Sino-Inst produces many types of tank level sensors. Whatever your media, tank depth, and profile, Sino-Inst can always provide you with the right tank level sensors.

Tank Level Senors are also called Tank level indicators, tank level gauge, tank level meters, or tank level transmitters. Specifically refer to a type of sensor that can be used to measure tank level. The measured medium can be liquid or solid powder. Such as water, hydrochloric acid, Fuel, Diesel, Gasoline, liquefied gas, liquid ammonia, flour, cement, etc.

Featured Tanks Level Sensors

Tank Level Sensors Types:

Ultrasonic fuel tank level sensor, also called non-contact fuel meter. Ultrasonic level sensor measure continuous liquid level, fluid level, or oil level.

Ultrasonic level sensors measure the distance between the transducer and the surface. Using the time required for an ultrasound pulse to travel from a transducer to the fluid surface and back (TOF).  These sensors use frequencies in the tens of kilohertz range; transit times are ~6 ms/m.  The speed of sound (340 m/s in air at 15 degrees C, 1115 fps at 60 degrees F) depends on the mixture of gases in the headspace and their temperature.

Ultrasonic sensors work without the need to touch the medium being measured. Ultrasonic sensors are ideal for difficult or corrosive liquids such as acids, wastewater, and others. Ultrasonic level sensors are also ideal for continuous level measurement. While float switches and other sensors are adept at measuring when liquid levels are above or below a certain point. The nature of ultrasonic level measurement is such that levels can be sensed and displayed in real-time.

More about Ultrasonic level measurement

Ultrasonic level transmitters use the speed of sound to calculate level

Features of Ultrasonic Tank Level Sensor

  • Non-contact – nothing touches the liquid
  • Easy to install at the top of the tank into standard fittings
  • Use indoors or outside, in metal or plastic tanks
  • Connects to other industrial equipment
  • Measures a wide variety of liquids and liquid environments
  • Accessories to display, alarm, and control liquid levels
  • Wireless option sends tank levels to a LAN or the cloud
  • MRO & OEM tank setup duplication without re-calibration

Read more about: Ultrasonic Tank Level Sensor-External Mounted

Magnetostrictive level transmitter, in-tank liquid level transmitter, is a continuous magnetic level gauge. The magnetostrictive level sensor measure the level of fluid in the vessel. By detecting the level of the magnets contained within the float and then transmits the measurement back to the control system.

Magnetostrictive liquid level transmitter is a kind of liquid level sensor. But it uses the principle of magnetostrictive operation internally. And combines modern electronic technology to measure the time value between pulse waves to achieve the purpose of accurately measuring the liquid level . The magnetostrictive liquid level meter works with waveguide pulses. During the work, the measured displacement is determined by measuring the time of the start pulse and the end pulse, so the measurement accuracy is high.

Features of Magnetostrictive Level Transmitters:

  • High Accuracy
  • High Reliability
  • No calibration required
  • No Maintenance
  • Simultaneous Measurement of Multiple Process Conditions:
    -Product Level
    -Interface Level
  • No Scheduled Maintenance or Recalibration
  • Field Repairable
  • Inherent Accuracy ±0.039” (±1 mm)
  • 200 Point Strap Table
  • API Temperature Corrected Volumes
  • Integral Display
  • Hazardous Area Certified
  • Intrinsically Safe

More about Magnetostrictive liquid level tmeasurement

Submersible level sensor, Pressure and DP level transmitter are all hydrostatic measurement devices.

Also known as pressure level transmitters, these transmitters help in determining fluid contents of a container, by measuring the pressure of the resting body of the fluid within it. The greater the force of liquid, the greater the volume of fluid.

Hydrostatic level transmitters
Extended reading: Hydrostatic Level Measurement

The pressure type liquid level gauge is a pressure sensor that measures the liquid level. Including static pressure level gauge, liquid level transmitter, pressure transmitter and so on. The measured static pressure of a liquid is proportional to the height of the liquid. And the static pressure is converted into an electrical signal. After temperature compensation and linear correction, it is converted into a standard electrical signal (4-20mA / 1 ~ 5VDC). Hydrostatic liquid level sensor is suitable for liquid level measurement of various media in systems and industries. Such as petrochemical, pharmaceutical, water supply and drainage, environmental protection and other systems. The exquisite structure, simple adjustment and flexible installation methods provide convenience to use.

Read more about: Submersible Level Transmitter-Straight Rod Insertion

The differential pressure level gauge is a meter that calculates the liquid level (differential pressure) in a tank. By measuring the pressure difference at two different points of the container. For example, a 500 mm water column corresponds to a pressure of 500 mmH20. In many applications, however, there is additional vapor pressure above the liquid. Vapor pressure is not part of the level measurement. So impulse tubes and capillaries with seals are needed to counteract its presence.Capillary columns and sealing systems solve many installation problems with impulse tubes. These systems include an external sensing diaphragm. This diaphgram connected to a differential pressure transmitter via an oil-filled capillary column. The change in pressure causes a displacement of the diaphragm. So that the pressure is transmitted to the transmitter through the oil-filled capillary. The oil-filled capillary system is carefully welded and manufactured. So it is a reliable sealing system. This type of structure eliminates leak points and blockages that may occur in the impulse tube.

More about Hydrostatic pressure level measurement

Radar level transmitter, also called Radar level gauge. Non-contact Continuous level measurement in liquids and solids with free space radar sensors. Non-contacting radar, based on microwave technology, detects only surfaces that reflect energy. These transmitters work on the principle of a radar by using radio wave emissions. Mounted at the top of a tank filled with a liquid. The transmitter sends a radar signal into the liquid, and receives a reflection of the signal. The transmitters then analyze the current fill level of the tank based on the time taken by the transmitted signal to return.

Operating Principle of Non-Contacting Radar Level Sensors/Gauges (Unguided Wave)

Operating Principle of Non-Contacting Radar Level Sensors/Gauges (Unguided Wave)

Extended reading: Radar Liquid Level Sensor|Corrosive, steam, volatile liquids

Radar Level Sensor Features

  • Non-contact, continuous level measurement over larger ranges
  • Unaffected by sludge and biomass, dust, foam, oil, grease and other coatings, uneven surfaces, turbulence, pressure, and vacuum
  • Single frequency radar level sensors for liquid sensing, dual frequency radar level sensors for level measurement of aggregates, gravel, sand, coal, asphalt, and other solids
  • Simple mounting and push-button calibration

More about Radar level measurement

Capacitance level detectors, also known as Capacitance level transmitter. RF Capacitance Level Transmitter offers continuous and point level detection. In liquids and solids with capacitance probes. These transmitters use liquid stored in a tank or container as a dielectric medium between two or more electrodes. The energy capacity of the capacitor circuit increases when there is more liquid, and decreases if there is less liquid. Measuring the variations in the capacitance value, capacitance level transmitters calculate level of the tank.

Features of SI700 RF capacitance level transmitter:

  • Capacitive level measurement enables measurement without blind spots over the entire sensor length
  • Fully insulated capacitive sensors also measure aggressive liquids
  • Cost-effective measurement for trouble-free and maintenance-free operation

More about capacitance level measurement

These gauges are the preferred replacement for the sight glasses. They are similar to float devices, but they communicate the liquid surface location magnetically.  The float, carrying a set of strong permanent magnets, rides in an auxiliary column (float chamber) attached to the vessel by means of two process connections.  This column confines the float laterally so that it is always close to the chamber’s side wall. As the float rides up and down the fluid level a magnetized shuttle or bar graph indication moves with it. Showing the position of the float and thereby providing the level indication.  The system can work only if the auxiliary column and chamber walls are made of non-magnetic material.    

Magnetic Level Gauges

Sino-Inst provides float designs optimized for the specific gravity of the fluid being measured. Whether butane, propane, oil, acid, water, or interfaces between two fluids, as well as a large selection of float materials. This means the gauges can handle high temperatures, high pressures and corrosives fluids. Oversized float chambers and high-buoyancy floats are available for applications where buildup is anticipated.

Chambers, flanges and process connections can be made from engineered plastics. such as Kynar or exotic alloys such as Hastelloy C-276.  Special chamber configurations can handle extreme conditions. Such as steam jacketing for liquid asphalt, oversized chambers for flashing applications, temperature designs for liquid nitrogen and refrigerants. Numerous metals and alloys ( titanium, Incoloy and Monel ) are available for varying combinations. Like high-temperature, high-pressure, low-specific-gravity and corrosive-fluid applications.  Magnetic level gauges can also be outfitted with magnetostrictive and guided-wave radar transmitters. This allow the gauge’s local indication to be converted into 4-20 mA outputs and digital communication. That can be sent to a controller or control system.

Float level gauge is mainly composed of magnetic float, sensor and transmitter. When the magnetic float ball changes with the liquid level and floats up and down along the catheter. The magnetic steel in the float ball attracts the reed switch at the corresponding position in the sensor. Which changes the total resistance (or voltage) of the sensor. The transmitter then converts the changed resistance (or voltage) signal into a 4-20mA current signal output.
The float ball level gauge uses a magnetic float ball as a measuring element. Which makes the resistance in the sensor change linearly through magnetic coupling. 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. The instrument is suitable for the sewage treatment of petroleum, chemical, power, light industry and pharmaceutical industries. And the measurement of the medium level in various atmospheric and pressure vessels. It is especially ideal for the liquid level measurement of underground storage tanks and storage tanks.

Float level transmitters for tank level meaurement

Features of Float level transmitters:

  • Suitable for the measurement of the liquid level and interface of the liquid medium in the container. In addition to on-site instructions, it can be equipped with remote transmitters, alarm switches and complete detection functions.
  • Innovative indication, intuitive reading, eye-catching, observing the direction of the indicator can be according to user needsChange the angle.
  • Large measuring range, not limited by the height of the storage tank.
  • The indicating mechanism is completely isolated from the measured medium, with good sealing, high reliability and safe use.
  • Simple structure, easy installation, easy maintenance, corrosion resistance, no power supply required, explosion-proof. At the lower limit, the float floats upright on the water.

Extended reading: Diesel fuel tank level gauges & indicators

After understanding these 7 types of Tank Level Senors, if you are experienced, you can purchase Tank Level Senors on the product details page. If you are new to this, then perhaps you need to continue to consider the measurement medium and monitoring requirements.

The following content is based on our many years of experience in liquid level measurement services. We at Sino-Inst have long been providing users with various tank level measurement solutions.

First, we recommend that you consider the measuring medium. For example, the most common measurement is the liquid level of water and diesel.

Water Tank Level Sensor

The water level sensor of your water tank is an essential component. If not repaired or replaced, a sensor can become damaged over time and fail entirely. Too much water can cause a malfunction and too little water means inadequate water pressure. Either way, repairing or replacing holding tanks is an expensive task you shouldn’t have to undertake because of sub-par sensors.
With Sino-Inst’s water tank level sensors, there’s nothing to break down or rust and our models have a 99% success rate!

In the high unlikely event that you experience any issues with your product, call us and we’ll replace or repair it immediately at no charge.

Read more about our water tank level sensors and control systems.

Hydrostatic pressure for Water level measurement

SI-151 Hydrostatic Level Sensor
SMT3151TR Hydrostatic level transmitter-Rod Type
SI-PCM260 Deep Well Water Level Sensor

Extended reading: Hydrostatic Pressure Transmitter

Diesel storage tanks -Explosion Proof level sensors

For diesel, gasoline, or other oils that require explosion-proof storage tanks. Liquid level measurement requires level sensors to meet explosion-proof requirements.

For example, explosion-proof ultrasonic level meter, explosion-proof radar level meter, etc.

non-contact tank level sensors

Of course, there are many cases where we need to measure chemical liquids, such as hydrochloric acid, liquid ammonia, etc.

Chemical Tank Level Measurement

Sino-Inst Tank level sensors expand the range of environments in which our sensors operate. Some common chemicals can damage or corrode sensor materials, even 316 stainless steel. Transducer elements and bonding adhesives are also susceptible. Our tank level sensors avoid these problems by using a continuous injection molded housing of Polyvinylidene fluoride (PVDF), a highly non-reactive thermoplastic that resists solvents, acids and hydrocarbons.

Tank level sensors have both top and bottom mounting threads and include a potted-in, PUR-jacketed, UV resistant cable. Verify your chemicals and operating temperatures with this compatibility chart. All ToughSonic sensors include analog, switch and data interfaces and compatible setup software, included at no charge.

Extended reading: Corrosive Liquid Chemical Level Sensor in Chemical Processing

OK. Once you know your measuring medium. Then you need to identify your monitoring needs. For example, you need to transmit the liquid level signal to the PLC system through 4-20mA.

All tank level sensors mentioned in this article can output 4-20mA.

The 4-20 mA current loop is the prevailing process control signal in many industries.It is an ideal method of transferring process information. Because the current does not change as it travels from the transmitter to receiver. It is also much simpler and cost-effective.However, voltage drops and the number of process variables,that need to be monitored can impact its cost and complexity.By knowing these fundamentals you will be able to make more informed decisions about process control in your facility. Which could affect your bottom line.

Extended reading: Industrial Tank level indicators and Tank Level Gauges

An analog signal refers to information represented by a continuously changing physical quantity. The amplitude, frequency, or phase of the signal changes continuously over time, or the characteristic amount of the representative information can be presented at any instant as a continuous time interval. Any value signal.

Sino-Inst’s tank level gauge provides multiple output modes, including analog voltage and current, digital, RS485, etc. The output signal can provide a position, multiple positions, or a position plus a temperature output. The detailed multi-function output mode provides customers with more choices.

Extended Reading: How to Measure Volume of Liquid

Continuous level sensors provide level monitoring of an entire system. They measure liquid level in a range, rather than at a single point, outputting an analog signal that correlates to the liquid level inside your tank or vessel.

Extended reading: What is a capacitive liquid level sensor?

If you do not have a monitoring system similar to a PLC, but you need to monitor the tank level in the office, you can configure our level-volume recorder.

Extended reading: GWR Solid Level Sensor-Cement silo-Ash powder measure

Featured Continuous level sensors

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

Tank Level Sensor Industries & Applications

Continuous level transmitters are versatile in monitoring liquid level needs. They can monitor water, diesel, lube oils and fuels, as well as various chemical and petrochemical liquids.

Storage tanks are widely used in the fluid industry to store raw materials, finished products, and intermediate products. They have an irreplaceable role in ensuring the safe production of equipment, energy-saving and emission reduction and improving the overall management level. National strategic reserves are also inseparable from various types of Storage tanks. 

Industrial storage tanks are generally steel storage tanks. Carbon steel, low-temperature steel, stainless steel, and other materials are selected according to the characteristics of the storage medium, storage temperature, pressure, and other parameters. Other materials such as FRP and plastic are not considered due to fire and pressure resistance.

Common liquid level sensor application tank level monitoring:

  • Chemical injection
  • Hydraulic and lube oil tanks
  • Drilling fluid (mud) tank monitoring
  • Liquid level monitoring during transfer
  • Food and Beverage
  • HVAC
  • Medical
  • Printing (Ink Handling Systems)
  • Off-Highway Vehicles
  • Semiconductor

Extended reading: Types of Fuel-Diesel Level Sensors

How Tank Level Sensors Work?

The level of the liquid medium in the container is called the liquid level. And the instrument that measures the liquid level is called the liquid level transmitter. Level transmitter is a kind of level instrument.

There are two types of level transmitters, one is continuous and the other is point-off. The continuous level transmitter is a real-time monitor of the height of the liquid in the container. The point type, which generally takes two points, high and low, and outputs an alarm signal when the medium in the container reaches these two points. The types of liquid level transmitters are very wide. Specific include magnetic flap liquid level gauge, tuning fork vibration type, differential pressure type, pressure type. Ultrasonic, magnetostrictive liquid level gauge, magnetic flap, radar, and so on.

Levels of media such as: water, viscous fluids, and fuels, or dry media such as bulk solids and powders can be measured using the transmitter.

Level measurement transmitters are used in a myriad of applications that require level measurement within containers or tanks. These transmitters often find their application in material handling, food and beverage, power, chemical, and water treatment industries.

About Level Sensor Types and how they work, OMEGA Engineering has a good explanation. Video source

Technical Support


Fluid level sensors are termed as the sensors used for detecting liquid levels or interfaces between liquids. Such as water and oil or solids and liquids. These sensors can also be defined as transducers or as integrated systems with instrumentation and control capabilities. This type of fluid level sensor is one of the most important sensors. Fluid level sensor plays a vital role in a variety of industrial and applications.

Industrial applications include fluid-level sensing in transport tanks, storage tanks and water treatment tanks. And also in the petrochemical industries for sensing liquids. Such as petrol, diesel and other fuels. Liquid level measurement is significant in household applications. Including electronic devices. Such as, water dispensers, water evaporators, steamers.

The monitoring system of boilers, heating systems. Washing machines, steam irons, juice squeezers, automated coffee machines, etc.

Fluid Level sensors are designed for specific applications compared to general applications.

Extended reading: Diesel Tank Level Monitoring System

Point level sensors are devices that detect variation in liquid levels. And the levels are based on the presence or absence of liquid media at various points in a vessel or tank. Most often, the function of point level sensors is: High level or low-level alarms. Spill-prevention sensors. Pump protection alarms. Or pump control components.

In the simplest terms, point level sensors operate in either an on or off state. And point level sensors are used to control external devices that share an on/off functionality.
Examples of liquid level sensors that can work as point-level sensors:

Fuel tank level measurement can be achieved by using fuel level sensors. These Fuel level sensors work on a hydrostatic pressure principle. By installing a sensor at the base of the fuel tank can associate the pressure created by the level of fuel above the device. And this has a direct relationship to the level by a simple calculation. This calculation can be seen by using the Impress conversion software here.

The things to consider when selecting a fuel level sensor is that the materials used are compatible with the type of fuel you have so for instance on the submersible devices you must make sure that the pressure diaphragm, O ring seals, housing material and Cable sheath are all suitable for complete submersion in the fuel.

Typically we would suggest using a PTFE or FEP cable sheath but for petrol or gasoline although a specially made Hytrel cable may be necessary.

If the installation is a screw-type fitting in the base of the tank then just the housing, O ring seal, and diaphragm are of concern. Ceramic pressure sensor or stainless steel silicon pressure sensors are fine and a stainless steel housing are recommended.

Ultrasonic Sensors are good choice for Water Level Measurement.

The water and wastewater industry has many requirements for measuring the level of water. In applications such as flumes, weirs, pipes, tanks, wells, basins, and cooling towers. Ultrasonic sensors are reliable, cost-effective instruments for these applications. In operation, the sensor is mounted over the water. To determine the distance to the water, it transmits a sound pulse that reflects from the surface of the water. And measures the time it takes for the echo to return.

Sometimes structural components, such as a small pipe, are located in the acoustic path between the ultrasonic sensor and the water. They can reflect a portion of the sound and produce a false echo that interferes with the ability of the sensor to properly detect the echo from the surface of the water. Advanced ultrasonic sensors can be adjusted to ignore these false echoes, which therefore enables them to provide accurate water level measurements.

Extended reading: Sludge flow meter for sewage treatment return activated sludge system

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.

  • Capacitance Level Transmitters
  • Hydrostatic Level Transmitters
  • Magnetic Level Transmitters
  • Radar Fill Level Transmitters
  • Ultrasonic Level Transmitter
  • Guided Microwave Level Transmitters
  • Liquid Level Transmitters

Let’s take a closer look at how different types of level transmitters work.

Read more: What is level transmitter working principle?

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

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