range value corresponding to 4mA and the upper value corresponding to 20mA and send it. If other parameters are not changed, you can change to the left installation.
  5. Floating ball and club installation: First, the floating ball and the club are tightened and welded. For the club installation operation of the new connection structure of SI-U03-A small-angle floating ball liquid level transmitter, the club is installed. Screw into the inner screw hole of the connecting rod at the end of the protective rod sleeve.
  6. Pay attention to tighten the top wires on both sides of the connecting rod into the annular grooves on the club. And then tighten the lock nuts on the top wire. For SI-U03-B large-angle floating ball liquid level transmitter, screw the ball into the inner screw hole at the end of the swing arm. And then tighten the top wire and lock nut on it in the same way.
  7. Note: “If the site conditions are poor, in order to prevent the floating ball, club, swing arm and other connecting parts from loosening. It is recommended to place the top wire and the lock nut on the joint and tighten the float and the club After welding directly to the coupling. “
  8. The transmitter is directly installed on the flange of the side wall of the medium container under test through a flange. The requirements for the straight pipe section of the connection flange are as follows: SI-U03-A L ≤ 160mm;
  9. The transmitter head is connected to the radiator through the connection plate. When installing, insert the spindle head into the coupling hole of the transmitter head, and the coupling should not be distorted. The meter head can be installed on the left or right side.
  10. For correct installation, please refer to the indicator dial on the back of the transmitter case. If the transmitter is installed on the left, turn the end pointer behind the meter head to the “left 0” scale. If the transmitter is installed on the right side, turn the pointer on the back of the meter to the “right 0” scale line. And when the float is moved to the lowest measurement position, tighten the set screw of the coupling and the spindle.
  11. Install the balance rod (mechanism) into the dental insert and square hole. Tighten the top wire to fix the balance rod. Loosen the shaft nut and adjust the dental insert to make the balance rod and the ball in the same plane. And put the axial head nut.
  12. Tighten the position of the balance weight and adjust the balance weight to the optimal state to fix the balance weight. Note: “For liquids of different densities due to the different buoyancy forces experienced by the float, the balance can be adjusted. The position of the hammer on the balance bar to achieve the goal of normal measurement. “
  13. In the process of adjusting the balance weight, when the feel is light, you can adjust the two M10 compression bolts of the waist-shaped compression sleeve inside the radiator to tighten the expansion force of the sealing gasket. Otherwise, you can adjust the waist-shaped compression sleeve when the feel is light Two M10 bolts loosen the expansion of the gasket until it does not leak!

How does a float switch water level controller work?

The float ball level switch structure is mainly designed and produced based on the principles of buoyancy and static magnetic fields. The position of the floating ball with a magnet (floating ball for short) in the measured medium is affected by buoyancy. The change of the liquid level causes the position of the magnetic float to change. The magnet in the float and the sensor (reed switch) function to generate a switching signal.

Similar to the principle of the float level sensor. But the float level sensor outputs a quasi-continuous electrical signal, while the float level switch outputs a discrete switching signal.

Water Tank Level Controller

Water level controller refers to the control of high and low water levels by mechanical or electronic methods. It can control solenoid valves, water pumps, etc., and become water level automatic controllers or water level alarms. To achieve semi-automation or full automation.

Water level control is generally used for high-level tank water supply and sump drainage. The device that converts the water level signal into an electrical signal to control the start and stop of the water pump is called a water (liquid) level controller.

Commonly used water (liquid) level controllers include reed switch water level controllers, float magnetic switch liquid level controllers, electrode type water level controllers, pressure type water level controllers, etc.

Read more about: Types of water level controllers

Water Level Sensors for Water Tanks

Water level transducers are also called Water Level Sensors, or water level transmitters. Water level transducers are used to monitor water usage and quality. The water level signal is output through 4-20mA and other signals, which is convenient for people to monitor the water level.

There are many types of water level transducers. Common ones are input type, ultrasonic, radar and so on.

Sino-Inst offer a wide range of solutions with various pressure ranges, cable lengths and output options.

For remote monitoring and recording of water level data in groundwater pumping and sludge testing, stormwater flood analysis and runoff, and surface water irrigation canals, streams and river measurements.

Read more about: Types Of Water Level Sensors

Water Tank Level Control System

Water level control refers to the control of high and low water levels by mechanical or electronic methods. It can control solenoid valves, water pumps, etc. to become an automatic water level controller or water level alarm, thereby realizing semi-automation or full automation.

Water level control is generally used for high-level tank water supply and sump drainage. The device that converts the water level signal into an electrical signal to control the start and stop of the water pump is called a water (liquid) level controller. Commonly used water (liquid) level controllers include reed switch water level controllers, float magnetic switch liquid level controllers, electrode type water level controllers, pressure type water level controllers, etc.

Read more about: Water tank level sensor system

Generally, we can monitor the liquid level of the water tank remotely. You can choose wired or wireless remote monitoring.

Wired remote transmission, generally the output signal of the liquid level sensor. Such as 4-20mA, RS485 and so on. Through the signal line, the liquid level information can be displayed remotely.

Wireless remote transmission, generally a liquid level sensor through a wireless signal. The use of LORA debugging method and NB-IoT communication method can greatly increase the communication distance. It can be widely used in the field of short-distance Internet of Things wireless communication in various occasions. Real-time monitoring of on-site liquid level data, alarm processing, statistical analysis and other functions.

The appropriate remote water tank level sensor can be configured according to the actual needs of users.

Read more about: Wireless Level Sensor – LoRa

The principles of liquid level sensors may vary, and their applications vary widely. Electronic or mechanical, remote or on-site display, contact or non-contact, it’s dizzying.

In addition to the way of connecting the measured container to visually display the liquid level, the mechanical liquid level gauge is used. Another way to measure is to use the buoyancy of the liquid surface. So that the buoy or float can follow the change of the liquid level, which is converted into the display of the liquid level. These two methods are simple though. But very stable and reliable.

The biggest feature of the mechanical level gauge compared to its electronic level gauge is that the internal structure is very simple and the counting is intuitive. A variety of materials are available, which can achieve anti-corrosion and explosion-proof, and can adapt to various installation environments.

Magnetic flap level gauge, glass tube level gauge, glass plate level gauge, float level gauge, etc. These are the most widely used mechanical liquid level display instruments on the market. They are widely used in petroleum, metallurgy, chemical, paper and other industries.

What about electronic? Generally speaking, the ones that need power supply are basically electronic. Float, capacitive, radar, ultrasonic, remote magnetic flap including liquid level transmitter and so on.

It’s easy to tell them apart, whether it’s powered internally or externally, whether it’s 24V or 220V. In short, the electronic must be powered to work.

Unlike the mechanical type, the working principle of the electronic level gauge is varied. For example, the radar level gauge uses microwaves, the magnetostrictive level gauge uses current pulses, the static pressure type uses the pressure generated at the bottom of the measured medium, and the ultrasonic level gauge uses ultrasonic waves to measure the liquid level.

High precision, easy installation, and adaptability to various installation environments are the characteristics of electronic liquid level display instruments. Compared with the mechanical type, they have a higher level of technology, but at the same time, the price is much higher than the mechanical type.

External Tank Level Indicator refers to an externally mounted level sensor. It is used to install on the outside of the liquid storage tank to measure the liquid level of the tank. When measuring with External Tank Level Indicator, install the ultrasonic probe just below the outer wall (bottom) of the container under test. No need to cut holes, easy to install. Does not affect on-site production. It can realize accurate measurement of various toxic substances and various pure liquids in high temperature and high pressure airtight containers.

Read more about: No Holes – No Damage The Tank – External Tank Level Indicator

Frequently
Asked
Questions

Help Center

The Float water level sensor uses a float to track the rise and fall of the water level, and directly drives the record in a mechanical way. The use of the float water level sensor requires logging equipment (including the water inlet pipe), which is suitable for the low sandy river section with stable bank slope and little river bed erosion. The float water level sensor is widely used in China.

The price of the water level float switch is mainly determined by some parameters:
structure type;
Wetted material
Pressure Level;
Flange specifications
Explosion-proof type
temperature;
Measuring range;
Insertion length
Medium density
Other contents such as density, operating temperature, operating pressure, electrical interface, etc., must be specified in the specification so that we can use them as reference data when designing the output.

Water level float switch is generally used for high level water tank water supply and sewage tank drainage. The device that converts the water level signal into an electrical signal to control the start and stop of the pump is called a water (liquid) level controller. Common water (liquid) level controllers include:Reed switch water level controllers. Float magnetic switch liquid level controllers. Electrode type water level controllers. Pressure type water level controllers, etc.

Liquid level controller refers to the control of high and low liquid level by mechanical or electronic methods. It can control solenoid valves, water pumps, etc. to achieve semi-automatic or full automation. There are many methods, depending on the choice of different products different.

Extended reading: Capacitive water level sensor

Notes on installation and adjustment of float level switch:

The float level switch only needs to re-calibrate the water level line before we install it. The switch itself cannot be adjusted. At this time, use a multimeter to measure the switch state. It will be turned on and off with the water level near the water line, which means that there is no problem.

Just make sure that the water level line of the thermal equipment is consistent during the installation. For example, the liquid level switch of SOR is usually attached to the water level line on the wall of the cylinder. We soak the switch in the water tank and slowly sink to make the water surface gradually approach the marking line. When you get closest, you will hear the micro switch the sound of.

Note that:
High-temperature liquid level switches, etc. have high operating temperatures and high water temperatures. The density of hot water is lower than the density of room temperature water, so the action line of room temperature water is lower than the switch marking line. Low level alarm is connected to normally closed (NC), high level is connected to normally open (NO). This type of switch is not difficult to install. The liquid level switch itself will have more than two pairs of micro-switches, which respectively output two pairs of normally open and two pairs of normally closed contacts, which are usually “on alarm” when applied.

Control the high and low water levels by mechanical or electronic methods. It can control solenoid valves, water pumps, etc. to become an automatic water level controller or a water level alarm, thereby realizing semi-automation or full automation.

Liquid level switch is a general term. There are many types of level switches. Such as ultrasonic liquid level switch, electrode liquid level switch, capacitive liquid level switch, etc. The float level switch is also one of them.

The float level switch is a controller used to control the detection and control of the water level.

The float level switch is a liquid level control part with a simple structure and convenient use. It has no complicated circuits and will not be disturbed. As long as the material is selected correctly, any liquid, pressure and temperature can be used.

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Sino-Inst offers over 10 Float Switch Water Level Controllers for level measurement. About 50% of these are liquid Float Switch Water Level Controllers, 40% is the tank level sensor.

A wide variety of Float Switch Water Level Controllers options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of level measurement instrumentation, located in China.

Request a Quote

SI-U02 Multi Level Float Switch

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Multi level float switch is also called multi point level switch. Support 1-4 liquid level measurement switch point customization.

Multi level float switch is a custom multi point float level sensor & switch. These versatile level switches are available in many materials. Like: Stainless Steel, Brass & Buna, PVC, Polypropylene or PTFE and can be ordered with an integrated temperature sensor. Use these multi-level float switches with a tank level alarm or liquid level control relay for a turnkey solution. Explosion-proof available.

Call us now to talk with a sales engineer or fill out our easy to use request for quote form by following the steps below.

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Features of SI-U02 Multi Level Float Switch

  • Can be used for multi-point control. The position of the control switch can be customized according to user needs.
  • No power is required to use the reed switch, and the life of the contact can reach 2 million times.
  • All the switch outlets are in the same junction box, and the external construction wiring cost is low.
  • Compared with other types of liquid level switches with multiple switch control points, the RF unit has the lowest unit price.
  • The protection level of the junction box is above IP-65.
  • It is made of PP and SUS316 metal, so regardless of acid and alkali liquid, solvent or various fuels, there are suitable products for use.
  • The magnetic reed switch is completely isolated from the wires and liquid. So it can be used safely on high temperature and high voltage equipment.
  • Connecting rod type float level switch set, suitable for high temperature and high pressure occasions.
  • 60VA dry contact reed switch, can choose normally open or normally closed by floating ball installation position.
  • 316 SS float, conduit and mounting interface, suitable for harsh environment.
  • American standard (NEMA 4X) polypropylene housing with rotatable base for electrical centering adjustment.
  • Customizable catheter length and switch set point size.

Specifications of SI-U02 Multi Level Float Switch

  • PP and PVDF materials are suitable for strong acid and alkali places; SUS304 / 316 metal materials are suitable for high temperature and high pressure tank
  • The most complete specifications of the junction box, including plastic, aluminum alloy, stainless steel explosion-proof type, protection level IP-65 or higher
  • Contact capacity 50W / 250VAC SPST or 40W / 250VAC SPDT
  • Connection flanges have JIS, DIN, ANSI specifications; teeth have NPT, PF, BSP and other specifications
  • Multi-point control, easy installation and cost saving
  • Length: 7.6Cm to 2.4m
  • Accuracy: ± 3mm
  • Repeatability: ± 1mm
  • Specific gravity: minimum 0.55
  • Installation position: vertical installation ± 30 degrees
  • Switch set point: 1-5 (factory setting)
  • Contact type: SPST reed
  • Contact capacity: 240VAC / VDC @ 60VA
  • Electric shock output: normally open
  • Working temperature: -40 degrees to 200 degrees
  • Ambient temperature: -40 degrees to 60 degrees
  • Installation height: 13.2Cm
  • Pressure: 13.8bar
  • Protection level: IP65
  • Housing material: PP.UL94VO
  • Terminal strip: 12 posts, socket
  • Electrical interface: 1/2 ”NPT
  • Installation interface: 2 “NPT
  • Grade: Universal
  • Certification: CE
  • Special specifications can be customized according to customer needs

Extended reading: Ultrasonic Level Switch-External Mounted

SI-U02 Multi Level Float Switch Types

In order to adapt to different measuring liquids, customers can choose different wetted materials.

TypesWetted materialOperating temperatureWorking pressure
Standard typeStainless steel 1Cr18Ni9Ti, 304SS, 316L-30 ~ 120 ℃≤2.5MPa
AnticorrosivePolypropylene PP-30 ~ 80 ℃ ≤0.4MPa
Corrosion-resistantTeflon PTFE/PVC-30 ~ 160 ℃ ≤1.0MPa

How does a float level switch work ?

The Multi-Point Liquid Level Float Switch operates magnetically, without mechanical connections. And it is simple and reliable.

When the floating ball switch measures the floating medium of the test medium, the float moves the main body. And at the same time, the magnet on the other end of the float will control the magnet on the switch operating lever.

Set one or more reed switches in a closed metal or plastic tube. And then pass the tube through one or more, hollow and floating ring with ring magnet inside. And use the fixed ring to control the floating ball and the magnetic spring.

The switch is in the relevant position, which makes the float float up and down within a certain range. The magnet in the float is used to attract the contacts of the reed switch, which generates the opening and closing action.

More about: Float level sensor working principle

Applications of Multi-Point Liquid Level Float Switch

The Multi-Point Liquid Level Float Switch is suitable for:Control the pump operation to maintain the liquid level. Control the automatic loading and unloading of the tank. Control the liquid level or supply signals. Such as oil tanks, automatic cleaning systems, hydraulic tanks, low-pressure boilers, sewage treatment systems.

  • Shipbuilding Industry
  • Generator Facilities
  • Petrochemical Industry
  • Food/Beverage Industry
  • Waste Water/Water Purified Facilities
  • Electronic Industry
  • Dyeing and Finishing Industry
  • Chemical Industry
  • Rubber/ Plastic Industry
  • Hydraulic.

SI-U02 Multi Level Float Switch Dimension

Installation Precautions

  1. Multi-core cables are recommended for wiring. The load of the controlled line must match the contact capacity of the float switch.
  2. The installation position should be far from the water inlet, otherwise the switch will cause malfunction due to the fluctuation of the water inlet.
  3. If the switch device is on the wall of the container, an L-shaped steel bracket can be added.
  4. When the float switch is used in a circuit with an inductive load such as a motor, relay, solenoid coil, etc., it is recommended to protect the circuit in parallel at both ends of the load such as: RC (buffer), rheostat, diode, etc.
  5. After the wiring is completed, please tighten the box cover and fix the connection port to ensure the junction box is waterproof.
  6. The identification numbers on the terminal block of the terminal board correspond to the contacts of the floating balls from top to bottom.

More Featured liquid Level Sensors and Switches

SI-U01 Float Level Sensor
SI-U03 Float Switch Water Level Controller
SI-U04 Magnetic Float Level Sensor-Reed Switch
SI-U05 Cable Float Level Sensor & Swtich
LD series Rigid Probe Magnetostrictive Level Transmitter
LR series Integral flange Magnetostrictive level sensor
LT series Digital Display Magnetostrictive liquid level sensor
Portable Ultrasonic Liquid Level Indicator
HS-ULC-Pro Ultrasonic Non-contact Liquid Level Controller
Ultrasonic Oil Level Sensor-External Paste-Truck Fuel Tank

Sino-Inst offers over 10 level transmitters for level measurement.

About 50% of these are liquid level meters, 40% is the tank level sensor.

A wide variety of level meters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of level measurement instrumentation, located in China.

Request a Quote

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SI-U01 Float Level Sensor

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Float Level Sensors with Magnetic Reed Switches for Continuous Level Measurement.

Float level sensor (float switch) is one type continuous level sensor for industrial level measurement. Float level sensor has a magnetic float that rises and falls as liquid level changes. The percentage of the liquid level, 4 ~ 20mA current and liquid level value, can be displayed on site. Applications like: water tank, fuel tank, level measurement and level control. Vertical, horizontal, and side mounted, all can be satisfied.

Please feel free to contact us for Techinical Support, or Request a quote for float level sensors (customization available).

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Level Sensors 

Description of SI-U01 Float Level Sensor

SI-U01 float level meter is composed of three parts: magnetic float, sensor and transmitter. When the magnetic float changes with the liquid level, it floats up and down along the duct. The magnetic steel inside the float attracts the reed switch at the corresponding position in the sensor. So that the total resistance (or voltage) of the sensor changes. The changed resistance (or voltage) signal is converted into a current signal of 4-20mA and output. And the upper and lower limit alarms can be set on the display to achieve the position control of the liquid level.

SI-U01 floating ball liquid level gauge consists of a liquid level sensor and an intelligent HART board (current converter). The floating ball and the liquid level change synchronously, and the reed switch is controlled to open and close. This makes the resistance in the sensor change linearly. The change of resistance is converted by the converter into 4 ~ 20mA standard current signal or superimposed HART digital signal output.

Float level sensor can also be used with paperless recorder.

Features of SI-U01 Continuous Float Level Sensor

  • Intelligent electronic components are composed of a motherboard and an LCD screen;
  • You can adjust the range and zero point by pressing the button on the spot;
  • It can use HART communicator or microcomputer to communicate with this smart meter on both sides without interrupting the output signal.
  • It is suitable for explosion-proof or inconvenient installation and disassembly of the meter. Instrument measurement, process parameters, equipment configuration, calibration, diagnostic information HART protocol access or change;
  • Two-way communication with the host in the distributed control system using the HART protocol;
  • With EEPROM, no data is lost due to power failure.
  • Simple working principle, wide applicability, safe, convenient and maintenance-free
  • Realize the connection measurement of the liquid level without being affected by the physical and chemical properties of the measured medium. Such as: temperature, pressure, conductivity, dielectric constant, etc.
  • The use of different materials can achieve the measurement of highly corrosive media
  • It can be used to measure the interface of two different density liquids.
  • Good repeatability.

Specifications of SI-U01 Float Level Sensor

Max insert depth
L=6m(>6m customize)
Max control scopeL-120mm
Min control scope50mm(<50mm customize)
Medium density>0.5g/cm3
Working pressurePN2.5~ PN160(Max pressure PN320)
Working temperature-40~80 °C, -40~120 °C, -40~150 °C (250°C customize )
Float diameterD28~D120(depending on pressure and density)
Installation typeFlange: DN40~DN150
Flange standard: HG/T20592~2009
(pressure>PN25, Flange>DN125)
G2” thread
Other method (consulting)
Maximum switch frequency<1×105
Inaccuracy±8±2mm
Working power supply220VAC/380VAC
Max voltage of switch<250VAC
Max current of switch5A
Installation angle< ±25°
Wiring boxM20×1.5 female thread
IP gradeIP65
Explosion-proof gradeExd II CT6Gb

Float Level Sensor Operating Principle

Float level meter is an instrument for measuring liquid level. It is widely used in the field of liquid measurement. Many industries will choose to use it for measurement equipment. Such as the petroleum, chemical, and pharmaceutical industries.

Float level sensor is designed and produced based on the principle of buoyancy and static magnetic field. The position of a floating ball with a magnet (floating ball for short) in the measured medium is affected by buoyancy.

The change of the liquid level causes the position of the magnetic float to change. The role of the magnet and sensor (reed switch) in the floating ball changes the number of components (such as fixed resistance) connected in series to the circuit.

Thereby changing the electrical quantity of the instrument circuit system. That is, changes in the position of the magnetic float cause changes in the electrical quantity. The change of the electrical quantity is detected to reflect the liquid level in the container.

The float level sensor is installed on the top of the container through a connection flange. The float ball floats on the liquid surface according to the principle of discharging the liquid volume phase and so on.

When the liquid level of the container changes, the float ball also moves up and down. The reed switch of the ball level gauge is magnetically attracted to change the position of the liquid level into an electrical signal.

The actual position of the liquid is displayed digitally by the display instrument. The floating ball level gauge can achieve long-range detection and control of the liquid level.

Applications of SI-U01 Float Level Sensor

Float level sensors provide reliable readings in a range of operating environments.

Float level sensor can be widely used for continuous measurement of the liquid level (boundary level): High temperature. High pressure. Viscous, dirty media. Asphalt, wax-containing oil products and flammable, explosive, corrosive media.

Float level sensor can be used for industrial level measurement and control of various liquid tanks. Such as: Petroleum, chemical raw material storage. Industrial processes, biochemicals, medicine, food and beverage. Tank farm management and underground storage at gas stations.

The float level sensor is also suitable for dam water level, reservoir water level monitoring and sewage treatment, etc.

Of course, for different applications, you can choose different materials.

Such as:

Plastic materials PP and PVDF, suitable for strong acid and alkali places;

The metal material is SUS304 / 316L, which is suitable for high temperature 200 ℃ and high pressure 64kg/cm2.

Float level sensor Advantages and Disadvantages

Advantages

  • Long life span, stable and reliable operation, easy installation, almost no maintenance
  • None influence of measured medium in physical and chemical state. Eg: medium electrical conductivity, dielectric constants, foam, pressure, temperature, evaporation, boiling, bubbling effect etc, .
  • Choose appropriate material can be used in a variety of bad media environment with densities ≥ 0.5G/CC ;
  • Interface measurement with two media of different density control;
  • Wide range of application. Pressures from vacuum to PN160 (special up to PN320), temperature -40~+150 ° c
  • Design, explosion-proof, suitable for explosive environments;
  • Controller can be used to control the upper and lower liquid level.

Disadvantages

  • Low accuracy.
  • The installation position is limited by the shape of the container.
  • Most float level gauges are not suitable for corrosive or hazardous liquid media.

Float level sensor for water tank & fuel tank

In water treatment, the water tank float level switch is directly related to the safety and reliability of the entire process.

In a process, there are different types such as intermediate water tank, backwash water tank, produced water tank and waste liquid tank.

The sizes of these boxes are different. The volume of the produced water and the original water tank may be larger. In these water tanks, the water tank float level switch is used for related control.

Different level switches will have different actions. However, it is not necessary to have several level switches in a large water tank.

In the water tank, there are high and low level switches. The high level switch can detect whether the water tank is full. If it is full, the water production will stop. The low level switch is used to detect the water tank Is the water sufficient? If it is not enough, no more water can be sent out.

Water tank float level switch is a working condition word. If it is a large water tank, other level gauges can also be used to solve it. Like radar level gauges, ultrasonic level gauges, etc.

Of course, our float level sensor can also be used to measure and control the level of the fuel tank.

If it is used in an oil tank, special conditions such as the type of oil and corrosiveness need to be considered.

If you need to measure the level of the fuel tank. Please contact Sino-Inst sales engineers, we will provide you with suitable products and quotations based on your actual measurement situation.

Float Level Sensor for tank liquid volume monitoring

Our Float level sensors can output liquid level signals, such as 4-20mA signal, 0-10V signal, RS485 and so on.

However, the float level transmitter alone cannot calculate the liquid volume of tanks of different sizes. It’s too complicated. A separate recorder is required to calculate it.

Therefore, the digital display volume meter can collect, display and convert the liquid level of various regular and irregular tanks in the industrial field into the corresponding tank volume. It is suitable for monitoring, controlling and collecting various process parameters.

Read more about: Water Level Monitoring Sensor/System for Sewage-Wastewater

SI-U01 Float Leve Sensor Installation

The main float level sensor installation methods are:

Top mounted; Bottom mounted; Side mounted

SI-U01 Float level sensor installation instructions:

  • The measured medium should not contain ferromagnetic impurities.
  • In order to prevent the floating ball from falling off or hitting the sealing tube at high speed during transportation, which will cause the measuring tape to come out.
  • The meter should be fixed to the bottom of the sealed tube with a clamp and the magnetic steel on top of the sealed tube before the instrument leaves the factory.
  • Before installing and using, the user should remove the clamp. Raise the floating ball to the top of the sealing tube. And then slowly move the floating ball down, and the needle should be rotated accordingly.
  • The indicator of the meter is pointer type, the indicator numbers are arranged in the direction of gel needles during full-scale measurement, and the indicators are arranged in the counter-clockwise direction during emptyness measurement.
  • The instrument is equipped with a mounting flange when it leaves the factory. The user should have a pipeline flange.
  • The installation position of the instrument is generally selected at half of the measuring range.

Float level sensor price

The float level sensor is a fully customized product. Different measurement needs will cause price changes. So before determining the price of the float level sensor, we need to confirm:
1.Junction box style

  1. Connection method
  2. Probe diameter
  3. Float distance
  4. Probe length
  5. Material selection

Sino-Inst is float level sensor manufacturer. On the premise of ensuring product quality, we will offer you the best price.

Frequently Asked Questions

Float level sensor uses magnetic float as the measuring element. Through magnetic coupling, the internal resistance of the sensor changes linearly. The smart converter converts the resistance change into a 4-20mA standard current signal. It can display the percentage of liquid level, the current of 4 ~ 20mA and the value of liquid level. Remote transmission control room can realize automatic detection, control and recording of liquid level. This instrument is suitable for petroleum, chemical, power, light industry and pharmaceutical industries, such as sewage treatment and medium level measurement in various atmospheric and pressure vessels, especially for underground tanks and tanks.

Float level sensor is composed of float, plunger and so on. The float ball level gauge is mounted on the top of the container through a connecting flange. The float floats on the liquid surface according to the principle of discharging the liquid volume phase and so on. When the liquid level of the container changes, the float also moves up and down. Due to the magnetic effect, the reed of the float level gauge is magnetically attracted and changes the liquid level position into an electrical signal. The actual position of the liquid is displayed digitally by the display instrument. The float level gauge thus achieves long-range detection and control of the liquid surface.

Liquid level switch, also known as water level switch, liquid level sensor. As the name suggests, it is a switch used to control the liquid level. It is mainly divided into contact type and non-contact type. Capacitive liquid level switches are commonly used in non-contact switches, and contact float type liquid level switches are most widely used. Electrode level switches, electronic level switches, and capacitive level switches can also be implemented using contact methods.

More about: 

Liquid level float switch technology|continuous-point level

1. Float level switch: The magnetic float of the float level switch rises or falls with the liquid level. So that the sensor detects the position of the reed switch chip in the tube, and sends a contact on / off switch signal. Because of its simple structure and economic benefits, it is widely used in the market, mainly for civilian use. But its stability is relatively poor compared to industrial-grade products.
2. Capacitive liquid level switch: After the probe is wetted, it detects the change in capacitance value and outputs a contact signal. Which has certain advantages in the measurement of slightly viscous media.
3. Electrode type liquid level switch: The electrode type liquid level switch uses the conductivity of the liquid to detect the level of the liquid. Once the measured medium touches the pole, it will conduct electricity and detect the signal. After the signal of the controller is amplified, a contact signal is output to realize the control of the liquid level.
4. The photoelectric liquid level switch: The photoelectric liquid level switch uses infrared detection, using the principle of refraction and reflection of light. The reflection or refraction of light at the interface between two different media. When the measured liquid is at a high level, the measured liquid and the photoelectric switch form an interface. When the measured liquid is at a low level, air and the photoelectric switch form another interface. These two interfaces make the photoelectric switch internal light. The intensity of the reflected light received by the receiving crystal is different, that is, it corresponds to two different switching states. Generally speaking, compared with other measuring instruments, the applicability of photoelectric switches is poor.

5. Tuning Fork Liquid Level Switch: It outputs a switch signal by detecting the change in the frequency and amplitude of the fork’s vibration, which is highly versatile. For the viscous working conditions, please consult with the manufacturer to determine the working conditions that are easy to crystallize.
6. Ultrasonic external liquid level switch: The instrument probe emits ultrasonic waves and detects its residual vibration signal in the container wall. When the liquid passes through the probe, the amplitude of this residual vibration signal will become smaller. This change is detected by the instrument After that, a switching signal is output. It is a non-contact type and is often used in high-risk situations where it is difficult to open holes on the site, but the cost is relatively expensive.
The above is an introduction to the types of common level switches in the market. For more information about level switches (level switch, level switch), level meters (level meter, level meter) and other level measuring instruments, please contact us.

Extended reading: Ultrasonic Level Switch-External Mounted

Float switch is a kind of special switch. Because it does not need power supply to provide power, it is a very simple pressure switch. Its volume is small, the material is stainless steel or plastic, and the working life is very long. It has been widely used in water treatment.
The advantage of the float switch is that it can accurately measure the water level of the liquid. So it is generally used in the liquid detection of normal pressure or pressured storage tanks for signal transmission, such as liquid level alarm. Strong. It can accept multi-point control, and its use position can be left to the customer. It does not need a power supply to ensure its environmental protection. Its life is about 2 million switches. No matter the price of the product itself or the installation cost are very affordable, the price is very high. High degree of protection. It can work under high temperature or high pressure conditions, and has high safety.

If you cannot find an answer to your question in our Float Level Sensor, you can always contact us and we will be with you shortly.

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Many people may confuse the float level sensor with the magnetostrictive level sensor. Because they look alike. But the actual working principle is different.

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Sino-Ins is a manufacturer of Float Level Sensor. We provide more than 20 types of Float Level Sensors.

Float Level Sensor uses a magnetic floating ball as a measuring element. Through magnetic coupling, the internal resistance of the sensor changes linearly. The resistance change is converted into a 4~20mA standard current signal by an intelligent converter.

Float Level Sensor on-site liquid crystal display can display the percentage of liquid level, 4~20mA current and liquid level value on site. The remote supply control room can realize automatic detection, control and recording of liquid level.

Float Level Sensors can be widely used in the continuous measurement of high temperature, high pressure, viscous, dirty media, oil products such as asphalt, wax, and liquid levels (interfaces) of flammable, explosive, corrosive and other media.

Float Level Sensors can be used for liquid level industrial measurement and control of various liquid tanks such as petroleum, chemical raw material storage, industrial process, biochemical, pharmaceutical, food and beverage, tank farm management and underground storage of gas stations.

Float Level Sensors are also suitable for dam water level, reservoir water level monitoring and sewage treatment, etc.

Sino-Inst’s Float Level Sensors, made in China, have good quality, with better prices. Our Float Level Sensors are widely used in China, India, Pakistan, USA and other countries.

Sino-Inst’s entire team is well trained, so we can ensure that each customer’s needs are met. If you need any help with your product requirements, whether it is a Float Level Sensors, level sensors, or other equipment, please give us a call .

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