Floating Level Transmitters

$ 935.00$ 1,625.00

Level control float sensors and transmitters are based on the simple principle of a magnetic field triggering the closure of a reed continuous Circuit.  Magnetic float level transmitters can be applied to the chemical industry, electric power, paper making, foodstuff, environmental protection, and urban construction, etc., and used for the level measurement of sewage treatment, ground oil container, and high water tank.  With two-wire 4-20mA standard signal and local LED digital display.


Liquid Floating Level Transmitters operate on a direct, simple principle.  In most models, afloat encircling a stationary stem is equipped with powerful, permanent magnets.  As the float rises or lowers with liquid level, the magnetic field generated from within the float actuates a hermetically sealed, magnetic reed switch mounted within the stem. 

Floating level transmitters, also known as float level sensors, are devices used to measure and monitor fluid levels in tanks, vessels, and other containers. These transmitters play a crucial role in various industries such as oil and gas, chemical processing, water and wastewater treatment, and many others. In this article, we will explore float level transmitters in detail, discussing their working principle, construction, applications, advantages, and limitations.

Principle of Floating Level Transmitters

Float level transmitters operate based on the Archimedes’ principle, which states that the buoyant force acting on an object is equal to the weight of the fluid it displaces. They consist of a float that rises and falls with the fluid level, a stem or rod that connects the float to the transmitter, and a sensor or device that converts the mechanical motion of the float into an electrical signal.

The construction of a floating level transmitter varies depending on the specific application and requirements. However, the basic components remain the same. The float is typically made of a buoyant material such as stainless steel, plastic, or foam, ensuring it can accurately measure fluid levels without sinking or floating uncontrollably. The stem or rod is usually made of a sturdy and corrosion-resistant material like stainless steel, providing structural support to the float and transmitting its motion to the sensor. The sensor can be a mechanical switch, a magnet, a reed switch, or even a capacitive or ultrasonic device, depending on the desired level of accuracy and reliability.

Industries served

These transmitters find wide application in various industries. In the oil and gas sector, they are used for level monitoring in storage tanks, pipelines, and offshore platforms. Also, In chemical plants, they help regulate the levels of corrosive liquids or precise mixing processes. In addition, In water treatment facilities, they assist in maintaining water levels in reservoirs, tanks, and treatment plants. Moreover, float level transmitters are also employed in food and beverage, pharmaceutical, and power generation industries, among others.

One of the significant advantages of float level transmitters is their simplicity and reliability. They operate based on a straightforward mechanical principle and require minimal maintenance. Additionally, these transmitters can handle a wide range of fluid temperatures, pressures, and specific gravities, making them suitable for various applications. They are also highly customizable, allowing for different mounting options, materials, and output signals based on the specific requirements.

Limitations of Floating Level Transmitters

However, float level transmitters do have some limitations. Firstly, they may not be suitable for fluids with high viscosity or those prone to turbulence.  Reasoning is that this can affect the accuracy and responsiveness of the float. Secondly, since they rely on mechanical components, they are susceptible to wear and tear over time, requiring occasional calibration or replacement. Moreover, certain environmental factors such as temperature fluctuations and vibration levels can impact their performance.

In conclusion, floating level transmitters are essential devices for measuring and monitoring fluid levels in various industrial applications. Their simple yet effective design, wide range of customization options, and reliability make them an invaluable tool for numerous industries. While they do have limitations, proper selection, installation, and maintenance can ensure their accurate and long-lasting operation.

As technology continues to evolve, new advancements are being made in the field of float level transmitters. One such development is the integration of digital communication protocols, such as Modbus or HART, into float level transmitter designs. This enables seamless integration with control systems, allowing for remote monitoring and control of fluid levels.


Another notable improvement is the introduction of more robust and accurate sensors. Traditional mechanical switches and reed switches are being replaced with more sophisticated sensing technologies like capacitive or ultrasonic sensors. These sensors provide higher accuracy, improved reliability, and can handle challenging fluid conditions such as corrosive or high-temperature environments.

Furthermore, the introduction of wireless connectivity options has revolutionized the way float level transmitters are used and accessed. With wireless capabilities, these transmitters can transmit real-time data to centralized monitoring systems.  This allows enabling operators to remotely monitor and manage fluid levels from anywhere. This not only improves operational efficiency but also enhances safety by minimizing the need for manual inspections in hazardous environments.


In addition to these technological advancements, the future of float level transmitters may see the integration of advanced data analysis techniques. Artificial intelligence and machine learning algorithms can be utilized to analyze historical data.  It can also be used to predict fluid behavior, Furthermore, allowing proactive maintenance and better decision-making regarding fluid management and optimization.

Overall, the evolution of float level transmitters holds great promise for improved efficiency, accuracy, and safety in fluid level monitoring across a wide range of industries. With the continued advancements in technology, we can expect to see even more sophisticated and reliable solutions in the future.

Advantages of Floating Level Transmitters


Float level transmitters operate on a straightforward mechanical principle and are relatively simple in design, making them easy to install and maintain.


These transmitters have a long-standing track record of reliable performance, making them a trusted choice for fluid level monitoring in various applications.


Float level transmitters can handle a wide range of fluid types, temperatures, pressures, and specific gravities, making them suitable for diverse industries.


They offer flexibility in terms of mounting options, materials, and output signals, allowing for customization to meet specific application requirements.


Float level transmitters are generally cost-effective compared to more complex level measurement technologies, offering an economical solution for fluid level monitoring needs.

Disadvantages of Floating Level Transmitters

Limited to clean fluids

Float level transmitters may not be suitable for fluids with high viscosity or those prone to turbulence, as this can affect the accuracy of the float and its responsiveness.

Wear and tear

The mechanical nature of float level transmitters means that their components can experience wear and tear over time, requiring occasional calibration or replacement.

Limited measurement range

Float level transmitters have a limited measurement range, typically based on the length of the stem or rod. This means they may not be suitable for applications requiring extremely high or low fluid levels.

Environmental considerations

Factors such as temperature fluctuations, vibration levels, or the presence of corrosive substances can impact the performance and lifespan of float level transmitters.

Lack of remote monitoring

Traditional float level transmitters may not have built-in wireless connectivity options, limiting the ability to remotely monitor and control fluid levels without additional equipment.

In addition, the stem of the floating-level transmitters is made of non-magnetic metals or rugged, engineered plastics.  When mounted vertically, this basic design provides a consistent accuracy of ±1/8 inch.  Continuous float level transmitters or sensors use a continuous sensor.

  • Simple structure principle, while extremely wide applications.
  • Continuous measurement, hence, get liquid data reliably without influence of the physical or chemical condition of the medium.  This includes, e.g. bubble/foam, conductivity rate, pressure, vacuum, temperature, evaporation, and density change.
  • Easy mounting, only necessary to calibrate before use.
  • Remote transmission signal.
  • Good repeatability; Furthermore, can measure interface, density difference ≥ 50Kg/m3.
  • Temperature range: -80~100℃
  • Vacuum pressure up to10Kpa
  • Density ≥ 400Kg/m3
  • Strong anti-corrosion ability, applied for various industries: chemical, petrochemical, natural gas, pharmaceuticals, offshore exploration, shipbuilding, power generation,
    the propulsion system, machinery, water purification installation, beverage, and food industry.

If the Floating Level Transmitters do not meet your application needs, pls visit Non-Contact and Guided Radar Level Transmitters, Pressure Level Transmitters and Ultrasonic Level transmitters.


Additional information

Weight 12 lbs
Dimensions 00 × 12 × 12 in

24VDC, 120VAC/220VAC


Explosion Proof (Exd), Intrinsically Safe (Exia)

Connection End

Flanged, NPT, Triclamp


Yes, No


4-20MA, SPDT

Communication Protocol



Measuring range:  300~8000mm
Accuracy:  ±1.5%FS (measuring range >1000mm)

Power supply:  24VDC(15~35V) (24V is factory default)

Power Consumption:  ≤720mW
Output:  4~20mADC two wire
Pressure:  1.6MPa, 2.5MPa, 4.0MPa, Class150, Class 300

Medium density:  0.5~2g/cm3
Medium viscosity:  ≤0.8Pas, 3Pas
Explosion proof:  Exd IIBT1~T6

Intrinsically safe: Exd IICT1~T6

Connection Flange: HG20593-97 DN100

PN1.0, 2.5, 4.0 Male flange or on request.

Enclosure: IP65


Floating Level Transmitters


Floating Level Transmitters


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